College of Resources and Environment, Shanxi Agricultural University, Shanxi, People's Republic of China.
Shanghai Institute of Pollution Control and Ecological Security, Shanghai, China.
Environ Technol. 2021 Mar;42(7):1084-1091. doi: 10.1080/09593330.2019.1652698. Epub 2019 Aug 27.
Degradation of OTC under different light with Fe/ was investigated, and the reaction mechanism was also discussed. Although Fe(II/III)- complex could weaken the inhibitory effect of Fe(II/III)-OTC complex on the detection of OTC by HPLC, the acidification could make inhibition become minimal. Response surface methodology was used to optimize the Fe/ dosage at low concentrations of Fe and HCO. When the OTC concentration was 0.04 mM, the optimal dosage was OTC:Fe:HCO= 1:1.25:2 to attain a removal rate of 80% after 60 min under simulated solar light, and HO for degradation of OTC with Fe/ could be 53%, furthermore, removal rate of OTC just increased 3 percentage points at 60 min when the simulated solar light changed into UV-254 nm, however, OTC could also be degraded for 48.89% removal rate after 3 h illumination of simulated visible light. The influence of Cl, , , , , or on the degradation of OTC with Fe/ under simulated solar light was studied. could inhibit degradation for could react with free radicals, but the reason of inhibition of degradation by , or was its influence on pH, whereas Cl, and had no influence on degradation. In addition, when the concentration of was higher than 4 mM, could promote the degradation for the direct photolysis of OTC at alkaline (pH > 10). Four products were detected by LC-MS, and the OTC degradation pathway was discussed.
研究了 Fe/在不同光照下对 OTC 的降解情况，并探讨了反应机制。尽管 Fe(II/III)-配合物可以削弱 Fe(II/III)-OTC 配合物对 OTC 通过 HPLC 检测的抑制作用，但酸化可以使抑制作用最小化。响应面法用于优化低浓度 Fe 和 HCO 下的 Fe/用量。当 OTC 浓度为 0.04mM 时，最佳用量为 OTC:Fe:HCO=1:1.25:2，在模拟太阳光下 60min 后去除率达到 80%，Fe/降解 OTC 的 HO 可达到 53%，此外，当模拟太阳光变为 UV-254nm 时，60min 时 OTC 的去除率仅增加 3 个百分点，但模拟可见光照射 3 小时后，OTC 的去除率也可达到 48.89%。研究了 Cl、、、、或在模拟太阳光下对 Fe/降解 OTC 的影响。可以抑制降解，因为可以与自由基反应，但、或抑制降解的原因是它们对 pH 的影响，而 Cl、和没有影响。此外，当浓度高于 4mM 时，由于 OTC 在碱性条件下（pH>10）的直接光解，可促进降解。通过 LC-MS 检测到了 4 种产物，并讨论了 OTC 的降解途径。
