A submerged membrane photocatalytic reactor (SMPR) was constructed for the advanced treatment of p-nitrophenol (PNP) wastewater and rapid recycling of powdery catalyst, including a suspended photocatalytic system and a submerged microfiltration (MF) membrane system. To evaluate the performance of the SMPR, a visible-light responsive Fe(III)-ZnS/g-C₃N₄ photo-Fenton catalyst was successfully synthesized by the microwave hydrothermal method, and several techniques were used to characterize the resulting catalyst. The key operation factors on the wastewater treatment efficiency were successively optimized. When the influent PNP concentration was 10 mg·L⁻¹, initial pH was 5, catalyst dosage was 1.0 g·L⁻¹, H₂O₂ concentration was 170 mg·L⁻¹, aeration rate was 0.50 m³·h⁻¹, and operation time was 4 h, the PNP removal rate was 91.6% by the SMPR under simulated solar light irradiation. The rejection rate of the catalyst by the MF membrane was 100%, which realized the rapid separation and recycling of the suspended catalyst powders and avoided the catalyst loss and secondary pollution. The toxicity calculation results of PNP and its possible degradation products indicated that the toxicity of PNP wastewater decreased overall after the visible-light-driven photo-Fenton reactions. This study provided a combined photocatalysis-membrane filtration process that had a high treatment efficiency of refractory wastewater and solved the problem about the separation and recycling of the powdery catalyst synchronously.

建造了一个水下膜光催化反应器（SMPR），用于对硝基苯酚（PNP）废水的深度处理和粉状催化剂的快速回收，包括悬浮光催化系统和水下微滤（MF）膜系统。为了评估SMPR的性能，通过微波水热法成功合成了可见光响应性Fe（III）-ZnS / gC ₃ N ₄光芬顿催化剂，并使用了多种技术来表征所得催化剂。逐步优化了影响废水处理效率的关键因素。当进水PNP浓度为10 mg·L ^-1时，初始pH为5，催化剂用量为1.0 g·L ^-1，H₂ O ₂浓度为170 mg·L ^-1，曝气速率为0.50 m ³ ·h ^-1，操作时间为4 h，在模拟太阳光照射下，SMPR对PNP的去除率为91.6％。MF膜对催化剂的拒收率为100％，实现了悬浮催化剂粉末的快速分离和回收，避免了催化剂的损失和二次污染。PNP及其可能降解产物的毒性计算结果表明，在可见光驱动的光芬顿反应后，PNP废水的毒性总体上降低了。这项研究提供了一种组合的光催化膜过滤工艺，该工艺具有较高的难处理废水处理效率，同时解决了粉状催化剂的分离和回收问题。