Biosorption of cadmium metal ion from simulated wastewaters using Hypnea valentiae biomass: A kinetic and thermodynamic study

被引：145

作者：

Aravindhan, Rathinam ^{[1
]}

Maharshi, Bhaswant ^{[1
]}

Sreeram, Kalarical Janardhanan ^{[1
]}

Rao, Jonnalagadda Raghava ^{[1
]}

Nair, Balachandran Unni ^{[1
]}

机构：

[1] Cent Leather Res Inst, Chem Lab, Madras 600020, Tamil Nadu, India

来源：

BIORESOURCE TECHNOLOGY | 2010年 / 101卷 / 05期

关键词：

Biosorption; Cadmium; Hypnea valentia; Kinetics; Thermodynamics; LOW-COST ADSORBENTS; HEAVY-METALS; AQUEOUS-SOLUTIONS; WASTE-WATER; ADSORPTION; CHROMIUM; REMOVAL; BROWN; DYE; EQUILIBRIUM;

D O I：

10.1016/j.biortech.2009.08.008

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Present study deals with the evaluation of biosorptive removal of cadmium by red macro alga Hypnea valentiae. Experiments have been carried out to find the effect of various parameters such as initial cadmium concentration, experimental pH and temperature on the biosorption potential of H. valentiae. Optimum pH for biosorption of cadmium was found to be 6 +/- 0.3. A maximum removal of about 17 mg of cadmium per g of micro algae was observed at pH 6.0 for 250 mg L-1 solution of cadmium. Kinetics of cadmium biosorption by H. valentiae biomass is better described by pseudo first order kinetic model. The equilibrium isotherm data are very well represented by Langmuir isotherm equation, which confirmed the monolayer coverage of cadmium onto H. valentiae biomass. Various thermodynamic parameters such as change in enthalpy, free energy and entropy were estimated. It was also clearly observed that the presence of neutral salts and other metal ions affected the cadmium uptake behavior of the biomass considerably. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：1466 / 1470

页数：5

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