Bibliographies thématiques / Titane – Recyclage / Articles de revues
Pour voir les autres types de publications sur ce sujet consultez le lien suivant : Titane – Recyclage.

Articles de revues sur le sujet « Titane – Recyclage »

Auteur : Grafiati
Publié le 15 mars 2025

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres

Choisissez une source :

Consultez les 40 meilleurs articles de revues pour votre recherche sur le sujet « Titane – Recyclage ».

À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.

Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.

Parcourez les articles de revues sur diverses disciplines et organisez correctement votre bibliographie.

1

Khare, Bishun N., Christopher P. McKay, Dale P. Cruikshank, Yasuhito Sekine, Patrick Wilhite et Tomoko Ishihara. « Optical and chemical properties of tholins ». Proceedings of the International Astronomical Union 4, S251 (février 2008) : 441–42. http://dx.doi.org/10.1017/s1743921308022114.

Texte intégral
Résumé :
AbstractFor over three decades tholins have been synthesized from mixtures of the cosmically abundant gases CH4, C2H6, NH3, H2O, HCHO, N2, and H2, previously in the Laboratory for Planetary Studies at Cornell University and in recent years at NASA Ames Research Center. The tholin synthesized by UV light or spark discharge on sequential and non-sequential pyrolysis GC-MS revealed hundreds of compounds, and on hydrolysis produced a large number of amino acids including racemic protein amino acids. Optical constants have been measured of many of the tholins, tholins produced from a condensed mixture of water and ethane at 77 K, poly HCN, and Titan tholin produced on electrical discharge through a mixture of 90% N2 and 10% CH4. Its optical constants were measured from soft x-rays to microwave for the first time.Here we report the absorption properties of Titan tholin that is produced in the temperature range 135 to 178 K where tholins are produced by magnetospheric charged particles, then pass through lower temperature at 70 K and finally to the ground at 95 K. While descending to the ground, it gets coated and processed on the way by other sources of energy such as long UV and cosmic rays. It is therefore expected that the stable products of CH4 photolysis react with Titan tholin to recycle the CH4 supply in Titan's atmosphere. Furthermore, the reactions of gaseous C2H6 with the reactive materials on the surface of the tholin could incorporate atmospheric C2H6 into the tholin and therefore might reduce the deposition rate of C2H6 onto the ground of Titan.
Styles APA, Harvard, Vancouver, ISO, etc.
2

Chen, Feng, Shengwei Liu et Jiaguo Yu. « Efficient removal of gaseous formaldehyde in air using hierarchical titanate nanospheres with in situ amine functionalization ». Physical Chemistry Chemical Physics 18, no 27 (2016) : 18161–68. http://dx.doi.org/10.1039/c6cp03037h.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
3

Chen, Aibing, Tiancong Zhao, Hui Gao, Limin Chen, Jinzhu Chen et Yifeng Yu. « Titanate nanotube-promoted chemical fixation of carbon dioxide to cyclic carbonate : a combined experimental and computational study ». Catalysis Science & ; Technology 6, no 3 (2016) : 780–90. http://dx.doi.org/10.1039/c5cy01024a.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
4

Shi, Liang, Bohua Dong, Rongjie Gao, Ge Su, Wei Liu, Chenghui Xia, Fenghuan Zhao et Lixin Cao. « Hierarchical Fe3O4@titanate microspheres with superior removal capability for water treatment : in situ growth and structure tailoring via hydrothermal assisted etching ». RSC Advances 5, no 89 (2015) : 73126–32. http://dx.doi.org/10.1039/c5ra06362k.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
5

Arun, V., et K. R. Sankaran. « Efficient and Eco-Friendly Synthesis of Fluorenone Azines by Using Sulphated Titania Acid Catalyst ». International Letters of Chemistry, Physics and Astronomy 58 (septembre 2015) : 137–43. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.58.137.

Texte intégral
Résumé :
Conjugated unsymmetrical azines have been synthesized in the presence of acid catalyst sulphated-titania (TiO2-SO42-) from fluorenone hydrazone with substituted aldehydes and acetophenones by using mortar and pestle. The scope of present synthetic route avoid in solvents, simple operating method and shorter reaction time. Special feature of synthetic method is recyclable catalyst for all in reactions.
Styles APA, Harvard, Vancouver, ISO, etc.
6

Arun, V., et K. R. Sankaran. « Efficient and Eco-Friendly Synthesis of Fluorenone Azines by Using Sulphated Titania Acid Catalyst ». International Letters of Chemistry, Physics and Astronomy 58 (2 septembre 2015) : 137–43. http://dx.doi.org/10.56431/p-un5562.

Texte intégral
Résumé :
Conjugated unsymmetrical azines have been synthesized in the presence of acid catalyst sulphated-titania (TiO2-SO42-) from fluorenone hydrazone with substituted aldehydes and acetophenones by using mortar and pestle. The scope of present synthetic route avoid in solvents, simple operating method and shorter reaction time. Special feature of synthetic method is recyclable catalyst for all in reactions.
Styles APA, Harvard, Vancouver, ISO, etc.
7

Yan, Ai, Wen Yan Huang, Yuan Cai Lv et Ming Hua Liu. « Preparation and Photocatalytic Activity of Laden SiO2/TiO2 Composite Photocatalyst ». Applied Mechanics and Materials 84-85 (août 2011) : 504–8. http://dx.doi.org/10.4028/www.scientific.net/amm.84-85.504.

