纳米光催化剂TiO_2的结构表征及光催化杀菌性能
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摘要
采用溶胶-凝胶法,以钛酸丁酯为前驱物制备了纳米半导体光催化剂TiO_2。通过比表面分析(BET)、X射线衍射(XRD)和X光电子能谱(XPS)对光催化剂进行了结构表征,并采用平板菌落计数法考察了纳米TiO_2对大肠杆菌及金黄色葡萄球菌的光催化杀菌性能。结果表明:所制备的TiO_2光催化剂纯度较高,比表面积为76.5 m~2/g,粒径为16.9 nm,具有TiOx、-OH、COO-特征峰及以锐钛矿相为主的锐钛矿与金红石混晶结构,有利于光催化性能的提高。在主波长为254 nm紫外光照射下,对大肠杆菌及金黄色葡萄球菌的杀菌效果较好,作用30 min后去除率可以分别达到97.8%及99.4%,说明纳米光催化剂TiO_2是具有较好杀菌性能的环保功能材料。
Nano semiconductor photocatalyst TiO_2 was prepared by a sol-gel method with butyl phthalate as the precursor. The structures of the TiO_2 photocatalyst were characterized by Brunaure-Emmett-Teller( BET),X-ray Diffraction( XRD) and X-ray Photoelectron Spectroscopy( XPS). And the photocatalytic antibacterial performance on Escherichia coli and Staphylococcus aureus were investigated using the flat colony counting method. The results showed that the TiO_2 photocatalyst had a higher purity,larger specific surface area was 76.5 m~2/g,and smaller particle size was 16.9 nm with the characteristic peaks of TiOx,-OH and COO-.Besides,there was a rutile and anatase mixed crystal structure with anatase structure as the dominant phase,which was in favor of improving photocatalytic properties of TiO_2.Under the irradiation UV light at the wavelength of 254 nm for30 min,the removal efficiency of Escherichia coli and Staphylococcus aureus on TiO_2 was up to 97.8% and 99.4%,respectively.And it showed that TiO_2 was an environmentally friendly functional material with good bactericidal performance.
Nano semiconductor photocatalyst TiO_2 was prepared by a sol-gel method with butyl phthalate as the precursor. The structures of the TiO_2 photocatalyst were characterized by Brunaure-Emmett-Teller( BET),X-ray Diffraction( XRD) and X-ray Photoelectron Spectroscopy( XPS). And the photocatalytic antibacterial performance on Escherichia coli and Staphylococcus aureus were investigated using the flat colony counting method. The results showed that the TiO_2 photocatalyst had a higher purity,larger specific surface area was 76.5 m~2/g,and smaller particle size was 16.9 nm with the characteristic peaks of TiOx,-OH and COO-.Besides,there was a rutile and anatase mixed crystal structure with anatase structure as the dominant phase,which was in favor of improving photocatalytic properties of TiO_2.Under the irradiation UV light at the wavelength of 254 nm for30 min,the removal efficiency of Escherichia coli and Staphylococcus aureus on TiO_2 was up to 97.8% and 99.4%,respectively.And it showed that TiO_2 was an environmentally friendly functional material with good bactericidal performance.
引文
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[3]黄安娜,苏海佳.可见光活性纳米Ti O2光催化涂料的抗菌性能研究[J].环境工程学报,2011,5(2):477-480.
[4]金宗哲.无机抗菌材料及应用[M].北京:化学工业出版社,2004.
[5]张慧书,刘守新.TiO2光催化杀菌机理及应用研究进展[J].科学技术与工程,2009,9(17):5049-5056,5064.
[6]刘文碧,刘迎云,廖颉.中央空调系统中微生物控制技术简介[J].广州环境科学,2008,23(1):24-28.
[7]Tadashim M,Ryozo T,Toshiaki,et al.Photoelectrochemical sterilization of microbial cells by semiconductor powders[J].FEMS Microbiology Letters,1985,29:211-214.
[8]Jing Y Y,Feng J,Li W Y,et al.Low-temperature synthesis of water-dispersible anatase titanium dioxide nanoparticles for photocatalysis[J].Journal of Colloid and Interface Science,2013,396:90-94.
[9]江海风,杨建忠.含纳米Ti O2毛织物的抗菌性能研究[J].毛纺科技,2008(1):4-7.
[10]Huang Z,Maness P C,Make D M,et al.Bactericidal mode of titanium dioxide photocatalysis[J].Journal of photochemistry and photobiology,2000,130(1):163-170.
[11]Sunada K,Watanabe T,Hashimoto K.Studies on photokilling of bacteria on Ti O2thin film[J].Journal of Photochemistry and Photobiology A:Chemistry,2003,156(2):227-233.
[12]曾炽涛,陈爱平,陈爱华,等.负载型Ti O2/玻璃弹簧的光催化杀菌作用[J].催化学报,2003,24(7):520-524.
[13]田莉瑛,钟金梅,张雪梅,等.标准型纳米Ti O2(P-25)光催化杀菌性能[J].河北师范大学学报:自然科学版,2009,33(4):525-530.
[14]李君建,李巧玲.载银Ti O2/碳纳米管复合材料的制备及其催化杀菌性能[J].化工进展,2015,34(7):1887-1893,1955.
[15]黄利强,许昱,郭松林.纳米Ti O2光催化杀灭水产病原菌的研究[J].集美大学学报:自然科学版,2010,15(4):254-257.
[16]赵金辉,陈卫.饮用水Ti O2光催化消毒机理及应用研究进展[J].青岛理工大学学报,2008,29(1):79-83.
[17]杨岳,黄碧纯,叶代启.CdS-Ti O2/MWCNTs光催化剂的制备、结构表征及性能[J].工业催化,2009,17(8):28-33.
[18]沈萍,范秀荣,李广武.微生物学实验(第3版)[M].北京:化学工业出版社,1996.
[19]温惠敏,衣守志,裴丽丽,等.TiO2、Bi VO4、Cu2O光催化降解低浓度甲醛[J].环境工程学报,2017,11(5):2940-2945.
[20]Wu D Y,Long M C,Cai W M,et al.Low temperature hydrothermal synthesis of N-doped Ti O2photocatalyst with high visible-light activity[J].Journal of Alloys and Compounds,2010,502(2):289-294.
[21]Zhang X W,Zhou M H,Lei L C.Co-deposition of photocatalytic Fe doped Ti O2coating by MOCVD[J].Catalysis Communications,2006,7(7):427-431.
[22]江滨,张广心,郑水林,等.煅烧温度对Ti O2/硅藻土晶型结构与光催化性能的影响[J].无机材料学报,2014,29(4):382-386.
[23]杜娴,杜慧玲.TiO2的混晶效应与光催化性能综合实验研究[J].实验技术与管理,2016,33(1):58-66.
[24]张建灵.CdS/Ti O2纳米管光电催化产氢研究[D].杭州:浙江大学,2008.
[25]马丽萍,赵杉林,李萍,等.纳米Ti O2及其复合材料的抗菌性能研究[J].当代化工,2014,43(9):1863-1867.