Continuous Catalytic Ozonation of Antibiotics Using Mn and Cu Oxides on γ-Al2O3 Pellets in a Micropacked Bed Reactor,ACS ES&T Water

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Continuous Catalytic Ozonation of Antibiotics Using Mn and Cu Oxides on γ-Al2O3 Pellets in a Micropacked Bed Reactor
ACS ES&T Water ( IF 4.8 ) Pub Date : 2021-07-30 , DOI: 10.1021/acsestwater.1c00141
Qiang Cao _{1,

2,

3} , Fengyan Lou ₂ , Na Liu _{1,

3} , Jisong Zhang ₂ , Lidong Wu ₁

Affiliation

Today, the Al₂O₃-supported catalyst in the heterogeneous catalytic ozonation system attracts attention due to its stable structure and relatively high surface activity. Herein, Mn and Cu oxides loaded on γ-Al₂O₃ pellets were prepared using an impregnation method to improve the removal efficiency in a micropacked bed reactor (μPBR). The effects of the initial pH, the ratio of O₃ to chemical oxygen demand (COD), and HO• scavenger on the catalytic performance were investigated. Experimental results showed that the MnO₂/γ-Al₂O₃ and CuO/γ-Al₂O₃ catalysts exhibited excellent catalytic performance. The COD removal efficiencies were 86.3% for CuO/Al₂O₃, 76.9% for MnO₂/Al₂O₃, 71.6% for Al₂O₃, and 35.8% for ozone alone within 71 s. Compared with those of batch reactors, the apparent degradation rate constant of COD with prepared catalysts in a μPBR increased by 2–3 orders of magnitude. In addition, the CuO/γ-Al₂O₃ catalyst maintained a relatively stable activity in the continuous flow test for a long time (100 h). Finally, some typical antibiotics were treated by catalytic ozonation in a μPBR. The removal efficiencies of these antibiotics and COD reached approximately 100.0% and 62.9–87.8% within 71 s, respectively. Thus, the continuous catalytic ozonation system with the CuO/γ-Al₂O₃ catalyst based on μPBRs could be a promising pathway for the treatment of industrial wastewater with antibiotics.

中文翻译：

在微填充床反应器中使用 Mn 和 Cu 氧化物在 γ-Al2O3 颗粒上连续催化臭氧化抗生素

如今，多相催化臭氧化系统中负载Al ₂ O _{3 的}催化剂因其稳定的结构和相对较高的表面活性而备受关注。在此，使用浸渍法制备了负载在 γ-Al ₂ O ₃球团上的 Mn 和 Cu 氧化物，以提高微填充床反应器 (μPBR) 中的去除效率。研究了初始 pH 值、O ₃与化学需氧量 (COD)的比率以及 H2O• 清除剂对催化性能的影响。实验结果表明，MnO ₂ /γ-Al ₂ O ₃和CuO/γ-Al ₂ O ₃催化剂表现出优异的催化性能。的COD去除率为86.3％的CuO为/ Al的₂ ö ₃，76.9％的MnO为₂ / Al的₂ ø ₃，为的Al 71.6％₂ ö ₃，以及用于单独臭氧内71号35.8％。与间歇式反应器相比，在 μPBR 中制备的催化剂的 COD 表观降解速率常数增加了 2-3 个数量级。此外，CuO/γ-Al ₂ O ₃催化剂在连续流动试验中长时间（100 h）保持相对稳定的活性。最后，一些典型的抗生素在 μPBR 中通过催化臭氧化处理。这些抗生素和 COD 的去除率在 71 秒内分别达到约 100.0% 和 62.9-87.8%。因此，基于μPBRs的CuO/γ-Al ₂ O ₃催化剂连续催化臭氧化系统可能是用抗生素处理工业废水的有希望的途径。

更新日期：2021-08-13

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