改性沸石/TiO_2的制备及光催化降解亚甲基蓝
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摘要
使用碱液侵蚀加煅烧的方法对天然沸石改性,获得改性沸石。以改性沸石为载体,钛酸丁酯为前驱体,使用溶胶-凝胶法制备了改性沸石/TiO_2催化剂。使用亚甲基蓝作为目标污染物,测试改性沸石/TiO_2催化剂的降解性能。结果表明,采用改性沸石负载TiO_2的方法有助于提高光催化剂的利用效率,当TiO_2的负载率为6. 08%时,对亚甲基蓝的降解效率高达0. 935。XRD、SEM-EDS、BET、FTIR测试结果表明,TiO_2以纳米尺度在改性沸石表面均匀分布,并且与改性沸石建立了较强的化学键连接,有利于改性沸石/TiO_2催化剂的长期性能。
The natural zeolite was modified by alkali corrosion and calcination to obtain modified zeolite.Based on the obtained modified zeolite,the modified-zeolite/TiO_2 catalyst( MZTC) was fabricated by using sol-gel method. Methylene blue was used as the target pollutant to test the photocatalytic degradation performance of MZTC. The results show that it was more efficient to utilize the TiO_2 by loading TiO_2 on modified zeolite. When the content of TiO_2 was 6. 08%,the degradation efficiency of MZTC towards methylene blue was the highest,reaching 0. 935. The results of XRD,SEM-EDS,BET and FTIR show that TiO_2 was homogeneously distributed on the surface of the modified zeolite at the nanoscale,and a strong chemical bond was established between TiO_2 and the modified zeolite,which was conducive to the long-term performance of MZTC.
The natural zeolite was modified by alkali corrosion and calcination to obtain modified zeolite.Based on the obtained modified zeolite,the modified-zeolite/TiO_2 catalyst( MZTC) was fabricated by using sol-gel method. Methylene blue was used as the target pollutant to test the photocatalytic degradation performance of MZTC. The results show that it was more efficient to utilize the TiO_2 by loading TiO_2 on modified zeolite. When the content of TiO_2 was 6. 08%,the degradation efficiency of MZTC towards methylene blue was the highest,reaching 0. 935. The results of XRD,SEM-EDS,BET and FTIR show that TiO_2 was homogeneously distributed on the surface of the modified zeolite at the nanoscale,and a strong chemical bond was established between TiO_2 and the modified zeolite,which was conducive to the long-term performance of MZTC.
引文
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[2]蔺宇.浅谈我国水污染的现状及危害[J].低碳世界,2018(10):9-10.
[3]Fujishima A,Honda K.Electrochemical Photolysis of Water at a Semiconductor Electrode[J].Nature,1972,238(5358):37-38.
[4]Carey J H,Lawrence J,Tosine H M.Photodechlorination of PCB's in the Presence of Titanium Dioxide in Aqueous Suspensions[J].Bulletin of Environmental Contamination&Toxicology,1976,16(6):697-701.
[5]Legrini O,Oliveros E,Braun A M.Photochemical Processes for Water Treatment[J].Chemical Reviews,1993,93(2):671-698.
[6]Yibing Z,Jian W.Preparation of Ti O2Nano-materials and Photocatalytic Purification of Sewage[J].Journal of Environment&Health,2009:655-657.
[7]钟俊波,沈昱,徐锁洪.硅胶负载Ti O2光催化降解吡啶[J].重庆环境科学,2003,25(12):20-21.
[8]胡春,王怡中.凹凸棒负载Ti O2对偶氮染料和纺织废水光催化脱污[J].环境科学学报,2001,21(1):123-125.
[9]何秀兰,郭英奎,王春艳,等.多孔陶瓷负载Ti O2光催化降解甲基橙溶液的研究[J].人工晶体学报,2015,44(2):504-508.
[10]Ooka C,Yoshidab H,Suzukic K,et al.Highly Hydrophobic Ti O2Pillared Clay for Photocatalytic Degradation of Organic Compounds in Water[J].Microporous&Mesoporous Materials,2004,67(2):143-150.
[11]赵妍,梁秀红.Ti O2/微孔陶瓷的制备及光催化降解亚甲基蓝[J].河北工业大学学报,2017,46(4):46-52.
[12]Corma A,Garcia H.Zeolite-based Photocatalysts[J].Chemical Communications,2004,35(13):1443-1459.
[13]蒋引姗,金为群,张军,等.Ti O2/沸石复合物结构和光催化性能[J].无机材料学报,2002,17(6):1301-1305.
[14]方送生,蒋引珊,宋波.天然沸石的热活化对负载Ti O2的结构与性能的影响[J].功能材料,2004,1:122-124
[15]Jansson I,Suárez S,Garcia-Garcia F J.et al.Zeolite-TiO2Hybrid Composites for Pollutant Degradation in Gas Phase[J].Applied Catalysis B:Environmental,2015,178:100-107.
[16]Sugra1ez R,Alvarez J I,Cruz-Yusta M,et al.Enhanced Photocatalytic Degradation of NOxGases by Regulating the Microstructure of Mortar Cement Modified with Titanium Dioxide[J].Building&Environment,2013,69(11):55-63.
[17]Zhang Y J,Liu L C,Ni L L,et al.A Facile and Low-cost Synthesis of Granulated Blast Furnace Slag-based Cementitious Material Coupled with Fe2O3Catalyst for Treatment of Dye Wastewater[J].Applied Catalysis B Environmental,2013,138-139(28):9-16.
[18]Mozgawa W.The Influence of Some Heavy Metals Cations on the FTIR Spectra of Zeolites[J].Journal of Molecular Structure,2000,555(1):299-304.
[19]Christidis G E,Moraetis D,Keheyan E,et al.Chemical and Thermal Modification of Natural HEU-type Zeolitic Materials from Armenia,Georgia and Greece[J].Applied Clay Science,2003,24(1):79-91.
[20]De Man A J M,Sauer J.Coordination,Structure,and Vibrational Spectra of Titanium in Silicates and Zeolites in Comparison with Related Molecules.An ab Initio Study[J].The Journal of Physical Chemistry,1996,100(12):5025-5034.