Academic literature on the topic 'Photocatalytic filter'

TiO2/SiO2 composite film was used to modify the surface of the filter media sintered by coal refuse. 2-Diazo-4,6-dinitrophenol (DDNP) wastewater was used as the response substrate to test its photocatalytic activity in new self-made photocatalytic reactor. The particle morphology and physico-chemical properties of the modified filter media were characterized by the scanning electron microscope (SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD). The influencing factors of the photocatalytic activity of the modified filter media were studied. When the modified filter media was used, the decolorization rate and COD removal rate of DDNP wastewater reached 70.00% and 60.85%, respectively. But unmodified filter media almost had no photocatalytic activity. The orthogonal experiment showed that the optimal working parameters separately were: 59:1 of Ti/Si in the TiO2/SiO2 composite film, pH 1, 7 ml L-1 H2O2, and 3000 times chroma (equivalent initial concentration of DDNP wastewater). Under the above condition, the decolorization rate and COD removal rate separately reached 98.50% and 92.50% for 1 h photocatalytic reaction. Under the condition of illumination and aeration, the photocatalytic activities were obviously higher than those under only illumination or aeration.

The paper preliminary studied the photocatalytic efficiency of the filter residue of the acidolysis of high titanium slag (RAHTS) with hydrochloric acid, and explored the photocatalytic efficiency on the acid methyl orange solution under the mercury lamp irradiation. With RAHTS performing as a raw material to react with hydrochloric acid, and then the substance content, nature and catalytic efficiency of the filter residues were examined by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and photocatalytic reaction apparatus. Through the experimental investigation, the photocatalytic degradation efficiency on the methyl orange of the filter residues increased with the acid-sludge ratio, reaction time, reaction temperature, and the concentration of hydrochloric acid. When the temperature was 100°C, the reaction time was 4 h, the concentration of the hydrochloric acid was 6 mol/L, the acid-sludge ratio was 1, the filter residues showed a best photocatalytic degradation efficiency. Under that experimental condition, the degradation rate was as high as 85.1%.

The nano-SiO2/TiO2complex film was used to implement modification of the surface on the sintered filter material of coal refuse. In the photocatalytic reactor, methyl orange was taken as the response substrate to test the photocatalytic activity and the influence of the different Si/Ti ratios of the complex film on the photocatalytic activity of modified filter material. The Langmuir-Hinshelwood dynamics model was applied to describe the dynamic process during which multiphase photocatalytic modified filter material disassembled the methyl orange. The results indicated that the initial concentration, pH value, aeration illumination condition and the Si/Ti ratios of the complex film were the major influence factors of the efficiency of photocatalytic degeneration. In the acidic environment, and on the illumination and aeration conditions, when the initial concentration of the methyl orange solution was 6mg/L and the Si/Ti ratio was 1/39, the SiO2/TiO2complex film was used to decolor the methyl orange, then the decolorization rate was over 99.8% after 2h.

The purpose of this study was to determine the effectiveness of photocatalytic ionisation as a disinfection method for filter materials contaminated by microorganisms, and to assess how air relative humidity (RH), time and microbe type influence the effectiveness of this disinfection. In the quantitative analysis of a used car air filter, bacterial contamination equalled 1.2 x 10(5) cfu/cm2, fungal contamination was 3.8 x 10(6) cfu/cm2, and the isolated microorganisms were Aspergillus niger, Bacillus megaterium, Cladosporium herbarum, Cryptococcus laurenti, Micrococcus sp., Rhodotorula glutinis and Staphylococcus cohnii. In the model experiment, three isolates (C. herbarum, R. glutinis, S. cohnii) and 3 ATCC species (A. niger, E. coli, S. aureus) were used for photocatalytic ionisation disinfection. The conditions of effective photocatalytic ionisation disinfection (R > or = 99.9%) were established as 2-3 h at RH = 77% (bacteria) and 6-24 h at RH = 53% (fungi). RH has an influence on the effectiveness of the photocatalytic disinfection process; the highest effectiveness was obtained for bacteria at RH = 77%, with results 5% higher than for RH = 49%. The studies show that the sensitivity of microorganisms to photocatalytic ionisation disinfection is ordered as follows: Gram-positive bacteria (S. cohnii, S. aureus), Gram-negative bacteria (E. coli), yeasts (R. glutinis), and moulds (C. herbarum, A. niger). Of all the mathematical models used for the description of death dynamics after photocatalytic ionisation disinfection, the Chick-Watson model is the most useful, but for more resistant microorganisms, the delayed Chick-Watson model is highly recommended. It therefore seems, that the presented disinfection method of photocatalytic ionisation can be successfully used to clean filtration materials.

Contamination of hazardous chemicals is currently considered one of the major environmental problems. The methods of purification of gaseous emissions depending on the physicochemical properties of pollutants, in particular dangerous chemical, their aggregate state, concentration in the gas environment are studied in this article. The effect of aerosol content such as dust and soot is analyzed as well as the efficiency of purification methods at different temperature intervals, methods of purification of multicomponent mixtures. The comparative characteristics of thermochemical, reagent, sorption and catalytic methods are given and the prospects of their application in filtering systems of stationary and mobile objects are evaluated. It has been proved that almost any organic compounds can be oxidized (mineralized) on the TiO2surface. In practice, any photocatalytic air purifier includes a porous TiO2 deposited carrier, which is irradiated with ultraviolet rays and through which air is purged. Photocatalysis is suitable for domestic use as it can occur at room temperature. For example, a thermocatalytic method of destroying harmful substances requires preheating the air to a temperature above 200 ° C. Photocatalysis destroys substances that penetrate even through activated carbon filters. Features of formation of oxide coatings by plasma-electrolytic oxidation of titanium alloys are considered. It is proposed to refine the design of collective defense systems on armored vehicles and stationary facilities with additional installation in the filter-absorber of the grid with the deposited layer of catalytic material, which will neutralize various types of dangerous chemicals due to photocatalytic air purification.

A number of commercially available art protection products have been compared and assessed for their suitability as UV blocking filters in the application of “visible light” photocatalytic research. Many groups claiming visible light photocatalytic success employ filters to block out stray UV radiation in order to justify that their photocatalysts are indeed visible light photocatalysts and not UV light photocatalysts. These filters come in varying degrees of ability and price and many authors fail to correctly characterise their filters in individual papers. The use of effective filters to prevent both false positive and false negative results is important to maintain scientific rigor and create accurate understanding of the subject. The optimum UV filter would have the highest UV blocking properties (<390 nm) and simultaneously the highest visible light transmission (390–750 nm). Single and double layers of each of the glass products were assessed as well as laminate products. The conclusions show an inexpensive and highly effective setup for the conduction of visible light photochemistry that should be incorporated as a standard part in any researcher’s work where the claim of visible light activity is made.

