High-efficiency removal of dyes from wastewater by fully recycling litchi peel biochar

被引：161
作者：
Wu, Jia [1 ]
Yang, Jianwei [1 ]
Feng, Pu [1 ]
Huang, Guohuan [1 ]
Xu, Chuanhui [1 ]
Lin, Baofeng [1 ]
机构：
[1] Guangxi Univ, Sch Chem & Chem Engn, Nanning 530004, Peoples R China
来源：
CHEMOSPHERE | 2020年 / 246卷
基金：
中国国家自然科学基金;
关键词：
Litchi peel; Hydrothermal carbonization; Adsorption; Congo red; Malachite green; AQUEOUS-SOLUTION; CONGO RED; ADSORPTIVE REMOVAL; MALACHITE GREEN; METHYLENE-BLUE; RHODAMINE-B; CARBON; ADSORBENT; KINETICS; SHELL;
D O I：
10.1016/j.chemosphere.2019.125734
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Litchi peel biochar was prepared by hydrothermal carbonization and subsequent activation process, and its adsorption on congo red and malachite green were investigated. The structural characteristics and adsorption properties of litchi peel biochar were studied by Scanning electron microscopy, X-ray diffractometer, Brunauer-Emmett-Teller, and dye adsorption experiments, and the adsorption mechanism between litchi peel biochar and dye molecules was analyzed by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. The results showed that the litchi peel biochar had a high specific surface area and pore volume of 1006 m(2) g(-1) and 0.588 cm(3) g(-1), respectively, and its adsorption capacity for congo red and malachite green was 404.4 and 2468 mg g(-1), respectively. The excellent adsorption properties were due to hydrogen bonding, pi-pi interaction, pore filling and electrostatic interactions. In addition, the reactivated litchi peel biochar also showed good adsorption performance, and all the adsorbed dyes were completely removed by reactivation, which realized complete recycling of the litchi peel biochar without causing secondary environmental pollution. Therefore, litchi peel biochar was expected to be an effective and recyclable adsorbent for removing congo red and malachite green from aqueous solutions. (C) 2019 Elsevier Ltd. All rights reserved.
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页数：10
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