PPy-TiO_2/CSC的制备及太阳光催化处理没食子酸生产废水研究  

Preparation of PPy-TiO_2/CSC and Its Solar Photocatalytic Degradation of Gallic acid Wastewater

作　　者：田奋扬 王海俨 黄滔 刘佳伟 付子婧 罗洁[1] TIAN Fenyang;WANG Haiyan;HUANG Tao;LIU Jiawei;FU Zijing;LUO Jie(School of Materials and Engineering, Central South University of Forestry and Technology, Changsha 410004, China)

机构地区：[1]中南林业科技大学材料科学与工程学院,湖南长沙410004

出　　处：《水处理技术》2018年第5期48-52,共5页Technology of Water Treatment

基　　金：国家自然科学基金资助项目(20976201);湖南省2011协同创新中心项目;湖南省教育厅科学研究项目(09C1014);中南林业科技大学研究生科技创新基金资助项目(CX2016B06);中南林业科技大学大学生研究性学习和创新性实验计划项目

摘　　要：以工业级纳米Ti O_2为原料,吡咯作为聚合物单体,采用化学氧化法和原位聚合法制备了聚吡咯(PPy)改性催化剂。以椰壳活性炭(CSC)作为载体,制得PPy-Ti O_2/CSC,对其进行了表征。在模拟太阳光照下,对没食子酸生产废水的处理进行了研究,考察了双氧水加入量、p H、光照时间和催化剂用量对COD的影响,进行了L_9(3~4)正交实验。结果表明,PPy-Ti O_2在可见光区的吸收比纳米Ti O_2强,发生红移;改性后Ti O_2晶型未改变。优化工艺条件为:在500W氙灯光照下,催化剂加入量为5 g/L,6 m L/L的质量分数3%的H_2O_2,p H=7,光照2.5 h。最终没食子酸生产废水光催化降解率可达88.52%,且在重复使用过程中能保持较好的光催化活性。Polypyrrole modified TiO2（PPy-TiO2）was prepared by chemical oxidation and in situ polymerization method,and industrial grade nano TiO2and pyrrole monomer were used as raw material.The composite photocatalyst of PPy-TiO2/CSC was prepared by using coconut shell activated carbon（CSC）as carrier.The samples were characterized.The treatment of gallic acid production wastewater was studied under simulated solar irradiation,and the effect of hydrogen peroxide addition,pH,irradiation time and catalyst dosage on COD removal was investigated,and L9（3^4）orthogonal experiments were carried out.The results showed that,The results showed that the absorption of PPy-TiO2in the visible light region was stronger than that of the nanosized TiO2,and the red shift occurred in the TiO2.The crystal morphology of the modified TiO2 nanoparticles was not changed.The optimum conditions were as follows,with 500 W xenon lamp irradiation,the addition of photocatalyst was 5 g/L,H2O2was 6 mL/L with 3%mass concentration,pH was 7 and irradiation time was 2.5 h.Under above conditions,the photocatalytic degradation rate was up to 88.52%for gallic acid wastewater,and could maintain better photocatalytic activity in the reuse process.

关 键 词：PPy-TiO2/CSC催化剂 聚吡咯(PPy) TIO2 椰壳活性炭(CSC) 太阳光 没食子酸生产废水 

分 类 号：TQ426.91[化学工程]