The development of high-performance air filter has become more and more important to public health. However, it has always been very challenging for developing a multifunctional air filter to simultaneously achieve excellent filtration and antibacterial properties. Herein, a versatile air filter was prepared with loading the reduced graphene (rGO) and zinc oxide on the superfine glass fibre (s-GF) with the three-dimensional network structure by in situ sol–gel process followed by calcination, which aims to achieve synergistic high-efficiency air filtration and rapid response to photocatalytic antibacterial properties under visible light. The air filter showed a three-dimensional network structure based on a rGO/ZnO/s-GF multilayer and exhibited the highest catalytic performance by achieving a 95% degradation effect on rhodamine B within 2 h and achieving 100% antibacterial inactivation of the Escherichia coli and Staphylococcus aureus within 4 h under visible light when the weight ratio of rGO in rGO/ZnO is 1.6%. The air filtration efficiency can also be maintained at 99% after loading ZnO and rGO photocatalytic particles. The spectrum of the photoluminescence (PL), UV-Vis diffuse reflectance spectra (DRS) and electron spin resonance (ESR) indicate that the combination of rGO and ZnO on the s-GF can increase the separation of photogenerated carriers and the specific surface area of the air filter, thereby increasing the photocatalytic response and antibacterial properties of the s-GF air filter under visible light in a short time.

The purpose of this research was to synthesize and form fibroin silk air filter (SF filter) coated and non-coated with titanium dioxide. For use in indoor air pollution treatment. The main air pollutant to be treated is PM2.5. However, VOC removal also investigaed in this study. The synthesis involved degumming process using 0.5 wt % Na2CO3 at 90°C for 60 minutes. Titanium dioxide (TiO2) used in the study was a catalyst Tipaque brand (code A-220 (Anatase)). Results from studying on physical property by scanning electron microscope found that silk fibre was an ununiformly arrangement structure. SF filter coated with TiO2 showed that TiO2 distributed uniformly on the filter. The silk fibroin filters were brought to analyze for the energy band gap in order to find the energy value that the catalyst was needed to stimuate reaction in the photocatalytic process. It was found that TiO2 1-7.5 %(w/v) catalyst coated on the silk fibroin filters had the highest value of light absorption at 390 nanometers, which agreed with the value of energy level in the band gap period of 3.18 eV.The results from efficiency studies of SF filters in the treatment of indoor air pollution (generated from incense fume of 0-2 micron in size) indicated that the best treatment efficiency was 99.76%. In which SF filter non-coated with TiO2 was used, and initial PM2.5 concentration was 5 mg/m3, air flow rate was 3.93 m3/min. Treatment period was 8 hours.

A ultaviolet–visible light responded photocatalytic nanocomposite, silver/silver bromide/titanium dioxide, supported on graphene oxide (GO; silver/silver bromide/titanium dioxide/GO) was fabricated via a layer intercalation method using n-butylamine, cetyltrimethyl ammonium bromide, titanium dioxide and silver/silver bromide-intercalated GO successively. The resultant silver/silver bromide/titanium dioxide/GO exhibited much stronger visible light absorption and enhanced photocatalytic efficiency than titanium dioxide/GO and titanium dioxide. Furthermore, the degradation efficiency of silver/silver bromide/titanium dioxide/GO was improved when irradiated under light without the ultaviolet cut filter. The apparent degradation rate constants, k, for silver/silver bromide/titanium dioxide/GO, titanium dioxide/GO and titanium dioxide are 0.5192, 0.2273 and 0.0627 h−1. A possible photocatalytic degradation mechanism for degradation of 4-chlorophenol by silver/silver bromide/titanium dioxide/GO under irradiation with/without the ultaviolet cut filter was proposed. The factors including the visible light response from silver bromide, surface plasmon ‘hot’ electron effect from silver nanoparticles and efficient electron transfer among silver, silver bromide, titanium dioxide and GO are contributed to enhance the photocatalytic activity under visible light irradiation, while the additional factor of ultaviolet light response from titanium dioxide plays an important role under light irradiation without the ultaviolet cut filter. The resultant silver/silver bromide/titanium dioxide/GO possessed a good photochemical stability and reusability.

La dépollution est aujourd’hui un enjeu majeur pour la protection de l’environnement et un développement durable. Les technologies membranaires et les procédés d’oxydation avancée jouent un rôle de plus en plus important dans le traitement de l'eau que ce soit pour la production d’eau potable que pour le traitement des eaux usées urbaines ou industrielles. La photocatalyse hétérogène est un procédé d’oxydation avancée permettant la génération des espèces très oxydantes comme les radicaux OH•, en présence d’eau et de dioxygène, lors de l’irradiation de certains solides semi-conducteurs au premier rang desquels on retrouve le dioxyde de titane. L’objectif final visé dans cette thèse est le développement de filtres photocatalytiques performants mis en œuvre dans des procédés hybrides couplant séparation et photodégradation. Le mode d’élaboration envisagé pour ces filtres photocatalytiques est basé sur une voie de synthèse en rupture utilisant un polymère biosourcé, la cellulose, à la fois comme réactif (source d’oxygène) et support mécanique pour la croissance de nanoparticules de TiO2 à partir de tétrachlorure de titane. La première partie de la thèse est dédiée à une revue bibliographique qui porte principalement sur les procédés membranaires et hybrides, le dioxyde de titane et ses propriétés photocatalytiques et sur les propriétés chimiques, structurales et microstructurales et l’évolution thermique de la cellulose. Après un descriptif des matériels et méthodes mis en œuvre dans l’étude expérimentale sont d’abord présentés et discutés les résultats obtenus sur la préparation et la caractérisation de poudres purement minérales, à base de TiO2, et de poudres composites TiO2-carbone. L’effet du dopage du TiO2 par différents métaux de transition afin d’améliorer ses propriétés fonctionnelles est ensuite examiné. Une simplification du procédé de synthèse consistant à éliminer tout usage de solvant est exposée dans le chapitre suivant. S’appuyant sur le savoir-faire précédemment acquis en matière de synthèse et sur les performances photocatalytiques préalablement mesurées, le dernier chapitre est consacré aux travaux préliminaires menés sur la préparation de filtres photocatalytiques et sur l’évaluation leurs performances fonctionnelles
The pollution is definitely a major issue for environmental protection and sustainable development. Membrane technologies and advanced oxidation processes play more and more a key-role in the treatment of water both for the production of drinking water and for the treatment of municipal and industrial wastewaters. Heterogeneous photocatalysis is an advanced oxidation process for generating highly oxidizing species such as OH• in the presence of water and dioxygen, under irradiation of some semiconducting solids like titania (TiO2). The targeted objective for this PhD work is the development of efficient photocatalytic filters to be implemented in hybrid processes coupling separation and photodegradation. The innovative route investigated for preparing such photocatalytic filters is based on the use of a bio-based polymer, i.e. the cellulose, both as reactant (oxygen source) and mechanical support for the growth of titania nanoparticles from titanium tetrachloride. The first part of the thesis is dedicated to a literature review mainly focused on membrane and hybrid processes, on titanium dioxide and its photocatalytic properties and on the chemical, structural, microstructural and thermal behaviour of cellulose. After a description of the experimental procedures, the second part of this manuscript is first dedicated to the presentation and the discussion of the experimental results on the preparation and characterization of pure titania powders and of TiO2-carbon composite powders. The effect of titania doping by different transition metals in order to improve its functional properties is then examined. Simplification of the synthesis process by removing any is described in the next chapter. From the previously developed know-how on synthesis and photocatalytic performance, the last chapter is devoted to preliminary work on the preparation of photocatalytic filters and on the assessment of their functional properties

