Ag、N共掺杂TiO_2漂浮型催化剂的光催化性能
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摘要
采用溶胶-凝胶法,制备出银氮共掺杂TiO_2负载膨胀珍珠岩的催化剂,通过电子显微镜扫描(SEM)、比表面积及孔径分析(BET)和X射线衍射(XRD)对其结构进行表征,并以罗丹明B溶液为目标降解物,研究所制备催化剂的光催化性能。结果表明:复合材料成功负载了Ag和N元素,且掺杂增强了TiO_2对可见光的响应能力;复合材料存在少量的微孔和大孔,同时存在大量的介孔;掺杂氮后材料的光催化活性大幅度提高,继续掺杂Ag后光催化活性进一步提高,当n(Ag)∶n(Ti)=0. 50%时光催化性能最佳,4 h内处理罗丹明B降解率可达99. 3%,材料的光催化反应符合一级反应动力学方程,表明其在环境净化实际应用中的巨大潜力。
In this paper,a photocatalyst was prepared,co-doped with Ag,N and TiO_2,loaded on expanded perlite by sol-gel method. The as-synthesized materials were characterized by scanning electron microscopy( SEM),Brunauer-Emmett-Teller( BET) and X-ray diffraction( XRD) for their structures. The photocatalytic properties of the as-synthesized materials were studied with Rh B as the target degrading substance. The results confirmed that both Ag and N were present in the nanocomposites. The batch catalytic experiment revealed that Ag and N increased the photolytic capacity of TiO_2 under visible light exposure. There were a small number of micropores and macropores in the composites,and a large amount of mesoporous materials. After doping nitrogen,the photocatalytic activity of the materials increased greatly,and the photocatalytic activity increased further with the doping of silver. The optimized catalytic performance was achieved with the mole ratio of silver to titanium at 0. 50%,then the degradation rate of Rhb could reach 99. 3% after 4 hours reaction. The Rh B degradation course followed the first order kinetic model. The test result revealed its great potential for environmental purification in practical application.
In this paper,a photocatalyst was prepared,co-doped with Ag,N and TiO_2,loaded on expanded perlite by sol-gel method. The as-synthesized materials were characterized by scanning electron microscopy( SEM),Brunauer-Emmett-Teller( BET) and X-ray diffraction( XRD) for their structures. The photocatalytic properties of the as-synthesized materials were studied with Rh B as the target degrading substance. The results confirmed that both Ag and N were present in the nanocomposites. The batch catalytic experiment revealed that Ag and N increased the photolytic capacity of TiO_2 under visible light exposure. There were a small number of micropores and macropores in the composites,and a large amount of mesoporous materials. After doping nitrogen,the photocatalytic activity of the materials increased greatly,and the photocatalytic activity increased further with the doping of silver. The optimized catalytic performance was achieved with the mole ratio of silver to titanium at 0. 50%,then the degradation rate of Rhb could reach 99. 3% after 4 hours reaction. The Rh B degradation course followed the first order kinetic model. The test result revealed its great potential for environmental purification in practical application.
引文
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[16]张守花,张新海.铜掺杂改性Ti O2光催化降解三氟羧草醚废水研究[J].广州化工,2017,45(23):90-92.
[17]刘辉,刘婷婷,董晓楠.贵金属银选择性修饰高能晶面暴露二氧化钛光催化剂的制备及性能[J].陕西科技大学学报(自然科学版),2016(1):40-45.
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[19]黄瑞宇,罗序燕,赵东方,等.银掺杂二氧化钛及其光催化性能研究[J].有色金属科学与工程,2016,7(2):67-72.
[20]吴静,钱晓荣,郁桂云.改性掺银二氧化钛对甲基橙的光催化降解研究[J].应用化工,2012,41(11):2042-2043,2048.
[21]王冀霞.石墨烯和银掺杂二氧化钛复合膜的光催化性能研究[D].秦皇岛:燕山大学,2016.
[22]罗力莎,邹东雷,陈宇溪,等.负载型银掺杂二氧化钛光催化降解盐酸四环素特性研究[J].环境与健康杂志,2017,34(9):820-824.
[23]国伟林,杜红,王西奎,掺银二氧化钛的超声化学法制备与光催化性能研究[J].济南大学学报(自然科学版),2004,18(4):301-303.
[24]Zhao J Q,Wan P,Xiang J,et al.Synthesis of highly ordered macro-mesoporous anatase Ti O2film with high photocatalytic activity[J].Microporous and Mesoporous Materials,2011,138(1/2/3):200-206.
[25]王珊珊,彭淑静,郑阳阳,等.负载型纳米Ti O2光催化降解甲基橙[J].天津化工,2017,31(5):14-15,25.
