Comparison of aniline removal by UV/CaO2 and UV/H2O2: Degradation kinetics and mechanism.
Comparison of aniline removal by UV/CaO2 and UV/H2O2: Degradation kinetics and mechanism.
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DOI：
10.1016/j.chemosphere.2020.126983
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发表时间：
2020-05
期刊：
影响因子：
8.8
通讯作者：
G. Xue;M. Zheng;Yajie Qian;Qian Li;Pin Gao;Zhen-hong Liu;Hong Chen;Xiang Li
中科院分区：
文献类型：
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作者：
G. Xue;M. Zheng;Yajie Qian;Qian Li;Pin Gao;Zhen-hong Liu;Hong Chen;Xiang Li
H2O2的不稳定和快速消耗限制了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。然而，UV/CaO2的性能和机理仍不清楚。本文比较了 UV/CaO2 和 UV/H2O2 对苯胺的降解。 UV/CaO2对苯胺的去除效率略低于UV/H2O2，这可能归因于CaO2悬浮颗粒的光清除作用。 HO·被确定参与UV/CaO2和UV/H2O2中的苯胺降解，而O2-·仅参与UV/CaO2。 UV/CaO2 中苯胺的降解效率受到系统中释放的 H2O2 的影响。 UV/CaO2体系中H2O2的释放和分解速率受CaO2用量和反应pH的影响，与水基质略有相关。过量的CaO2会通过释放的H2O2与H2O反应来清除苯胺的降解。酸性条件会提高UV/CaO2中H2O2的浓度，促进苯胺的降解。 Cl–分别对UV/CaO2和UV/H2O2系统中的苯胺降解表现出轻微且几乎没有影响，而HCO3–则清除了UV/CaO2系统中的苯胺降解。 NO3 在 UV/CaO2 和 UV/H2O2 中均抑制苯胺降解。与UV/H2O2相比，UV/CaO2在有机物去除方面表现出相似的效率，但克服了UV/H2O2的局限性，是水处理中一种有前途的替代选择。
The instability and rapid consumption of H2O2limit the application of UV/H2O2in water treatment. Recently, calcium peroxide (CaO2) has been demonstrated as an effective source of H2O2. However, the performance and mechanism of UV/CaO2are still unknown. Herein, UV/CaO2and UV/H2O2were compared for degradation of aniline. The removal efficiency of aniline by UV/CaO2was slightly lower than that by UV/H2O2, which could be attributed to the light scavenger by CaO2suspended particles. HO‧ was identified to participate in aniline degradation in both UV/CaO2and UV/H2O2, while O2-· was only involved in UV/CaO2. The efficiency of aniline degradation in UV/CaO2was affected by the released H2O2in the system. The release and decomposition rate of H2O2in UV/CaO2system were influenced by the CaO2dosage and reaction pH, but slightly related with water matrix. Excessive CaO2would scavenge aniline degradation through the released H2O2to react with HO‧. Acidic condition would enhance the concentration of H2O2in UV/CaO2and promote the degradation of aniline. Cl–showed slight and almost no effect on aniline degradation in UV/CaO2and UV/H2O2systems, respectively, while HCO3–scavenged aniline degradation in UV/CaO2. NO3–inhibited aniline degradation in both UV/CaO2and UV/H2O2. Compared to UV/H2O2, UV/CaO2shows the similar efficiency on organics removal but conquers the limitations in UV/H2O2, which is a promising alternative choice in water treatment.