Biosorptive behaviour of casein for Zn2+, Hg2+ and Cr3+:: Effects of physico-chemical treatments

被引：53

作者：

Mishra, SP ^{[1
]}

Tiwari, D

Dubey, RS

Mishra, M

机构：

[1] Banaras Hindu Univ, Fac Sci, Dept Chem, Nucl & Radiochem Lab, Varanasi 221005, Uttar Pradesh, India

[2] Banaras Hindu Univ, Fac Sci, Dept Biochem, Varanasi 221005, Uttar Pradesh, India

来源：

BIORESOURCE TECHNOLOGY | 1998年 / 63卷 / 01期

关键词：

Biosorption; heavy metals; casein; Freundlich isotherm; temperature; desorption; pH;

D O I：

10.1016/S0960-8524(97)00110-7

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

The uptake behaviour of milk protein (casein) for some heavy metal toxic ions [Zn2+, Hg2+ and Cr3+] was investigated by employing the 'radiotracer technique'. The effects of various physico-chemical treatments were investigated in order to explain the sequestering behaviour of this biomass. In a single batch equilibrium experiment a decrease in adsorptive concentration (10(-2)-10(-8) mol L-1) and increase in temperature (293-323 K) and pH (ca 3-10) specifically increased the uptake of the metal ions. The uptake followed a first-order rate law and obeyed the Freundlich isotherm. Changes in standard enthalpy and activation energy involved during the biosorption were deduced for these systems. Also, desorption experiments showed that no significant desorption took place. (C) 1998 Elsevier Science Ltd.

引用

页码：1 / 5

页数：5

共 23 条

[1] ADSORPTION OF COPPER AND CHROMIUM BY ASPERGILLUS-CARBONARIUS [J].