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Tesis sobre el tema "Water - Purification - Adsorption"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 6 de septiembre de 2023

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1

Stocking, Kristin 1959. "Adsorption of MS-2 bacteriophage to silica." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277019.

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Batch and column experiments were performed to investigate the adsorption of bacteriophage MS-2 to silica at pH 5. Linear isotherm analysis of batch experiment data gave partition coefficient (KP) estimates of 270 cm³/g and 580 cm³/g for 4°C and 24°C, respectively. Breakthrough-type column experiments indicated that sorption and desorption were slow, as evidenced by a slow approach to breakthrough and tailing of the desorption limb. A non-equilibrium advection-dispersion model with all adsorption sites on the silica assumed to be kinetically controlled was used to model the column data. The mo

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2

Imwer, Serge Mapan. "Adsorption of perfluorinated water contaminants on Agave sisalana activated carbon fibre." Thesis, Cape Peninsula University of Technology, 2014. http://hdl.handle.net/20.500.11838/867.

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Thesis submitted in fulfilment of the requirements for the degree Magister Technologiae: Chemical Engineering in the Faculty of Engineering at the Cape Peninsula University of Technology 2014<br>An awareness campaign on the harmful effects of Perfluorinated compounds (PFCs), especially Perfluorooctanoic acid (PFOA) and Perfluorooctane sulfonate (PFOS) has been conducted to inform the general public about the impact of these organic compounds on hu-mans and biota. These compounds have been shown to be potential carcinogens, as indi-cated by the United States Environmental Protection Agency (USE

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3

Tan, Lo 1963. "The effects of activated carbon adsorption and ozonation on trihalomethane speciation." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/276953.

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Two surface water sources in the southwestern United States, Colorado River Water (CRW) and California State Project Water (SPW), were studied in bench-scale experiments examining two Trihalomethane (THM) precursor removal processes, activated carbon adsorption and ozone oxidation. Both source water contained bromide (Br-) ion leading to brominated THMs upon chlorination. Activated carbon removed THM precursors, as measured by dissolved organic carbon (DOC), while having little effect on bromide. The net result was an increase in the ratio of Br-/DOC and an increase in the relative abundance o

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4

Hungate, Robert W. "Adsorption kinetics for the removal of soluble manganese by oxide- coated filter media." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43861.

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This study was conducted to examine the kinetics of manganese sorption on oxide-coated filter media. Initial experimentation confirmed the findings of other investigators, the Mn2+ sorption capacity of oxide-coated media increases as solution pH increases. Further study revealed that uptake rate kinetics could be described by first order kinetics and also increased with increasing solution pH. The addition of free chlorine (HOCl) to solution greatly enhanced Mn2+ uptake rate kinetics. Later studies indicated that the oxide coating had very little impact on the physical properties of the media

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5

Ambjörnsson, Linn, Katti Ewald, Kling Erika Johansson, Anna Larsson, Selenius Marie, and Svedberg Elin. "Purification of arsenic contaminated water using ferrihydrite with consideration to current circumstances in Burkina Faso." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-295133.

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Ferrihydrite in a suspension has been studied as a solution for purification of arsenic contaminated water. Many development countries, amongst them Burkina Faso, have arsenic in their groundwater and the current methods for purification are too expensive. Measurements have shown extremely high levels of arsenic in the groundwater in several places in Burkina Faso. Since the availability of surface water is limited, the groundwater is still used as drinking water. A suspension of ferrihydrite has capacity to adsorb arsenic in water due to its chemical characteristics. Small-scale laboratory

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6

Rathnayake, Suramya I. "Synthesis, characterisation and application of inorganic-organic clays for water purification." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/104320/1/Rathnayake%20Mudiyanselage%20Suramya%20Indunil_Rathnayake_Thesis.pdf.

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This thesis reports a new remediation approach for the removal of toxic and high priority water pollutants based on the use of modified clays. Novel types of modified clays called inorganic-organic clays (IOCs) were synthesised and their structures and properties were characterised using various techniques. Adsorption behaviours and removal efficiencies of the IOCs towards both organic and inorganic water pollutants in Single and Binary Contaminants System were investigated. The work provides new insights into the structures, properties and potential environmental applications of IOCs in water

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7

Park, Yu Ri. "Synthesis, characterisation and application of organic surfactants modified clays for water purification." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/63494/1/Yu%20Ri_Park_Thesis.pdf.

