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dc.contributor.authorZhu, S.en
dc.contributor.authorHuang, X.en
dc.contributor.authorMa, F.en
dc.contributor.authorWang, L.en
dc.contributor.authorDuan, X.en
dc.contributor.authorWang, S.en
dc.identifier.citationEnvironmental Science and Technology, 2018; 52(15):8649-8658en
dc.description.abstractEnvironmentally 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.en
dc.description.statementofresponsibilityShishu Zhu, Xiaochen Huang, Fang Ma, Li Wang, Xiaoguang Duan and Shaobin Wangen
dc.publisherACS Publishingen
dc.rights© 2018 American Chemical Societyen
dc.titleCatalytic removal of aqueous contaminants on N-doped graphitic biochars: inherent roles of adsorption and nonradical mechanismen
dc.typeJournal articleen
pubs.library.collectionEnvironment Institute publicationsen
dc.identifier.orcidDuan, X. [0000-0001-9635-5807]en
dc.identifier.orcidWang, S. [0000-0002-1751-9162]en
Appears in Collections:Environment Institute publications

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