Determination of the equilibrium, kinetic and thermodynamic parameters of adsorption of copper(II) ions onto seeds of

Özcan, Adnan; Tunalı, Sibel; Akar, Tamer; Kıran, İsmail

doi:10.1016/j.jhazmat.2005.05.007

Cited by 281 publications

(144 citation statements)

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“…These methods suffer from disadvantages such as high reagent and energy requirements, incomplete metal removal, and generation of large quantity of toxic waste sludge [6,7]. However, these technologies are most suitable in situations where the concentrations of heavy metal ions are relatively high.…”

Section: Introductionmentioning

confidence: 99%

Influence of Temperature on Equilibrium, Kinetic and Thermodynamic Parameters of Biosorption of Cr(VI) onto Fish Scales as Suitable Biosorbent

Kondapalli¹,

Mohanty²

2011

JWARP

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In this work the potential of fish scales as a suitable biosorbent for removal of Cr(VI) ions from aqueous solutions was investigated at various temperatures. The influence of temperature on equilibrium, kinetics as well as thermodynamic parameters was investigated. Various isotherm models such as Langmuir, Freundlich, R -P, D -R, Temkin and Halsey were used for the mathematical description of the biosorption of Cr(VI) ions onto fish scales. It was observed that Freundlich model exhibited the best fit to experimental data.Amongst the various kinetic models tested, the pseudo-first-order kinetic model represented the best correlation for the biosorption of Cr(VI) onto fish scales at various temperatures. In addition, various thermodynamic parameters such as ∆G o , ∆H o and ∆S o were also determined. The biosorption of Cr(VI) was found to be a spontaneous and endothermic process.

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Section: Introductionmentioning

confidence: 99%

Influence of Temperature on Equilibrium, Kinetic and Thermodynamic Parameters of Biosorption of Cr(VI) onto Fish Scales as Suitable Biosorbent

Kondapalli¹,

Mohanty²

2011

JWARP

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“…Hence, it is of great practical interest to develop effective technologies to remove Cu 2+ . Many methods, such as chemical precipitation, ion exchange, reverse osmosis, and adsorption, have been employed to remove Cu 2+ from solutions (Kim et al, 2008;Liu et al, 2006;Özcan et al, 2005). Among these methods, adsorption, being combined with appropriate desorption step, is an effective and versatile method and can avoid the disposal of large scale sludge.…”

Section: Introductionmentioning

confidence: 99%

Preparation of organically functionalized silica gel as adsorbent for copper ion adsorption

Wang

Kang

Liu

et al. 2009

Journal of Environmental Sciences

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A novel adsorbent (AMPS-silica) was synthesized by bounding AMPS (2-acrylamido-2-methylpropanesulfonic acid) onto silica surface, which functioned with γ-methacryloxypropyltrimethoxysilane reagent. The adsorbent was characterized by nitrogen adsorption/desorption measurement, thermogravimetric analysis (TGA) and potentiometric titration analysis. The TGA result indicated that the surface modification reactions introduced some organic functional groups onto the surface of silica. The surface area of AMPSsilica was 389.7 m 2 /g. The adsorbent was examined for copper ion removal in series of batch adsorption experiments. Results showed that the adsorption of Cu 2+ onto AMPS-silica was pH dependent, and the adsorption capacity increased with increasing pH from 2 to 6. The adsorption kinetics showed that Cu 2+ adsorption was fast and the data fitted well with a pseudo second-order kinetic model. The adsorption of Cu 2+ onto AMPS-silica obeyed both Freundlich and Langmuir isotherms, with r 2 = 0.993 and r 2 = 0.984, respectively. The maximum Cu 2+ adsorption capacity was 19.9 mg/g. The involved mechanism might be the adsorption through metal binding with organic functional groups such as carboxyl, amino and sulfonic groups. Cu 2+ loaded on AMPS-silica could be desorbed in HNO 3 solution, and the adsorption properties remain stable after three adsorption-desorption cycles.

