Removal of Pb2+ from aqueous solution using an MgO nano-hybridized magnetic biochar from spent coffee grounds

被引：9

作者：

Yang, Shaohui ^{[1
]}

Wang, Chen ^{[1
]}

Li, Bingqi ^{[1
]}

Chen, Hong ^{[1
]}

Wang, Jiehua ^{[1
]}

机构：

[1] Tianjin Univ, Sch Environm Sci & Engn, 92 Weijin Rd, Tianjin 300072, Peoples R China

来源：

CHEMICAL PHYSICS LETTERS | 2023年 / 833卷

关键词：

Magnetic biochar; MgO nanoparticles; Pb 2+removal; Coffee grounds; LEAD REMOVAL; ION-EXCHANGE; HEAVY-METALS; ADSORPTION; MECHANISM; PB(II); ADSORBENTS; EFFICIENCY; CD(II);

D O I：

10.1016/j.cplett.2023.140894

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 MgO nano-hybridized magnetic biochar (MMB) was successfully prepared from spent coffee grounds to remove Pb2+ from aqueous solution. It was the first time that carbon-based MgO composites were prepared by hydrothermal synthesis. At 20 degrees C, the maximum adsorption capacity of MMB was 321.9 mg/g (pH 5). The adsorption kinetics followed Pseudo second-order kinetic model. The adsorption process of MMB was confirmed by the Langmuir isothermal model, indicating the adsorption reaction was a single-layer chemisorption on MMB surface. XPS, FTIR and XRD analyses indicated the adsorption mechanism included surface complexation, ion exchange reaction and surface precipitation, with surface precipitation playing the largest role.

引用

页数：10

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