O presente trabalho teve como objetivos o estudo das propriedades nanoestruturais, características morfológicas e avaliação do comportamento fotocatalítico de filmes de dióxido de titânio dopados com enxofre. Os filmes de TiO2 foram crescidos sobre borossilicato, por meio da técnica de MOCVD, na temperatura de 400 °C. O processo de dopagem com enxofre deu-se a partir do tratamento termoquímico de sulfetação, realizado sob atmosfera de H2 / 2%v. H2S, nas temperaturas de 50 °C, 100 °C e 150 °C, o que resultou em teores de S de 8 at.%, 3 at.% e 0,2 at.%, respectivamente. A degradação do corante alaranjado de metila foi utilizada para avaliar a atividade fotocatalítica dos filmes sob radiação ultravioleta e visível. Todos os filmes exibiram a formação da fase anatase, compostos por grãos bem definidos, e estrutura colunar densificada. Foi observada a formação de grupos SO42- na superfície dos filmes dopados, indicando a substituição dos íons Ti4+ pelo cátion S6+, e a formação da ligação Ti-O-S nos filmes. Os testes de degradação indicaram que os filmes de S-TiO2 apresentam atividade fotocatalítica tanto sob radiação UV, quanto em luz visível. O filme de 8 at.% S-TiO2, dopado a 50 °C, exibiu o melhor comportamento fotocatalítico, com 72,1 % de degradação do corante sob luz visível. Os resultados sugerem que a dopagem com S, além de formar uma morfologia favorável ao processo de fotocatálise, promoveu um deslocamento da absorção do TiO2 para a região do espectro visível, o que consequentemente permite a sua aplicação prática sob luz solar ou lâmpadas de luz visível.
The present work aims the study of the nanostructural properties, morphological characteristics and photocatalytic behavior evaluation of sulfur-doped titanium dioxide films. TiO2 films were grown on borosilicate by MOCVD at 400 °C. Sulfur doping process was carried out by the thermochemical treatment under H2 / 2%v. H2S atmosphere at 50 °C, 100 °C and 150 °C, which resulted in S contents of 8 at%, 3 at% and 0.2 at%, respectively. Methyl orange dye degradation was used to evaluate the photocatalytic activity of the films under UV-Vis radiation. All films exhibited the formation of the anatase phase, composed to well-defined grains, and dense columnar structure. SO42- groups were observed on the surface of all S-doped films, indicating the substitution of the Ti4+ ions by the S6+ cation, and the formation of Ti-O-S bond in the films. Degradation tests indicated that the S:TiO2 films present photocatalytic activity both under UV radiation and visible light. 8 at.% S:TiO2 film, doped at 50 °C, presented a higher photocatalytic performance, with 72.1 % of dye degradation under visible light. The results suggest that the sulfur doping, besides forming a morphology favorable to the photocatalysis process, caused a shift of the TiO2 films absorption to the visible spectrum region, which allows their practical application under sunlight or visible light bulbs.