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“…Baseando-se no modelo de Dubinin-Radushkevich, a vizinhança da superfície do sólido é caracterizada por uma série de equipotenciais superficiais tendo o mesmo potencial de sorção. [34][35][36][37] A isoterma é similar ao modelo de Langmuir, mas não assume superfície homogênea ou energia potencial constante. A isoterma de Dubinin-Radushkevich pode ser representada pela equação (4) onde q e é a quantidade de soluto adsorvido em (mol g A isoterma indica que a quantidade adsorvida aumenta com a concentração de equilíbrio do corante na solução, devido à saturação progressiva da monocamada para os dois sistemas estudados.…”

Section: Isotermas De Adsorçãounclassified

Cloreto de n-(2-hidroxil) propil-3-trimetil amônio quitosana como adsorvente de corantes reativos em solução aquosa

Fávere¹,

Riella²,

Rosa

2010

Quím. Nova

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Recebido em 30/9/09; aceito em 20/3/10; publicado na web em 9/8/10 CHITOSAN-N-2-HYDROXYPROPYL TRIMETHYL AMMONIUM CHLORIDE AS ADSORBENT FOR THE REMOVAL OF THE REACTIVE DYE FROM AQUEOUS SOLUTIONS. The quaternary chitosan was synthesized by reaction of chitosan with glycidyl trimethylammonium chloride. it was characterized by infrared spectra and conductometric titration. Adsorption of reactive blue 4 (RB4) and reactive red 120 (RR120) by quaternary chitosan was studied from aqueous medium. Two kinetic adsorption models were tested: pseudo first-order and pseudo second-order. The experimental data best fitted the pseudo second-order model. The Langmuir isotherm model provided the best fit to the equilibrium data in the concentration range investigated and the maximum adsorption capacity determined was 415 mg (RR120) and 637 mg (RB4) of reactive dye per gram of adsorbent.Keywords: reactive dye; quaternary chitosan; adsorption. INTRODUÇÃOA água é um recurso natural essencial aos processos bioquími-cos dos seres vivos e representa um fator importante nas atividades industriais de vários bens de consumo. O seu uso de forma racional, evitando o desperdício e a poluição não deveria ser motivo de preocupação somente aos ambientalistas, mas também, para as instituições governamentais e para o processo produtivo, pois 1/6 da população mundial não tem acesso à água potável. 1 Algumas formas de amenizar o problema da inevitável escassez da água seriam reduzir a poluição causada pelo processo industrial através do tratamento de seus efluentes, bem como, a implantação de projetos de reuso da água, desse modo, recuperando insumos e subprodutos. 1Há de se referir que as indústrias têxteis consomem um volume significativo de água no processo de tingimentos das fibras e tais águas são altamente coloridas devido à presença de corantes que não se fixam na fibra durante o processo de tingimento, com isso podendo afetar o processo de fotossíntese em virtude da diminuição da transparência da água, o que dificulta a entrada dos raios solares. 2,3Embora muitas moléculas orgânicas sejam degradadas, outras tantas são estáveis e, em função da sua estrutura química complexa, não são totalmente degradadas. 4 Os corantes sintéticos são, na maioria, xenobióticos, ou seja, os micro-organismos presentes em rios e lagos não contêm enzimas específicas para degradação deste tipo de composto sob condições aeróbicas; sendo que sob condições anaeró-bicas, a degradação do corante se processa muito lentamente.5 Além desse fato, estudos têm mostrado que algumas classes de corantes, principalmente azocorantes e seus subprodutos, podem ser carcinogênicos e/ou mutagênicos e, portanto, podendo causar toxidade aos organismos aquáticos. 3,6,7 O tratamento convencional dos efluentes têxteis envolve um processo físico-químico de coagulação/floculação. O sistema apresenta uma eficiência relativamente alta, o qual pode ser utilizado isoladamente ou combinado com o tratamento biológico, assim promovendo uma elevada remoção da cor de efluentes de indústrias têxteis. [...

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Determination of the equilibrium, kinetic and thermodynamic parameters of adsorption of copper(II) ions onto seeds of

Cited by 281 publications

References 40 publications

Influence of Temperature on Equilibrium, Kinetic and Thermodynamic Parameters of Biosorption of Cr(VI) onto Fish Scales as Suitable Biosorbent

Influence of Temperature on Equilibrium, Kinetic and Thermodynamic Parameters of Biosorption of Cr(VI) onto Fish Scales as Suitable Biosorbent

Preparation of organically functionalized silica gel as adsorbent for copper ion adsorption

Cloreto de n-(2-hidroxil) propil-3-trimetil amônio quitosana como adsorvente de corantes reativos em solução aquosa

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