The Effect Of Transition Metal Doping （Fe,Cu,Ni,Zn） On The Band Structure Of CeO₂ And Their Photocatalytic Performance For The Degradation Of Rhodamine B

The most serious problem now faced is the water pollution which gets worse increasingly, it is very hard to degrade the deleterious organic pollutant in the pollution water. The Rhodamine B is one of the deleterious organic pollutant, which has caused serious harm to the human health. In view of this serious reality, according to the characteristics of CeO2 with photocatalysis, this paper discusses the transition metal elements (Fe, Cu, Ni, Zn) influence on the band gap of CeO2, and discuss the composite materials photocatalytic degradation of Rhodamin B. Expected to prepare CeO2 composite photocatalyst which have high degradation rate of Rhodamine B.In this paper the nitrate cerium and the nitrate of the transition metal (Fe, Cu, Ni, Zn) as raw materials. Using sodium carbonate, ammonium cicarbonate as precipitant, study on the effect of calcination temperature, doping concentration, different precipitant on the band gap of CeO2 composite materials by coprecipition method. And characterized by XRD, SEM, BET and UV-vis etc..Firstly, preparation of composite materials with Na2CO3 and calcined with 800 degrees Celsius, but preparation materials are not pure phase. According to the problem may be the calcination temperature, so in the next task is to lower the sintering temperature. Synthetise Fe doped CeO2 composite materials calcined with 500 degrees Celsius, the prepared samples are pure phase. Synthetise Cu, Ni, Zn doped CeO2 composite materials with NH4HCO3 as precipitant and calcined with 400 degrees Celsius, the prepared samples are pure phase, but the samples synthetise with Na2CO3 are not pure phase.Finally, to evaluate the photocatalytic degradation capability of composite materials, we examined the decomposition of Rhodamine B in water under visible light irradiation. In all catalysts, the doping amount is 5%, synthetise Ni, Zn doped CeO2 composite materials with NH4HCO3 as precipitant, the catalytic effect of degradation is the best, after 270 min of the reaction, the degradation rate can reach 100%.