Adsorption of lead ions from aqueous solutions by citric acid-modified celluloses

被引：10

作者：

Kuo, Chao-Yin ^{[1
]}

Wu, Chung-Hsin ^{[2
]}

Chen, Meng-Jia ^{[3
]}

机构：

[1] Natl Yunlin Univ Sci & Technol, Dept Environm & Safety Engn, Yunlin, Taiwan

[2] Natl Kaohsiung Univ Appl Sci, Dept Chem & Mat Engn, Kaohsiung 807, Taiwan

[3] Da Yeh Univ, Dept Environm Engn, Da Tsuen, Chang Hua, Taiwan

来源：

DESALINATION AND WATER TREATMENT | 2015年 / 55卷 / 05期

关键词：

Adsorption; Citric acid; Cellulose; Lead ions; Isotherm; Kinetics; Thermodynamics; HEAVY-METALS; REMOVAL; SORPTION; CADMIUM; KINETICS; ZINC; HULL; DYES;

D O I：

10.1080/19443994.2014.926460

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

In this study, citric acid was utilized to modify the surface of cellulose and the citric acid-modified cellulose (CAMC) was then used to remove Pb2+ from aquatic solutions. The surface characteristics of CAMC were determined by Fourier-transform infrared spectroscopy and zeta potential analyses. The exact effects of CAMC dosage, pH, and temperature on the adsorption of Pb2+ by CAMC were determined. After 180min of reaction, the adsorption percentages of Pb2+ at 0.5, 1.5, and 2.5g/L CAMC were 66, 87, and 94%, respectively. The Pb2+ removal efficiency of CAMC increased with CAMC dosage, pH, and temperature. Experimental results reveal that the pseudo-second-order model best represents the adsorption kinetics. The Freundlich model fits the experimental isotherms better than does the Langmuir model. H degrees and S degrees were 43.34kJ/mol and 224.4J/molK, respectively. The value of H degrees suggested that the Pb2+ was adsorbed onto CAMC via physisorption.

引用

页码：1264 / 1270

页数：7

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