CeO_(2)@AC合成及其光催化性能研究

A study on the synthesis and photocatalytic performance of CeO_(2)@AC

分别以Ce(NO_(3))_(3)·6H_(2)O、活性炭(AC)为铈源和碳源,利用氨水调节反应体系pH,室温下使Ce^(3+)形成氢氧化铈并沉积在活性炭表面,经陈化、过滤、洗涤、干燥等步骤得到催化剂前驱物,前驱物经煅烧后得到CeO_(2)@AC.分别采用X射线粉末衍射(XRD)、紫外-可见分光光度计(UV-Vis)、红外光谱(FT-IR)和拉曼(Raman)光谱等技术对产物结构性能进行表征.用罗丹明B(RhB)溶液的光催化降解效率评价CeO_(2)@AC的光催化活性,并考察煅烧温度、活性炭用量及催化体系pH对光催化效率的影响.结果表明:产物为立方萤石结构CeO_(2);当煅烧温度为600℃,碳掺杂量为5%,pH=4时,合成催化剂对RhB的光催化效果最好;合成产物CeO_(2)@AC的光催化效率高于以商用CeO_(2)和活性炭为合成材料的光催化效率.该研究可为相关材料合成及其应用提供借鉴.

Using Ce(NO_(3))3·6H_(2)O and activated carbon(AC)as cerium and carbon sources,the precursor of CeO_(2)@AC was synthesized by the following steps.Ce^(3+)was precipitated to Ce(OH)_(3)by adding of aqueous ammonia and Ce(OH)_(3)was deposited on the surface of activated carbon.After being aged,filtered,washed and dried,the catalyst precursor was obtained.The resulting AC@CeO_(2)was obtained by calcinating the precursor.The structure and properties of the product were characterized by X-ray powder diffraction(XRD),ultraviolet visible spectrophotometer(UV-Vis),infrared spectroscopy(FT-IR)and Raman spectroscopy,respectively.The photocatalytic activity of CeO_(2)@AC was evaluated through the photocatalytic degradation of RhB.Additionally,the effect of calcination temperatures,amount of activated carbon and pH of the catalytic system on the photocatalytic activity were investigated.The results showed that the product was CeO_(2)with a cubic fluorite structure.Furthermore,it was observed that the photocatalytic efficiency of RhB was the highest at a calcination temperature of 600℃,with a carbon doping level of 5%and a pH of 4.Additionally,the photocatalytic activity of the resulting sample was found to be higher than that of the sample synthesized by commercial CeO_(2)and activated carbon.This study would provide a reference for the synthesis and application of materials related to it.