Hierarchical porous biochar from shrimp shell for persulfate activation: A two-electron transfer path and key impact factors

• Published in: Applied catalysis. B, Environmental Vol. 260; p. 118160
• Main Authors: Yu, Jiangfang, Tang, Lin, Pang, Ya, Zeng, Guangming, Feng, Haopeng, Zou, Jiajing, Wang, Jingjing, Feng, Chengyang, Zhu, Xu, Ouyang, Xilian, Tan, Jisui
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.01.2020; Elsevier BV
• Subjects: 2,4-Dichlorophenol; Activation; Anions; Carbon; Carbon configurations; Catalytic activity; Charcoal; Decapoda; Electron transfer; Hierarchical porosity; Humic acids; Impact factors; Interfacial catalysis; Non-radical path; Pyrolysis; Saline water; Hierarchical porosity; Non-radical path; Interfacial catalysis; 2,4-Dichlorophenol; Carbon configurations
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2019.118160

[Display omitted] •Prepared biochar (PSS-800) owned hierarchical pore structure.•Adsorption was the key step for the catalytic process.•PSS-800 was dominated by a novel two-electron transfer path.•Porosity and carbon configuration were two crucial impact factors of biochar. Herein, hierarchical porous biochar from shrimp shell (PSS-bio) was prepared and applied for persulfate activation for 2,4-dichlorophenol removal. The pyrolysis temperature was found to play an important role in carbon structure and property modulation, where PSS-bio obtained at 800 °C (PSS-800) exhibited the fastest adsorption capacity and the best catalytic activity with the degradation rates 29 times higher than that of PSS-bio obtained at 400 °C (PSS-400). Further analysis demonstrated that hierarchical pores and carbon configuration were two key impact factors of biochar in AOP. Interestingly, the original free-radical dominated pathway in PSS-400 also changed into a non-radical one (direct two-electron transfer path) in PSS-800, whose efficiency could be somewhat disturbed by pH values, humic acid and anions regardless of their concentrations as low as 5 mM or as high as 500 mM, demonstrating its application potential for the treatment of both highly saline water and organic-rich water.