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以Bi(NO3)3.5H2O、Na2WO4.2H2O为原料,NaOH为矿化剂,采用水热法合成Bi2WO6纳米晶体,并使用XRD、SEM、TEM、DRS和低温氮吸附等手段对样品进行表征,考察了其可见光降解RhB的催化性能,分析了不同酸性助剂CH3COOH和HNO3对水热法合成Bi2WO6光催化剂的影响。实验结果表明,不同酸性助剂对Bi2WO6样品的形貌和可见光催化活性均有较大影响。HNO3的添加抑制了花状微球的形成,使Bi2WO6样品的紫外-可见光吸收边发生红移,比表面积增大。光催化测试结果表明,以HNO3为酸性助剂时所制备样品的光催化活性最高,添加CH3COOH则相对降低。
The Bi2WO6 nanocrystals were synthesized by hydrothermal method using Bi (NO3) 3.5H2O and Na2WO4.2H2O as raw materials and NaOH as mineralizer. The samples were characterized by XRD, SEM, TEM, DRS and low temperature nitrogen adsorption. The photocatalytic performance of RhB catalyzed by visible light was studied. The effects of CH3COOH and HNO3 with different acid auxiliaries on Bi2WO6 photocatalyst were investigated. The experimental results show that different acidic additives have a great influence on the morphology and visible light catalytic activity of Bi2WO6 samples. The addition of HNO3 inhibited the formation of flower-like microspheres, red-shifted the UV-visible absorption edge of Bi2WO6 sample, and increased the specific surface area. The results of photocatalytic test showed that the photocatalytic activity of the sample prepared with HNO3 as the acidic assistant was the highest, while the addition of CH3COOH was relatively lower.