纳米Bi_2WO_6/BiPO_4复合物的制备及其光催化性能研究

Preparation and Photocatalytic Performance of Bi_2WO_6/BiPO_4 Composites

以Bi(NO_3)_3·5H_2O、Na_2WO_6·2H_2O、NaH_2PO_4·2H_2O为原料,通过水热法合成了Bi_2WO_6/BiPO_4复合物;以可见光氙灯为光源、罗丹明B为降解目标物,考察相关因素对其光催化性能的影响,据此优化制备条件;采用SEM、XRD等技术对其晶型结构和形貌进行表征。研究结果表明,前驱体液质量pH=1时,在140℃下反应时间6 h所制备的钨酸铋含量为95%的复合物催化活性最好;对200 mL浓度为50 mg·L-1的罗丹明B而言,复合物用量为0.3 g时催化性能最佳,90min即可令其基本完全降解。

BiEWOt/BiPO4 composites were synthesized by hydro-thermal method from Bi（ NO3 ）3 5H2O and Na2WO6.2H2O and NaH2PO4.2H2O. Crystal structure and morphology were characterized by X-ray diffraction （XRD） and scanning electron microscope （SEM） technologies. In this paper, the best preparation conditions were concluded by exploring photocatalytic performances of Bi2WO6/BiPO4 composites taking rhodamine B as degradation target under irradiation of visible xenon lamp. The experimental results showed that the Bi2WO6/BiPO4 composite processed highest photocatalytic activity with 95% Bi2WO6, under 140℃, with pH value equaling to 1 as well as reaction time lasting for 6 hours. In conclusion, the composites have the best catalytic performances when the dosage of composites was 0.3g, in that degradation rate of 200 mL 50 mg · L-1 rhodamine B was reached to 98.99% in 90 minutes.