锰改性二氧化钛石墨烯快速降解甲基紫

Degradation of Methyl Violet by Manganese-modified Titanium Dioxide

以四氯化钛为原料,浓硫酸作催化剂,通过水解法,得草酸锰的锰改性锐钛型二氧化钛,以氧化石墨烯为催化剂载体,通过自组装,获得锰改性二氧化钛石墨烯水凝胶,自然光作用下,系统研究复合水凝胶对甲基紫得降解性能。采用XRD、SEM、EDX、Rammman及DRS对材料的结构和特性进行了测试,结果表明:材料晶体为锐钛型、石墨烯为还原石墨烯、Ti与Mn原子数量比18。复合材料的Eg1.07 eV:小于二氧化钛的Eg2.07 eV。在模拟太阳光作用下,固体与液体比例为1∶2,在9 h内,复合水凝胶对50 mg/L的甲基紫催化降解率超过90%。添加草酸铵、叔丁醇、苯醌抑制剂,分别研究空穴、羟基自由基、超氧自由基作用原理,结果表明复合水凝胶在可见光下催化降解甲基紫主要来源于羟基自由基与超氧自由基。

Ttanium tetrachloride used as raw materials,concentrated sulfuric acid usedas catalyst,through hydrolysis method,improved anatase titanium modified with manganese was successfully prepared by self-assembly,meantimes graphene oxide was utilized as the catalyst support through,modified titanium dioxide to manganese graphene hydrogels,methyl violet as degradable material,the performance of hydrogel.on the degradation of methyl voiolet with the visible light were systematically investigated and studied.XRD,SEM,EDX,Rammman and DRS were usedto test and prove the structure of the material,and the results indicated that the crystal form of this substance belongs to anatase,the graphene belongs to reductive graphene,the ratio of Ti and Mn atoms was about 18;energy gap of Mn-anatase TiO2 reduced graphene oxide wa sequivalent to 1.07 ev,which was less than 2.07 ev attributing to Eg of pure titanium dioxide.simulation sunlight,the ratio of solid to liquid was selected 1∶2,and the catalytic degradation ratio of 50 mg/L methyl violet was over 90%within 9hrs.Ammonium oxalate,tert-butanol and benzoquinone inhibitors were used to valuated the mail role on hole,hydroxyl radicaland superoxide radical,respectively.The results showed that the catalytic degradation of methyl violet by under visible light mainly affected by the hydroxyl radical and superoxide radical during the whole photocatalytic reaction.