Electroactive Fe-biochar for redox-related remediation of arsenic and chromium: Distinct redox nature with varying iron/carbon speciation
DC Field | Value | Language |
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dc.contributor.author | Xu, Zibo | - |
dc.contributor.author | Wan, Zhonghao | - |
dc.contributor.author | Sun, Yuqing | - |
dc.contributor.author | Gao, Bin | - |
dc.contributor.author | Hou, Deyi | - |
dc.contributor.author | Cao, Xinde | - |
dc.contributor.author | Komarek, Michael | - |
dc.contributor.author | Ok, Yong Sik | - |
dc.contributor.author | Tsang, Daniel C. W. | - |
dc.date.accessioned | 2022-08-13T18:40:16Z | - |
dc.date.available | 2022-08-13T18:40:16Z | - |
dc.date.created | 2022-08-12 | - |
dc.date.issued | 2022-05-15 | - |
dc.identifier.issn | 0304-3894 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/143059 | - |
dc.description.abstract | Electroactive Fe-biochar has attracted significant attention for As(III)/Cr(VI) immobilization through redox reactions, and its performance essentially lies in the regulation of various Fe/C moieties for desired redox performance. Here, a series of Fe-biochar with distinct Fe/C speciation were rationally produced via two-step pyrolysis of iron minerals and biomass waste at 400-850 degrees C (BCX-Fe-Y, X and Y represented the first- and second-step pyrolysis temperature, respectively). The redox transformation of Cr(VI) and As(III) by Fe-biochar was evaluated in simulated wastewater under oxic or anoxic conditions. Results showed that more effective Cr(VI) reduction could be achieved by BCX-Fe-400, while a higher amount of As (III) was oxidized by BCX-Fe-850 under the anoxic environment. Besides, BCX-Fe-400 could generate more reactive oxygen species (e.g., center dot OH) by reducing the O-2, which enhanced the redox-related transformation of pollutants under the oxic situation. The evolving redox performance of Fe-biochar was governed by the transition of the redox state from reductive to oxidative related to the Fe/C speciation. The small-sized amorphous/low-crystalline ferrous minerals contributed to a higher electron-donating capacity (0.43-1.28 mmol g(-1)) of BCX-Fe-400. In contrast, the oxidative surface oxygen-functionalities (i.e., carboxyl and quinoid) on BCX-Fe-850 endowed a stronger electron-accepting capacity (0.71-1.39 mmol g(-1)). Moreover, the graphitic crystallites with edge-type defects and porous structure facilitated the electron transfer, leading to a higher electron efficiency of BCX-Fe-850. Overall, we unveiled the roles of both Fe and C speciation in maneuvering the redox reactivity of Fe-biochar, which can advance our rational design of electroactive Fe-biochar for redox-related environmental remediation. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | ELSEVIER | - |
dc.subject | REDUCTION | - |
dc.subject | OXIDATION | - |
dc.subject | REMOVAL | - |
dc.subject | COMPOSITES | - |
dc.subject | GENERATION | - |
dc.subject | RADICALS | - |
dc.subject | GRAPHENE | - |
dc.subject | CR(VI) | - |
dc.subject | H2O2 | - |
dc.title | Electroactive Fe-biochar for redox-related remediation of arsenic and chromium: Distinct redox nature with varying iron/carbon speciation | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Ok, Yong Sik | - |
dc.identifier.doi | 10.1016/j.jhazmat.2022.128479 | - |
dc.identifier.scopusid | 2-s2.0-85126132780 | - |
dc.identifier.wosid | 000762640800001 | - |
dc.identifier.bibliographicCitation | JOURNAL OF HAZARDOUS MATERIALS, v.430 | - |
dc.relation.isPartOf | JOURNAL OF HAZARDOUS MATERIALS | - |
dc.citation.title | JOURNAL OF HAZARDOUS MATERIALS | - |
dc.citation.volume | 430 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Engineering | - |
dc.relation.journalResearchArea | Environmental Sciences & Ecology | - |
dc.relation.journalWebOfScienceCategory | Engineering, Environmental | - |
dc.relation.journalWebOfScienceCategory | Environmental Sciences | - |
dc.subject.keywordPlus | REDUCTION | - |
dc.subject.keywordPlus | OXIDATION | - |
dc.subject.keywordPlus | REMOVAL | - |
dc.subject.keywordPlus | COMPOSITES | - |
dc.subject.keywordPlus | GENERATION | - |
dc.subject.keywordPlus | RADICALS | - |
dc.subject.keywordPlus | GRAPHENE | - |
dc.subject.keywordPlus | CR(VI) | - |
dc.subject.keywordPlus | H2O2 | - |
dc.subject.keywordAuthor | Engineered biochar | - |
dc.subject.keywordAuthor | Reduction-oxidation | - |
dc.subject.keywordAuthor | Mineral transformation | - |
dc.subject.keywordAuthor | Electron transfer | - |
dc.subject.keywordAuthor | Sustainable waste management | - |
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