Preparation, Characterization And Performance Of Visible-Light Response Silver-Based Solid Solution

Environmental pollution is one of the great challenges which nowadays society must face. Photocatalystic technology based on solar energy is efficient to dispose organic dyes pollution, so it can become a kind of new method that owns properties of low spending, high efficiency to dispose of environmental pollution. The problems which traditional photocatalysitic materials would face are narrow range of sunlight responsivity, low quantum efficiency and etc. In recent years, developing new visible-light response photocatalystic materials is research focus in photocatalystic field. The photocatalytic solid-solution material is made of two kinds of semiconductors. Its electronic structure is influenced by constituent of solid-solution. The semiconductor band gap values continuously modulated with changing the constituent of semiconductor can come ture. It is obvious that light absorption can be extended into the visible region by photocatalytic silver-based solid-solution material. Meanwhile this material has properties of high photocatalytic activity and thermal stability, this material also has great superiority and potential application in the photocatalytic field.In this thesis, β-NaAl1-xGaxO2 which enenrgy gap values can be continuously modulated were synthesized with CH3COONa, Al(NO3)3·9H2O, Ga(NO3)3·nH2O with the changing molar ratio of Ga3+/Al3+ by a sol-gel method combined with a cation exchange reaction in subsequent. Mesoporous β-AgAl0.4Ga0.6O2 was synthesized by method of impregnation after removing the carbon by calcinations with a cation exchange reaction in subsequent. This paper also introduces the synthesis of SBA-15,CMK-3 templates. Above all, mesoporous C (CMK-3) as auxiliary template carbon in the method of impregnation synthesized mesoporous β-AgAl0.4Ga0.6O2. And noble metal silver deposited on P-AgAl0.4Ga0.6O2 by photo chemical deposition method.The crystal structure and mesostructure were investigated by X-ray diffraction (XRD) on the PANalytical Empyrean diffractometer. The morphologies were characterized by the Hitachi S-4800 scanning electron microscopy (SEM). N2 adsorption-desorption isotherms of mesoporous β-AgAl0.4Ga0.6O2 were measured with a Micromeritics ASAP2020 specific surface area analyzer. UV spectra were recorded by a Hitachi U-3900 UV-Vis spectrophotometer. The energy band values were calculated by means of Kubelka-Munk method. The phototluminescence spectra were recorded by a Hitachi F-7000 phototluminescence spectrophotometer. The series of experiment results indicate that β-AgAl1-xGaxO2 realized that continuous modulation of optical band gap by changing the constitute of the silver-based solid solution. Moreover, they broadened the scope of visible-light responsivity and improved photocatalytic performance of silver-based solid solution. Mesoporous β-AgAl0.4Ga0.6O2 enhanced specific surface area of silver-based solid solution. It is possible that P-AgAl0.4Ga0.6O2 further enhances photocatalytic performance and noble metal silver deposition on β-AgAl0.4Ga0.6O2 is also a feasible methodWe researched the photocatalytic performance of β-AgAl1-xGaxO2 samples by methyl orange as the research object. β-AgAl1-xGaxO2 samples which we have synthesized have good photocatalytic performance. Among them, β-AgAl0.2Ga0.8O2 has the best photocatalytic performance. The study shows that β-AgAl1-xGaxO2 can make more use of solar energy to degrade organic dyes in sewage by continuously modulating the energy band of silver-based solid solution.