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Os estudos de degradação do corante VAT idantreno verde oliva foram realizados empregando-se solução 5x10-5 mol L-1 do corante em meio de NaCl 0,1 mol L-1 , pH=2,0 por meio do processo fotoeletrocatalítico sobre eletrodos de filmes finos de Ti/TiO2. Após 210 min de tratamento foi obtido 100% de descoloração e 86 % de mineralização. A aplicação do método fotocatalítico nas mesmas condições experimentais leva a apenas 60% de remoção do corante, indicando que o método fotoeletrocatalítico apresenta maior eficiência que a técnica de fotocatálise. A degradação do corante ácido vermelho 8 foi investigada através de processo fotoquímico empregando irradiação UV com lâmpada germicida de 4 W e lâmpada de mercúrio de 80 W. Foi observado significativa remoção da cor, porém análises de carbono orgânico total mostraram que o processo não apresenta nenhuma mineralização da matéria orgânica. Utilizando-se lâmpada de 80 W a degradação do corante ocorre segundo reação de pseudo primeira ordem com constante de velocidade de 0,0122 min-1 . A degradação do corante vermelho 8 é mais eficiente pelo processo fotocatalítico. A oxidação fotocatalítica de solução 5x10-5 mol L-1 do corante em meio de Na2SO4 0,1 mol L-1 , pH=6,0, sobre vidro/TiO2 promoveu 100 % de remoção da cor e aproximadamente 43 % de mineralização do corante. A eficiência fotocatalítica de filmes de TiO2 suportados em substrato de vidro obtidos pelo método dip-coating foi investigada testando-se a degradação do corante ácido vermelho em filmes obtidos variando-se os parâmetros: número de etapas de recobrimento, velocidade de deposição e temperatura de calcinação. O filme que mostrou maior eficiência fotocatalítica na degradação do corante ácido vermelho 8, foi construído com 1 depósito de TiO2, velocidade de recobrimento de 50 mm/min e temperatura...
Studies of degradation of the dye VAT Indanthrene olive green were performed using solution was 5x10-5 mol L-1 dye in NaCl 0.1 mol L-1 , pH = 2.0 through the process photoelectrocatalytic thin-film electrodes Ti/TiO2. After 210min of treatment was obtained 100% discoloration and 86% of mineralization. The application of the photocatalytic the same experimental condition leads to 60% removal of dye, indicating that the method photoelectrocatalytic is more efficient than the technique of photocatalysis. The degradation of acid red dye 8 was investigated by photochemical process using irradiation with UV germicidal lamp 4W and mercury lamp of 80W. Have been observed significant removal of color, but the analysis of carbon organic total no shows mineralization of organic matter. Using 80W lamp degradation of the dye is second reaction under pseudo first order rate constant of 0.0122 min-1 . The degradation of the red dye 8 is more efficient for the photocatalytic process. The photocatalytic oxidation of solution 5x10-5 mol L-1 dye in the midst of Na2SO4 0.1 mol L-1 , pH= 6.0 on glass/TiO2 promoted 100% removal of color and approximately 43% mineralization of the dye. The efficiency of photocatalytic TiO2 films supported on glass substrate obtained by dip-coating method was investigated by testing the degradation of acid red dye in films obtained by varying the parameters: number of steps of coating, deposition rate and temperature calcination. The film showed better photocatalytic degradation of dye Acid Red 8, was built with 1 deposit TiO2, coating speed of 50 mm/min and calcination temperature of 350°C film. Under these conditions the degradation of the dye second reaction is pseudo first-order rate constant of degradation of k = 0.121 min-1 . Therefore, it is concluded that the technique of photolysis and photocatalysis can be an excellent alternative to decolorize... (Complete abstract click electronic access below)

O uso de energias renováveis como a energia solar para a produção de gás hidrogênio (H2), por meio do processo fotocatalítico da quebra da molécula de água, é uma alternativa promissora às fontes de energias convencionais. Neste contexto, a produção de filmes finos nanoestruturados de diferentes materiais é uma aplicação que pode aliar a fotocatálise e a nanotecnologia. Assim, o principal objetivo deste trabalho foi avaliar o efeito de diferentes concentrações de ácido tetracloroaurico (HAuCl4) para incorporação de nanopartículas de ouro (NPs Au) na produção de H2, a partir de filmes finos suportados em celulose bacteriana (CB), produzidos através da técnica camada por camada utilizando os polieletrólitos fracos, hidrocloreto de polialilamina (PAH) e poli(ácido acrílico) (PAA), combinados com dióxido de titânio (TiO2). Por meio das técnicas de espectroscopia de absorção molecular na região do ultravioleta e visível (UV-Vis), difração de raios X (DRX), microscopia eletrônica de varredura (MEV) e espectroscopia de infravermelho foi possível verificar a absorção da CB na região do UV, os picos em 14,6º, 16,6º e 22,6º, a superfície constituída de fibras e as bandas características da CB, respectivamente. A área superficial específica de 1,57 m2 g-1 foi encontrada para a CB. A absorção na região do UV das soluções de HAuCl4 e TiO2 foram determinadas por UV-Vis. Através da técnica de DRX, calculou-se o tamanho médio do cristalito do TiO2 que foi de ~5 nm corroborando com a microscopia eletrônica de transmissão (MET). O TiO2 também foi caracterizado por fluorescência molecular, MEV e área superficial específica. O potencial zeta foi utilizado para analisar as soluções poliméricas (PAH e PAA) e a solução de TiO2. Os filmes de diferentes concentrações de HAuCl4 (1,25 mmol L-1, 2,5 mmol L-1 e 5 mmol L-1) e com diferentes tempos de luz UV (6h, 12h, 24h, 24h, 48h e 96h) foram analisados por cromatografia gasosa (CG). Destes filmes, os que mais produziram H2 em cada concentração de HAuCl4 (c1-24 / concentração de 1,25 mmol L-1 e 24h de luz UV), (c2- 6 / concentração de 2,5 mmol L-1 e 6h de luz UV) e (c3-24 / concentração de 5 mmol L-1 e 24h de luz UV), foram caracterizados antes e depois da fotocatálise. Através do UV-Vis, foi possível observar a presença de NPs Au e TiO2 nos filmes. Por DRX, notou-se os picos da CB, do TiO2 (25,3º) e do Au (38,18º e 44,5º) nos filmes. No MEV foi possível observar que o filme (c1-24) possuia grãos de Au dispersos na matriz e a presença de Ti em toda a superfície sem aglomerações, revelando-se como um filme homogêneo comparado aos filmes (c2-6) e (c3-24). Pela técnica de MET, analisou-se a morfologia, tamanho e distribuição das NPs Au nos filmes revelando valores em escala manométrica. O filme (c1-24) apresentou menores tamanhos de NPs Au (9 nm). Área superficial específica, perfilometria, Espectroscopia de Emissão Óptica de Descarga Luminescente e Espectrometria de emissão óptica com plasma também foram analisados para avaliar o efeito das concentrações e tamanhos de NPs Au nos filmes. O filme com menor concentração de HAuCl4 (c1-24), o qual tinha NPs Au menores que em maior contato com a superfície do TiO2 produziu mais H2, foi analisado por CG para aperfeiçoar o melhor desempenho na produção de H2 variando alguns parâmetros como reutilização do filme (c1-24a) e (c1-24b), alteração de substrato (c1-24d), aumento de camadas (c1-24f) e filme sem polímeros (c1-24g). Analisando todas as variações dos parâmetros foi concluído que o filme (c1-24) produziu 29,12 μmol h-1cm2 de H2 apresentando uma melhor atividade fotocatalítica.
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Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul, FAPERGS.
The use of renewable energy such as solar energy to produce hydrogen gas (H2), through the photocatalytic process of breaking the water molecule, is a promising alternative to conventional energy sources. In this context, the production of nanostructured thin films of different materials is an application that can combine photocatalysis and nanotechnology.Thus, the main objective of this work was to evaluate the effect of different concentrations of tetrachlorouric acid (HAuCl4) for the incorporation of gold nanoparticles (Au NPs) in H2 production from thin films supported on bacterial cellulose (BC), produced through of the technique layer by layer using the weak polyelectrolytes, polyallylamine hydrochloride (PAH) and polyacrylic acid (PAA) combined with titanium dioxide (TiO2). Through the techniques of molecular absorption spectroscopy in the ultraviolet and visible (UV-Vis), X-ray diffraction (XRD), scanning electron microscopy (SEM) and infrared spectroscopy (FTIR), it was possible to verify the absorption of BC in the UV region, the peaks at 14.6º, 16.6º and 22.6º, the fiber surface and the characteristic bands of BC, respectively. The specific surface area of 1.57 m2 g-1 was found for CB. Absorption in the UV region of the HAuCl4 and TiO2 solutions were determined by UV-Vis. By means of the XRD technique, the average crystallite size of the TiO2 was calculated which was ~5 nm corroborating with transmission electron microscopy (TEM). TiO2 was also characterized by molecular fluorescence, SEM and specific surface area. The zeta potential was used to analyze the polymer solutions (PAH and PAA) and the TiO 2 solution. The films with different concentrations of HAuCl4 (1.25 mmol L-1, 2.5 mmol L-1 and 5 mmol L-1) and with different UV light times (6h, 12h, 24h, 24h, 48h and 96h) were analyzed by gas chromatography (GC). Of these films, the ones that most produced H2 at each concentration of HAuCl4 (c1-24 / concentration of 1.25 mmol L-1 and 24h of UV light), (c2-6 / concentration of 2.5 mmol L-1 and 6h of UV light) and (c3-24 / concentration of 5 mmol L-1 and 24h of UV light) were characterized before and after photocatalysis. Through the UV-Vis, it was possible to observe the presence of Au and TiO2 NPs in the films. By XRD, the peaks were noted of CB, TiO2 (25.3 °) and Au (38.18 ° and 44.5 °) in the films. In the SEM it was observed that the film (c1-24) had Au grains dispersed in the matrix and the presence of Ti on the whole surface without agglomerations, revealing as a homogeneous film compared to the films (c2-6) and (c3-24). Using the MET technique, the morphology, size and distribution of Au NPs were analyzed in the films revealing values in manometric scale. The film (c1-24) presented smaller sizes of Au NPs (9 nm). Specific surface area, perfilometry, Glow-discharge optical emission spectroscopy (GD-OES) and inductively coupled plasma (ICP-OES) were also analyzed to evaluate the effect of concentrations and sizes of Au NPs in the films.The film with lower concentration of HAuCl4 (c1-24), which had Au NPs less than in greater contact with the surface of TiO2 produced more H2, was analyzed by CG to improve the best performance in H2 production varying some parameters as reuse of the film (c1-24a) and (c1-24b), substrate change (c1-24d), increase of layers (c1-24f) and film without polymers (c1-24g). Analyzing all the variations of the parameters it was concluded that the film (c1-24) produced 29.12 μmol h-1 cm2 of H2 presenting a better photocatalytic activity.