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This thesis offered a step forward in the development of cheap and effective materials for water treatment. It described the modification of naturally abundant clay minerals with organic molecules, and used the modified clays as effective adsorbents for the removal of recalcitrant organic water pollutants. The outcome of the study greatly extended our understanding of the synthesis and characteristic properties of clay and modified clay minerals, provided optimistic evaluation of the modified clays for environmental remediation and offered potential utility for clay minerals in the industry an

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8

Lavinder, Steven Robert. "Evaluation of activated carbon processes for removing trihalomethane precursors from a surface water impoundment." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45820.

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<p>A pilot plant study was conducted in Newport News, Virginia to investigate the effectiveness of powdered activated carbon [PAC] and granular activated carbon [GAC], with and without preoxidation, for reducing trihalomethane [THM] precursor concentrations in Harwood's Mill Reservoir water. Preoxidation with ozone followed by GAC is referred to as the "biological activated carbonâ [BAC] process. This study showed that the GAC and BAC processes obtained the same level of organic removal; however, BAC would provide longer bed life and require less carbon than the GAC process. PAC treatm

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9

Hyung, Hoon. "Dispersion of fullerenes in natural water and their behavior in water treatment process." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24812.

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Thesis (Ph.D.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Jae-Hong Kim; Committee Member: Joseph hughes; Committee Member: Michael Bergin; Committee Member: Seung Soon Jang; Committee Member: Vernon Snoeyink.

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10

Hawley, Harmonie A. "TCE removal utilizing coupled zeolite sorption and advanced oxidation." Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-0428103-150434.

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11

Ogutverici, Abdullah. "Triclosan Removal By Nanofiltration From Surface Water." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615617/index.pdf.

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Nowadays, organic pollutants occurring in surface waters have raised substantial concern in public. Triclosan (TCS) is one of the antimicrobial agents which are utilized in both domestic and industrial application. In this study nanofiltration (NF) of TCS in surface water was investigated. Laboratory scale cross-flow device is operated in total recycle mode and DK-NF and DL-NF membranes were used. Kesikk&ouml<br>pr&uuml<br>Reservoir (Ankara) water was used as raw water. Effect of natural organic matter (NOM) content of raw water on TCS removal is searched through addition of humic acid (HA) in

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12

Sanyahumbi, Douglas. "Removal of lead from solution by the non-viable biomass of the water fern Azolla filiculoides." Thesis, Rhodes University, 1999. http://hdl.handle.net/10962/d1003960.

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The removal of lead from aqueous solution and lead-acid battery manufacturing waste-water by the non-viable biomass of the water fern Azolla filiculoides was investigated in both batch and column reactors. The maximum lead uptake by the Azolla biomass at a pH value of approximately 5, was found to be 100 mg lead/g biomass from aqueous solution. Lead removal varied from 30% of the initial lead concentration at pH 1.5 to approximately 95% at pH values of 3.5 and 5.6. Lead removal from aqueous solution decreased to 30% of the initial lead concentration if the lead concentration was initially over

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13

Bunhu, Tavengwa. "Preparation and evaluation of Lignocellulose-Montmorillonite nanocomposites for the adsorption of some heavy metals and organic dyes from aqueous solution." Thesis, University of Fort Hare, 2011. http://hdl.handle.net/10353/535.

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The need to reduce the cost of adsorption technology has led scientists to explore the use of many low cost adsorbents especially those from renewable resources. Lignocellulose and montmorillonite clay have been identified as potentially low cost and efficient adsorbent materials for the removal of toxic heavy metals and organic substances from contaminated water. Montmorillonite clay has good adsorption properties and the potential for ion exchange. Lignocellulose possesses many hydroxyl, carbonyl and phenyl groups and therefore, both montmorillonite and lignocellulose are good candidates for

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14

Salih, Ali Mohammed. "The purification of industrial wastewater to remove heavy metals and investigation into the use of zeolite as a remediation tool." Thesis, University of Wolverhampton, 2018. http://hdl.handle.net/2436/621859.

