磁性沸石/壳聚糖微球非均相光催化降解苯酚

Study on the heterogeneous photocatalytic degradation of phenol with magnetic zeolite / chitosan microspheres

研究新型催化材料是降低苯酚废水对环境污染,减少沸石、壳聚糖等传统吸附材料在苯酚处理中的投加量,降低实验成本的首要任务。文章以沸石/壳聚糖复合微球为载体,通过离子交换法和液相沉积法负载上Fe_3O_4的方式制备新型复合光催化剂,并用于催化非均相UV/Fenton法去除废水中的苯酚,阐明了复合催化剂投加量、不同苯酚溶液浓度、pH值、反应时间、H_2O_2投加量、温度、光照强度、不同材料催化UV/Fenton等因素对磁性复合材料催化性能的影响。结果表明:在模拟苯酚废水浓度为20 mg/L,pH=6时投加0.5 g复合催化剂和0.3 mLH_2O_2,在24 W紫外灯照射下反应70 min,苯酚的去除率可达到91.46%;在同等条件下MZC催化非均相UV/Fenton反应处理苯酚的光催化能力最强;磁性沸石壳聚糖作为光催化剂有较好的光催化效果,苯酚去除率高。

The study of new catalytic materials is the most important task to reduce the environmental pollution of phenol wastewater, reduce the dosage of traditional adsorption materials such as zeolite and chitosan in the treatment of phenol, and reduce the experimental cost. The zeolite-chitosan composite beads as the carrier, through the ion exchange method and liquid phase deposition method make Fe3O4 load on it, which is a photocatalyst for removing water phenol by UV/Fenton test. The experiment investigates the effects of composite catalyst＇ s dosage, different phenol concentration, pH value, reaction time, H2O2 quantity, temperature, light strength, different materials catalyze UV/ Fenton etc. The experiments show that in concentration phenol wastewater is 20mg/L, pH = 6investment plus 0. 5g composite catalyst, 0. 3ml H2O2, reaction 70min during 24W UV light irradiation, the phenol re-moval rate can reach 91.46%. Under the same conditions, MZC catalyzed the heterogeneous UV/Fenton reaction to treat phenol with the strongest photocatalytic ability. Magnetic zeolite chitosan as photocatalyst has better photocatalytic effect and high phenol removal rate.