Texte intégral
Résumé :
SiO2/TiO2 photocatalyst was prepared by a sol-gel method applying tetrabutyl titanate as the precursor and cullets as the carrier. The optimal preparing conditions of the SiO2/TiO2 composite photocatalyst were optimized. The optimal conditions included 2:1 of the molar ratio of tetraethyl orthosilicate to tetrabutyl titanate, 3 load times, 600°C of calcinations temperature, 3 h of calcination time, 3 mL of the dosage of CH3COOH and 5:1 of the molar ratio of water to tetrabutyl titanate. The photodegradation percentage of methylene blue could reach 92.26% under the above optimal conditions. Moreover, after three times of the repeated use, the SiO2/TiO2 composite photocatalyst still had a relatively high catalytic activity and stability, and the recycle percentage of the photocatalyst could reach 92.80%.
Styles APA, Harvard, Vancouver, ISO, etc.
8

Phonthammachai, N., J. Kim et T. J. White. « Synthesis and performance of a photocatalytic titania-hydroxyapatite composite ». Journal of Materials Research 23, no 9 (septembre 2008) : 2398–405. http://dx.doi.org/10.1557/jmr.2008.0290.

Texte intégral
Résumé :
The photocatalytic degradation of methylene blue (MB) over a porous titania-hydroxyapatite (HAp) composite under ultraviolet radiation was studied. The catalyst was prepared by coating porous HAp with a titanium butoxide [Ti(OBu)4] sol at titania loadings of 17–49 wt%. Quantitative powder x-ray diffraction showed higher proportions of anatase as the calcination temperature increased from 500 to 800 °C due to crystallization of an amorphous precursor. The transformation of anatase to rutile was delayed until 900 °C, demonstrating the high thermal stability of the composite. Decomposition of HAp to α- and β- tricalcium phosphates takes place at 900 °C and is accompanied by the formation of perovskite at 1000 °C. A systematic study of the influence of calcination temperature and titania:HAp ratios demonstrated that for the optimal material, a surface area of 100 m2 g−1 was obtained at a titania loading of 49 wt% and calcination temperature of 600 °C. A highly dispersed suspension of finely ground titania-HAp enhanced the photodegradation of MB, allowed a high percentage recovery of catalyst, and was shown to be recyclable.
Styles APA, Harvard, Vancouver, ISO, etc.
9

Bello, Roger H., Jacks P. Priebe et Luiz AF Coelho. « Barium titanate‐based nanodielectrics of two chemically recyclable thermosets ». Polymer International 68, no 4 (3 janvier 2019) : 700–713. http://dx.doi.org/10.1002/pi.5755.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
10

Maafa, Ibrahim M., et Mohammad Ashraf Ali. « Enhanced Organic Pollutant Removal Efficiency of Electrospun NiTiO3/TiO2-Decorated Carbon Nanofibers ». Polymers 15, no 1 (27 décembre 2022) : 109. http://dx.doi.org/10.3390/polym15010109.

Texte intégral
Résumé :
A nanocomposite comprised of nickel titanate/titania nanoparticles decorated with carbon nanofibers (NiTiO3/TiO2-decorated CNFs) is successfully synthesized via electrospinning and further utilized for methylene blue (MB) photodegradation. The morphology, phase, structural and chemical composition of the nanocomposite is investigated via scanning electron microscope, X-ray diffraction and transmission electron microscope equipped with energy dispersive X-ray. A mathematical model is developed to predict the photocatalytic activity of the produced nanocomposite by considering parameters such as initial dye concentration, light intensity, reaction temperature, and catalyst dosage. The reaction rate constant K1 decreased from 0.0153 to 0.0044 min−1 with an increase in the MB concentration from 5 to 15 mg L−1, while K2, K3, and K4 were found to increase with the increase in reaction temperature (0.0153 to 0.0222 min−1), light intensity (0.0153 to 0.0228 min−1) and catalyst dose concentration (0.0153 to 0.0324 min−1), respectively. The results obtained are found to be in good agreement with the modeling results and showed effective photodegradation activity. The performance of our catalyst is found to be better compared to other catalysts previously reported in the literature. The recyclability data of the synthesized NiTiO3/TiO2-decorated CNFs catalyst for four runs show that the catalyst is quite stable and recyclable. This nanocomposite photocatalyst offers a low-cost solution for wastewater pollution problems and opens new avenues to further explore the electrospinning method for the synthesis of nanocomposites.
Styles APA, Harvard, Vancouver, ISO, etc.
11

Zhou, Hua Lan, Sha Wu, Zhong Zou, Qin Qin et Wen Jian Shi. « Titania-Phosphotungstic Acid Nanocomposites Dispersed Homogeneously in Mesopores as the Recyclable Photocatalyst ». Advanced Materials Research 152-153 (octobre 2010) : 202–7. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.202.

Texte intégral
Résumé :
Heterogeneous photocatalytic materials, titania–phosphotungstic acid nanocomposites in the mesopores of SBA-15 (TiO2-H4PW12O40/SBA15) were prepared by sol–gel method. Compositions and structures of the nanocomposites were characterized by X-ray diffraction (XRD), UV-visible absorption spectroscopy and transmission electron microscopy (TEM). Uniform mesoporous SBA15 consisting of long-range channels provides the immobilization of titania-phosphotungstic acid nanocomposites. The photocatalytic activity of the prepared TiO2-H4PW12O40/SBA15 powders was evaluated from an analysis of the photocatalytic degradation of methyl orange. The results indicated that photocatalytic activity increased with the amount of H4PW12O40 from 0% to 10% and decreased when the amount of H4PW12O40 was above 10%. It is due to the synergetic reaction of H4PW12O40 and TiO2. However, much more H4PW12O40 can occupy the active center of TiO2. TiO2 can inhibit the decomposition of H4PW12O40 in the TiO2-H4PW12O40/SBA15 composites. On the other hand, H4PW12O40 repressed the TiO2 particle growth during calcination process. The composite catalyst also had the advantage of easily being recovered and reused.
Styles APA, Harvard, Vancouver, ISO, etc.
12

Wang, Min, Zhen Xiao Duan, Tao Fang, Ming Hai Wang et Guo Zhi Fan. « Synthesis of Diphenyl Carbonate from Carbon Dioxide Catalyzed by ZnCl2 Supported on SiO2-TiO2 ». Advanced Materials Research 391-392 (décembre 2011) : 1235–38. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.1235.