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Zeolites are well-known aluminosilicate minerals that have been widely used as adsorbents in separation, purification processes and environmental pollution control. Zeolites are used in various industrial applications due to their high cation-exchange ability, molecular sieve and cataltic properties. In order to reduce the costs of acquisition and minimise the disposal of adsorbents, both modified natural zeolite and synthetic zeolite (derived from kaolinite) were used for the purification of wastewater. The characteristic properties and applications of adsorbents are also discussed including

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15

Silva, Evanuzia Miranda da. "Obtenção, caracterização e utilização do carvão de serragem como adsorvente para purificação de água." Universidade Federal do Tocantins, 2018. http://hdl.handle.net/11612/1058.

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A serragem de madeira é um produto proveniente do uso da madeira, que pode ter aproveitamento econômico, transformando-se e agregando valor a cadeia produtiva da madeira. Uma de suas aplicações pode ser a produção de carvão e bio-óleo. O carvão ativado tem um custo elevado, porém é uma opção que apresenta potencial de adsorção e remoção de cianotoxinas e matéria orgânica presentes em água de abastecimento. O objetivo deste trabalho foi analisar a qualidade do carvão de serragem e seu potencial para ser aplicado em sistema de purificação de água, através de parâmetros físico/químicos. A serrage

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16

Meza, Maria I. "The use of PRBs (permeable reactive barriers) for attenuation of cadmium and hexavalent chromium from industrial contaminated soil." Muncie, Ind. : Ball State University, 2009. http://cardinalscholar.bsu.edu/432.

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17

Peres, Mariana Rodrigues. "Remoção dos interferentes endócrinos 17 'alfa'-etinilestradiol, 17 'beta'-estradiol e 4-nonilfenol por adsorção em carvão ativado em pó em água de abastecimento público." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258693.

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Orientador: Ricardo de Lima Isaac<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo<br>Made available in DSpace on 2018-08-18T23:00:14Z (GMT). No. of bitstreams: 1 Peres_MarianaRodrigues_M.pdf: 4938252 bytes, checksum: e65c217dee0ac585f070316b2ec3fbda (MD5) Previous issue date: 2011<br>Resumo: Nas últimas décadas, verifica-se um crescente interesse científico a respeito dos potenciais adversos associados à exposição humana e animal aos interferentes endócrinos. A ocorrência de interferentes endócrinos em efluente de Estação

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18

Santana, Pedro Manoel Araujo de. "Uso da Moringa oleifera lam. como biossorvente do cádmio em águas." Universidade Católica de Pernambuco, 2017. http://tede2.unicap.br:8080/handle/tede/934.

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Submitted by Biblioteca Central (biblioteca@unicap.br) on 2017-12-04T18:01:57Z No. of bitstreams: 1 pedro_manoel_araujo_santana.pdf: 1113895 bytes, checksum: aa89178214fa87d770781fc12019f31b (MD5)<br>Made available in DSpace on 2017-12-04T18:01:57Z (GMT). No. of bitstreams: 1 pedro_manoel_araujo_santana.pdf: 1113895 bytes, checksum: aa89178214fa87d770781fc12019f31b (MD5) Previous issue date: 2017-02-21<br>Industrial processes have historically been an important factor in environmental degradation. Improper disposal of industrial waste containing potentially toxic metals in water supplies

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19

Manipura, Walappuly Mudiyanselage Janakasiri Aruna Shantha Bandara. "Bioprocess development for removal of nitrogenous compounds from precious metal refinery wastewater." Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1007341.

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Removal of nitrogenous compounds from precious metal refinery (PMR) wastewater is important in terms of avoiding eutrophication (environmental protection), metal recovery (increased overall process efficiency and value recovery) and reuse of treated water (maximum use of natural resources). Extreme pH conditions (4 to 13 depending on the wastewater stream), high chemical oxygen demand (> 10,000 mg/I), numerous metals and high concentrations of those metals (> 20 mg/l of platinum group metals) in the wastewater are the main challenges for biological removal of nitrogenous compounds from PMR was

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20

Stoquart, Céline. "Performance of aged PAC suspensions in a hybrid membrane process for drinking water production." Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209254.

