Magnetic natural composite Fe3O4-chitosan@bentonite for removal of heavy metals from acid mine drainage

被引：123

作者：

Feng, Guorui ^{[1
]}

Ma, Jianchao ^{[1
]}

Zhang, Xiaopeng ^{[1
]}

Zhang, Qingfang ^{[2
]}

Xiao, Yuqiang ^{[1
]}

Ma, Qingliang ^{[3
]}

Wang, Shaobin ^{[4
]}

机构：

[1] Taiyuan Univ Technol, Coll Min Technol, Taiyuan 030024, Shanxi, Peoples R China

[2] Taiyuan Univ Technol, Sch Chem & Chem Engn, Taiyuan 030024, Shanxi, Peoples R China

[3] Taiyuan Univ Technol, Key Lab Coal Sci & Technol, Minist Educ, Taiyuan 030024, Shanxi, Peoples R China

[4] Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2019年 / 538卷

基金：

中国国家自然科学基金;

关键词：

Fe3O4-chitosan@bentonite; Acid mine drainage; Cr(VI) adsorption; Heavy metals; AQUEOUS-SOLUTION; ADSORPTIVE REMOVAL; ACTIVATED CARBON; CR(VI); BENTONITE; CHITOSAN; CHROMIUM; IONS; NANOPARTICLES; ISOTHERM;

D O I：

10.1016/j.jcis.2018.11.087

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Magnetic Fe3O4-chitosan@bentonite (Fe3O4-CS@BT) composites using natural materials were synthesized and used to remediate acid mine drainage (AMD) for heavy metal removal. It was found that the composites had a good magnetism, high stability and good performance in removal of Cr(VI) in the synthetic aqueous solutions. The thermodynamic parameters showed that Cr(VI) adsorption onto Fe3O4-CS@BT was an exothermic and spontaneous process. The adsorption kinetics was well described by a pseudo-second-order model, and the adsorption isotherms fit the Langmuir model with a maximum adsorption capacity of 62.1 mg/g at 25 degrees C. Solution pH was a key factor for adsorption and the optimized pH was 2.0. Fe3O4-CS@BT could be easily recycled through an external magnetic field and the adsorption capacity reduced by only 3% after five consecutive adsorption-desorption processes. In addition, Fe3O4-CS@BT was found to be an excellent adsorbent for actual AMD remediation containing Cd, Cr, Cu, Fe Zn, Ni and Pb, suggesting that the Fe3O4-CS@BT was an effective and economical adsorbent for the treatment of AMD. (C) 2018 Elsevier Inc. All rights reserved.

引用

页码：132 / 141

页数：10