期刊
CHEMOSPHERE
卷 296, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.133981
关键词
Wheat straw biochar; KOH; KMnO 4 modification; Hierarchical structure; Tetracycline; Adsorption mechanisms
资金
- Natural Science Foundation of China [51809001, 51922101, 51979265]
- Natural Science Founda-tion of Jiangsu province, China [BK20190049]
- Provincial Foun-dation for Excellent Young Talents of Colleges and Universities of Anhui Province
In this study, co-modification of KOH and KMnO4 on biochar (K-Mn-BC) was performed, and the results showed that the modified K-Mn-BC had a high specific surface area and pore volume, and could efficiently adsorb TC within a wide pH range.
Modification of pristine biochars has received increasing attentions due to the significant potential in enhancing adsorption performance. In this work, the co-modification of KOH and KMnO4 on biochar (K-Mn-BC) was performed, with the effect of KOH/KMnO4 modification on biochar properties and their adsorption toward tetracycline (TC) being extensively explored. Results showed that KOH/KMnO4 modification can significantly regulate biochars to form hierarchical structure. The obtained K-Mn-BC was characterized with a high specific surface area (1524.6 m2 g-1) and total pore volume (0.85 cm3 g-1). In addition, the K-Mn-BC exhibited a high adsorption capacity of 584.19 mg g-1 toward TC at 318 K, and pseudo-second-order (R2:0.993-0.998) and Langmuir (R2: 0.834-0.874) models can fit well with the adsorption behavior. Moreover, the obtained K-Mn-BC can efficiently adsorb TC within a wide pH range (3.0-10.0), and were not affected by the co-existing ions. The possible mechanisms for the high adsorption capacity were ascribed to the pore filling and pi-pi interaction, following by hydrogen bonding and metal complexation. The obtained K-Mn-BC is a suitable adsorbent for TC removal from water due to the hierarchical structure, high adsorption capacity, and stable adsorption effect.
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