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Co-catalysis of trace dissolved Fe(iii) with biochar in hydrogen peroxide activation for enhanced oxidation of pollutants
Activation of hydrogen peroxide (H(2)O(2)) with biochar is a sustainable and low-cost approach for advanced oxidation of organic pollutants, but faces the challenge of a low yield of hydroxyl radical (˙OH). Herein, we hypothesize that the activation efficiency of H(2)O(2) can be enhanced through co-...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9186116/ https://www.ncbi.nlm.nih.gov/pubmed/35765422 http://dx.doi.org/10.1039/d2ra01647h |
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author | Feng, Dongqing Shou, Jianxin Guo, Sen Ya, Mengna Li, Jianfa Dong, Huaping Li, Yimin |
author_facet | Feng, Dongqing Shou, Jianxin Guo, Sen Ya, Mengna Li, Jianfa Dong, Huaping Li, Yimin |
author_sort | Feng, Dongqing |
collection | PubMed |
description | Activation of hydrogen peroxide (H(2)O(2)) with biochar is a sustainable and low-cost approach for advanced oxidation of organic pollutants, but faces the challenge of a low yield of hydroxyl radical (˙OH). Herein, we hypothesize that the activation efficiency of H(2)O(2) can be enhanced through co-catalysis of trace dissolved iron (Fe) with biochar. Two biochar samples derived from different feedstock, namely LB from liquor-making residue and WB from wood sawdust, were tested in the co-catalytic systems using trace Fe(iii) (0.3 mg L(−1)). The cumulative ˙OH production in [Fe(iii) + LB]/H(2)O(2) was measured to be 3.28 times that in LB/H(2)O(2), while the cumulative ˙OH production in [Fe(iii) + WB]/H(2)O(2) was 11.9 times that in WB/H(2)O(2). No extra consumption of H(2)O(2) was observed in LB/H(2)O(2) or WB/H(2)O(2) after addition of trace Fe(iii). Consequently, the reaction rate constants (k(obs)) for oxidation of pollutants (2,4-dichlorophenoxyacetic acid and sulfamethazine) were enhanced by 3.13–9.16 times. Other iron species including dissolved Fe(ii) and iron minerals showed a similar effect on catalyzing 2,4-D oxidation by biochar/H(2)O(2). The interactions involved in adsorption and reduction of Fe(iii) by biochar in which the defects acted as electron donors and oxygen-containing functional groups bridged the electron transfer. The fast regeneration of Fe(ii) in the co-catalytic system resulted in the sustainable ˙OH production, thus the efficient oxidation of pollutants comparable to other advanced oxidation processes was achieved by using dissolved iron at a concentration as low as the concentration that can be found in natural water. |
format | Online Article Text |
id | pubmed-9186116 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-91861162022-06-27 Co-catalysis of trace dissolved Fe(iii) with biochar in hydrogen peroxide activation for enhanced oxidation of pollutants Feng, Dongqing Shou, Jianxin Guo, Sen Ya, Mengna Li, Jianfa Dong, Huaping Li, Yimin RSC Adv Chemistry Activation of hydrogen peroxide (H(2)O(2)) with biochar is a sustainable and low-cost approach for advanced oxidation of organic pollutants, but faces the challenge of a low yield of hydroxyl radical (˙OH). Herein, we hypothesize that the activation efficiency of H(2)O(2) can be enhanced through co-catalysis of trace dissolved iron (Fe) with biochar. Two biochar samples derived from different feedstock, namely LB from liquor-making residue and WB from wood sawdust, were tested in the co-catalytic systems using trace Fe(iii) (0.3 mg L(−1)). The cumulative ˙OH production in [Fe(iii) + LB]/H(2)O(2) was measured to be 3.28 times that in LB/H(2)O(2), while the cumulative ˙OH production in [Fe(iii) + WB]/H(2)O(2) was 11.9 times that in WB/H(2)O(2). No extra consumption of H(2)O(2) was observed in LB/H(2)O(2) or WB/H(2)O(2) after addition of trace Fe(iii). Consequently, the reaction rate constants (k(obs)) for oxidation of pollutants (2,4-dichlorophenoxyacetic acid and sulfamethazine) were enhanced by 3.13–9.16 times. Other iron species including dissolved Fe(ii) and iron minerals showed a similar effect on catalyzing 2,4-D oxidation by biochar/H(2)O(2). The interactions involved in adsorption and reduction of Fe(iii) by biochar in which the defects acted as electron donors and oxygen-containing functional groups bridged the electron transfer. The fast regeneration of Fe(ii) in the co-catalytic system resulted in the sustainable ˙OH production, thus the efficient oxidation of pollutants comparable to other advanced oxidation processes was achieved by using dissolved iron at a concentration as low as the concentration that can be found in natural water. The Royal Society of Chemistry 2022-06-10 /pmc/articles/PMC9186116/ /pubmed/35765422 http://dx.doi.org/10.1039/d2ra01647h Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/ |
spellingShingle | Chemistry Feng, Dongqing Shou, Jianxin Guo, Sen Ya, Mengna Li, Jianfa Dong, Huaping Li, Yimin Co-catalysis of trace dissolved Fe(iii) with biochar in hydrogen peroxide activation for enhanced oxidation of pollutants |
title | Co-catalysis of trace dissolved Fe(iii) with biochar in hydrogen peroxide activation for enhanced oxidation of pollutants |
title_full | Co-catalysis of trace dissolved Fe(iii) with biochar in hydrogen peroxide activation for enhanced oxidation of pollutants |
title_fullStr | Co-catalysis of trace dissolved Fe(iii) with biochar in hydrogen peroxide activation for enhanced oxidation of pollutants |
title_full_unstemmed | Co-catalysis of trace dissolved Fe(iii) with biochar in hydrogen peroxide activation for enhanced oxidation of pollutants |
title_short | Co-catalysis of trace dissolved Fe(iii) with biochar in hydrogen peroxide activation for enhanced oxidation of pollutants |
title_sort | co-catalysis of trace dissolved fe(iii) with biochar in hydrogen peroxide activation for enhanced oxidation of pollutants |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9186116/ https://www.ncbi.nlm.nih.gov/pubmed/35765422 http://dx.doi.org/10.1039/d2ra01647h |
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