Adsorption of heavy metal ions from aqueous solution by carboxylated cellulose nanocrystals

被引：307

作者：

Yu, Xiaolin ^{[1
]}

Tong, Shengrui ^{[1
]}

Ge, Maofa ^{[1
]}

Wu, Lingyan ^{[1
]}

Zuo, Junchao ^{[1
]}

Cao, Changyan ^{[2
]}

Song, Weiguo ^{[2
]}

机构：

[1] Chinese Acad Sci, Inst Chem, State Key Lab Struct Chem Unstable & Stable Speci, Beijing Natl Lab Mol Sci, Being 100190, Peoples R China

[2] Chinese Acad Sci, Inst Chem, Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China

来源：

JOURNAL OF ENVIRONMENTAL SCIENCES | 2013年 / 25卷 / 05期

关键词：

cellulose nanocrystals; adsorption; isotherms; regeneration; REMOVAL; BIOSORPTION; PB(II); LEAD; ALGINATE; SORPTION; CADMIUM; CU(II); EQUILIBRIUM; SORBENT;

D O I：

10.1016/S1001-0742(12)60145-4

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A novel nanoadsorbent for the removal of heavy metal ions is reported. Cotton was first hydrolyzed to obtain cellulose nanocrystals (CNCs). CNCs were then chemically modified with succinic anhydride to obtain SCNCs. The sodic nanoadsorbent (NaSCNCs) was further prepared by treatment of SCNCs with saturated NaHCO3 aqueous solution. Batch experiments were carried out with SCNCs and NaSCNCs for the removal of Pb2+ and Cd2+. The effects of contact time, pH, initial adsorption concentration, coexisting ions and the regeneration performance were investigated. Kinetic studies showed that the adsorption equilibrium time of Pb2+ and Cd2+ was reached within 150 min on SCNCs and 5 ruin on NaSCNCs. The adsorption capacities of Pb2+ and Cd2+ on SCNCs and NaSCNCs increased with increasing pH. The adsorption isotherm was well fitted by the Langmuir model. The maximum adsorption capacities of SCNCs and NaSCNCs for Pb2+ and Cd2+ were 367.6 mg/g, 259.7 mg/g and 465.1 mg/g, 344.8 mg/g, respectively. SCNCs and NaSCNCs showed high selectivity and interference resistance from coexisting ions for the adsorption of Pb2+. NaSCNCs could be efficiently regenerated with a mild saturated NaCl solution with no loss of capacity after two recycles. The adsorption mechanisms of SCNCs and NaSCNCs were discussed.

引用

页码：933 / 943

页数：11

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