[26]张冰.等离子体辐照提高纳米银/二氧化钛复合薄膜光催化性能研究[J].合肥:合肥工业大学,2017.
[2]胡谦.固相微萃取模拟生物法用于监测养殖区疏水性有机污染物的研究[D].上海:上海海洋大学,2016.
[3]王磊,刘辰雨,王振卫,等.二氧化钛-硫化镉/还原氧化石墨烯复合材料光催化降解废水中有机物的研究[J].上海应用技术学院学报(自然科学版),2017,17(2):165-170.
[4]王熙,董海太,齐中,等.复合光催化膜Mo S2/Ag/Ti O2同步降解有机物及产氢的研究[J].华南师范大学学报(自然科学版),2017,49(4):51-56.
[5]王恩霞.碳纳米管负载二氧化钛的制备及对有机物光催化性能的研究[D].天津:天津工业大学,2017.
[6]冷彩凤.刘思思,刘保健.SiO2气凝胶/纳米Ti O2共混光催化剂降解甲基橙[J].包装工程,2017,38(19):41-46.
[7]杨在志,傅小明,李向成.S掺杂纳米二氧化钛化学降解工业有机污染物的研究[J].广东化工,2017,44(18):29-30.
[8]彭绍琴,江风益,李越湘.N掺杂Ti O2光催化剂的制备及其可见光降解甲醛[J].功能材料,2005,36(8):1207-1209.
[9]王喜全,范诗迎,王义男.Cu掺杂纳米Ti O2负载型催化剂降解活性艳蓝X-BR的动力学研究[C]∥中国环境科学学会2013年学术年会论文集,2013.
[10]方林霞,张晓燕.膨胀珍珠岩负载Fe、Tb共掺杂Ti O2光催化剂的制备及光催化性能研究[J].化工新型材料,2015,43(8):128-130.
[11]马荣荣,王学江,王伟,等.漂浮型可见光复合光催化剂B-N-Ti O2/EP的制备、表征及其光催化性能[J].环境工程学报,2017,11(1):71-77.
[12]卢芳慧,桂经亚,宋兵,等.纳米-Ti O2/膨胀珍珠岩复合光催化材料的制备与表征[J].硅酸盐通报,2013,32(4):754-757.
[13]雍卫卫,王小治,高芡芡,等.纳米Ti O2/EP光催化降解罗丹明B废水的研究[J].环境工程学报,2012,6(1):185-190.
[14]徐锁洪,钟俊波,白春学.膨胀珍珠岩负载Ti O2光催化脱色性能的研究[J].环境工程学报,2003,4(10):40-42.
[15]刘爽.贵金属修饰Ti O2纳米晶组装多孔光催化剂的制备及性能研究[D].西安:陕西科技大学,2017.
[16]张守花,张新海.铜掺杂改性Ti O2光催化降解三氟羧草醚废水研究[J].广州化工,2017,45(23):90-92.
[17]刘辉,刘婷婷,董晓楠.贵金属银选择性修饰高能晶面暴露二氧化钛光催化剂的制备及性能[J].陕西科技大学学报(自然科学版),2016(1):40-45.
[18]冯骞,施明杰,操家顺.钒酸银改性二氧化钛制备及其可见光光催化性能研究[J].中国环境科学,2015,35(11):3317-3324.
[19]黄瑞宇,罗序燕,赵东方,等.银掺杂二氧化钛及其光催化性能研究[J].有色金属科学与工程,2016,7(2):67-72.
[20]吴静,钱晓荣,郁桂云.改性掺银二氧化钛对甲基橙的光催化降解研究[J].应用化工,2012,41(11):2042-2043,2048.
[21]王冀霞.石墨烯和银掺杂二氧化钛复合膜的光催化性能研究[D].秦皇岛:燕山大学,2016.
[22]罗力莎,邹东雷,陈宇溪,等.负载型银掺杂二氧化钛光催化降解盐酸四环素特性研究[J].环境与健康杂志,2017,34(9):820-824.
[23]国伟林,杜红,王西奎,掺银二氧化钛的超声化学法制备与光催化性能研究[J].济南大学学报(自然科学版),2004,18(4):301-303.
[24]Zhao J Q,Wan P,Xiang J,et al.Synthesis of highly ordered macro-mesoporous anatase Ti O2film with high photocatalytic activity[J].Microporous and Mesoporous Materials,2011,138(1/2/3):200-206.
[25]王珊珊,彭淑静,郑阳阳,等.负载型纳米Ti O2光催化降解甲基橙[J].天津化工,2017,31(5):14-15,25.
[26]张冰.等离子体辐照提高纳米银/二氧化钛复合薄膜光催化性能研究[J].合肥:合肥工业大学,2017.
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