20.500.12556/RUL-168397 Challenges and contribution of electrochemical driven by-products in tannery wastewater treatment optimization, detection and distribution of reactive oxidation species Electrochemical oxidation (EO) is an excellent approach for the treatment of persistent pollutant from synthesistic and real wastewater than conventional wastewater treatment processes. Chloride and sulfate salts generally used and present in natural wastewater that affect the EO process. In this research, the effect of electrolyte concentration on active sulfate (SO$_4^{2⁻}$) species (HSO$_4^⁻$, SO$_4^{•⁻}$ and S$_2$O$_8^{2⁻}$) formation, chlorinated byproducts distribution (ClO$_4^−$, ClO$_3^−$, Cl$_2$), and tannery effluent degradation have been examined while using graphite electrodes. A full factorial design was used to optimize the three independent factors, namely: initial pH (pH$_o$): 3–11, current (I): 1–3 A, and electrolysis time (t): 20–110 min for the responses of chemical oxygen demand (COD) and chromium (Cr) removal. Under the optimum treatment conditions of 3 A current, 90 min electrolysis time, 600 mg L$^{−1}$ Na$_2$SO$_4$ concentration and pH$_o$ of 7, more than 88% COD and 90% Cr removal were achieved under optimal conditions. Qualitative and quantitative analysis confirmed the formation and distribution of various reactive oxidation species and a plausible mechanism was discussed. EO processes yielded almost total mineralization due to the synergistic action of generated active chlorine, sulfate species and hydroxyl radicals. A relatively higher amount of ClO$_3$$^⁻$ was occurred that sign the efficient $^•$OH generation in sulfate mediated EO because the ClO$_3$$^⁻$ formation is certainly associated to $^•$OH concentration. Overall results demonstrate that sulfate enriched electrolyte systems are helpful for EO of hazardous organic pollutants. synthetic tannery wastewater hydroxyl $^•$OH sulfate SO$_4^{2•-}$ electrochemical oxidation reactive oxidation species sintetične usnjarske odpadne vode hidroksilna skupina sulfati elektrokemijska oksidacija reaktivne oksidacijske skupine true false true Angleški jezik Slovenski jezik Članek v reviji 2025-04-11 11:21:01 2025-04-11 11:21:02 2025-04-12 04:11:17 0000-00-00 00:00:00 2025 0 0 10 str. Vol. 376, art. 124381 Mar. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 628.349:66.087.3 1095-8630 10.1016/j.jenvman.2025.124381 232135683 1-s2.0-S0301479725003573-main.pdf 1-s2.0-S0301479725003573-main.pdf 1 8AABC7E17BB1AF77F1F5DF01A8C2068A 8f6f06b4dae2169f42055be1dfe26c507094521cc347390ca08097a2921de59c 82a4ef08-16b5-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=201784 https://www.sciencedirect.com/science/article/pii/S0301479725003573 1 31737a3f-16b5-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=201783 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0