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Les procédés membranaires hybrides (PMH) allient la filtration membranaire basse pression à l’usage du charbon actif en poudre (CAP). Afin de diminuer les coûts opérationnels du procédé, il a été proposé de laisser vieillir le CAP dans le PMH et donc de minimiser le dosage de CAP frais. Peu d’information est disponible quant à la capacité résiduelle d’adsorption de suspensions de CAP âgées. L’importance relative de l’adsorption et de la biodégradation dans les réacteurs à CAP âgés sur le traitement des composés dissous est inconnue, ce qui empêche notamment l’optimisation du procédé. <p><p>Le

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21

Грайворонська, Інна Валерієвна, Инна Валерьевна Грайворонская та Inna Valeriievna Hraivoronska. "Обеспечение экологической безопасности при использовании металлургических шлаков в сорбционных технологиях очистки вод". Thesis, Харьковский нац. автомобильно-дорожный ун-т, 2014. http://essuir.sumdu.edu.ua/handle/123456789/37328.

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Дисертація присвячена вирішенню проблеми адсорбційної очистки промислових стічних вод від органічних сполук та виявленню ресурсної цінності металургійних шлаків з метою їх екологічно безпечного використання у виробництві сорбентів. Визначено елементний, оксидний, мінералогічний і радіонуклідний склад металургійних шлаків. Встановлено клас радіаційної небезпеки досліджених шлаків. Теоретично і експериментально обґрунтовано принципи визначення сорбційної активності металургійних шлаків. Визначено умови хімічної активації шлаку, природу функціональних груп, заряд і морфологічні особливості поверх

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22

Almeida, Aline Rafaela de. "Estudo da retenção da toxina de microcystis aeruginosa no bagaço de cana-de-açúcar e no carvão ativado." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1358.

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A crescente taxa de urbanização com descarga de esgoto sem tratamento prévio nos ecossistemas aquáticos e o aumento do uso de fertilizantes para desenvolvimento agrícola são causas da aceleração da floração de cianobactérias em águas de mananciais destinadas ao consumo humano. Cabe ao tratamento de água para abastecimento atender as especificações da legislação em relação à potabilidade necessitando remover as cianobactérias e suas toxinas. Este trabalho teve por objetivo estudar a utilização de bagaço de cana-de-açúcar in natura para adsorção de microcistina-LR da Microcystis aeruginosa em co

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23

Vijwani, Hema. "Hierarchical Porous Structures with Aligned Carbon Nanotubes as Efficient Adsorbents and Metal-Catalyst Supports." Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1433350549.

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24

Fourest, Eric. "Etude des mécanismes de biosorption des métaux lourds par des biomasses fongiques industrielles en vue d'un procédé d'épuration des effluents aqueux contaminés." Grenoble 1, 1993. http://www.theses.fr/1993GRE10142.

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Les micro-organismes etudies presentent a l'etat mort d'importantes capacites d'accumulation pour les cations metalliques en solution dans l'eau. La cinetique d'adsorption des metaux est controlee par leur diffusion dans les materiaux biosorbants. Avec rhizopus, 90% de l'adsorption se deroule en moins d'une heure. L'obtention de granules poreux et resistants de diametre moyen de 200 a 400 m offre les meilleures proprietes de transferts ioniques et de separabilite des particules solides. Des experiences d'adsorption du zinc, du nickel, du cadmium et du plomb en systeme ferme par r. Arrhizus mon

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25

Choo-Kun, Marlène. "Intégration de la méthanisation des boues dans une filière alternative de traitement des eaux usées basée sur le procédé A/B : Vers la station d’épuration à énergie positive." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0142/document.

