Photodegradation of malachite green (MG) as the model molecule with TiO2 catalyst by microwave discharge electrodeless lamps (MDELs) was investigated.The effects of different parameters in photodegradation of MG,such as MDEL shape,microwave power,initial solution concentration,and catalyst dosage were discussed.Additionally,the photodegradation of congo red,acid black,acid fuchsine and salicylic acid with anatase TiO2 catalyst were investigated under the optimal reaction condition.The results showed that the MDEL is a new treatment method for enhancing photodegradation of organic contaminants with TiO2 catalyst.
采用溶胶-凝胶技术分别将Keggin型和Dawson型杂多酸负载到TiO2载体上,制备了固体杂多酸催化剂H3PW12O40/TiO2、H4SiW12O40/TiO2和H6P2W18O62/TiO2,通过ICP-AES、31P MAS NMR和N2吸附测定方法对其进行了表征,并对催化剂在合成乙酸乙酯反应中的催化性能进行了对比研究。实验结果表明,负载型杂多酸在反应中的活性高于母体杂多酸的直接催化。其中,H6P2W18O62/TiO2可在120min内使乙酸乙酯收率达到98%。
