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
收藏
页码：278 / 287
页数：10
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