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Depuis le début des années 2000, la station d’épuration n’est plus seulement perçue comme une installation industrielle traitant les eaux résiduaires urbaines afin d’en minimiser leurs impacts sur le milieu naturel, mais aussi comme un moyen de récupérer des ressources : eau, nutriments, énergie. Ce travail de thèse traite de cette dernière ressource, l’énergie. Comment tendre vers la station d’épuration auto-suffisante en énergie, voire encore productrice d’énergie sans en affecter l’efficacité de traitement? A l’aide d’une filière de traitement ancienne revisitée : le procédé A/B (Adsorption

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26

Carricondo, Antón Juan Manuel. "Utilización de residuos vegetales para la eliminación de fósforo en aguas residuales mediante procesos de adsorción." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/158614.

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[ES] La presente tesis doctoral tiene como objetivo la utilidad de restos vegetales de origen agrícola y no agrícola para la eliminación de fósforo de las aguas residuales, y con ello reducir la eutroficación del lago de l'Albufera de Valencia, en el este de España. Bajo el concepto de Economía Circular, la cual se basa en reducir la entrada de materiales y la generación de desechos en sistemas productivos, los restos vegetales son utilizados para la producción de energía renovable en plantas de biomasa, una vez incinerados en estas plantas los restos vegetales pasan a ser un residuo, la ceniz

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27

Hoppen, Mariana Irene. "Adsorção e dessorção do ácido acetilsalicílico em carvão ativado de casca de coco de babaçu in natura e funcionalizado com HNO3." Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/3020.

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A presença de fármacos em águas superficiais, subterrâneas, solo e efluentes tem gerado preocupações no que diz respeito à ineficiência dos tratamentos convencionais e os riscos ambientais associados ao descarte inadequado destes micropoluentes emergentes. Diante disto, o objetivo deste trabalho foi avaliar a adsorção e a dessorção de ácido acetilsalicílico (AAS) em solução aquosa em carvão ativado de babaçu in natura (CAB) e funcionalizado quimicamente com HNO3 (CAA). Foram determinados aos adsorventes os teores de cinzas, umidade e de material volátil, granulometria, análise elementar, aspec

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Zvinowanda, Caliphs M. "The utilisation of maize tassel as an adsorbent for the removal of heavy metals from aqueous solutions." Thesis, 2009. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000553.

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Thesis (DTech. degree in Environmental, Water & Earth Sciences)--Tshwane University of Technology, 2009.<br>The potential of tassel from R52 maize cultivar for the removal of heavy metals from simulated and environmental aqueous samples as well as the physicochemical characteristics of tassel were investigated. Milled tassel powder was employed in metal removal from simulated aqueous sample and thereafter, the developed method was applied to environmental samples. This research has demonstrated the potential of maize tassel to adsorb metal ions from both simulated and environmental samples. Fu

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"Polymeric nitrogen donor macro(meso)porous sorption materials for selected transition metals." Thesis, 2015. http://hdl.handle.net/10210/13835.

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Puka, Lesiba Raymond. "Fluoride adsorption modelling and the characterization of clays for defluoridation of natural waters." Thesis, 2008. http://hdl.handle.net/10210/413.

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High F- groundwaters occur in various parts of South Africa, namely, the larger part of the Karoo, Limpopo, North West and Northern Cape Provinces. The use of these waters for drinking purposes on continual basis can lead to fluorosis. Fluorosis is a debilitating disease caused by drinking water with F- concentrations higher than ca. 1 mg.L-1. The disease is characterized by mottled teeth in dental fluorosis and brittle bones in severe skeletal fluorosis. Solution to this problem involves the implementation of a method for F- removal from water. Defluoridation has become a widely practiced pro

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31

Tzu-Yang, Hsien. "Synthesis of porous, magnetic chitosan beads and application to cadmium ion adsorption." Thesis, 1992. http://hdl.handle.net/1957/36143.

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Lobanga, Kaluka Paul. "Natural organic matter removal from surface waters by enhanced coagulation, granular activated carbon adsorption and Ion exchange." Thesis, 2014. http://hdl.handle.net/10210/12109.

