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The Degradation of RB Catalyzed by Ln/TiO2 and the Preparation of Pybox

Author: XuHaiLiang
Tutor: ZhangYuHong
School: Zhejiang University
Course: Organic Chemistry
Keywords: Rare earth doped Rhodamine Ligands Photocatalytic Activity Calcination temperature Titanium dioxide High temperature conditions Nanomaterials Photodegradation mechanism Calcination process
CLC: O641.4
Type: Master's thesis
Year: 2006
Downloads: 420
Quote: 1
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Abstract


By sol - gel preparation of series Nd 3 Pr 3 of Er 3 and Dy , 3 uniform doped nano-titanium dioxide (Ln / TiO 2 ) material . The phase and the particle size variation of the titania-doped materials at different temperatures . The four rare earth ion doped titanium dioxide material photocatalyst on the photocatalytic degradation efficiency of the aqueous solution of rhodamine B (RB) and optical degradation mechanism . The research results show that the rare earth ion doped suppressed in the high-temperature calcination process in high temperature conditions to maintain the stability of the nano - titanium dioxide titanium dioxide from anatase to rutile phase transformation, and inhibit the sintering of nano-titanium dioxide under high temperature conditions , has role. The doping concentration and the calcining temperature of the rare earth element have a significant impact on photocatalytic activity . When the calcination temperature of 500 ° C , only 0.25% of the rare-earth-doped titanium dioxide catalytic performance , there was significantly increased, when the rare earth content up to 1% , the highest photocatalytic activity , catalytic efficiency was 3.3 × 10 -3 < / sup> mM / min. When the calcination temperature of 700 ° C , pure titanium dioxide photocatalytic activity declined significantly , but the rare-earth-doped samples with high catalytic activity , indicating that the good prospects of the rare-earth-doped titanium dioxide nanomaterials in high temperature applications . By HPLC-MS study the degradation process by Ln / TiO 2 catalytic degradation of Rhodamine B is a by gradual dissociation of ethyl last completely decomposed photochemical process . In addition, the paper as raw material with acetone , after a seven-step synthesis steps to prepare four replaced the chiral bisoxazoline pyridine ligands . The ligand can generate a variety of effective chiral catalysts with a variety of metal ion coordination , and has broad application prospects .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Structural Chemistry > Complex chemistry ( coordination chemistry )
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