Texte intégral
Résumé :
SiO2-TiO2 mixed oxides was prepared by the homogeneous precipitation method using tetraethoxysilane and tetrabutyl titanate as precursors. Zinc catalyst supported on SiO2-TiO2 was prepared by the incipient wetness impregnation method and employed as effective catalyst for the direct synthesis of diphenyl carbonate from carbon dioxide and phenol. The stability of the heterogeneous catalyst was also studied in detail. No significant loss of activity was observed during the 5 runs except for the first recycle.
Styles APA, Harvard, Vancouver, ISO, etc.
13

Chatterjee, Sriparna, Avesh K. Tyagi et Pushan Ayyub. « Efficient Photocatalytic Degradation of Rhodamine B Dye by Aligned Arrays of Self-Assembled Hydrogen Titanate Nanotubes ». Journal of Nanomaterials 2014 (2014) : 1–7. http://dx.doi.org/10.1155/2014/328618.

Texte intégral
Résumé :
We show that an aligned array of hydrothermally grown, multiwalled hydrogen titanate (H2Ti3O7) nanotubes—anchored to both faces of a metallic Ti foil—acts as an efficient photocatalyst. We studied the degradation of rhodamine B dye in the presence of the nanostructured photocatalyst under UV irradiation, by monitoring the optical absorption of the dye. Rhodamine B was chosen as a representative—and particularly harmful—industrial pollutant dye. The inner and outer diameters of the H2Ti3O7nanotubes were 5 nm and 10 nm, respectively. The nanotube array catalyst is recyclable and structurally stable. Most importantly, it shows comparable or higher photodecomposition rate constant than those of both H2Ti3O7nanotube powder and P-25 (Degussa). The enhanced photocatalytic performance may be ascribed to the nanotube array having a superhydrophilic surface with a high accessible surface area.
Styles APA, Harvard, Vancouver, ISO, etc.
14

Przydacz, Martyna, Marcin Jędrzejczyk, Jacek Rogowski, Małgorzata Szynkowska-Jóźwik et Agnieszka M. Ruppert. « Highly Efficient Production of DMF from Biomass-Derived HMF on Recyclable Ni-Fe/TiO2 Catalysts ». Energies 13, no 18 (8 septembre 2020) : 4660. http://dx.doi.org/10.3390/en13184660.

Texte intégral
Résumé :
5-Hydroxymethylfurfural, which can be derived from lignocellulosic biomass, can be transformed via the hydrodeoxygenation process to potential biofuels, such as 2,5 dimethylfuran or other chemicals of industrial importance. Non-noble metal catalysts constitute a robust and cheap solution for this process. In this work, the modification of the Ni/TiO2 catalyst by the addition of iron and support modification was evaluated. It was shown that bimetallic Ni-Fe catalysts are more selective and stable than their monometallic counterparts. This improvement in properties depends on the Ni:Fe ratio, but the support plays an equally important role—namely the high surface area anatase titania support improves the metal dispersion, resulting in a higher catalytic activity, and the formation of NiFe alloy facilitates the C=O bond cleavage. Such catalysts are active and stable and can be easily separated from the reaction mixture thanks to their magnetic properties.
Styles APA, Harvard, Vancouver, ISO, etc.
15

Gao, Jun-Guo, Hong-Shuo Liu, Ting-Tai Lee, Uwe Schachtely, Hitoshi Kobayashi et Li-Li Li. « Effect of Hydrophilic/Hydrophobic Nanostructured TiO2 on Space Charge and Breakdown Properties of Polypropylene ». Polymers 14, no 14 (6 juillet 2022) : 2762. http://dx.doi.org/10.3390/polym14142762.

Texte intégral
Résumé :
Polypropylene (PP) has received more and more attention in the field of insulating materials as a recyclable thermoplastic. To further enhance the applicability of polypropylene in the field of insulation, it needs to be modified to improve its electrical properties. In this paper, the impact mechanism of AEROXIDE® TiO2 P 90 (P90) and AEROXIDE® TiO2 NKT 90 (NKT90) as nanosized hydrophilic and hydrophobic fumed titania from Evonik on the electrical properties of PP was studied mainly through the crystallization behavior and space charge distribution of PP nanocomposites. Two kinds of nanostructured TiO2 were melt-blended with PP according to four types of contents. The results of alternating current (AC)/direct current (DC) breakdown field strength of the two materials were explained by studying the microstructure and space charge characteristics of the nanocomposites. Among them, hydrophilic nanostructured TiO2 are agglomerated when the content is low. The spherulite size of the nanocomposite is large, the space charge suppression ability is poor, the charge is easy to penetrate into the pattern, and the AC/DC breakdown field strength is significantly reduced. However, hydrophobic nanostructured TiO2 has better dispersion in PP, smaller spherulites, more regular arrangement, and less space charge accumulation. The charge penetration occurs only when the nanostructured material content is 2 wt%, and the AC/DC breakdown strength increases by 20.8% at the highest when the nanostructured material content is 1 wt%. It provides the possibility to prepare recyclable high-performance DC PP composite insulating materials.
Styles APA, Harvard, Vancouver, ISO, etc.
16

Silviana, S., A. Siregar, I. Mutaqqin et R. M. Dikrama. « Performance evaluation of 2-C-470 compressor of gas recycle process at PT. Lotte Chemical Titan Nusantara ». Journal of Physics : Conference Series 1943, no 1 (1 juillet 2021) : 012178. http://dx.doi.org/10.1088/1742-6596/1943/1/012178.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
17

