A novel magnetic biochar/MgFe-layered double hydroxides composite removing Pb2+ from aqueous solution: Isotherms, kinetics and thermodynamics

被引：159

作者：

Jia, Yang ^{[1
]}

Zhang, Yingshuang ^{[1
]}

Fu, Jiangang ^{[1
]}

Yuan, Liangxiao ^{[1
]}

Li, Zheng ^{[1
]}

Liu, Chang ^{[1
]}

Zhao, Di ^{[1
]}

Wang, Xiaobo ^{[1
]}

机构：

[1] Cent South Univ, Sch Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2019年 / 567卷

关键词：

Biochar; Double-layer hydroxides; Lead; Isotherms; Kinetics; Thermodynamics; HEAVY-METAL POLLUTION; ADSORPTION-KINETICS; CINNAMOMUM-CAMPHORA; ENHANCED ADSORPTION; EFFICIENT REMOVAL; PB(II) SORPTION; METHYLENE-BLUE; WASTE-WATER; IONS; LEAD;

D O I：

10.1016/j.colsurfa.2019.01.064

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：

An absorbent, magnetic biochar supporting MgFe-Layered double hydroxides (MgFe-LDH) composites was synthesized to remove Pb2+ from the aqueous solution. The results of SEM, EDS, XRD, FT-IR, XPS, VSM and BET determinations showed that MgFe-LDH was successfully loaded on the magnetic biochar by hydrothermal synthesis. These characterizations also indicated that the adsorption of Pb2+ resulted from co-precipitation between interlayer anions, surface hydroxyl groups and Pb2+. The isotherms study revealed that the adsorption of Pb2+ on magnetic biochar/MgFe-LDH was well fitted to Langmuir model. The maximum adsorption capacity was 476.25 mg g(-1) at 25 degrees C. Kinetic and thermodynamic studies indicated that the adsorption process was a spontaneous endothermic reaction and limited by chemisorption. Owing to the simple synthesis, superior adsorption capacity, good magnetic properties and cyclic utilization, the magnetic biochar/MgFe-LDH is a promising adsorbent for removing Pb2+ from aqueous solution.

引用

页码：278 / 287

页数：10

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