Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, PR China; Jilin Provincial Key Laboratory of Water Resources and Environment, Jilin University, Changchun, 130021, PR China; State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China.
Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, PR China; Jilin Provincial Key Laboratory of Water Resources and Environment, Jilin University, Changchun, 130021, PR China.
Environ Res. 2022 Mar;204(Pt A):111971. doi: 10.1016/j.envres.2021.111971. Epub 2021 Sep 2.
Intimately coupled photocatalysis and biodegradation (ICPB) is an attractive novel technology for the mineralization and detoxification of persistent organics. Good photocatalytic performance is essential for an advanced ICPB operation, and the photocatalyst coating and illumination conditions are strong determining factors. In this work, response surface methodology (RSM) involving the central composite design (CCD) was employed to discover optimal operating conditions, by using tetracycline hydrochloride (TCH) as the model pollutant. Polyvinyl butyral (PVB) was employed to form an adhesion layer, enhancing P25 TiO2 activity and stability. We achieved the optimal coating conditions with a mixing time of 20 h, TiO dosage of 8 g/L, and PVB concentration of 0.5 wt.%. The optimum running conditions for an ICPB-reactor were found to be at a carrier volume ratio of 40% and light intensity of 6000 μw/cm. These conditions were essential for the production of desired intermediates and functional microbial survival. At the optimized parameters ranges, ∼98% TCH removal and ∼40% mineralization was achieved, and the inhibition on Q67 illuminance was only 30.32%. This is the first work on optimizing the fabrication and operation of ICPB, which is meaningful for the application of ICPB in practical engineering.
紧密偶联光催化和生物降解（ICPB）是一种有吸引力的新型技术，可用于持久有机物的矿化和解毒。良好的光催化性能对于先进的 ICPB 操作至关重要，而光催化剂涂层和照明条件是强烈的决定因素。在这项工作中，采用中心复合设计（CCD）的响应面法（RSM）被用来发现最佳操作条件，使用盐酸四环素（TCH）作为模型污染物。使用聚乙烯醇丁醛（PVB）形成附着层，提高了 P25 TiO2 的活性和稳定性。我们实现了最佳的涂层条件，混合时间为 20 h，TiO2 用量为 8 g/L，PVB 浓度为 0.5 wt.%。发现 ICPB 反应器的最佳运行条件为载体体积比为 40%和光强度为 6000 μw/cm。这些条件对于产生所需的中间产物和功能微生物的生存至关重要。在优化的参数范围内，TCH 的去除率约为 98%，矿化率约为 40%，对 Q67 照度的抑制率仅为 30.32%。这是首次对 ICPB 的制造和操作进行优化，对于 ICPB 在实际工程中的应用具有重要意义。
