Preparation of photocatalytic ozonation SiC foam and its application in levofloxacin degradation
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摘要: 针对抗生素难以降解而造成环境污染问题，以左氧氟沙星（Levofloxacin，LEV）为目标污染物，制备Ce-TiO2 /SiC泡沫陶瓷复合材料，并由此构建光催化臭氧氧化耦合体系（Ce-TiO2/SiC + LED + O3）. 结果表明，该耦合体系能有效降解LEV，去除率为99%，化学需氧量（Chemical Oxygen Demand，COD）降解率高达85.9%. 该耦合体系体现了较高的协同效应，其一级反应动力学速率常数大于臭氧氧化（O3）与光催化（Ce-TiO2/SiC + LED）之和. 另外，Ce-TiO2 /SiC泡沫陶瓷的稳定性实验表明，在5次重复使用实验后，光催化臭氧氧化活性基本不变.Abstract: To solve the problem of environmental pollution caused by the difficult degradation of antibiotics, Ce-TiO2/SiC foam was prepared, levofloxacin (Levofloxacin, LEV) was chosen as the target pollutant, and a photocatalytic ozonation coupling system (Ce-TiO2/SiC + LED + O3) was studied. The results show that the coupling system can effectively degrade LEV, the LEV removal was 99% and the chemical oxygen demand (COD) removal was as high as 85.9%. The coupling system showed a good synergistic effect, and its first-order reaction kinetic rate constant was greater than the sum of ozonation (O3) and photocatalysis (Ce-TiO2/SiC + LED). In addition, the stability experiment of Ce-TiO2/SiC foam showed that the photocatalytic ozonation activity is basically unchanged after five reuses.
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图 1 光催化耦合臭氧催化实验装置图
a—烧杯和磁力搅拌器；b—蠕动泵；c—反应器；d—LED灯罩；e—Ce-TiO2/SiC泡沫陶瓷；f—臭氧破坏器；g—臭氧浓度检测器；h—臭氧发生器；i—氧气瓶.
Figure 1. Experimental set-up of photocatalytic ozonation reactor
图 4 SiC和Ce-TiO2/SiC的紫外−可见吸收光谱和带隙图
Figure 4. UV-Vis absorption spectrum and band gap of SiC and Ce-TiO2/SiC
图 5 SiC和Ce-TiO2/SiC的N2等温吸附脱附曲线和孔径分布图
Figure 5. N2 adsorption–desorption isotherms and pore size distribution of SiC and Ce-TiO2/SiC
表 1 实验试剂
Table 1. Laboratory reagents
试剂名称 纯度 供应单位 无水乙醇 分析纯 ≥ 99.7% 上海泰坦科技股份有限公司 钛酸四丁酯 分析纯 99% 上海泰坦科技股份有限公司 六水合硝酸铈 分析纯 99% 上海泰坦科技股份有限公司 冰醋酸 分析纯 99% 上海泰坦科技股份有限公司 聚乙二醇 化学纯 国药集团化学试剂有限公司 左氧氟沙星 分析纯 ≥ 98.0% 阿拉丁试剂（上海）有限公司 COD检测试剂 — 北京连华科技有限公司 SiC泡沫陶瓷 — 铬晶新材料有限公司 
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表 2 不同降解方法降解LEV的比较总结
Table 2. Summary of comparison of different methods for degrading LEV
降解方法 LEV去除率/% kLEV × 10−2
/min−1R12 COD降解率/% kCOD × 10−3
/min−1R22 LED 2.6 0.02 0.9594 0 — — O3 98.7 2.54 0.9832 52.2 3.86 0.9732 (10%)Ce-TiO2/SiC + LED 53.1 0.20 0.9907 44.2 1.15 0.9709 (10%)Ce-TiO2/SiC + O3 99.6 2.98 0.9778 81.8 7.24 0.9311 (10%)Ce-TiO2/SiC + LED + O3 99.8 3.23 0.9857 85.9 8.44 0.9853
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