Laboratory of Industrial Chemistry, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece.
Institute of Environment and Sustainable Development, University Research Center of Ioannina (URCI), 45110 Ioannina, Greece.
Molecules. 2023 Jan 25;28(3):1170. doi: 10.3390/molecules28031170.
The objective of this work was to evaluate the efficiency of a solar photocatalytic process using g-CN as photocatalyst on the degradation of pharmaceutical compounds detected in hospital wastewater treatment plant secondary effluents. A compound parabolic collector pilot plant, established in the secondary effluent stream of the Ioannina city hospital wastewater treatment plant, was used for the photocatalytic experiments. The analysis of the samples before and after the photocatalytic treatment was accomplished using solid phase extraction (SPE), followed by UHPLC-LTQ/Orbitrap HRMS. Initial effluent characterization revealed the presence of ten pharmaceutical compounds. Among these, amisulpride, O-desmethyl venlafaxine, venlafaxine and carbamazepine were detected in all experiments. Initial concentrations ranged from 73 ng L for citalopram to 2924.53 ng L for O-desmethyl venlafaxine. The evolution of BOD and COD values were determined before and after the photocatalytic treatment. All detected pharmaceuticals were removed in percentages higher than 54% at an optimum catalyst loading ranging between 200 and 300 mg L. The potential of the catalyst to be reused without any treatment for two consecutive cycles was studied, showing a significant efficiency decrease.
本工作旨在评估使用 g-CN 作为光催化剂的太阳能光催化工艺在降解医院污水处理厂二级出水中检测到的药物化合物方面的效率。在伊奥尼亚纳市医院污水处理厂二级出水流中建立了复合抛物面集热器中试装置，用于光催化实验。使用固相萃取 (SPE) 对光催化处理前后的样品进行分析，然后采用 UHPLC-LTQ/Orbitrap HRMS。初始流出物特性分析表明存在十种药物化合物。其中，在所有实验中均检测到氨磺必利、O-去甲文拉法辛、文拉法辛和卡马西平。初始浓度范围为西酞普兰 73ng/L 至 O-去甲文拉法辛 2924.53ng/L。在光催化处理前后测定了 BOD 和 COD 值的变化。在最佳催化剂负载量为 200 至 300mg/L 时，所有检测到的药物化合物的去除率均高于 54%。还研究了催化剂在无需任何处理的情况下连续两个循环重复使用的潜力，结果表明其效率显著下降。
