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

At present, the world is facing an increasingly serious environmental and energy issues, such as energy shortages、environmental pollution problems threaten people’s lives and production seriously. Semiconductor photocatalysis can use light degradation of pollutants therefore attracted more attention. Since 1970s, Japanese scholars Fujishima et al reported the TiO2 electrode decomposition of water into hydrogen, as its photocatalytic technology has been developed rapidly. Although TiO2 with good stability, non-toxicity and high catalytic activity, the band gap of TiO2 is 3.2 eV, can only be aroused by UV excitationThe silver-based semiconductor photocatalyst as a new hotspot in recent years, the silver-based semiconductor photocatalyst exhibit better catalytic activity. Silver-based semiconductor photocatalysts can absorb visible light and exhibit a better catalytic activity because it’s narrow band gap. Wherein the silver-based solid solution photocatalyst can achieve regulation constantly by changing the potential of the valence band and the conduction band position or changing both of the energy band gap structure. Such as the photocatalyst of β-AgAl1-xGaxO2, when x of changed from 0 to 1, the solid solution can changed accordingly. Although β-AgAl1-xGaxO2 can achieve visible light response and the energy gap can get changed continuously, etc., the β-AgAl1-xGaxO2 surface area is small, less reactive sites, photo-generated electron-hole pairs easily complex, resulting in lower photocatalytic activity.In order to resolve these shortcomings, the mesoporous β-AgAl1-xGaxO2 can made a good improvement. Studies show that mesoporous materials can accelerate the migration of photo-generated electrons, reducing raw light electron-hole pair recombination, greatly improving the photocatalytic activity due to its high crystallinity and continuous rule.The main contents of this paper are:Firstly, the three-block copolymer (P123) as template, TEOS as silica source, hydrothermal synthesis of mesoporous SBA-15; secondly, SBA-15 as a template and sucrose as carbon source final carbonization method after sulfuric acid to remove the synthesis template mesoporous sieve CMK-3; Finally, CMK-3 as a template, sodium acetate, aluminum nitrate, gallium nitrate precursor mixed solution after repeated except carbon impregnated synthetic β-AgAl1-xGaxO2, then use silver nitrate β-AgAl1-xGaxO2 replacement of Na eventually form mesoporous β-AgAl1-xGaxO2.