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M.Ing. (Civil Engineering)<br>Natural organic matter (NOM) is a complex mixture of organic compounds resulting from the decay of plants and animals. When not properly removed, NOM reacts with disinfectants to form disinfection by-products, of which some are known to be carcinogenic. Regulations have become more and more stringent about the maximum level of NOM in drinking water. Different water treatment processes can be applied to remove NOM. However, because each process targets specific fractions of NOM, this results in the existence of recalcitrant NOM fractions that are not removed, for e

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Tewari, Sanjay. "Regeneration of Carbon Aerogel Exhausted in Water Purification." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10562.

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Carbon has been used electrochemically in various forms for water treatment and the carbon aerogel is one of them. Carbon Aerogels (CA) are used as electrodes due to their high surface capacity and high electrical conductivity. They are also known as Carbon Nanofoams (CNF). CA electrodes attract oppositely charged ions that are nearby. This concept is known as Capacitive De-Ionization (CDI). The use of CA in CDI for water purification is well documented, but not much work has been done on regeneration of CA electrodes. Once saturated, these electrodes lose their ability to adsorb additional io

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34

Falayi, Thabo. "Absorption of heavy metals and neutralisation of acid mine drainage using clay minerals." Thesis, 2014. http://hdl.handle.net/10210/11027.

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35

Savant, Vivek. "Protein adsorption on chitosan-polyanion complexes : application to aqueous food processing wastes." Thesis, 2001. http://hdl.handle.net/1957/26560.

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Chitosan has been proposed as a "natural" coagulating agent to solve wastewater problems. The main hindrance in this commercial chitosan application has been its low cost effectiveness. The hypothesis in our research is that chitosan complexes with natural polyanions is more effective than chitosan alone, particularly in recovering low concentration proteins from food processing wastewater. Chitosan (Chi) was reacted with alginate (Alg), pectin (Pec) and carrageenan (Car) ex-situ to obtain chitosan-polyanion complexes (Chi-Pol). Analysis by Fourier Transform Infrared (FTER) spectroscopy confir

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36

Dlamini, Nonjabulo Prudence. "Micro-organisms for the removal of copper and cobalt from aqueous solutions." Thesis, 2010. http://hdl.handle.net/10210/3115.

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M.Sc.<br>Inorganic pollutants like heavy metals are some of the major water pollutants worldwide. They are toxic and in some cases carcinogenic even at low concentrations. Their removal from industrial aqueous solutions, wastewater and hydrometallurgical process solutions prior to their release to the environment is necessary for a healthy biosphere which includes human beings, aquatic life and plants. There are several technologies used to remove metals such as Cu, Co, Zn, Hg from water. These include among others, ion exchange, membrane filtration, activated carbon, electrochemical treatment

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Kanwar, Lalita. "Defluoridation Of Drinking Water Using Activated Alumina." Thesis, 2010. https://etd.iisc.ac.in/handle/2005/1991.

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Excess fluoride (F-) in drinking water poses a health threat to millions of people around the world. In the present work, activated alumina (AA) has been used as an adsorbent. Data obtained from batch experiments were fitted to the (i) pseudo-first order, (ii) pseudo-second order, and (iii) Langmuir kinetic model. Model (ii) performed better than model (i), and fitted the data well. However, the rate constant for adsorption ka had to be varied as a function of the initial concentration of F- in the liquid phase c0. A more satisfactory approach is provided by Langmuir model, which fitted the d

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38

Vilakati, Gcina Doctor. "Biodegradable polymer composites : synthesis, properties and application in water purification." Thesis, 2012. http://hdl.handle.net/10210/4672.

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M.Sc.<br>The addition of lignocellulosic fibres to thermoplastic polymers is known to increase the toughness of the polymers but it compromises the tensile strength. On the other hand, inorganic fillers like TiO2 are known to improve the tensile strength of polymers. These plant fibres have been used as adsorbents of metal pollutants in water. Best results were obtained when such materials were ground to fine powder but due to low density, the fibres float and form aggregates in water. Being highly biodegradable in nature makes plant fibres unsuitable for water treatment over lengthy periods o

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39

Yu, Yanjie. "Mesoporous Carbon Produced from Tri-constituent Mesoporous Carbon-silica Composite for Water Purification." Thesis, 2012. http://hdl.handle.net/10754/273073.