Chen, Zhili, Shihua Chen, Yonghe Li, Xiaolei Si, Jun Huang, Sylvain Massey et Guangliang Chen. « A recyclable and highly active Co3O4 nanoparticles/titanate nanowire catalyst for organic dyes degradation with peroxymonosulfate ». Materials Research Bulletin 57 (septembre 2014) : 170–76. http://dx.doi.org/10.1016/j.materresbull.2014.05.046.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
18

Raturi, Parul, et J. P. Singh. « Understanding the wetting properties of nanostructured strontium titanate and its application for recyclable oil/water separation ». Advanced Powder Technology 31, no 3 (mars 2020) : 1342–48. http://dx.doi.org/10.1016/j.apt.2020.01.004.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
19

SHANKAR, H., R. SARAVANAN, A. STEPHEN et V. NARAYANAN. « PHOTOCATALYTIC DEGRADATION OF AQUEOUS METHYL ORANGE USING NANOTITANIA LOADED Mo-MCM-41 ». International Journal of Nanoscience 10, no 04n05 (août 2011) : 1131–35. http://dx.doi.org/10.1142/s0219581x11009581.

Texte intégral
Résumé :
Nanocrystalline titanium dioxide, TiO2 , is a well studied and commonly used material for photocatalytic applications. However, the control of particle size, monodispersity, large catalytic surface for sufficient adsorption of organic pollutants, recovery and recycle of TiO2 nanoparticles are challenging tasks. Hence in this work, titania has been introduced into the nanopores (2–10 nm size) of MCM-41 to produce stable nanoparticles of uniform size and shape. Further, the photocatalytic efficiency can be improved by lengthening the life time of the excited electrons/holes during photoreaction. This could be achieved by incorporating molybdenum in to the MCM-41 silica matrix in addition to titania loading. In the present study, the synthesis and the photocatlaytic efficiency of a new photocatalyst TiO2@Mo -MCM-41 (25 wt.% TiO2 loaded Mo incorporated MCM-41) are reported. Mo -MCM-41, with different ratios of Si to Mo ( Si/Mo = 25,50,75), is synthesized by hydrothermal method and loaded with 25 wt.% TiO2 using sol–gel method. The photocatalytic activity of the prepared samples was evaluated using methyl orange as a model organic compound. X-ray diffraction (XRD), Transmission Electron Microscopy (TEM) and nitrogen adsorption–desorption isotherm (BET analysis) measurements were used to investigate the effects of the incorporated elements in the structure of MCM-41. It was found that the photodegradation ability of 25% TiO2 loaded Mo -MCM-41 was highly related to the amount of Mo atoms present in the sample with the optimum atomic ratio of Si to Mo being 50.
Styles APA, Harvard, Vancouver, ISO, etc.
20

Aquino, Ramon Vinícius Santos de, Ada Azevedo Barbosa, Rafaela Ferreira de Carvalho, Marina Gomes Silva, Welenilton José do Nascimento Júnior, Túlio Diego da Silva, Josivan Pedro Silva et Otidene Rossiter Sá da Rocha. « Degradation study of tris(2-butoxyethyl) phosphate with TiO2 immobilized on aluminum meshes employing artificial neural networks ». Water Science and Technology 80, no 6 (15 septembre 2019) : 1163–73. http://dx.doi.org/10.2166/wst.2019.363.

Texte intégral
Résumé :
Abstract This work presents the study of tris(2-butoxyethyl) phosphate advanced oxidation in TiO2-containing systems. Titania was immobilized on aluminum surfaces from recyclable materials and the results were compared with the suspension system. The initial concentration of photocatalyst and the oxidizing agent was optimized in a 23 experimental design and a kinetic study of the reactions was performed in the selected conditions. The experimental data were fitted to the pseudo-first-order model (rate constants estimated at 0.0129 ± 0.0009 and 0.0079 ± 0.0006 min−1 for the systems with TiO2 in suspension and immobilized, respectively). Artificial neural networks were also employed to model the experimental data and they presented correlation coefficients superior to 0.98 in all the training operations. After five cycles of degradation, the TiO2–aluminum meshes exhibited a very low decrease in photocatalytic activity (inferior to 2%). Acute phytotoxicity assays demonstrated that the byproducts of the oxidation of TBEP molecules are less toxic than the raw samples regarding lettuce seeds. For both TiO2 systems, COD decreased considerably as a consequence of the degradation. The immobilized TiO2 system achieved similar degradation rates when compared with the suspension system.
Styles APA, Harvard, Vancouver, ISO, etc.
21

Ma, Yan, Zhihuan Zhao, Jimin Fan, Zhanyong Gu, Bin Zhang et Shu Yin. « Ag-TON nanospheres coupled with fly ash cenospheres for wastewater treatment under visible light irradiation ». Water Science and Technology 78, no 11 (17 décembre 2018) : 2321–27. http://dx.doi.org/10.2166/wst.2018.513.

Texte intégral
Résumé :
Abstract Using tetra-n-butyl titanate as raw material and fly ash cenospheres (FAC) as carrier, the photocatalysts of Ag-TON/FAC were successfully prepared by solvothermal and in-situ hydrolysis method. These visible light photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), fluorescence spectroscopy (FL) and UV–vis diffuse reflectance spectra (DRS). In this study, methyl orange and ciprofloxacin were used as wastewater degradation targets to investigate the effect of the amount of titanium dioxide and the amount of Ag doping on the activity of photocatalysts. On the basis of this, the optimal ratio of TiO2 to FAC was 2:1 and the optimum doping ratio of Ag was determined to be 15 wt.%. The composite photocatalysts dispersed uniformly and were easy to recycle and reuse, which were benefits in fully utilizing the solar energy. The degradation efficiency remained at more than 60% after being renewed five times for MO and ciprofloxacin. The photocatalysts of Ag-TON/FAC can reduce the environmental burden caused by FAC also.
Styles APA, Harvard, Vancouver, ISO, etc.
22

Chang, Yu-Cheng, I.-Chun Lin, Ning-Chien Chin, Sin-Ei Juang et Chia-Man Chou. « Na2Ti3O7@RF@Ag Heterostructures as Efficient Substrates for SERS and Photocatalytic Applications ». Molecules 29, no 1 (30 décembre 2023) : 218. http://dx.doi.org/10.3390/molecules29010218.

