Effect of KOH Activation on the Properties of Biochar and Its Adsorption Behavior on Tetracycline Removal from an Aqueous Solution

被引：0

作者：

Xu J. ^{[1
]}

Ma Y.-F. ^{[1
]}

Yao G.-Q. ^{[1
]}

Zhang Y.-S. ^{[1
]}

Yang L.-Q. ^{[1
]}

Zhou N. ^{[1
]}

Fan S.-S. ^{[1
]}

机构：

[1] College of Resources and Environment, Anhui Agricultural University, Hefei

来源：

Huanjing Kexue/Environmental Science | 2022年 / 43卷 / 12期

关键词：

adsorption behavior; adsorption mechanism; biochar; KOH activation; tetracycline; wheat straw;

D O I：

10.13227/j.hjkx.202201253

中图分类号：

学科分类号：

摘要：

Activation modification is an important pathway to improve the adsorption performance of biochar. In this study, modified biochar (K-BC) was prepared from wheat straw, KOH acted as an activator agent, and pristine biochar (BC) was prepared as a control. The biochars were characterized by nitrogen adsorption and desorption, elemental analysis, XPS, FTIR, Raman, XRD, and pHpzc. The effect of KOH modification on the physical and chemical properties of biochars was investigated systematically, and the adsorption performance and mechanism of tetracycline on biochars were also explored. The results showed that the specific surface area and pore volume of KOH activated biochar reached 996.4 m2·g -1 and 0.45 cm3·g -1. KOH activation produced more carbon structural defects and affected functional groups and surface electrical properties in the biochar. Pseudo-second order kinetics and Langmuir models better fitted the adsorption process of tetracycline on biochar. With the increase in temperature, the adsorption capacity of tetracycline on biochar increased accordingly. The adsorption process of TC by K-BC was spontaneous and endothermic and increased randomness. The theoretical maximum adsorption capacity of K-BC for tetracycline was 491.19 mg·g -1 (at a 45℃ experimental temperature). Combined with the Raman, FTIR, and XPS characterization of biochars after TC adsorption, it was found that pore filling and π-π interaction were the main mechanisms for TC removal by K-BC, followed by hydrogen bonding and metal complexation. Further, K-BC presented a good recycling performance. In summary, KOH activation on wheat straw biochar was effective and feasible and could be used to remove tetracycline from wastewater. © 2022 Science Press. All rights reserved.

引用

页码：5635 / 5646

页数：11

共 45 条

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