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Highly ordered mesoporous carbon-silica nanocomposites with interpenetrating carbon and silica networks were synthesized by the evaporation-induced tri-constituent co- assembly approach. The removal of silica by concentrated NaOH solution produced mesoporous carbons, which contained not only the primary large pores, but also the secondary mesopores in the carbon walls. The thus synthesized mesoporous carbon was further activated by using ZnCl2. The activated mesoporous carbon showed an improved surface area and pore volume. The synthesized mesoporous carbon was tested for diuron removal from w

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40

Muthui, Muliwa Anthony. "Magnetic adsorption separation process for industrial wastewater treatment using polypyrrole-magnetite nanocomposite." 2013. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001106.

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M.Tech. Engineering: Chemical.<br>Aims at demonstrating the application of semi-continuous and continuous magnetic adsorption separation (MAS) techniques to extract Cr (VI) ions from wastewater streams using PPy-Fe3O4 nanocomposite. Specifically, the research aims to achieve the following objectives: to design, synthesize and characterize new generation PPy-Fe3O4 nanocomposite with varied magnetite composition for hexavalent chromium removal ; to generate batch adsorption kinetic data in a continuously stirred tank reactor (CSTR) and apply existing kinetic models to aid in water treatment syst

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41

"Separation of chromium species and adsorption of arsenic on titanium dioxide." 2000. http://library.cuhk.edu.hk/record=b5890315.

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Wu Xiujuan.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2000.<br>Includes bibliographical references (leaves 88-93).<br>Abstracts in English and Chinese.<br>ABSTRACT (Chinese)<br>ABSTRACT<br>ACKNOWLEDGEMENT<br>TABLE OF CONTENTS<br>LIST OF TABLES<br>LIST OF FIGURES<br>Chapter CHAPTER ONE: --- INTRODUCTION<br>Chapter 1.1 --- General B ackground --- p.1<br>Chapter 1.2 --- Chromium in Environment and its Analysis --- p.2<br>Chapter 1.2.1 --- Source of Chromium and its Harmful Effects on Human --- p.2<br>Chapter 1.2.2 --- Methods for Separation and Determination of Chromium Species ---

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42

Leswifi, Taile Yvonne. "Removal of Lead, Fluoride and Chromium from water using Metal oxide nanostructured adsorption media." 2010. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001339.

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M. Tech. Chemical Engineering.<br>Discusses the application of nanotechnology process to offer wholesale benefits in water and wastewater treatment, extremely very few researches have been conducted in this field. Even with the few, studies have mainly focused on using single ion aqueous solution. Such approach is novel but the results may not give true picture of performance of nano-materials. It's known that water quality adversely affect sorption process. It's thus product to use real field water and wastewater to get valuable results. Presently, there is almost no information is open liter

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43

Mwangi, Isaac Waweru. "Functionalized synthetic-and bio-sorbents for removal of inorganic and organic contaminants in water." Thesis, 2013. http://hdl.handle.net/10210/8568.

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D.Phil. (Chemistry)<br>This thesis describes the improvement of sorption capacity and efficiency of synthetic and biological adsorbents towards selected pollutants by introducing functional groups on the sorbents. Functionalization was achieved by chemically modifying the binding sites of the studied adsorbents. The sorbent materials considered were chemical resins (Amberlite XAD 1180) and biomass (maize tassels and seaweed). The adsorbents were modified with ethylenediamine in order to improve their capacity for extraction of heavy metals, namely lead, copper and cadmium from water. For the r

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44

Olorundare, Oluwasayo Folasayo. "Activated carbon from maize tassels and polymer composites for water decontamination." Thesis, 2014. http://hdl.handle.net/10210/11380.

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Ph.D. (Chemistry)<br>This study presents work on the preparation, characterisation and application of agricultural waste residue, maize tassel in the production of activated carbon (AC) using both physical and chemical methods of activation in their production. The activated carbon produced from maize tassel (MTAC) or steam-produced activated carbon (STAC) were later added as a filler – together with beta-cyclodextrin (β-CD), and raw tassel (RT) – in the production of polyurethane composite adsorbent (PUCAD) material for the removal of selected inorganic (such as Cd2+, Cr3+, Pb2+) and organic

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45

Kanwar, Lalita. "Defluoridation Of Drinking Water Using Activated Alumina." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/1991.

