Thermodynamic and kinetic studies of cadmium adsorption from aqueous solution onto rice husk
Autor(a) principal: | |
---|---|
Data de Publicação: | 2010 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Brazilian Journal of Chemical Engineering |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322010000200013 |
Resumo: | The adsorption behavior of rice husk for cadmium ions from aqueous solutions has been investigated as a function of appropriate equilibrium time, adsorbent dose, temperature, adsorbate concentrations and pH in a batch system. Studies showed that the pH of aqueous solutions affected cadmium removal with the result that removal efficiency increased with increasing solution pH. The maximum adsorption was 98.65% at solution pH 6, contact time 60 min and initial concentration of 25 mg/L. The experimental data were analysed by the Langmuir, Freundlich and Temkin models of adsorption. The characteristic parameters for each isotherm and related correlation coefficients have been determined. Thermodynamic parameters such as<img src="/img/revistas/bjce/v27n2/a13text1.jpg">, <img src="/img/revistas/bjce/v27n2/a13text2.jpg"> and <img src="/img/revistas/bjce/v27n2/a13text3.jpg">have also been evaluated and it has been found that the sorption process was feasible, spontaneous and exothermic in nature. The kinetics of the sorption were analysed using the pseudo-first order and pseudo-second order kinetic models. Kinetic parameters, rate constants, equilibrium sorption capacities and related correlation coefficients for each kinetic model were calculated and discussed. It was shown that the adsorption of cadmium could be described by the pseudo-second order equation, suggesting that the adsorption process is presumably a chemisorption. The rice husk investigated in this study showed good potential for the removal of cadmium from aqueous solutions. The goal for this work is to develop inexpensive, highly available, effective metal ion adsorbents from natural waste as alternative to existing commercial adsorbents. |
id |
ABEQ-1_f2cc1c51ebb7387001590bf92501c509 |
---|---|
oai_identifier_str |
oai:scielo:S0104-66322010000200013 |
network_acronym_str |
ABEQ-1 |
network_name_str |
Brazilian Journal of Chemical Engineering |
repository_id_str |
|
spelling |
Thermodynamic and kinetic studies of cadmium adsorption from aqueous solution onto rice huskRice huskCadmiumKineticsIsothermsThermodynamicsThe adsorption behavior of rice husk for cadmium ions from aqueous solutions has been investigated as a function of appropriate equilibrium time, adsorbent dose, temperature, adsorbate concentrations and pH in a batch system. Studies showed that the pH of aqueous solutions affected cadmium removal with the result that removal efficiency increased with increasing solution pH. The maximum adsorption was 98.65% at solution pH 6, contact time 60 min and initial concentration of 25 mg/L. The experimental data were analysed by the Langmuir, Freundlich and Temkin models of adsorption. The characteristic parameters for each isotherm and related correlation coefficients have been determined. Thermodynamic parameters such as<img src="/img/revistas/bjce/v27n2/a13text1.jpg">, <img src="/img/revistas/bjce/v27n2/a13text2.jpg"> and <img src="/img/revistas/bjce/v27n2/a13text3.jpg">have also been evaluated and it has been found that the sorption process was feasible, spontaneous and exothermic in nature. The kinetics of the sorption were analysed using the pseudo-first order and pseudo-second order kinetic models. Kinetic parameters, rate constants, equilibrium sorption capacities and related correlation coefficients for each kinetic model were calculated and discussed. It was shown that the adsorption of cadmium could be described by the pseudo-second order equation, suggesting that the adsorption process is presumably a chemisorption. The rice husk investigated in this study showed good potential for the removal of cadmium from aqueous solutions. The goal for this work is to develop inexpensive, highly available, effective metal ion adsorbents from natural waste as alternative to existing commercial adsorbents.Brazilian Society of Chemical Engineering2010-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322010000200013Brazilian Journal of Chemical Engineering v.27 n.2 2010reponame:Brazilian Journal of Chemical Engineeringinstname:Associação Brasileira de Engenharia Química (ABEQ)instacron:ABEQ10.1590/S0104-66322010000200013info:eu-repo/semantics/openAccessKumar,P. SenthilRamakrishnan,K.Kirupha,S. DineshSivanesan,S.eng2010-08-19T00:00:00Zoai:scielo:S0104-66322010000200013Revistahttps://www.scielo.br/j/bjce/https://old.scielo.br/oai/scielo-oai.phprgiudici@usp.br||rgiudici@usp.br1678-43830104-6632opendoar:2010-08-19T00:00Brazilian Journal of Chemical Engineering - Associação Brasileira de Engenharia Química (ABEQ)false |
