Untreated Chinese ephedra residue as biosorbents for the removal of Pb2+ ions from aqueous solutions

被引：4

作者：

Feng, Ningchuan ^{[1
]}

Zhang, Fengyuan ^{[1
]}

机构：

[1] Ningxia Med Univ, Sch Basic Med Sci, Yinchuan 750004, Peoples R China

来源：

2013 INTERNATIONAL SYMPOSIUM ON ENVIRONMENTAL SCIENCE AND TECHNOLOGY (2013 ISEST) | 2013年 / 18卷

关键词：

Ephedria residue; Pb2+ ions; Biosorption; Isotherms; Kinetics; LOW-COST BIOSORBENT; HEAVY-METALS; ADSORPTION; BIOSORPTION; EQUILIBRIUM; KINETICS; PB(II); CARBON;

D O I：

10.1016/j.proenv.2013.04.107

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The objective of this work was to propose an alternative use for ephedra residue (ER) as untreated biosorbents for the removal of Pb2+ ions from aqueous solutions. Biosorption studies were conducted as a function of the solution pH, contact time and initial metal ion concentration. The biosorption kinetics was determined by fitting second-order kinetic models to the experimental data, being described by the pseudo-second-order model (R-2 > 0.99). Both Langmuir and Freundlich sorption models fit the experimental sorption equilibrium data, with Langmuir providing the best fit (R-2 > 0.97). According to the Langmuir equation, the maximum uptake capacity for Pb2+ ions was 1.0 mmol/g at 298K. A comparison of the maximum sorption capacity of several untreated biomaterial-based residues showed that the ER is a suitable candidate for use as biosorbents in the removal of Pb2+ ions from aqueous solutions. (C) 2013 The Authors. Published by Elsevier B.V.

引用

页码：794 / 799

页数：6

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