NO3- photolysis-induced advanced reduction process removes NO3- and 2, 4, 6-tribromophenol.
NO3- photolysis-induced advanced reduction process removes NO3- and 2, 4, 6-tribromophenol.
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DOI：
10.1016/j.chemosphere.2021.132633
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发表时间：
2021-10
期刊：
影响因子：
8.8
通讯作者：
Yawei Xie;Shi-Qin Hu;Dehua Ma;Rui Liu;Can-can Xu;Hongyuan Liu
中科院分区：
文献类型：
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作者：
Yawei Xie;Shi-Qin Hu;Dehua Ma;Rui Liu;Can-can Xu;Hongyuan Liu
还原过程是一种重要的污染物去除技术，特别是对于有机卤素。NO3−是一种阴离子和污染物，通常存在于废水中。在这项研究中，一种新的先进的还原过程（阿普）诱导NO3-光解去除2，4，6-三溴苯酚（TBP）和NO3-。UV/NO3−/甲酸（FA）工艺实现了NO3−的去除，并提高了TBP（初始TBP浓度= 0.1 mM）的脱溴率（高达97.8%），然而，它们的共存对各组分的还原去除产生了不利影响。酸性条件（本研究中pH为3）有利于NO3−的去除和TBP的脱溴。Cl-促进了UV/NO3-/FA体系中NO3-的去除，但使TBP的脱溴效果降低了27.8%。腐殖酸是一种典型的溶解性有机物，在所有实验条件下抑制NO3−去除、TBP降解和脱溴。甲基紫精显著抑制阿普的性能，证实了CO2·-在阿普中的作用。在不同条件下，NO3-还原不足和过度，在TBP的影响下，NH 4+生成量增加。数据还表明，多达80%的被去除的NO3-转化为NO2-，这是值得注意的。由于FA氧化产生的还原性自由基，在出水中检测到TBP的氧化和还原产物。该研究结果为从富含NO3−的废水中还原去除有机卤素提供了一种潜在的技术。
Reductive processes are an important type of pollutant removal technology, particularly for organic halogens. NO3−is an anion and pollutant that is commonly present in wastewater. In this study, a novel advanced reduction process (ARP) induced by NO3−photolysis was developed to remove 2,4,6-tribromophenol (TBP) and NO3−. The UV/NO3−/formate acid (FA) process achieved NO3−removal and improved the debromination of TBP (initial TBP concentration = 0.1 mM) (up to 97.8%), however, their coexistence adversely affected the reductive removal of each component. Acidic conditions (pH 3 in this study) benefited the removal of NO3−and the debromination of TBP. Cl−promoted NO3−removal in UV/NO3−/FA, however, it decreased the debromination effect of TBP by 27.8%. Humic acid, a typical dissolved organic matter, suppressed NO3−removal, TBP degradation and debromination under all experimental conditions. Methyl viologen significantly inhibited the performance of ARP, and this verified the role of CO2•-in this ARP. Insufficient reduction and over-reduction of NO3−were observed under different conditions and a greater amount of NH4+was formed under the influence of TBP. The data also indicated that as much as 80% of the removed NO3−was converted to NO2−, and this is noteworthy. Due to the reductive radicals generated from the oxidation of FA, both oxidative and reductive products of TBP were detected in the effluent. The results of this study provide a potential technology for the reductive removal of organic halogens from NO3−-rich wastewater.