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Comparison of aniline removal by UV/CaO2 and UV/H2O2: Degradation kinetics and mechanism.
Chemosphere ( IF 8.1 ) Pub Date : 2020-05-06 , DOI: 10.1016/j.chemosphere.2020.126983 Gang Xue 1 , Minghui Zheng 2 , Yajie Qian 2 , Qian Li 2 , Pin Gao 2 , Zhenhong Liu 2 , Hong Chen 2 , Xiang Li 1
Chemosphere ( IF 8.1 ) Pub Date : 2020-05-06 , DOI: 10.1016/j.chemosphere.2020.126983 Gang Xue 1 , Minghui Zheng 2 , Yajie Qian 2 , Qian Li 2 , Pin Gao 2 , Zhenhong Liu 2 , Hong Chen 2 , Xiang Li 1
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The instability and rapid consumption of H2O2 limit the application of UV/H2O2 in water treatment. Recently, calcium peroxide (CaO2) has been demonstrated as an effective source of H2O2. However, the performance and mechanism of UV/CaO2 are still unknown. Herein, UV/CaO2 and UV/H2O2 were compared for degradation of aniline. The removal efficiency of aniline by UV/CaO2 was slightly lower than that by UV/H2O2, which could be attributed to the light scavenger by CaO2 suspended particles. HO‧ was identified to participate in aniline degradation in both UV/CaO2 and UV/H2O2, while O2-· was only involved in UV/CaO2. The efficiency of aniline degradation in UV/CaO2 was affected by the released H2O2 in the system. The release and decomposition rate of H2O2 in UV/CaO2 system were influenced by the CaO2 dosage and reaction pH, but slightly related with water matrix. Excessive CaO2 would scavenge aniline degradation through the released H2O2 to react with HO‧. Acidic condition would enhance the concentration of H2O2 in UV/CaO2 and promote the degradation of aniline. Cl- showed slight and almost no effect on aniline degradation in UV/CaO2 and UV/H2O2 systems, respectively, while HCO3- scavenged aniline degradation in UV/CaO2. NO3- inhibited aniline degradation in both UV/CaO2 and UV/H2O2. Compared to UV/H2O2, UV/CaO2 shows the similar efficiency on organics removal but conquers the limitations in UV/H2O2, which is a promising alternative choice in water treatment.
中文翻译：
UV / CaO2和UV / H2O2去除苯胺的比较：降解动力学和机理。
H2O2的不稳定性和快速消耗限制了UV / H2O2在水处理中的应用。最近，过氧化钙（CaO2）已被证明是H2O2的有效来源。但是，UV / CaO2的性能和机理仍然未知。在此，比较了UV / CaO 2和UV / H 2 O 2对苯胺的降解。UV / CaO2对苯胺的去除效率略低于UV / H2O2，这可以归因于CaO2悬浮颗粒对光的清除作用。HO‧被确定参与UV / CaO2和UV / H2O2中的苯胺降解，而O2-·仅参与UV / CaO2。苯胺在UV / CaO2中的降解效率受到系统中释放的H2O2的影响。CaO2用量和反应pH对UV / CaO2体系中H2O2的释放和分解速率有影响，但与水基质略相关。过量的CaO2会通过释放的H2O2清除苯胺降解，从而与HO‧反应。酸性条件会提高UV / CaO2中H2O2的浓度并促进苯胺的降解。Cl-分别对UV / CaO2和UV / H2O2系统中的苯胺降解几乎没有影响，而HCO3清除了UV / CaO2中的苯胺降解。NO3-抑制UV / CaO2和UV / H2O2中苯胺的降解。与UV / H2O2相比，UV / CaO2在去除有机物方面具有相似的效率，但克服了UV / H2O2的局限性，这是水处理中一个有希望的替代选择。Cl-分别对UV / CaO2和UV / H2O2系统中的苯胺降解几乎没有影响，而HCO3清除了UV / CaO2中的苯胺降解。NO3-抑制UV / CaO2和UV / H2O2中苯胺的降解。与UV / H2O2相比，UV / CaO2在去除有机物方面具有相似的效率，但克服了UV / H2O2的局限性，这是水处理中一个有希望的替代选择。Cl-分别对UV / CaO2和UV / H2O2系统中的苯胺降解几乎没有影响，而HCO3清除了UV / CaO2中的苯胺降解。NO3-抑制UV / CaO2和UV / H2O2中苯胺的降解。与UV / H2O2相比，UV / CaO2在去除有机物方面具有相似的效率，但克服了UV / H2O2的局限性，这是水处理中一个有希望的替代选择。
更新日期：2020-05-06
中文翻译：
UV / CaO2和UV / H2O2去除苯胺的比较：降解动力学和机理。
H2O2的不稳定性和快速消耗限制了UV / H2O2在水处理中的应用。最近，过氧化钙（CaO2）已被证明是H2O2的有效来源。但是，UV / CaO2的性能和机理仍然未知。在此，比较了UV / CaO 2和UV / H 2 O 2对苯胺的降解。UV / CaO2对苯胺的去除效率略低于UV / H2O2，这可以归因于CaO2悬浮颗粒对光的清除作用。HO‧被确定参与UV / CaO2和UV / H2O2中的苯胺降解，而O2-·仅参与UV / CaO2。苯胺在UV / CaO2中的降解效率受到系统中释放的H2O2的影响。CaO2用量和反应pH对UV / CaO2体系中H2O2的释放和分解速率有影响，但与水基质略相关。过量的CaO2会通过释放的H2O2清除苯胺降解，从而与HO‧反应。酸性条件会提高UV / CaO2中H2O2的浓度并促进苯胺的降解。Cl-分别对UV / CaO2和UV / H2O2系统中的苯胺降解几乎没有影响，而HCO3清除了UV / CaO2中的苯胺降解。NO3-抑制UV / CaO2和UV / H2O2中苯胺的降解。与UV / H2O2相比，UV / CaO2在去除有机物方面具有相似的效率，但克服了UV / H2O2的局限性，这是水处理中一个有希望的替代选择。Cl-分别对UV / CaO2和UV / H2O2系统中的苯胺降解几乎没有影响，而HCO3清除了UV / CaO2中的苯胺降解。NO3-抑制UV / CaO2和UV / H2O2中苯胺的降解。与UV / H2O2相比，UV / CaO2在去除有机物方面具有相似的效率，但克服了UV / H2O2的局限性，这是水处理中一个有希望的替代选择。Cl-分别对UV / CaO2和UV / H2O2系统中的苯胺降解几乎没有影响，而HCO3清除了UV / CaO2中的苯胺降解。NO3-抑制UV / CaO2和UV / H2O2中苯胺的降解。与UV / H2O2相比，UV / CaO2在去除有机物方面具有相似的效率，但克服了UV / H2O2的局限性，这是水处理中一个有希望的替代选择。
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