Preparation of biochar from walnut shells activated by H3PO4 and its application in Cr(Ⅵ) adsorption

被引：0
|
作者：
Xing X. [1 ,2 ,3 ,4 ]
Luo T. [1 ]
Bu Y. [1 ]
Ma P. [4 ]
机构：
[1] College of Chemistry and Chemical Engineering, Hefei University of Technology, Anhui, Hefei
[2] Advanced Energy Technology, Equipment Research Institute, Hefei University of Technology, Anhui, Hefei
[3] National New Energy Vehicle Energy Storage and Supply Product Industry Measurement and Testing Center, Anhui, Hefei
[4] College of Mechanical Engineering, Hefei University of Technology, Anhui, Hefei
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 03期
关键词：
activated carbon; adsorption; biomass;
D O I：
10.16085/j.issn.1000-6613.2022-0851
中图分类号：
学科分类号：
摘要：
Walnut shell-based activated carbon PBC was prepared using walnut shell as raw material and phosphoric acid (H3PO4) as activator, and its adsorption performance on hexavalent chromium was studied. The physical and chemical properties of PBC were measured using SEM, TEM, BET, FTIR, Raman, XPS and other characterizations, respectively. The effects of solution pH, activated carbon dosage and initial concentration on the performance of Cr(Ⅵ) adsorption were investigated. The kinetic behavior of Cr(Ⅵ) adsorption by PBC were examined and the adsorption mechanism was analyzed. The results showed that the prepared walnut shell-based activated carbon had good adsorption performance at a phosphoric acid impregnation ratio of 1∶ 1 and pyrolysis temperature of 400℃ . The adsorption rate reached 100% for the lower concentration of Cr(Ⅵ) solution (≤50mg/L). The adsorption kinetics and isotherms were in accordance with the proposed secondary kinetic model and Langmuir model, respectively, and the chemisorption dominated the adsorption process. The thermodynamic analysis indicated that the adsorption process was a spontaneous heat absorption process. © 2023 Chemical Industry Press. All rights reserved.
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页码：1527 / 1539
页数：12
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