复合TiO2/活性炭纤维作为光催化剂在顺序吸附/光催化过程中去除环丙沙星

Thibaut Triquet, C. Tendero, L. Latapie, R. Richard, C. Andriantsiferana
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引用次数: 1

摘要

本文报道了活性炭纤维与沉积TiO2的顺序吸附/光催化工艺去除水中抗生素环丙沙星(CIP)的性能。选择商用活性炭纤维(ACF10)作为载体,采用金属有机化学气相沉积(MOCVD)法制备TiO2涂层。实验采用单色led (365nm)光催化反应器进行。研究了两种不同的工艺:吸附/光解和吸附/光催化。目的是完全去除CIP,并通过跟踪液相中芳香族转化产物(atp)、脂肪酸、氟化物和TOC的形成/消除来评估处理效率。ACF10对CIP的吸附动力学较慢(24 h吸附71%,20 d吸附全部)。外扩散限制模型与实验曲线(kext = 0.0056 h-1)拟合良好,表明由于纤维组织紧密,存在外转移限制。在吸附/光解过程中,浓度显著降低(照射6 h后达到95%),但在液相中检测到10种不同的atp。为了消除CIP,需要24小时的吸附和6小时的辐照,但大部分atp仍留在溶液中(总处理时间:72小时)。对于ACF10-TiO2,溶液中存在相同的atp,并在6小时的辐照步骤(总处理时间:30小时)后被消除。在处理结束时,发现存在几种无毒的脂肪酸,表明该顺序过程的效率更高。液相中存在大量氟,表明吸附分子(CIP和转化产物)发生了一些表面光化学反应,复合材料发生了部分再生。
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The Use of Composite TiO2/Activated Carbon Fibers as a Photocatalyst in a Sequential Adsorption/Photocatalysis Process for the Elimination of Ciprofloxacin
This work reports the performance of a sequential adsorption/photocatalysis process using activated carbon fibers with deposited TiO2 for the elimination of the antibiotic ciprofloxacin (CIP) in water. A commercial activated carbon fiber (ACF10) was selected as the support, and a TiO2 coating was synthesized using Metal Organic Chemical Vapor Deposition (MOCVD). Experiments were carried out using a photocatalytic reactor irradiated with monochromatic LEDs (365nm). Two different processes have been studied: adsorption/photolysis and adsorption/photocatalysis. The objective was to completely remove the CIP and to evaluate the efficiency of the treatment by following the formation/elimination of aromatic transformation products (ATPs), aliphatic acids, fluoride, and the TOC in the liquid phase. The adsorption kinetic of the CIP by ACF10 was rather slow (71% of CIP adsorbed by 24 h and total adsorption by 20 days). A good fit between the external diffusion limitation model and the experimental curve (kext = 0.0056 h-1) showed an external transfer limitation due to a tight weave of fibers. For the adsorption/photolysis process, a significant decrease of the concentration was achieved (95% after 6 h of irradiation), but ten different ATPs were detected in the liquid phase. To eliminate CIP, 24 h of adsorption and 6 h of irradiation were then necessary, but most of the ATPs remained in solution (total treatment duration: 72 h). With ACF10-TiO2, the same ATPs were present in solution and were eliminated after the 6 h irradiation step (total treatment duration: 30 h). At the end of the treatment, several non-toxic aliphatic acids were found to be present, showing the higher efficiency of this sequential process. The presence of a significant amount of fluorine in the liquid phase suggests some surface photochemical reactions of the adsorbed molecules (CIP and transformation products) and a partial regeneration of the composite material.
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