Performance, kinetics, and equilibrium of methylene blue adsorption on biochar derived from eucalyptus saw dust modified with citric, tartaric, and acetic acids

被引：261
作者：
Sun, Lei [1 ]
Chen, Dongmei [1 ]
Wan, Shungang [2 ]
Yu, Zebin [1 ]
机构：
[1] Guangxi Univ, Sch Environm, Nanning 530004, Peoples R China
[2] Chinese Acad Sci, Inst Urban Environm, Xiamen 361021, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2015年 / 198卷
关键词：
Biochar; Organic acid; Eucalyptus saw dust; Modification; Adsorption; MODIFIED RICE HUSK; AQUEOUS-SOLUTION; ACTIVATED CARBON; MALACHITE-GREEN; LOW-COST; REMOVAL; STRAW; DYE; WATER; ADSORBENT;
D O I：
10.1016/j.biortech.2015.09.026
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
Biochar derived from eucalyptus saw dust modified with citric, tartaric, and acetic acids at low temperatures was utilized as adsorbent to remove methylene blue (MB) from aqueous solutions. Fourier transform infrared spectroscopy analysis showed that the carboxyl group was introduced on the biochar surface. Adsorption experiment data indicated that eucalyptus saw dust modified with citric acid showed higher MB adsorption efficiency than that modified with tartaric and acetic acids. Pseudo-second-order kinetics was the most suitable model for describing MB adsorption on biochar compared with pseudo-first-order, Elovich, and intraparticle diffusion models. The calculated values of Delta G(0) and Delta H-0 indicated the spontaneous and endothermic nature of the adsorption process. MB adsorption on biochar followed the Langmuir isotherm. The maximum adsorption capacities for eucalyptus saw dust modified with citric, tartaric, and acetic acids were 178.57, 99.01, and 29.94 mg g(-1), respectively, at 35 degrees C. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：300 / 308
页数：9
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