摘要
采用溶胶-凝胶法和原位氧化聚合法制备了新型聚苯胺修饰纳米TiO_2(PANI-TiO_2)复合光催化剂。以甲基橙溶液模拟有机染料废水,考察了过硫酸钾加入量、苯胺加入量、盐酸浓度及反应温度对PANI-TiO_2复合光催化剂降解甲基橙性能的影响。采用XRD,UV-vis,FTIR技术对PANI-TiO_2复合光催化剂进行了表征。实验结果表明:PANI-TiO_2复合光催化剂降解甲基橙的最适宜工艺条件为:n(过硫酸钾):n(钛酸四丁酯)=0.1,n(苯胺):n(钛酸四丁酯)=0.11,盐酸浓度2 mol/L,反应温度20℃,在此最适宜条件下,反应时间为60 min时,甲基橙降解率为97%。表征结果显示:与TiO_2相比,PANI-TiO_2复合光催化剂明显发生了红移现象,带隙变窄,有利于光催化反应效率的提高;与PANI相比,PANI-TiO_2复合光催化剂的红外特征峰向低波数的方向发生偏移;PANI-TiO_2复合光催化剂为锐钛矿型。
The new type of polyaniline modified nano TiO2 （PANI-TiO2）composite photocatalyst was prepared by sol-gel method and in-situ oxidation polymerization method. Using methyl orange solution as simulated organic dye wastewater, the effects of potassium persulfate dosage, aniline dosage, hydrochloric acid concentration and reaction temperature on degradation of methyl orange were studied. And the PANI-TiO2 composite photocatalyst was characterized by XRD, UV- vis and FTIR. The optimum process conditions for degradation of methyl orange on PANI-TiO2 composite photocatalyst are as follows： n （potassium persulfate） ： n （tetrabutyl titanate） =0.1, n （aniline） ： n （tetrabutyl titanate） =0.11, hydrochloric acid concentration 2 mol/L and reaction temperature 20 ℃. The degradation rate of methyl orange is 97% after reaction for 60 min under these optimum conditions. The characterization results show that： Compared with TiO2, PANI-TiO2 composite photocatalyst has an obvious red-shift and narrowed band gaps in UV-vis absorption speclrum, which are in favor of the improvement of photocatalytic reaction eificiency; Compared with PANI, the infiared characteristic peaks of PANI-TiO2 composite photocatalyst shifted toward the lower wave number direction; The PANI-TiO2 composite photocatalyst is anatase type.
出处
《化工环保》
CAS
CSCD
北大核心
2016年第1期26-29,共4页
Environmental Protection of Chemical Industry
基金
国家自然科学基金项目(51202294)
中央高校基本科研业务专项资金资助项目(R1404006A)
