Na_2CO_3修饰TiO_2纳米材料的制备与染料废水处理研究
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摘要
以钛酸四正丁酯为钛源,采用水热法制备了纯TiO_2和用碳酸钠修饰的TiO_2纳米粉体,采用XRD、N2吸附-脱附、SEM和TEM等对其结构和形貌进行了表征。研究材料对亚甲基蓝溶液模拟染料废水的光催化性能。结果表明,碳酸钠修饰后的TiO_2具有介孔结构,与纯TiO_2相比,晶粒尺寸减小,比表面积增大,对亚甲基蓝表现出较好的光催化去除性能,光反应30 min时,对亚甲基蓝的脱色率达97.05%。
Pure titanium dioxide and TiO_2 nanomaterials modified by Na_2CO_3 were synthesized by hydrothermal method,using Ti(OC_4H_9)_4 as titanium source.X-ray diffraction(XRD),electron microscopy(SEM) and N2 adsorption-desorption tests were used for investigation of photocatalytic nanomaterials' microstructure and micromorphology.The photocatalytic experiments were performed by photodegradation of methylene blue to check their photocatalytic properties.The results showed that composite modified by sodium carbonate has better photocatalytic removal performance to methylene blue than pure titanium dioxide,which exhibited mesoporous structure,smaller grain size and larger specific surface area.The decolorization rate of methylene blue reached 97.05% under U-V light irradiation for 30 min.
Pure titanium dioxide and TiO_2 nanomaterials modified by Na_2CO_3 were synthesized by hydrothermal method,using Ti(OC_4H_9)_4 as titanium source.X-ray diffraction(XRD),electron microscopy(SEM) and N2 adsorption-desorption tests were used for investigation of photocatalytic nanomaterials' microstructure and micromorphology.The photocatalytic experiments were performed by photodegradation of methylene blue to check their photocatalytic properties.The results showed that composite modified by sodium carbonate has better photocatalytic removal performance to methylene blue than pure titanium dioxide,which exhibited mesoporous structure,smaller grain size and larger specific surface area.The decolorization rate of methylene blue reached 97.05% under U-V light irradiation for 30 min.
引文
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[3]中华人民共和国环境保护部.环境统计年报[R].北京:中华人民共和国环境保护部,2015.
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[5]孔德生,王静,张学迪,等.Na2CO3对Ti O2纳米管电极表面光电化学水分解反应的催化作用研究[J].电化学,2013,19(1):71-78.
[6]王静静.金属离子改性二氧化钛光催化性质的研究[D].杭州:浙江大学,2011.
[7]刘瑶,杜平,王玉萍.染料化合物在改性介孔Ti O2上的吸附[J].环境化学,2014(6):976-984.
[8]Lazar M A,Daoud W A.Selective adsorption and photocatalysis of low-temperature base-modified anatase nanocrystals[J].Rsc Advances,2011,2(2):447-452.
[9]吴新民,孙颖婷,田培蓉.废水中离子对改性Ti O2催化剂降解盐酸四环素的影响[J].应用化工,2016,45(3):450-452.
[10]Tachikawa T,Tojo S,Mamoru Fujitsuka A,et al.Influence of metal ions on the charge recombination processes during Ti O2photocatalytic one-electron oxidation reactions[J].J Phys Chem B,2004,108(30):11054-11061.
[11]崔玉民.影响纳米材料Ti O2光催化活性的因素[J].稀有金属,2006,30(1):107-113.
[12]Robert D.Colloid and Interface Chemistry[M].Wuhan:Addison-Wesley Pub.Co.Inc,1983.
[13]Sing K S W.Reporting physisorption data for gas/solid systems-with special reference to the determination of surface area and porosity[J].Pure&Applied Chemistry,1985,57(4):603-619.
[14]孙奉玉,吴鸣,李文钊,等.二氧化钛的尺寸与光催化活性的关系[J].催化学报,1998,19(3):229-233.