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Excess fluoride (F-) in drinking water poses a health threat to millions of people around the world. In the present work, activated alumina (AA) has been used as an adsorbent. Data obtained from batch experiments were fitted to the (i) pseudo-first order, (ii) pseudo-second order, and (iii) Langmuir kinetic model. Model (ii) performed better than model (i), and fitted the data well. However, the rate constant for adsorption ka had to be varied as a function of the initial concentration of F- in the liquid phase c0. A more satisfactory approach is provided by Langmuir model, which fitted the d

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46

Mgwetyana, Unathi. "Recovery of base metals from nitric and sulphiric solutions using carbon nanotubes." Thesis, 2014. http://hdl.handle.net/10210/8861.

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M.Tech. (Extraction Metallurgy)<br>For many decades, carbon nanotubes (CNTs) have been used as adsorbents for the removal of pollutants from wastewaters because of their unique properties such as inert surface, resistance to acid and base environment, rigidity and strength. Herein is a report of application of functionalised CNTs on the adsorption of metal ions from aqueous solutions and mine leachates. The CNTs were first synthesised in-house, purified, functionalised and characterised with various characterisation techniques: FTIR (Fourier Transform Infrared), SEM (Scanning Electron Microsco

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47

Nyembe, Dumsile W. "Natural clinoptilolite for the removal of cobalt and copper from aqueous solutions." Thesis, 2011. http://hdl.handle.net/10210/3593.

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M.Sc.<br>The metallurgical industrial losses of base metals with waste solutions are an environmental threat to water sources, hence these metal ions must be removed prior to discharge into receiving bodies. In this study, Southern African clinoptilolite’s capability as an ion-exchanger with respect to Cu2+ and Co2+ was investigated in order to consider its application in metal cation removal from aqueous solutions. The clinoptilolite was characterised with X-ray powder diffraction (XRD), X-ray fluorescence (XRF), FTIR, thermogravimetric analyser (TGA) and SEM-EDS. The clinoptilolite was found

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48

Ntamo, Sihlangule Abenathi. "Sorptive removal of antibiotics from water using surfactant modified Zeolite." 2013. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001109.

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M. Tech. Engineering: Chemical.<br>Focuses on the emerging application of clinoptilolite in removing aspirin and cephalexin from municipal wastewater streams. The mechanisms of sorbent-organic compounds interaction was studied in detail. Specifically, this research aims to achieve the following objectives: I. to investigate the sorption capacity of surfactant modified clinoptilolite on the removal of aspirin and cephalexin ; II. To relate sorbents performance to process variables with sorbent properties and water quality ; III. to compare the sorption capacity of surfactant modified clinoptilo

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49

Sekhula, Mahlatse Mapula. "The use of maize tassel as a solid phase extraction sorbent for the recovery of copper, gold and silver from aqueous solution." 2011. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000465.

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M. Tech. Environmental Management<br>Investigates the possibility of using maize tassel powder as a solid phase extraction sorbent for the recovery of Ag, Au and Cu from aqueous solution. The surface characteristics of maize tassel and its ability to remove Ag, Au and Cu from aqueous solutions needed to be established before the preparation of maize tassel beads.

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50

Dlamini, Thulani. "Development of a small scale water treatment system for fluoride removal for rural areas." Thesis, 2015. http://hdl.handle.net/10321/1366.

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Submitted in fulfillment of the requirements for the degree of Master of Engineering in Chemical Engineering, Durban University of Technology. Durban. South Africa, 2015.<br>Several areas in the world such as the United States of America, Sri Lanka, China, Argentina, Canada, Tanzania, Kenya, South Africa and many others have a problem of high fluoride content in drinking water. Generally fluoride levels above 1.5 ppm in water may result in dental and skeletal fluorosis in humans depending on quantity consumed (Fan et al., 2003; Meenakshi, 2004). Remote rural areas where there are no water trea

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