Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, Chongqing University, Chongqing 400045, China.
Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, Chongqing University, Chongqing 400045, China.
Chemosphere. 2019 Jan;215:647-656. doi: 10.1016/j.chemosphere.2018.10.047. Epub 2018 Oct 13.
Sodium percarbonate (SPC)-based advanced oxidation process has been applied to the wastewater treatment in recent years. In the present study, a novel catalyst utilization of vanadium(V) was investigated for the activation of SPC for aniline degradation. The mechanism of SPC activation by V(IV) was demonstrated, and the major free radicals were identified through scavenging tests and electron paramagnetic resonance (EPR) analysis. The performance of aniline degradation was evaluated in the V(IV)/HO and V(IV)/HO/NaCO systems and compared with that of the V(IV)/SPC system. The influences of initial pH and effects of inorganic anions were also studied. The results show that aniline could be decomposed efficiently by SPC activated with V(IV) and the degradation efficiency increased with the increase in V(IV) and SPC dosage. O, CO, and OH were found to participate in aniline degradation, and O and CO were confirmed to be the predominant species. The decomposition of aniline was enhanced when equal amount of HO was utilized instead of SPC under acidic condition while a comparative behavior was achieved in the V(IV)/HO/NaCO system. Furthermore, aniline degradation was not impacted significantly by the initial pH and addition of Cl, SO and NO, while HCO led to a betterment of aniline removal. These results indicate that the V(IV)/SPC system is an effective and promising approach for the removal of aniline from water for its feasibility and stability, which achieves eliminating contaminants by another waste.
过碳酸钠（SPC）基高级氧化工艺近年来已应用于废水处理。本研究中，研究了一种新型催化剂——四价钒（V）在过碳酸钠（SPC）活化中的应用，用于苯胺降解。通过猝灭试验和电子顺磁共振（EPR）分析，证实了 SPC 被 V（IV）活化的机制，并确定了主要的自由基。通过 V（IV）/HO 和 V（IV）/HO/NaCO 体系评估了苯胺降解的性能，并与 V（IV）/SPC 体系进行了比较。还研究了初始 pH 的影响和无机阴离子的影响。结果表明，V（IV）活化的 SPC 可以有效地分解苯胺，并且随着 V（IV）和 SPC 剂量的增加，降解效率增加。发现 O、CO 和 OH 参与了苯胺的降解，并且 O 和 CO 被确认为主要的物种。在酸性条件下，当等量的 HO 被利用而不是 SPC 时，苯胺的分解得到增强，而在 V（IV）/HO/NaCO 体系中则达到了类似的效果。此外，初始 pH 和添加的 Cl、SO 和 NO 对苯胺降解的影响不大，而 HCO 的添加则改善了苯胺的去除。这些结果表明，V（IV）/SPC 体系是一种有效且有前途的去除水中苯胺的方法，因为它具有可行性和稳定性，可以通过另一种废物来消除污染物。