Texte intégral
Résumé :
A multi-step procedure was effectively employed to synthesize innovative three-dimensional (3D) heterostructures encompassing sodium titanate (Na2Ti3O7) nanowire cores, an intermediate resorcinol–formaldehyde (RF) layer, and outer silver (Ag) nanoparticle sheaths, referred to as Na2Ti3O7@RF@Ag heterostructures. Initially, a one-step hydrothermal technique facilitated the direct growth of single-crystal Na2Ti3O7 nanowires onto a flexible Ti foil. Subsequently, a two-step wet chemical process facilitated the sequential deposition of an RF layer and Ag nanoparticles onto the Na2Ti3O7 nanowires at a low reaction temperature. Optimal concentrations of silver nitrate and L-ascorbic acid can lead to the cultivation of Na2Ti3O7@RF@Ag heterostructures exhibiting heightened surface-enhanced Raman scattering (SERS), which is particularly beneficial for the detection of rhodamine B (RhB) molecules. This phenomenon can be ascribed to the distinctive geometry of the Na2Ti3O7@RF@Ag heterostructures, which offer an increased number of hot spots and surface-active sites, thereby showcasing notable SERS enhancement, commendable reproducibility, and enduring stability over the long term. Furthermore, the Na2Ti3O7@RF@Ag heterostructures demonstrate remarkable follow-up as first-order chemical kinetic and recyclable photocatalysts for the photodecomposition of an RhB solution under UV light irradiation. This result can be attributed to the enhanced inhibition of electron–hole pair recombination and increased surface-active sites.
Styles APA, Harvard, Vancouver, ISO, etc.
23

Ameen, Maria, Muhammad Zafar, Mushtaq Ahmad, Mamoona Munir, Islem Abid, Abd El-Zaher M. A. Mustafa, Mohammad Athar et al. « Cleaner Biofuel Production via Process Parametric Optimization of Nonedible Feedstock in a Membrane Reactor Using a Titania-Based Heterogeneous Nanocatalyst : An Aid to Sustainable Energy Development ». Membranes 13, no 12 (27 novembre 2023) : 889. http://dx.doi.org/10.3390/membranes13120889.

Texte intégral
Résumé :
Membrane technology has been embraced as a feasible and suitable substitute for conventional time- and energy-intensive biodiesel synthesis processes. It is ecofriendly, easier to run and regulate, and requires less energy than conventional approaches, with excellent stability. Therefore, the present study involved the synthesis and application of a highly reactive and recyclable Titania-based heterogeneous nanocatalyst (TiO2) for biodiesel production from nonedible Azadhiracta indica seed oil via a membrane reactor, since Azadhiracta indica is easily and widely accessible and has a rich oil content (39% w/w). The high free fatty acids content (6.52 mg/g KOH) of the nonedible oil was decreased to less than 1% via two-step esterification. Following the esterification, transesterification was performed using a heterogeneous TiO2 nanocatalyst under optimum conditions, such as a 9:1 methanol–oil molar ratio, 90 °C reaction temperature, 2 wt.% catalyst loading, and an agitation rate of 600 rpm, and the biodiesel yield was optimized through response surface methodology (RSM). Azadhiracta indica seed oil contains 68.98% unsaturated (61.01% oleic acid, 8.97% linoleic acid) and 31.02% saturated fatty acids (15.91% palmitic acid, 15.11% stearic acid). These fatty acids transformed into respective methyl esters, with a total yield up to 95% achieved. The biodiesel was analyzed via advanced characterization techniques like gas chromatography–mass spectrometry (GC-MS), Fourier transform infrared spectroscopy (FT-IR), and nuclear magnetic resonance (NMR), whereas the catalyst was characterized via X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), and Fourier transform infrared spectroscopy (FT-IR). Due to its physicochemical properties, Azadirachta indica seed oil is a highly recommended feedstock for biodiesel production. Moreover, it is concluded that the Titania-based heterogeneous nanocatalyst (TiO2) is effective for high-quality liquid fuel synthesis from nonedible Azadirachta indica seed oil in a membrane reactor, which could be an optional green route to cleaner production of bioenergy, eventually leading to sustenance, robustness, and resilience that will aid in developing a holistic framework for integrated waste management.
Styles APA, Harvard, Vancouver, ISO, etc.
24

Adilina, Indri Badria, Takayoshi Hara, Nobuyuki Ichikuni, Nobuhiro Kumada et Shogo Shimazu. « Recyclable Pd-Incorporated Perovskite-Titanate Catalysts Synthesized in Molten Salts for the Liquid-Phase Oxidation of Alcohols with Molecular Oxygen ». Bulletin of the Chemical Society of Japan 86, no 1 (15 janvier 2013) : 146–52. http://dx.doi.org/10.1246/bcsj.20120215.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
25

Kaplan, Renata, Boštjan Erjavec, Marin Senila et Albin Pintar. « Catalytic wet air oxidation of bisphenol A solution in a batch-recycle trickle-bed reactor over titanate nanotube-based catalysts ». Environmental Science and Pollution Research 21, no 19 (28 mai 2014) : 11313–19. http://dx.doi.org/10.1007/s11356-014-3042-1.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
26

Adilina, Indri Badria, Takayoshi Hara, Nobuyuki Ichikuni, Nobuhiro Kumada et Shogo Shimazu. « ChemInform Abstract : Recyclable Pd-Incorporated Perovskite-Titanate Catalysts Synthesized in Molten Salts for the Liquid-Phase Oxidation of Alcohols with Molecular Oxygen. » ChemInform 44, no 17 (4 avril 2013) : no. http://dx.doi.org/10.1002/chin.201317027.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
27

Huang, Wei Hong, et Rui Liu. « Photocatalytic Degradation of p-Nitroaniline with Composite Photocatalyst H3P12W40/TiO 2 ». Advanced Materials Research 233-235 (mai 2011) : 967–70. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.967.

