Desorption of calcium-rich crayfish shell biochar for the removal of lead from aqueous solutions

被引：45
|
作者：
Zhang, Jiaqi [1 ]
Hu, Xiaolan [1 ]
Zhang, Kejing [1 ]
Xue, Yingwen [1 ]
机构：
[1] Wuhan Univ, Sch Civil Engn, Wuhan, Hubei, Peoples R China
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2019年 / 554卷
关键词：
Lead removal; Biochar; Adsorption; Desorption; HEAVY-METAL IONS; ACTIVATED CARBON; ADSORPTION; SORPTION; CADMIUM; WASTE; WOOD; PYROLYSIS; POLLUTION; CHINA;
D O I：
10.1016/j.jcis.2019.06.096
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：
In this study, crayfish shell was pyrolyzed at 600 degrees C to obtain a calcium-rich biochar (CS600). The biochar was saturated with Pb2+ in batch adsorption experiment. Six desorption reagents including HCl, HNO3, H2SO4, NaOH, EDTA and EDTA-2NaCa were then used to desorb Pb2+ from the post-adsorption CS600 to determine the desorption mechanism. Lead adsorption experiments were performed to determine the adsorption capacity of the regenerated CS600. HCl, HNO3, EDTA and EDTA-2NaCa presented good desorption effect with desorption rates all over 80%. Most of the regenerated biochars lost their lead adsorption ability due to the destruction of CaCO3 mineral on their surface. Only the one desorbed by EDTA-2NaCa retained a preferable lead adsorption capacity. EDTA-2NaCa thus is a promising desorption reagent of CS600 for the removal of lead from aqueous solutions. (C) 2019 Elsevier Inc. All rights reserved.
引用
收藏
页码：417 / 423
页数：7
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