摘要
以硝酸银和钨酸钠为原料,采用微波法制备Ag_8W_4O_(16)光催化剂。使用XRD和UV-Vis等手段对样品相组成和UV-Vis吸收特性进行表征;以高压汞灯、氙灯和太阳光为实验光源,罗丹明B为模型污染物,考察Ag_8W_4O_(16)光催化剂的光催化降解活性;探讨催化剂用量、光照时间及光源种类对罗丹明B降解率的影响。XRD结果表明,所得样品为四聚体Ag_8W_4O_(16),属四方晶系,空间群为Pn2n[34],且样品纯度较高。UV-Vis分析表明,样品在(450～600)nm有较强的吸收。光催化降解结果表明,Ag_8W_4O_(16)对罗丹明B具有较好的光催化活性,光催化反应满足一级动力学方程,且光源对活性影响显著。当罗丹明B浓度20 mg·L^(-1)、体积20 mL、催化剂用量20mg和光源为500W高压汞灯时,光催化活性最高。
Using AgNO3 and Na2WO4 as raw materials, Ag8W4O16 photocatalyst was prepared by a microwave-assisted process. The as-prepared sample was characterized by XRD and UV-Vis techniques. The photocatalytic activities of Ag8W4O16 photocatalyst were investigated using rhodamine B as a model pollutant under experimental light sources, such as high press mercury lamp, Xe-lamp and sunlight. The influence of catalyst dosage, irradiation time and light sources on photodegradation of rhodamine B was studied. The XRD result showed that the as-prepared Ag8W4O16 belonged to tetragonal crystal system, Pn2n[34] space group and had higher purity. UV-Vis spectra indicated that the sample had a strong absorption between 450 nm and 600 nm. The photodegradation experiments showed that Ag8W4O16 exhibited the better photocatalytic activity for the photoctegradation of press mercury lamp irradiation. The photocatalytic reaction met the first kinetic equation, and the photocatalyst showed the best activity under the condition of catalyst dosage 20 nag and 500 W high press mercury lamp as light source.
出处
《工业催化》
CAS
2010年第7期61-65,共5页
Industrial Catalysis
基金
国家自然科学基金(20773104)
教育部新世纪优秀人才支持计划(NCET-06-0891)
教育部重点科研基金(208143)
陕西省教育厅专项科研基金(07JK435
09JK817)
陕西省重点实验室重点科研基金(08JZ81)
延安大学科研基金项目(KYQD2008-001)
关键词
催化化学
微波辅助法
Ag8W4O16光催化剂
光催化活性
罗丹明B
catalytic chemistry
microwave-assistant process
silver tungstate photocatalyst
photocatalytic activity
rhodamine B
