漂浮陶粒负载氧化钛光催化降解对硝基苯酚试验研究

Study on Photocatalytic Degradation of P-Nitrophenol by Floating Ceramsite Supported Titanium Oxide

摘要: 本文研究了漂浮陶粒负载氧化钛样品光催化处理有机废水的影响因素和最佳处理工艺条件。结果表明，氧化钛煅烧600℃，100 mL废水氧化钛的负载量为870 mg/100 g陶粒，pH = 4，暗反应30 min，15 W的紫外灯下光催化1.5 h，对硝基苯酚废水浓度15 mg/L去除率达到74%。在最佳处理工艺的基础上，对回收的陶粒二次负载进行反应动力学研究，实验结果表明二氧化钛光催化处理对硝基苯酚仍然有一定的降解效果。对最佳处理条件下的样品进行X射线衍射(XRD)和扫描电子显微镜(SEM)表征，发现用溶胶–凝胶法制备氧化钛大量负载到多孔陶粒上负载量增大，不易脱落。在有机废水处理过程中，陶粒可以回收再生重复利用，并且能达到一定的降解率，既环保又高效，对处理有机废水有着新的指导意义和现实意义，为漂浮陶粒处理废水的后续研究提供了参考。

Abstract: This article investigates the influencing factors and optimal treatment process conditions of photocatalytic treatment of organic wastewater using floating ceramic particles loaded with titanium oxide samples. The results showed that when titanium oxide was calcined at 600˚C, the loading amount of titanium oxide in 100 mL of wastewater was 870 mg/100 g of ceramic particles, pH = 4. After 30 minutes of dark reaction and 1.5 hours of photocatalysis under a 15 W UV lamp, the removal rate of nitrophenol wastewater with a concentration of 15 mg/L reached 74%. On the basis of the optimal treatment process, the reaction kinetics of the secondary loading of recycled ceramic particles were studied. The experimental results showed that titanium dioxide photocatalytic treatment still had a certain degradation effect on nitrophenol. The samples under the optimal processing conditions were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). It was found that the amount of titanium oxide loaded onto porous ceramsite by sol-gel method was increased, and it was not easy to fall off. In the process of organic wastewater treatment, ceramic particles can be recycled and reused, and can achieve a certain degradation rate, which is both environmentally friendly and efficient. It has new guiding and practical significance for the treatment of organic wastewater, and provides reference for the subsequent research of floating ceramic particles in wastewater treatment.