dc.title.none.fl_str_mv |
Thermodynamic and kinetic studies of cadmium adsorption from aqueous solution onto rice husk |
title |
Thermodynamic and kinetic studies of cadmium adsorption from aqueous solution onto rice husk |
spellingShingle |
Thermodynamic and kinetic studies of cadmium adsorption from aqueous solution onto rice husk Kumar,P. Senthil Rice husk Cadmium Kinetics Isotherms Thermodynamics |
title_short |
Thermodynamic and kinetic studies of cadmium adsorption from aqueous solution onto rice husk |
title_full |
Thermodynamic and kinetic studies of cadmium adsorption from aqueous solution onto rice husk |
title_fullStr |
Thermodynamic and kinetic studies of cadmium adsorption from aqueous solution onto rice husk |
title_full_unstemmed |
Thermodynamic and kinetic studies of cadmium adsorption from aqueous solution onto rice husk |
title_sort |
Thermodynamic and kinetic studies of cadmium adsorption from aqueous solution onto rice husk |
author |
Kumar,P. Senthil |
author_facet |
Kumar,P. Senthil Ramakrishnan,K. Kirupha,S. Dinesh Sivanesan,S. |
author_role |
author |
author2 |
Ramakrishnan,K. Kirupha,S. Dinesh Sivanesan,S. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Kumar,P. Senthil Ramakrishnan,K. Kirupha,S. Dinesh Sivanesan,S. |
dc.subject.por.fl_str_mv |
Rice husk Cadmium Kinetics Isotherms Thermodynamics |
topic |
Rice husk Cadmium Kinetics Isotherms Thermodynamics |
description |
The adsorption behavior of rice husk for cadmium ions from aqueous solutions has been investigated as a function of appropriate equilibrium time, adsorbent dose, temperature, adsorbate concentrations and pH in a batch system. Studies showed that the pH of aqueous solutions affected cadmium removal with the result that removal efficiency increased with increasing solution pH. The maximum adsorption was 98.65% at solution pH 6, contact time 60 min and initial concentration of 25 mg/L. The experimental data were analysed by the Langmuir, Freundlich and Temkin models of adsorption. The characteristic parameters for each isotherm and related correlation coefficients have been determined. Thermodynamic parameters such as<img src="/img/revistas/bjce/v27n2/a13text1.jpg">, <img src="/img/revistas/bjce/v27n2/a13text2.jpg"> and <img src="/img/revistas/bjce/v27n2/a13text3.jpg">have also been evaluated and it has been found that the sorption process was feasible, spontaneous and exothermic in nature. The kinetics of the sorption were analysed using the pseudo-first order and pseudo-second order kinetic models. Kinetic parameters, rate constants, equilibrium sorption capacities and related correlation coefficients for each kinetic model were calculated and discussed. It was shown that the adsorption of cadmium could be described by the pseudo-second order equation, suggesting that the adsorption process is presumably a chemisorption. The rice husk investigated in this study showed good potential for the removal of cadmium from aqueous solutions. The goal for this work is to develop inexpensive, highly available, effective metal ion adsorbents from natural waste as alternative to existing commercial adsorbents. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-06-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322010000200013 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322010000200013 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0104-66322010000200013 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Brazilian Society of Chemical Engineering |
publisher.none.fl_str_mv |
Brazilian Society of Chemical Engineering |
dc.source.none.fl_str_mv |
Brazilian Journal of Chemical Engineering v.27 n.2 2010 reponame:Brazilian Journal of Chemical Engineering instname:Associação Brasileira de Engenharia Química (ABEQ) instacron:ABEQ |
instname_str |
Associação Brasileira de Engenharia Química (ABEQ) |
instacron_str |
ABEQ |
institution |
ABEQ |
reponame_str |
Brazilian Journal of Chemical Engineering |
collection |
Brazilian Journal of Chemical Engineering |
repository.name.fl_str_mv |
Brazilian Journal of Chemical Engineering - Associação Brasileira de Engenharia Química (ABEQ) |
repository.mail.fl_str_mv |
rgiudici@usp.br||rgiudici@usp.br |
_version_ |
1754213173120991232 |