Neste trabalho, filmes planos de polipropileno (CPP) cobertos com nanopartículas de dióxido de titânio (TiO2) foram feitos a partir da metodologia spray coating, facilmente reproduzida para a imobilização das nanopartículas de titânia nos suportes de polipropileno (PP). O tratamento superficial dos filmes CPP com plasma de nitrogênio (N2) e oxigênio (O2) foi utilizado com sucesso para a produção de polipropileno revestido com TiO2 com excelente estabilidade mecânica do revestimento, assim como atividade fotocatalítica / de autolimpeza como evidenciado pelos testes com corante cristal violeta (CV). Microscopia eletrônica de varredura (MEV) e microscopia confocal à laser de varredura (MCLV) foi utilizada para observar a morfologia de superfície / das fibras e topografia. A presença do revestimento de titânia foi confirmada por espectroscopia de emissão de raios-x com detecção dispersiva de energia (EDX). Tanto o tratamento com plasma como o carregamento significativo de revestimento de titânia resultam em maior hidrofilicidade, como observado pelas medidas de ângulo de contato estático em água. Os filmes CPP revestidos foram testados quanto à sua atividade fotocatalítica contra o corante CV. Os espectros eletrônicos no UV-vis mostraram que a eficiência da atividade fotocatalítica das amostras foi afetada pela quantidade de titânia. A fotoestabilidade do PP revestido com titânia foi medida por ressonância paramagnética eletrônica (RPE), uma vez que esta técnica é capaz de detectar pequena quantidade de radicais livres formados durante a precoce etapa de oxidação do polipropileno. Observa-se a partir das medições de RPE que o polipropileno tratado com plasma gerou as mesmas espécies de radicais livres que foram produzidas durante a radiação UV do polipropileno revestido e não-revestido. Entretanto, aumentando o número de ciclos de deposição da titânia a quantidade relativa de radicais livres diminui, sem perda de atividade fotocatalítica. Portanto, a metodologia empregada se mostrou eficiente para produzir uma superfície fotoativa/autolimpante no polipropileno revestido com dióxido de titânio, levando à diferentes aplicações neste campo, como por exemplo sistemas de filtragem de ar/água, remoção de poluentes orgânicos, produtos termoplásticos com características antibacterianas para uso doméstico e hospitalar, dispositivos de autolimpeza, entre outros.
Cast polypropylene (CPP) films were coated with titanium dioxide (TiO2) nanoparticles by na easily scaled-up spray coating methodology. The O2 and N2 plasma surface treatment of polypropylene was successfully used to produce TiO2-coated polypropylene with outstanding mechanical stability of the coating, as well as photocatalytic/self-cleaning activity toward crystal violet dye. Scanning Electron Microscopy and Confocal Scanning Laser Microscopy were used to observe surface / fibers morphology and topography. The presence of titânia coating was confirmed by X-ray Emission Spectroscopy with Energy Dispersive Detection (EDX). Titania coating results on higher hydrophilicity, as observed by measurements of static water contact angle. The CPP films were tested for their photocatalytic activity against Crystal Violet dye (CV). The UV/Vis electronic spectra showed that the photocatalytic activity efficiency of TiO2-coated CPP film was affected by both the plasma treatment and the titânia amount. The photostability of the titania coated polypropylene was measured by Electron Paramagnetic Resonance (EPR) since this technique is capable to detect tiny amount of free radicals formed during the early oxidation step of the polypropylene. It was observed from EPR measurements that the plasma treated polypropylene generated the same free radicals species that were produced during UV irradiation of the uncoated and TiO2-coated polypropylene. However, by increasing the number of deposition cycles of the titania the relative amount of free radicals decreases without loss of the photocatalytic activity. Therefore, the essayed methodology has been proved efficient to produce photoactive/selfcleaning surface of titania coated polypropylene, leading to different applications in this field, as water/air filtration systems, organic pollutant removal, hospital and domestic thermoplastic goods with antibacterial features, self-cleaning devices and others.

