Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/116296
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Type: Journal article
Title: Catalytic removal of aqueous contaminants on N-doped graphitic biochars: inherent roles of adsorption and nonradical mechanism
Author: Zhu, S.
Huang, X.
Ma, F.
Wang, L.
Duan, X.
Wang, S.
Citation: Environmental Science and Technology, 2018; 52(15):8649-8658
Publisher: ACS Publishing
Issue Date: 2018
ISSN: 0013-936X
1520-5851
Statement of
Responsibility: 
Shishu Zhu, Xiaochen Huang, Fang Ma, Li Wang, Xiaoguang Duan and Shaobin Wang
Abstract: Environmentally friendly and low-cost catalysts are important for the rapid mineralization of organic contaminants in powerful advanced oxidation processes (AOPs). In this study, we reported N-doped graphitic biochars (N-BCs) as low-cost and efficient catalysts for peroxydisulfate (PDS) activation and the degradation of diverse organic pollutants in water treatment, including Orange G, phenol, sulfamethoxazole, and bisphenol A. The biochars at high annealing temperatures (>700 °C) presented highly graphitic nanosheets, large specific surface areas (SSAs), and rich doped nitrogen. In particular, N-BC derived at 900 °C (N-BC900) exhibited the highest degradation rate, which was 39-fold and 6.5-fold of that on N-BC400 and pristine biochar, respectively, and the N-BC900 surpassed most popular metal or nanocarbon catalysts. Different from the radical-based oxidation in N-BC400/PDS via the persistent free radicals (PFRs), singlet oxygen and nonradical pathways (surface-confined activated persulfate–carbon complexes) were discovered to dominate the oxidation processes in N-BC900/PDS. Moreover, the adsorption of organics was determined to be the key step determining reaction rate, revealing that the pre-adsorption of reactants significantly accelerated the nonradical oxidation pathway. This study not only provides robust and cheap carbonaceous materials for environmental remediation but also enables the first insight into the graphitic biochar-based nonradical catalysis.
Keywords: Charcoal; Graphite; Catalysis; Adsorption
Rights: © 2018 American Chemical Society
RMID: 0030095332
DOI: 10.1021/acs.est.8b01817
Appears in Collections:Environment Institute publications

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