Construction of Bi2O3/CuNiFe LDHs composite and its enhanced photocatalytic degradation of lomefloxacin with persulfate under simulated sunlight.
Construction of Bi2O3/CuNiFe LDHs composite and its enhanced photocatalytic degradation of lomefloxacin with persulfate under simulated sunlight.
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DOI：
10.1016/j.jhazmat.2019.121236
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发表时间：
2020-02
影响因子：
13.6
通讯作者：
Huixuan Zhang;Lichao Nengzi;Zhongjuan Wang;Xinyi Zhang;Bo Li;Xiuwen Cheng
中科院分区：
文献类型：
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作者：
Huixuan Zhang;Lichao Nengzi;Zhongjuan Wang;Xinyi Zhang;Bo Li;Xiuwen Cheng
基于光催化和硫酸盐自由基的高级氧化方法最受关注的是污染物的降解。然而，在污染物降解领域，还缺乏两种方法的耦合。本研究制备了一种新型的Bi2O3CuNiFeLDHs复合材料，它能有效地活化过硫酸盐(PS)在模拟阳光下分解洛美沙星，在自然pH条件下，当Bi2O3CuNiFeLDHs复合材料的0.4g·L−1和PS 0.74 mm时，40min内洛美沙星的降解率为84.6%(10 mg·L−1)。此外，Bi2O_3/CuNiFe LDHs复合材料具有良好的重复使用性和稳定性，至少运行4次。此外，活性自由基清除实验表明，羟基自由基(HO·)、硫酸根(SO4·−)、超氧阴离子自由基(O2·−)和空穴(h+)是低分子有机污染物降解过程中的主要自由基。随后，确定了可能的降解中间体，并提出了降解途径。同时，进行了活性污泥抑制实验，考察了氧化过程中LOM及其降解中间体的毒性变化。最后，提出了Bi2O_3/CuNiFe LDHs复合材料在模拟太阳光下激活PS的可能反应机理。
Advanced oxidation methods based on photocatalysis and sulfate radicals have attached most interest towards contaminant degradation. However, there are a lack of coupling two methods in the field of pollutant degradation. In the present study, a new Bi2O3/CuNiFe LDHs composite was fabricated and it could efficiently activate persulfate (PS) for lomefloxacin (LOM) decomposition under simulated sunlight, in which 84.6% of LOM (10 mg·L−1) was degraded over 40 min with 0.4 g·L−1of Bi2O3/CuNiFe LDHs composite and 0.74 mM of PS at natural pH. In addition, the Bi2O3/CuNiFe LDHs composite possessed good reusability and stability at least four runs. Moreover, active radical scavenging experiments indicated that hydroxyl radicals (HO·), sulfate radicals (SO4·−), superoxide radicals (O2·−) and hole (h+) were the main radicals under LOM degradation process. Subsequently, the possible degradation intermediates were determined and the decomposition pathways were put forward. At the same time, activated sludge inhibition experiments were performed to assess the variation of toxicity of LOM and its degradation intermediates during oxidation. Finally, possible reaction mechanism of Bi2O3/CuNiFe LDHs composite for PS activation under simulated sunlight was proposed.