An Efficient Strategy for Enhancing the Adsorption Capabilities of Biochar via Sequential KMnO 4 -Promoted Oxidative Pyrolysis and H 2 O 2 Oxidation

Siyao Bian, Shuang Xu, Zhibing Yin, Sen Liu, Jihui Li, Shuying Xu and Yucang Zhang
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Siyao Bian: Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, School of Chemical Engineering and Technology, Hainan University, Haikou 570228, China
Shuang Xu: Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, School of Chemical Engineering and Technology, Hainan University, Haikou 570228, China
Zhibing Yin: Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, School of Chemical Engineering and Technology, Hainan University, Haikou 570228, China
Sen Liu: Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, School of Chemical Engineering and Technology, Hainan University, Haikou 570228, China
Jihui Li: Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, School of Chemical Engineering and Technology, Hainan University, Haikou 570228, China
Shuying Xu: Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, School of Chemical Engineering and Technology, Hainan University, Haikou 570228, China
Yucang Zhang: Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, School of Chemical Engineering and Technology, Hainan University, Haikou 570228, China

Sustainability, 2021, vol. 13, issue 5, 1-12

Abstract: In this study, sequential KMnO 4 -promoted oxidative pyrolysis and H 2 O 2 oxidation were employed to upgrade the adsorption capacities of durian shell biochar for methylene blue (MB) and tetracycline (TC) in an aqueous solution. It was found that the KMnO 4 /H 2 O 2 co-modification was greatly influenced by pyrolysis temperature and the optimal temperature was 300 °C. Moreover, a low concentration of H 2 O 2 enabled the improvement of the adsorption capabilities greatly with the catalysis of pre-impregnated manganese oxides, addressing the shortcoming of single H 2 O 2 modification. The co-modified biochar exhibited high adsorption capabilities for MB and TC, remarkably surpassed KMnO 4 - and H 2 O 2 - modified biochars as well as pristine biochar. The increase of adsorption capabilities could be mainly contributed to the incorporation of MnO x and carboxyl by KMnO 4 -promoted oxidative decomposition and Mn-catalyzed H 2 O 2 oxidation. This would provide a novel and efficient method for preparing highly adsorptive biochar using sequential KMnO 4 -promoted oxidative pyrolysis and H 2 O 2 oxidation.

Keywords: biochar; KMnO 4 /H 2 O 2 co-modification; methylene blue; tetracycline (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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