Orientador: Maria Valnice Boldrin
Banca: Hideko Yamanaka
Banca: Mercedes de Moraes
Banca: Jeosadaque José de Sene
Banca: Denise Alves Fungaro
Resumo: Os estudos de degradação do corante VAT idantreno verde oliva foram realizados empregando-se solução 5x10-5 mol L-1 do corante em meio de NaCl 0,1 mol L-1 , pH=2,0 por meio do processo fotoeletrocatalítico sobre eletrodos de filmes finos de Ti/TiO2. Após 210 min de tratamento foi obtido 100% de descoloração e 86 % de mineralização. A aplicação do método fotocatalítico nas mesmas condições experimentais leva a apenas 60% de remoção do corante, indicando que o método fotoeletrocatalítico apresenta maior eficiência que a técnica de fotocatálise. A degradação do corante ácido vermelho 8 foi investigada através de processo fotoquímico empregando irradiação UV com lâmpada germicida de 4 W e lâmpada de mercúrio de 80 W. Foi observado significativa remoção da cor, porém análises de carbono orgânico total mostraram que o processo não apresenta nenhuma mineralização da matéria orgânica. Utilizando-se lâmpada de 80 W a degradação do corante ocorre segundo reação de pseudo primeira ordem com constante de velocidade de 0,0122 min-1 . A degradação do corante vermelho 8 é mais eficiente pelo processo fotocatalítico. A oxidação fotocatalítica de solução 5x10-5 mol L-1 do corante em meio de Na2SO4 0,1 mol L-1 , pH=6,0, sobre vidro/TiO2 promoveu 100 % de remoção da cor e aproximadamente 43 % de mineralização do corante. A eficiência fotocatalítica de filmes de TiO2 suportados em substrato de vidro obtidos pelo método dip-coating foi investigada testando-se a degradação do corante ácido vermelho em filmes obtidos variando-se os parâmetros: número de etapas de recobrimento, velocidade de deposição e temperatura de calcinação. O filme que mostrou maior eficiência fotocatalítica na degradação do corante ácido vermelho 8, foi construído com 1 depósito de TiO2, velocidade de recobrimento de 50 mm/min e temperatura... (resumo completo, clicar acesso eletrônico abaixo)
Abstract: Studies of degradation of the dye VAT Indanthrene olive green were performed using solution was 5x10-5 mol L-1 dye in NaCl 0.1 mol L-1 , pH = 2.0 through the process photoelectrocatalytic thin-film electrodes Ti/TiO2. After 210min of treatment was obtained 100% discoloration and 86% of mineralization. The application of the photocatalytic the same experimental condition leads to 60% removal of dye, indicating that the method photoelectrocatalytic is more efficient than the technique of photocatalysis. The degradation of acid red dye 8 was investigated by photochemical process using irradiation with UV germicidal lamp 4W and mercury lamp of 80W. Have been observed significant removal of color, but the analysis of carbon organic total no shows mineralization of organic matter. Using 80W lamp degradation of the dye is second reaction under pseudo first order rate constant of 0.0122 min-1 . The degradation of the red dye 8 is more efficient for the photocatalytic process. The photocatalytic oxidation of solution 5x10-5 mol L-1 dye in the midst of Na2SO4 0.1 mol L-1 , pH= 6.0 on glass/TiO2 promoted 100% removal of color and approximately 43% mineralization of the dye. The efficiency of photocatalytic TiO2 films supported on glass substrate obtained by dip-coating method was investigated by testing the degradation of acid red dye in films obtained by varying the parameters: number of steps of coating, deposition rate and temperature calcination. The film showed better photocatalytic degradation of dye Acid Red 8, was built with 1 deposit TiO2, coating speed of 50 mm/min and calcination temperature of 350°C film. Under these conditions the degradation of the dye second reaction is pseudo first-order rate constant of degradation of k = 0.121 min-1 . Therefore, it is concluded that the technique of photolysis and photocatalysis can be an excellent alternative to decolorize... (Complete abstract click electronic access below)
Doutor

Atualmente, a nanociência e nanotecnologia são consideradas como um campo emergente onde, continuamente, as barreiras entre as disciplinas são rompidas. Seu principal foco de estudo consiste em buscar o controle estrutural ao nível molecular, arranjando os átomos de modo a se conseguir um entendimento e controle das propriedades fundamentais da matéria. Neste estudo foram propostas modificações moleculares e, consequentemente, na morfologia, propriedades ópticas e cristalinas em filmes finos de TiO2 com o objetivo de aumentar sua eficiência fotônica. Os filmes finos de TiO2 foram preparados pelo processo sol-gel avaliando a influência de diferentes ácidos e agente direcionador para a obtenção dos arranjos nanoestruturados. A seguir, os filmes que apresentaram maior eficiência fotônica foram incorporados com nanopartículas metálicas (Au, Ag, Pd e Pt) com objetivo de minimizar os processos de recombinação eletrônica do par lacuna/elétron. Das diversas rotas estudadas, os filmes finos de TiO2 preparados com ácido acético obtiveram maior eficiência fotônica devido à pouca aglomeração dos grãos de titânia, o que pode ter favorecido uma maior exposição dos sítios fotocatalíticos. A presença do agente direcionador na formulação teve pouco efeito na eficiência fotônica, possivelmente devido à maior aglomeração dos grãos nos filmes finos de TiO2. Com a adição de nanopartículas metálicas, os filmes finos de TiO2 com nanopartículas de platina e ouro apresentaram maior eficiência fotônica. A presença de hexamina nos filmes finos de TiO2 com nanopartículas metálicas teve pouca influência na eficiência fotônica, exceto com nanopartículas de platina e ouro. A melhora da eficiência fotônica, nestes casos, pode ser atribuída a uma possível diminuição da velocidade de recombinação do par lacuna/elétron. Dessa forma, com o presente trabalho pôde-se comprovar a grande influência das condições de preparação do TiO2 nas propriedades ópticas, morfológicas e na eficiência fotônica. Futuramente, com o maior entendimento do mecanismo desta influência poder-se-ão delinear de forma mais precisas a morfologia e eficiência fotônica destes filmes finos de TiO2, conforme a aplicação a qual serão destinados.
Currently, nanoscience and nanotechnology are considered an emerging field and continuously breaking the barrier among various disciplines. The main focus of study involves controlling structures at molecular level, arranging the atoms in order to achieve an understanding and controlling the fundamental properties of matter. In this study, molecular changes on the basis of morphology, optical and crystalline properties of TiO2 thin films in order to increase their photon efficiency were proposed. The TiO2 thin films were prepared by solgel process evaluating the influence of different acids and templates to obtain the nanostructured arrangements. Then, metal nanoparticles like Au, Ag, Pd and Pt were incorporated on TiO2 thin films. This incorporation might minimize the electron-hole recombination, so it could improve the photon efficiency. From the several routes studied, the TiO2 thin films prepared with acetic acid showed the best performance by the reason of low agglomeration of TiO2 grains, which favors the exposure of the photoactive sites. The presence of template in the formulation had a slightly effect on photon efficiency, possible due to the higher agglomeration of the grains on the TiO2 thin films. The addition of Pt and Au nanoparticles on TiO2 thin films showed superior photon efficiency. The TiO2 thin films with hexamine and metallic nanoparticles did not show the improvement on photon efficiency except for Pt and Au nanoparticles. On these situations, the improvement on photon efficiency is might be due to a possible decrease at the electron-hole recombinations velocity. Thus, the present work demonstrates the great influence of preparation conditions on the optical, morphological properties and the photon efficiency. In the future, with greater understanding of the mechanism of this influence, the properties of TiO2 thin films will be able tailoring depending on the application.

