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DC Field | Value | Language |
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dc.citation.startPage | 111346 | - |
dc.citation.title | ENVIRONMENTAL RESEARCH | - |
dc.citation.volume | 199 | - |
dc.contributor.author | Shin, Jaegwan | - |
dc.contributor.author | Kwak, Jinwoo | - |
dc.contributor.author | Lee, Yong-Gu | - |
dc.contributor.author | Kim, Sangwon | - |
dc.contributor.author | Son, Changgil | - |
dc.contributor.author | Cho, Kyung Hwa | - |
dc.contributor.author | Lee, Sang-Ho | - |
dc.contributor.author | Park, Yongeun | - |
dc.contributor.author | Ren, Xianghao | - |
dc.contributor.author | Chon, Kangmin | - |
dc.date.accessioned | 2023-12-21T15:37:12Z | - |
dc.date.available | 2023-12-21T15:37:12Z | - |
dc.date.created | 2021-07-15 | - |
dc.date.issued | 2021-08 | - |
dc.description.abstract | The single adsorption of radioactive barium (Ba(II)), cobalt (Co(II)), and strontium (Sr(II)) ions using pristine (SCWB-P) and chemically activated spent coffee waste biochars with NaOH (SCWB-A) were thoroughly explored in order to provide deeper insights into the changes in their adsorption mechanisms through alkaline chemical activation. The greater removal efficiencies of SCWB-A (76.6-97.3%) than SCWB-P (45.6-75.2%) and the consistency between the adsorptive removal patterns (Ba(II) > Sr(II) > Co(II)) and oxygen bond dissociation enthalpies (BaO (562 kJ/mol) > SrO (426 kJ/mol) > CoO (397 kJ/mol)) of radioactive species supported the assumption that the adsorption removal of radioactive species with spent coffee waste biochars highly depended on the abundances of O-containing functional groups. The calculated R2 values of the pseudo-first-order (SCWB-P = 0.998-0.999; SCWB-A = 0.850-0.921) and pseudo-second-order kinetic models (SCWB-P = 0.988-0.998; SCWB-A = 0.935-0.966) are evident that the physisorption mainly controlled the adsorption of radioactive species toward SCWB-P and the chemisorption played a crucial role in their adsorptive removal with SCWB-A. From the calculated intra-particle diffusion, isotherm, thermodynamic parameters, it can be concluded that the intra-particle diffusion and monolayer adsorption primarily governed the adsorption of radioactive species using SCWB-P and SCWB-A, and their adsorption processes occurred spontaneously and endothermically. The dominant adsorption mechanism of spent coffee waste biochars was changed from physisorption (Delta H- of SCWB-P = 21.6-29.8 kJ/mol) to chemisorption (Delta H- of SCWB-A = 42.4-81.3 kJ/mol) through alkaline chemical activation. The distinctive M-OH peak in the O1s XPS spectra of SCWB-A directly corresponding to the decrease in the abundances of O-containing functional groups confirms again that the enrichment of O-containing functional groups markedly facilitated the adsorption removal of radioactive species by chemisorption occurred at the inner and outer surfaces of spent coffee waste biochars. | - |
dc.identifier.bibliographicCitation | ENVIRONMENTAL RESEARCH, v.199, pp.111346 | - |
dc.identifier.doi | 10.1016/j.envres.2021.111346 | - |
dc.identifier.issn | 0013-9351 | - |
dc.identifier.scopusid | 2-s2.0-85106625030 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/53248 | - |
dc.identifier.url | https://www.sciencedirect.com/science/article/pii/S001393512100640X?via%3Dihub | - |
dc.identifier.wosid | 000663724400008 | - |
dc.language | 영어 | - |
dc.publisher | ACADEMIC PRESS INC ELSEVIER SCIENCE | - |
dc.title | Changes in adsorption mechanisms of radioactive barium, cobalt, and strontium ions using spent coffee waste biochars via alkaline chemical activation: Enrichment effects of O-containing functional groups | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | Environmental Sciences; Public, Environmental & Occupational Health | - |
dc.relation.journalResearchArea | Environmental Sciences & Ecology; Public, Environmental & Occupational Health | - |
dc.type.docType | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordAuthor | Alkaline chemical activation | - |
dc.subject.keywordAuthor | Chemisorption | - |
dc.subject.keywordAuthor | O-containing functional groups | - |
dc.subject.keywordAuthor | Physisorption | - |
dc.subject.keywordAuthor | Radioactive species | - |
dc.subject.keywordPlus | AQUEOUS-SOLUTIONS | - |
dc.subject.keywordPlus | MAGNETIC BIOCHAR | - |
dc.subject.keywordPlus | FACILE SYNTHESIS | - |
dc.subject.keywordPlus | REMOVAL | - |
dc.subject.keywordPlus | EFFICIENT | - |
dc.subject.keywordPlus | CARBON | - |
dc.subject.keywordPlus | EQUILIBRIUM | - |
dc.subject.keywordPlus | NANOSHEETS | - |
dc.subject.keywordPlus | CADMIUM | - |
dc.subject.keywordPlus | METALS | - |
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