Texte intégral
Résumé :
The prepared composite photocatalyst H3PW12O40/TiO2 was synthesized by sol-gel impregnation method and characterized by scanning electron microscope(SEM), energy-dispersive X-ray spectroscopy(EDS), Fourier transform infrared(FT-IR), X-ray diffraction(XRD), UV-vis diffuse reflectance spectrum(DRS) to investigate its optical, physical and chemical properties. The results indicated that the modified catalyst was coated with P and W element, still have uniform anatase structure. Meanwhile, there is a chemical interaction exists between the Keggin unit and the surface of the titania matrix. Compared with original H4PW12O40 or TiO2 matrix, the adsorption threshold onset of the composite extended to the visible region. Effects of H3PW12O40/TiO2 dosage, pH value, initial p-NA concentration on the photocatalytic degradation of p-NA under 250W UV irradiation were investigated. The optimal H3PW12O40/TiO2 dosage and pH value for degradation of 10mg/L p-NA were o.6g/L and 3.0, respectively. The degradation rate of p-NA by H3PW12O40/TiO2 process could be fitted pseudo-first-order kinetics. Moreover, 66% degradation of p-NA was still observed in the 5th recycle experiment. Futhermore, 4-Aminophenol, Phenol, Hydroquinone, 4-Benzoquinone and other intermediate products were indentifieded by GC/MS and a possible reaction mechanism is proposed on the basis of all the information obtained from the analysis of FT-IR and the above intermediates.
Styles APA, Harvard, Vancouver, ISO, etc.
28

Das, Paramita, Ray J. Butcher et Chhanda Mukhopadhyay. « Zinc titanate nanopowder : an advanced nanotechnology based recyclable heterogeneous catalyst for the one-pot selective synthesis of self-aggregated low-molecular mass acceptor–donor–acceptor–acceptor systems and acceptor–donor–acceptor triads ». Green Chemistry 14, no 5 (2012) : 1376. http://dx.doi.org/10.1039/c2gc16641k.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
29

Sandrucci, Eugenio, Federico Marini et Sergio Brutti. « Monitoring the State of Health (SOH) of Green Batteries (GreenBat) ». ECS Meeting Abstracts MA2023-02, no 54 (22 décembre 2023) : 2546. http://dx.doi.org/10.1149/ma2023-02542546mtgabs.

Texte intégral
Résumé :
Here we focus on the study of state of health monitoring of secondary batteries with advanced “green” formulations. European recycle map on battery energy storage plans to replace positive electrodes consisting of cobalt (Co) and fluorinated (F) graphite-based negative electrodes constituents with environmentally sustainable alternatives. Recently, "green formulations" was validated; in particular, recent trends suggest the use of electrodes based on silicon (Si), Co-free manganites (LiMnO2) aqueous soluble binders and fluorine-free electrolytes [1]. Our aims are to describe the health and the degradation of the cells with electrochemical techniques and to describe the chemical and morphological changes occurring during the battery cycling, through spectroscopies (Raman and IR) operating in parallel with impedance analysis. These experimental data will be integrated together in a multiblock dataset, which will constitute the basis for chemometric processing. The purpose of this chemometric modelling is to correlate SOH evolution to the chemical and physical state of the battery [1]. Here we illustrate the analysis of SOH of two different pouch cells formulation constituted by LTO (Lithium-Titanate) as anode, LFP (Lithium-Iron-Phosphate) as cathode and the LP30 electrolyte (EC:DMC 1:1 and LiPF6 1M); the second formulation is constituted by a thin film layer of commercial Li metal (purity of 99.7%) as anode, LFP as cathode and an ethers based formulation as electrolyte. After formation cycles (CC-CV), the cells have been submitted to aging tests. The different operating conditions are chosen with an Experimental Design (ED) and supported by a PCA analysis. The PCA analysis it was used to choose the operating parameters for the subsequent aging experiments. Is illustrated also the analysis of SOH of a coin cell formulation consisted by a LRLO (Lithium Rich Layer Oxide) as anode, commercial Li metal layer as cathode and LP30 additive with a ionic liquid (IL) as electrolyte. Turning to the chemometric modelling, as a starting point we verified the ability of PLS regression applied to the voltage profiles during charge cycles to estimate the SOH of a benchmark dataset by Lin et al. [1] References [1] M. Lin,D. Wu, Journal of Power Sources, 2022, 518, 230774. Figure 1
Styles APA, Harvard, Vancouver, ISO, etc.
30

Das, Paramita, Ray J. Butcher et Chhanda Mukhopadhyay. « ChemInform Abstract : Zinc Titanate Nanopowder : An Advanced Nanotechnology Based Recyclable Heterogeneous Catalyst for the One-Pot Selective Synthesis of Self-Aggregated Low-Molecular Mass Acceptor-Donor-Acceptor-Acceptor Systems and Acceptor-Donor-Accepto ». ChemInform 43, no 39 (30 août 2012) : no. http://dx.doi.org/10.1002/chin.201239045.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
31

