王勇, 卢荣, 张福滨. 低温合成Ag/TiO2纳米复合材料及光催化性能的研究[J]. 南昌航空大学学报(自然科学版), 2014, 28(3): 57-63. DOI: 10.3969/j.issn.1001-4926.2014.03.010
引用本文: 王勇, 卢荣, 张福滨. 低温合成Ag/TiO2纳米复合材料及光催化性能的研究[J]. 南昌航空大学学报(自然科学版), 2014, 28(3): 57-63. DOI: 10.3969/j.issn.1001-4926.2014.03.010
WANG Yong, LU Rong, ZHANG Fu-bin. Low-temperature Synthesis of Metallic Silver Particles Doped TiO2 and its Photocatalytic Activity[J]. Journal of nanchang hangkong university(Natural science edition), 2014, 28(3): 57-63. DOI: 10.3969/j.issn.1001-4926.2014.03.010
Citation: WANG Yong, LU Rong, ZHANG Fu-bin. Low-temperature Synthesis of Metallic Silver Particles Doped TiO2 and its Photocatalytic Activity[J]. Journal of nanchang hangkong university(Natural science edition), 2014, 28(3): 57-63. DOI: 10.3969/j.issn.1001-4926.2014.03.010

低温合成Ag/TiO2纳米复合材料及光催化性能的研究

Low-temperature Synthesis of Metallic Silver Particles Doped TiO2 and its Photocatalytic Activity

  • 摘要: 丹宁酸为保护剂,氧化还原法制得纳米银溶胶,以钛酸四丁酯、自制纳米银溶胶为原料,采用溶胶-凝胶法,在70℃下制备了Ag/TiO2纳米复合材料,经过XRD和TEM确证了材料中含有锐钛矿TiO2,经XPS确证有单质银粒子的存在。以甲基橙溶液为模拟污染物,研究了银掺入量、Ag/TiO2的用量、甲基橙的初始浓度对Ag/TiO2纳米复合材料光催化活性的影响。结果表明:随着银掺入量的增加,Ag/TiO2纳米复合材料光催化活性先增加后减小。当纳米银质量分数为18%时, Ag/TiO2复合材料具有较好的光催化活性;Ag/TiO2复合材料光催化活性随着Ag/TiO2复合材料的用量的增加先增加后减少。当Ag/TiO2用量体积分数为10%时,Ag/TiO2具有较好的光催化活性;在紫外-可见分光光度计能测量的浓度范围内随着甲基橙初始浓度的增加,Ag/TiO2复合材料光催化活性一直呈增加趋势。

     

    Abstract: Photocatalyst composite materials consisting of silver and titanium dioxide were synthesized at low temperature (70℃) by a modified sol-gel method using tetrabutyl titanate and homemade nanosilver solution. Homemade nanosilver solution was synthesized by using tannic acid as a protective agent.Characterization methods including scanning electron microscope, transmission electron microscope, and X-ray diffraction are employed to prove the existence of TiO2. Moreover, X-ray photoelectron spectroscopy is employed to prove the existence of metallic silver Particles. Using methyl orange as simulated pollutant,the influence of content of Ag, Ag/TiO2 and different initial concentration of methyl orange on photocatalytic activity of Ag/TiO2 composite material were examined. The results shown that the photocatalytic activity of Ag/TiO2 composite materials increases at first and then decreases with the increase of content of Ag as well as the amount of Ag/TiO2. Finally, we get the best activity photocatalyst when the content of Ag is 0.18% and the amount of Ag/TiO2 is 10mL. The photocatalytic activity of Ag/TiO2 composite materials enhanced with the increase of initial concentration of methyl orange within the range of concentration that can be measured by uv-vis spectrophotometer.

     

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