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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

O dióxido de titânio possui diversas aplicações tecnológicas, desde pigmento em tintas, até revestimentos funcionais. É um material resistente à degradação eletroquímica e fotoquímica. Com o aumento da produção industrial de corantes, há um aumento significativo da produção de rejeitos, sendo necessário o desenvolvimento de novas técnicas de degradação, a fim de reduzir a formação de efluentes. Dentre essas técnicas encontram-se os processos oxidativos avançados (POAs), que se baseiam na formação de radicais hidroxila para a degradação dos compostos liberados nos efluentes. A fotocatálise heterogênea utiliza um material semicondutor ativado por radiação ultra-violeta a fim de produzir os radicais hidroxila. Apesar de existirem estudos relacionados à utilização do TiO2 como fotocatalisador, há poucos dados com relação à sua aplicação na forma de filme suportado. Este trabalho teve por objetivos crescer filmes de TiO2 sobre borossilicato, por meio da técnica de deposição química de organometálicos em fase vapor, nas temperaturas de 400 e 500ºC por até 60 minutos, bem como proceder à caracterização microestrutural, morfológica e fotocatalítica desses filmes. Anatase foi a fase identificada em todos os filmes. Os filmes crescidos a 400°C apresentaram estrutura densificada, enquanto que os filmes crescidos a 500°C apresentaram estrutura colunar bem definida. A fotodegradação foi avaliada por meio da degradação do corante alaranjado de metila nos valores de pH 2,00; 7,00 e 10,00. Os resultados de degradação do corante mostraram que a maior eficiência do processo de degradação ocorre em pH = 2. Nessa condição, os melhores resultados ocorrem com o filme crescido por 30 minutos a 400°C, que apresentou 65,3% de degradação.
Titanium dioxide has many technological applications, as pigment in paints, and functional coatings. It is resistant to electrochemical and photochemical degradation. The increase of the industrial production of dyes results in a significant increase in production of wastes, which requires the development of new degradation techniques to reduce the release of effluents. Among these techniques there is the advanced oxidation process (AOP), which is based on the formation of hydroxyl radicals to the degradation of the compounds in the effluent released. The heterogeneous photocatalysis uses a semiconductor material activated by UV radiation to yield hydroxyl radicals. Although there are studies regarding the use of TiO2 as photocatalyst, there are few data related to its application in the form of supported film. The aim of this study was to grow TiO2 films on borosilicate substrate at 400 and 500°C for up to 60 minutes by using metallorganic chemical vapor deposition technique and proceed to the microstructural, morphology and photocatalytic characterization of the films. Anatase phase was identified in all films. The films grown at 400°C presented a densified structure, while the films grown at 500°C showed well defined columnar structure. The photodegradation was assessed by degradation of methyl orange dye in pH 2.00; 7.00 and 10.00. The results of dye degradation showed that the highest efficiency occurred at pH 2. In this condition, the best results occurred for the film grown for 30 minutes at 400°C and presented a degradation of 65.3%.

