Zn_(0.9)Fe_(0.1)S硫化物的制备及其光催化降解双酚A的性能

Preparation and performance of Zn_(0.9)Fe_(0.1)S sulfide for photocatalytic degradation of BPA

以沉淀法制备的Zn0.9Fe0.1S硫化物为光催化剂,双酚A(BPA)为目标污染物,在紫外光下建立UV+硫化物+H2O2光催化体系。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、比表面积测试(BET)对催化剂微观形貌进行分析,并考察了过氧化氢加入量、初始pH、BPA初始浓度、催化剂用量等因素对BPA降解率的影响,研究了该硫化物催化剂的使用寿命。结果表明:当pH=5,过氧化氢的加入量=0.20 mmol·L^(-1),BPA初始浓度为10 mg·L^(-1),催化剂的加入量为0.08 g时,对BPA的去除率最高,达90%以上。催化剂连续使用7次后,对BPA的降解率仍然能达到80%。说明该硫化物催化剂具有较好的稳定性并且与H2O2在光催化作用下具有良好的协同作用,而催化剂的加入也极大地提高了光催化工艺对BPA的处理效果。相比传统光-Fenton体系,UV+硫化物+H2O2光催化体系不仅可以提高BPA的降解率,还降低了H2O2的使用量,降低处理成本。

The sulfide photocatalyst Zn0. 9Fe0. 1S was prepared via the precipitation method. By using bisphenol A（ BPA） as the target contaminant,a photocatalytic system involving ultraviolet（ UV） radiation,sulfide,and H2O2 was established. The effects of amount of hydrogen peroxide,initial pH,initial concentration,and amount of catalyst on the degradation rate of BPA were investigated,and the morphology of the catalyst was examined using scanning electron microscopy（ SEM）,X-ray diffraction（ XRD）,and the specific surface area of the test（ Brunauer-Emmett-Teller） in order to study the utilization life of the photocatalyst. The results showed that when pH was 5,the amount of hydrogen peroxide added was 0. 20 mmol·L^（-1）,initial concentration was 10 mg·L^（-1）,and the amount of catalyst was 0. 08 g,the removal rate of BPA reached up to 90%. After seven consecutive applications,the degradation rate of BPA could still reach 80%,which indicated that the sulfide catalyst has good stability and possesses good synergy with H2O2 during photocatalysis. Moreover,the addition of the catalyst can greatly improve the degradation effect of BPA. Compared to the conventional light-Fenton system,the UV ＋ sulfide ＋ H2O2 photocatalytic system can not only increase the degradation rate of BPA,but also reduce costs and the amount of H2O2.