Unraveling iron speciation on Fe-biochar with distinct arsenic removal mechanisms and depth distributions of As and Fe
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 | Cao, Xinde | - |
dc.contributor.author | Hou, Deyi | - |
dc.contributor.author | Alessi, Daniel S. | - |
dc.contributor.author | Ok, Yong Sik | - |
dc.contributor.author | Tsang, Daniel C. W. | - |
dc.date.accessioned | 2022-03-03T13:41:06Z | - |
dc.date.available | 2022-03-03T13:41:06Z | - |
dc.date.created | 2022-03-02 | - |
dc.date.issued | 2021-12-01 | - |
dc.identifier.issn | 1385-8947 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/137628 | - |
dc.description.abstract | Tailored manipulation of iron speciation has become a critical challenge for the further development of Fe-biochar as an economical and eco-friendly amendment for arsenic (As) immobilization. Herein, a series of Fe-biochars with manipulated iron speciations were fabricated by controlling the carbon structures and pyrolysis conditions. Results revealed that abundant labile-/amorphous-C induced more reductive-Fe(0) formation (10.9 mg g(-1)) in the Fe-biochar. The high Fe(0) content resulted in the effective As immobilization (4.34 mg g(-1) As(V) and 7.72 mg g(-1) As(III)) as evidenced by Pearson correlation coefficient (PCC) analysis. The hierarchical depth distributions of As and Fe on the Fe-biochar caused by the redox reaction and concomitant sorption of As proved the decisive role of Fe(0). An iron-oxide shell (similar to 10-20 nm) with a high arsenic accumulation was revealed on the surface, while deeper within the particles, Fe(0) was found to be associated with elemental As (As(0), up to 19.4%). By contrast, pyrolysis with the stable-/graphitic-C generated more amorphous-Fe (61.9 mg g(-1)) on the Fe-biochar, which accounted for the high As removal (10.1 mg g(-1) As(V) and 7.70 mg g(-1) As(III)) despite the limited Fe(0) content. In comparison to the reductive Fe(0), distinct depth distribution was observed that the As/Fe ratio was marginally changed within 200 nm depth of the amorphous-Fe biochar after As decontamination. Co-precipitation of As with Fe released from amorphous-Fe contributed to this depth distribution, as evidenced by the high correlation between released-Fe and As immobilization capacity (PCC as 0.84-0.95). This study unveiled a crucial role of iron speciation on distinct mechanisms for As removal, guiding the application-oriented design of multifunctional Fe-biochar for broad environmental remediation. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | ELSEVIER SCIENCE SA | - |
dc.subject | ZERO-VALENT IRON | - |
dc.subject | ZEROVALENT IRON | - |
dc.subject | MOLECULAR-STRUCTURE | - |
dc.subject | WASTE-WATER | - |
dc.subject | SORPTION | - |
dc.subject | REDUCTION | - |
dc.subject | OXIDATION | - |
dc.subject | AS(III) | - |
dc.subject | COMPOSITES | - |
dc.subject | MAGNETITE | - |
dc.title | Unraveling iron speciation on Fe-biochar with distinct arsenic removal mechanisms and depth distributions of As and Fe | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Ok, Yong Sik | - |
dc.identifier.doi | 10.1016/j.cej.2021.131489 | - |
dc.identifier.scopusid | 2-s2.0-85112433548 | - |
dc.identifier.wosid | 000707126000200 | - |
dc.identifier.bibliographicCitation | CHEMICAL ENGINEERING JOURNAL, v.425 | - |
dc.relation.isPartOf | CHEMICAL ENGINEERING JOURNAL | - |
dc.citation.title | CHEMICAL ENGINEERING JOURNAL | - |
dc.citation.volume | 425 | - |
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.journalWebOfScienceCategory | Engineering, Environmental | - |
dc.relation.journalWebOfScienceCategory | Engineering, Chemical | - |
dc.subject.keywordPlus | ZERO-VALENT IRON | - |
dc.subject.keywordPlus | ZEROVALENT IRON | - |
dc.subject.keywordPlus | MOLECULAR-STRUCTURE | - |
dc.subject.keywordPlus | WASTE-WATER | - |
dc.subject.keywordPlus | SORPTION | - |
dc.subject.keywordPlus | REDUCTION | - |
dc.subject.keywordPlus | OXIDATION | - |
dc.subject.keywordPlus | AS(III) | - |
dc.subject.keywordPlus | COMPOSITES | - |
dc.subject.keywordPlus | MAGNETITE | - |
dc.subject.keywordAuthor | Engineering biochar | - |
dc.subject.keywordAuthor | Arsenic immobilization | - |
dc.subject.keywordAuthor | Redox reaction | - |
dc.subject.keywordAuthor | Co-precipitation | - |
dc.subject.keywordAuthor | Iron transformation | - |
dc.subject.keywordAuthor | Green and sustainable remediation | - |
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