COMBRES, Yves. « Métallurgie et recyclage du titane et de ses alliages ». Élaboration et recyclage des métaux, mars 2016. http://dx.doi.org/10.51257/a-v2-m2355.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
32

COMBRES, Yves. « Métallurgie et recyclage du titane et de ses alliages ». Élaboration et recyclage des métaux, juin 1997. http://dx.doi.org/10.51257/a-v1-m2355.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
33

Zhao, Yan, Yijun Wang, Xinyan Zhang, Xinlu Wang et Chuanyu Qin. « Recyclable sodium titanate/graphite oxide/polyurethane polymer for efficient removal of radioactive strontium(ii) from contaminated water ». New Journal of Chemistry, 2025. https://doi.org/10.1039/d4nj04675g.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
34

Doan, Nhuan N., Khanh T. Nguyen, Giang P. T. Nguyen et Linh T. T. Nguyen. « Titania : From a waste solid catalyst to an inorganic pigment ». Canadian Journal of Chemical Engineering, 18 février 2025. https://doi.org/10.1002/cjce.25642.

Texte intégral
Résumé :
AbstractThe aim of the present study is to recover a waste titania catalyst from α‐pinene isomerization, recycle it and use it in the production of inorganic pigments. The acid‐contaminated titania (ACT), prepared from ilmenite ore by sulphation, has the potential to function as a solid acid catalyst due to the presence of both Brønsted and Lewis acid sites, with a specific surface area of 163 m2 g−1. The catalytic efficiency was evaluated in the isomerization of turpentine (83.8 wt.% α‐pinene) at a reaction temperature of 120°C, using a turpentine:catalyst mass ratio of 4:1. The α‐pinene conversion was 99.6% with a camphene selectivity of 43 wt.%. The waste catalyst was recovered and subjected to calcination at a suitable temperature to remove all organic compounds and make it suitable for use in the production of inorganic pigments. The calcined product exhibits pigment properties including a pure rutile phase, an average grain size of 0.2 μm, a specific surface area of 29 m2 g−1 and a reflectance in visible light of 95%. This study has provided a practical, simple, and cost‐effective solution for the treatment of residual acid on titania obtained from the hydration of titanyl sulphate, while also demonstrating the simultaneous application of titania in catalysis and pigment production.
Styles APA, Harvard, Vancouver, ISO, etc.
35

Gaudino, Emanuela Calcio, Maela Manzoli, Maria Luisa Testa, Valeria La Parola, Giorgio Grillo, Giancarlo Cravotto et Silvia Tabasso. « Batch and flow green microwave‐assisted catalytic conversion of levulinic acid to pyrrolidones ». ChemSusChem, 6 septembre 2023. http://dx.doi.org/10.1002/cssc.202301200.

Texte intégral
Résumé :
This paper reports a new sustainable protocol for the microwave‐assisted catalytic conversion of levulinic acid into N‐substituted pyrrolidones over tailor‐made mono (Pd, Au) or bimetallic (PdAu) catalysts supported on either highly mesoporous silica (HMS) or titania‐doped HMS, exploiting the advantages of dielectric heating. MW‐assisted reductive aminations of levulinic acid with several amines were first optimized in batch mode under hydrogen pressure (5 bar) in solvent‐free conditions. Good‐to‐excellent yields were recorded at 150 °C in 90 min over the PdTiHMS and PdAuTiHMS, that proved recyclable and almost completely stable after six reaction cycles. Aiming to scale‐up this protocol, a MW‐assisted flow reactor was used in combination with different green solvents. Cyclopentyl methyl ether (CPME) provided a 99% yield of N‐(4‐methoxyphenyl) pyrrolidin‐2‐one at 150 °C over PdTiHMS. The described MW‐assisted flow synthesis proves to be a safe procedure suitable for further industrial applications, while averting the use of toxic organic solvents.
Styles APA, Harvard, Vancouver, ISO, etc.
36

Dong, Xiaofeng, Xiaoan Lv, Junwei Huang, Yue Chang, Xiaona Ren et Changchun Ge. « Preparation of one-dimensional hierarchical sodium titanate under mild conditions and its potential application in recyclable Ag+-loaded antimicrobials ». Colloids and Surfaces A : Physicochemical and Engineering Aspects, août 2023, 132170. http://dx.doi.org/10.1016/j.colsurfa.2023.132170.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
37

Kouser, Mobina, Neha Sharma et Monika Gupta. « Tunning of catalytic performance in coupling, reduction and oxidation of hydrothermal assisted mixed metal oxides of Pd and Cu loaded over mesoporous nanostructure titania coated N‐doped silica using rice husk ». Applied Organometallic Chemistry, 28 mars 2024. http://dx.doi.org/10.1002/aoc.7434.

Texte intégral
Résumé :
Silica–titania‐based mesoporous nanomaterials due to their widespread availability and inexpensive cost have been employed in an extensive range of applications, including heterogeneous catalysis. This research article discusses the hydrothermal synthesis of highly efficient heterogeneous nanocatalyst, that is, mixed metal oxides of Pd and Cu immobilized over silica–titania mesoporous nanostructure and its application in coupling, reduction and oxidation reactions. It was characterized by Fourier transform infrared spectroscopy (FTIR), powder X‐ray diffraction (P‐XRD), field emission gun–scanning electron microscopy (FEG‐SEM), energy‐dispersive X‐ray analysis (EDX), high‐resolution transmission electron microscopy (HR‐TEM), X‐ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), UV–visible spectroscopy (UV–VIS), Brunauer–Emmett–Teller (BET), X‐ray resonance fluorescence (XRF), photoluminescence (PL) and inductively coupled plasma–atomic emission spectroscopy (ICP‐AES) studies to assemble information regarding various structural features. XPS analysis successfully confirmed the presence of mixed oxidation state of Pd and Cu, that is, Pd(0), Pd(II), Cu(0), Cu(I) and Cu(II) over the nanocatalytic support. TEM images showed that the PdCu alloy had spherical shape with average size between 3 and 4 nm. BET analysis indicated that the catalyst has specific surface area of 57.296 m2 g−1 with average pore diameter of 1.84 nm. The results of TGA and DTA analysis demonstrated that the maximum temperature up to which PC‐TNS can catalysed organic reactions was 170°C. The average crystallite size of PC‐TNS was came around 16.08 nm calculated using Scherrer's equation. Moreover, synthesized heterogeneous nanocatalyst was highly recyclable and FEG‐SEM, P‐XRD and XPS findings confirmed the structural disruption after sixth or seventh catalytic run resulted in decrease in yield of products. In general, nanocatalysts can be convincingly more superior to other heterogeneous nanocatalyst due to their unique features such as high specific surface area, high reusability, high reactivity, high product yield and environmentally friendly.
Styles APA, Harvard, Vancouver, ISO, etc.
38

