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

By Jiangfang Yu, L. Tang, Ya Pang, Guangming Zeng, Haopeng Feng, Jiajing Zou, Jingjing Wang, Chengyang Feng, Xu Zhu, Xilian Ouyang and 1 more. 2020

418 citations recorded by the source corpus.

Abstract 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.

Subfields: Materials Chemistry, Renewable Energy, Sustainability and the Environment, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/45b149e3fdfd4463370e242fbbcd7c57608b60dc