O ibuprofeno é um anti-inflamatório com produção anual superior a 15 mil toneladas, cuja concentração em ecossistemas aquáticos atinge a ordem de dezenas de μg L-1. A degradação desse poluente emergente e de outros fármacos por fotocatálise, utilizando a energia solar e nanopartículas de TiO2, é uma opção energeticamente barata e promissora, frente aos tratamentos de água convencionais. Contudo, o nano-TiO2 é toxico e causa perturbações nos ciclos redox dos microecossistemas, provocando diversos impactos à microbiota local. Uma forma eficaz de se evitar esse problema é a imobilização dos fotocatalisadores em filmes finos, evitando a lixiviação desse material para o meio ambiente. Neste contexto, o objetivo do presente trabalho foi a preparação, a caracterização e a aplicação de filmes finos automontados (FFAs) nanoestruturados de poli(ácido acrílico), hidrocloreto de polialilamina e TiO2 por meio da técnica camada por camada. Para tanto, utilizou-se a metodologia de superfície de resposta e o planejamento experimental para avaliar que parâmetros de deposição levariam às melhores propriedades para a aplicação na fotodegradação de ibuprofeno em meio aquoso. Os FFAs foram então caracterizados por meio de diversas técnicas instrumentais, tais como a microscopia eletrônica de varredura (MEV), a microscopia de força atômica (AFM), a espectroscopia de absorção no infravermelho (FTIR), entre outras. A solução degradada, por sua vez, foi avaliada por espectroscopia de absorção molecular na região do ultravioleta e visível (UV-Vis), espectrometria de emissão óptica com plasma indutivamente acoplado (ICP-OES) e espectrometria de massas (MS). Em geral, o FFA com as melhores propriedades foi capaz de degradar 50% do IBU. Esse FFA apresentou alta estabilidade em meio aquoso, além de manter sua atividade fotocatalítica por pelo menos três ciclos, sendo que a lixiviação de TiO2 foi menor que 0,5% em massa após a realização desses ensaios. Foi possível também demonstrar que a medida de degradação feita por MS resulta em taxas de redução de IBU maiores que as medidas por UV-Vis, chegando ao valor de 95%, pois enquanto a MS mede apenas a molécula de IBU, a resposta do UV-Vis refere-se ao cromóforo aromático que pode estar presente em subprodutos da degradação. Além disso, a fotossensibilização dos FFAs com cobre aumentou a degradação do fármaco testado para 76%. A partir desses resultados foi possível concluir que os FFAs impedem a lixiviação de fotocatalisador, mantendo a eficiência na degradação de fármacos, com taxas de remoção similares a de outros processos de tratamento avançados. Esses FFAs também podem ser reutilizados, sem a necessidade de processos de separação.
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, CAPES
Ibuprofen is an anti-inflammatory with an annual production of more than 15 thousand tons, whose concentration in aquatic ecosystems reaches the order of tens of μg L-1. The degradation of this emerging pollutant and other pharmaceuticals by photocatalysis, using solar energy and TiO2 nanoparticles, is a cheap and promising option, compared to conventional water treatments. However, nano-TiO2 is toxic and causes disturbances in the redox cycles of the micro-systems, causing several impacts to the local microbiota. An effective way to avoid this problem is the immobilization of the photocatalysts in thin films, avoiding the leaching of this material to the environment. In this context, the objective of the present work was the preparation, characterization and application of nanostructured self-assembled thin films (SATFs) of poly (acrylic acid), polyallylamine hydrochloride and TiO2 by the layer-by-layer technique. For that, the surface response methodology and design of experiments were used to evaluate which deposition parameters would lead to the best properties for the application in the photodegradation of ibuprofen in aqueous medium. The SATFs were extensively characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), infrared absorption spectroscopy (FTIR), among others. The degradation solution was evaluated by molecular absorption spectroscopy (UV-Vis) optical emission spectroscopy (ICP-OES) and mass spectrometry (MS). In general, the SATF with the best properties was able to degrade 50% of IBU. This SATF presented high stability in aqueous medium, besides maintaining its photocatalytic activity for at least three cycles, and the TiO2 leaching was less than 0.5% in mass after the accomplishment of these tests. It was also possible to demonstrate that the degradation measurement made by MS resulted in IBU reduction rates higher than those measured by UV-Vis, reaching 95%. MS measures only the IBU molecule, while the UV-Vis response refers to the aromatic chromophore, which may be present in by-products of the degradation. In addition, photosensitization of SATFs with copper increased the degradation of the drug tested to 76%. From these results, it was possible to conclude that SATFs prevent photocatalyst leaching while maintaining the efficiency of the IBU degradation, with removal rates similar to those of other advanced treatment processes. These SATFs can also be reused, without the need for separation processes.

Photocatalysis is an emerging and promising technology for indoor air purification, which has the higher reaction rate at the higher pollutant concentration and vice versa, and the toxic intermediate products were produced meantime. However, the concentration of indoor pollutant is usually very low. So how to improve the photocatalytic reaction rates in indoor contaminant levels in building and to eliminate the intermediate toxic products are the keys of commercialization of this technology. This paper immobilized the TiO2 on the active carbon and analyzed the effect of mass transfer due to the absorption of AC on the photocatalytic reaction rate. The experimental results shown that the photocatalytic reaction rate was improved for the local concentration of contaminants on the surface photocatalyst TiO2 was enhanced by adsorbent activated carbon. With the increase of air stream velocity, the photocatalytic reaction switched from mass transfer control process to photocatalytic reaction control process. The switch point was advanced for the absorption of AC comparing with TiO2 immobilized on the surface of glass. The indoor formaldehyde with low level concentration can be decomposed to the range of indoor air quality standards by the TiO2/AC filter.

Photocatalysis is an emerging and promising technology for indoor air purification. This photocatalytic oxidation (PCO) method is effective in the case of a higher pollutant concentration, but its wide application in indoor air purification is limited due to the low level of indoor air contaminants. In order to improve the removal of pollutants in indoor air, we have evaluated the photocatalytic performance over the nanosized TiO2 particles immobilized on the surface of an activated carbon (AC) filter for the removal of formaldehyde (HCHO). However the pollutant removal capacity is low at the low level of indoor HCHO over the TiO2/AC film because the predominant influence of residence time during this reaction. In order to improve the photocatalytic removal amount of formaldehyde (HCHO) in indoor air, we studied the combining effect of photocatalysis technology with a non-thermal plasma (NTP) technology on the removal of in door HCHO. Two different plasma electrode configurations, that is wire-to-plate and needle-to-plate electrode configuration, were built and the removal of HCHO was studied by experiment. The experimental results showed that the wire-to-plate electrode configuration is more effective for the HCHO removal than the needle-to-plate electrode configurations. The experimental results using wire-to-plate electrode configuration showed that the removal of HCHO can be enhanced and the removal amount of indoor HCHO can be improved by the combination of PCO and NTP and the combination of PCO and NTP showed the synergetic effect for the indoor HCHO removal. So the combination of PCO and NTP might be a good route for the practical application of photocatalytic technology in indoor air purification.

This Dredging Operations Environmental Research (DOER) technical note disseminates novel methods to monitor and reduce contaminant mobility and bioavailability in water, sediments, and soils. These method advancements are enabled by additive manufacturing (i.e., three-dimensional [3D] printing) to deploy and retrieve materials that adsorb contaminants that are traditionally applied as unbound powders. Examples of sorbents added as amendments for remediation of contaminated sediments include activated carbon, biochar, biopolymers, zeolite, and sand caps. Figure 1 provides examples of sorbent and photocatalytic particles successfully compounded and 3D printed using polylactic acid as a binder. Additional adsorptive materials may be applicable and photocatalytic materials (Friedmann et al. 2019) may be applied to degrade contaminants of concern into less hazardous forms. This technical note further describes opportunities for U.S. Army Corps of Engineers (USACE) project managers and the water and sediment resource management community to apply 3D printing of polymers containing adsorptive filler materials as a prototyping tool and as an on-site, on-demand manufacturing capability to remediate and monitor contaminants in the environment. This research was funded by DOER project 19-13, titled “3D Printed Design for Remediation and Monitoring of Dredged Material.”