Mohammed, Shahansha, Jameelammal Shajeelammal, Adersh Asok et Satyajit Shukla. « Autoclave and pulsed ultrasound cavitation based thermal activation of persulfate for regeneration of hydrogen titanate nanotubes as recyclable dye adsorbent ». Environmental Science and Pollution Research, 22 avril 2022. http://dx.doi.org/10.1007/s11356-022-20282-2.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
39

Dai, Xin, Lijiang Liu, Fangjun Lin, Zhenxi Wang, Yong Peng, Youping Liu, Jixiang Luo et Ziyong Ma. « Study on a novel flexible high dielectric poly (isoprene‐co‐acrylonitrile)/barium titanate composite with a reversible cross‐linked structure ». Polymer Composites, 8 août 2024. http://dx.doi.org/10.1002/pc.28901.

Texte intégral
Résumé :
AbstractReversible cross‐linked structures are widely used to turn thermoset plastics into recyclable and self‐healing vitrimer materials, but seldom applied in traditional flexible rubber/ceramic composites. In this paper, dioxaborolanes based flexible poly (isoprene (IP)‐co‐acrylonitrile (AN)) vitrimer is synthesized as the rubber matrix by copolymerizing with functional monomers at 5°C for 7 h, and mixed with 5 wt% modified barium titanates (BT) to prepare flexible high dielectric vitrimer composite. The materials are characterized by FTIR, TGA, SEM, DMA, etc. The results indicate that reversible crosslinking can occur above 76.4°C, and copolymerizing with the dioxaborolanes based monomers can turn poly (IP‐co‐AN) into the flexible vitrimer. The poly (IP‐co‐AN)/BT vitrimer composite not only shows a good thermal stability below 145.6°C, but also exhibits an excellent particle dispersivity and a certain self‐healing function at 80°C. The poly (IP‐co‐AN)/BT vitrimer composite has a storage modulus E' about 3.18 MPa at 25°C and Tg about −5.4°C, and shows a higher relative permittivity about 7.5 and lower dielectric loss about 0.156 at 1 k Hz. The results indicate that this paper provides a new method to achieve multifunction and high dielectricity for composites.Highlight Reversible cross‐linked structures are applied in rubber / ceramic composites Cross‐linked flexible composites are reprocessable and self‐healing Reversible bonds between particles and matrix improve compatibility Synergism of BaTiO3 and cross‐linked structure enhances dielectric properties
Styles APA, Harvard, Vancouver, ISO, etc.
40

Guan, Sujun, Lijun Wang, Liang Hao, Hiroyuki Yoshida, Takaomi Itoi, Yun Lu, Chiaki Terashima et Akira Fujishima. « Achieving water-floatable photocatalyst on recycled bamboo chopsticks ». Scientific Reports 14, no 1 (25 avril 2024). http://dx.doi.org/10.1038/s41598-024-60272-7.

Texte intégral
Résumé :
AbstractDisposable bamboo chopsticks (DBCs) are difficult to recycle, which inevitably cause secondary pollution. Based on energy and environmental issues, we propose a facile strategy to fabricate floatable photocatalyst (fPC) coated onto DBCs, which can be flexibly used in water purification. The photocatalyst of titania and titanium carbide on bamboo (TiO2/TiC@b) was successfully constructed from TiC-Ti powders and DBCs using a coating technique followed heat treatment in carbon powder, and the fPC exhibited excellent photocatalytic activity under visible light irradation. The analysis results indicate that rutile TiO2 forms on TiC during heat treatment, achieving a low-density material with an average value of approximately 0.5233 g/cm3. The coatings of TiO2/TiC on the bamboo are firm and uniform, with a particle size of about 20–50 nm. XPS results show that a large amount of oxygen vacancies is generated, due to the reaction atmosphere of more carbon and less oxygen, further favoring to narrowing the band gap of TiO2. Furthermore, TiO2 formed on residual TiC would induce the formation of a heterojunction, which effectively inhibits the photogenerated electron–hole recombination via the charge transfer effect. Notably, the degradation of dye Rhodamine B (Rh.B) is 62.4% within 3 h, while a previous adsorption of 36.0% for 1 h. The excellent photocatalytic performance of TiO2/TiC@b can be attributed to the enhanced reaction at the water/air interface due to the reduced light loss in water, improved visible-light response, increased accessible area and charge transfer effect. Our findings show that the proposed strategy achieves a simple, low-cost, and mass-producible method to fabricate fPC onto the used DBCs, which is expected to applied in multiple fields, especially in waste recycling and water treatment.
Styles APA, Harvard, Vancouver, ISO, etc.
Nous offrons des réductions sur tous les plans premium pour les auteurs dont les œuvres sont incluses dans des sélections littéraires thématiques. Contactez-nous pour obtenir un code promo unique!

Vers la bibliographie