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Preparation of TiO_2.activated carbon with Fe ions doping photocatalyst and its application to photocatalytic degradation of reactive brilliant red K2.

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Science china chemistry 2009年第8期52卷 1113-1119页

作者： li youji,li {2.,ma mingyuan,ouyang yuzhu & yan wenbin college of chemistry and chemical Engineering,{12. university,{12. 416000,china 1. college of chemistry and {2. Engineering Jishou University Jishou 416000 China

Titanium dioxide coated on activated carbon(AC) with Fe ions doping(Fe-TiO2.AC) composite was prepared by an improved sol-gel *** photocatalytic activities were tested by photocatalytic degradation of reactive brilliant red K2. in *** results show that in comparison with the agglomeration of pure TiO2.the TiO2.nanoparticles are well dispersed in the AC matrix,of which sizes are decreased with Fe ions ***,the iron species on TiO2.of composite are Fe2.3 and FeO,which do not affect the crystalline structures of TiO2.*** AC matrix and iron doping content influence the fluorescence intensity of composite due to their effects on recombination probability of hole-electron *** with TiO2.0.3% Fe-TiO2.TiO2.AC,0.5% Fe-TiO2.AC and 0.1% Fe-TiO2.AC,the 0.3% Fe-TiO2.AC shows the highest photoactivity with the complete mineralization of K2. for finite time due to the optimum Fe ions content and AC ***,the kinetic constant(k=0.02.9 min-1) of 0.3% Fe-TiO2.AC composite is more than the sum of both TiO2.AC(0.0154 min-1) and 0.3% Fe-TiO2.0.0057 min-1) because coexistence of the AC and Fe ions has an enlarging effect on improving the photoactivity of TiO2.

关键词： TiO2 nanoparticles Fe ions activated carbon photocatalysis reactive brilliant red K2.

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Preparation and photocatalytic activity of TiO_2.coated granular activated carbon composites by a molecular adsorption-deposition method

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Science china chemistry 2008年第11期51卷 1036-1043页

作者： li youji, li jing,{2., ouyang yuzhu & yan wenbin college of chemistry and chemical Engineering, jishou university, jishou 416000,{12. 1. college of chemistry and {2. Engineering Jishou University Jishou 416000 China

TiO2.nanoparticle-coated granular activated carbon (GAC) composite photocatalysts (CPs) were suc-cessfully prepared by a molecular adsorption-deposition (maD) method. The CPs were detected by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), BET surface area and UV-Vis adsorption spectroscopy, and their photoactivity was evaluated by methyl orange (MO) photodegradation. The results show that small-sized TiO2.nanoparticles were dispersed well, deposited on the surface of GAC, and showed s{2.ght blue shift in comparison with pure TiO2. With the increase in TiO2.content, the CPs showed band gaps in lower energy, smaller surface areas and the higher content of Ti3+ ions. Compared with pure TiO2.and others CPs samples, CPs-382.sample showed the highest photoactivity due to the optimum TiO2.content and surface area besides the synergic effect of photocatalytic degradation of TiO2.and adsorptive property of GAC. In addition, the CPs could be very easily reclaimed, recycled and reused for methyl orange removal while high photoactivity is pre-served.

关键词： photocatalysis titanium dioxide granular activation carbon composites molecular adsorption–deposition method

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