Activation of persulfate by biochar for the degradation of phenolic compounds in aqueous systems
Advanced Oxidation Processes (AOPs) based on sulfate radicals (SR-AOPs) are efficient chemical methods for water and wastewater treatment gaining attention in the last years. In this study, the application of biochar (BC) matrix as an alternative carbon catalyst for the activation of persulfate (PS)...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-03-01
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| Series: | Chemical Engineering Journal Advances |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666821121001162 |
| _version_ | 1819009814592749568 |
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| author | Kleopatra Miserli Dimitra Kogola Irini Paraschoudi Ioannis Konstantinou |
| author_facet | Kleopatra Miserli Dimitra Kogola Irini Paraschoudi Ioannis Konstantinou |
| author_sort | Kleopatra Miserli |
| collection | DOAJ |
| description | Advanced Oxidation Processes (AOPs) based on sulfate radicals (SR-AOPs) are efficient chemical methods for water and wastewater treatment gaining attention in the last years. In this study, the application of biochar (BC) matrix as an alternative carbon catalyst for the activation of persulfate (PS) and degradation of phenol and phenolic transformation products was examined. BC/PS system was compared with BC/Fe2+/PS system however the presence of Fe2+ did not enhance greatly the degradation rate showing that biochar playing the major role in PS activation. The effect of various parameters, such as PS and BC dosing, pH, the presence of anions (Cl−, NO3−, HCO3−, HPO42−) and humic acids (HA), separately and in combination, at different concentration levels, simulating surface waters and wastewaters, in degradation kinetics was studied. Degradation of phenolics followed pseudo-first order kinetics in all cases and under optimum conditions, fast complete removal was achieved within few minutes. The presence of all anions studied decreased the removal rate of phenolics with HPO42− showing the greater inhibition. Moreover, humic acids, as representatives of natural organic matter (NOM), decrease phenolics degradation efficiency and in combination with anions showed the more pronounced inhibitory effect. In addition, scavenger quenching experiments with ethanol, tert-butanol and NaN3 confirmed the dominant role of 1O2 following by HO• radicals while sulfate (SO4•−) radicals contribute to a minor degree. Biochar loses progressively its activation efficiency after three cycles. The results of this study contribute to the development of analogous treatment technologies for the removal of phenol-based taste and odor compounds. |
| first_indexed | 2024-12-21T01:02:21Z |
| format | Article |
| id | doaj.art-4a3bc2d9e2fb400c84ab34510b9afa31 |
| institution | Directory Open Access Journal |
| issn | 2666-8211 |
| language | English |
| last_indexed | 2024-12-21T01:02:21Z |
| publishDate | 2022-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Chemical Engineering Journal Advances |
| spelling | doaj.art-4a3bc2d9e2fb400c84ab34510b9afa312022-12-21T19:21:09ZengElsevierChemical Engineering Journal Advances2666-82112022-03-019100201Activation of persulfate by biochar for the degradation of phenolic compounds in aqueous systemsKleopatra Miserli0Dimitra Kogola1Irini Paraschoudi2Ioannis Konstantinou3Department of Chemistry, University of Ioannina, 45110, GreeceDepartment of Chemistry, University of Ioannina, 45110, GreeceDepartment of Chemistry, University of Ioannina, 45110, GreeceDepartment of Chemistry, University of Ioannina, 45110, Greece; Institute of Environment and Sustainable Development, University Research Center of Ioannina (URCI), Ioannina 45110, Greece; Corresponding author at: Department of Chemistry, University of Ioannina, 45110, Greece.Advanced Oxidation Processes (AOPs) based on sulfate radicals (SR-AOPs) are efficient chemical methods for water and wastewater treatment gaining attention in the last years. In this study, the application of biochar (BC) matrix as an alternative carbon catalyst for the activation of persulfate (PS) and degradation of phenol and phenolic transformation products was examined. BC/PS system was compared with BC/Fe2+/PS system however the presence of Fe2+ did not enhance greatly the degradation rate showing that biochar playing the major role in PS activation. The effect of various parameters, such as PS and BC dosing, pH, the presence of anions (Cl−, NO3−, HCO3−, HPO42−) and humic acids (HA), separately and in combination, at different concentration levels, simulating surface waters and wastewaters, in degradation kinetics was studied. Degradation of phenolics followed pseudo-first order kinetics in all cases and under optimum conditions, fast complete removal was achieved within few minutes. The presence of all anions studied decreased the removal rate of phenolics with HPO42− showing the greater inhibition. Moreover, humic acids, as representatives of natural organic matter (NOM), decrease phenolics degradation efficiency and in combination with anions showed the more pronounced inhibitory effect. In addition, scavenger quenching experiments with ethanol, tert-butanol and NaN3 confirmed the dominant role of 1O2 following by HO• radicals while sulfate (SO4•−) radicals contribute to a minor degree. Biochar loses progressively its activation efficiency after three cycles. The results of this study contribute to the development of analogous treatment technologies for the removal of phenol-based taste and odor compounds.http://www.sciencedirect.com/science/article/pii/S2666821121001162PersulfateActivationBiocharWaterWastewaterMatrix constituents |
| spellingShingle | Kleopatra Miserli Dimitra Kogola Irini Paraschoudi Ioannis Konstantinou Activation of persulfate by biochar for the degradation of phenolic compounds in aqueous systems Chemical Engineering Journal Advances Persulfate Activation Biochar Water Wastewater Matrix constituents |
| title | Activation of persulfate by biochar for the degradation of phenolic compounds in aqueous systems |
| title_full | Activation of persulfate by biochar for the degradation of phenolic compounds in aqueous systems |
| title_fullStr | Activation of persulfate by biochar for the degradation of phenolic compounds in aqueous systems |
| title_full_unstemmed | Activation of persulfate by biochar for the degradation of phenolic compounds in aqueous systems |
| title_short | Activation of persulfate by biochar for the degradation of phenolic compounds in aqueous systems |
| title_sort | activation of persulfate by biochar for the degradation of phenolic compounds in aqueous systems |
| topic | Persulfate Activation Biochar Water Wastewater Matrix constituents |
| url | http://www.sciencedirect.com/science/article/pii/S2666821121001162 |
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