Eu／TiO2光催化降解部分水解聚丙烯酰胺影响因素研究

Research of Photocatalytic Degradation Partially Hydrolyzed Polyacrylamide Influence Factors in the Presence of Eu/TiO2

考查了以四异氧丙基钛(TTIP)为钛源,采用溶胶-凝胶的合成方法制备Eu掺杂TiO2纳米晶催化剂.运用X射线粉体衍射光谱仪(XRD)检测到制备的复合物具有锐钛矿晶型、透射电镜(TEM)和N2吸附表征催化剂的形貌和吸附特性:Eu/TiO2纳米晶粒子分散均匀,平均粒径为9 nm左右.比表面积107 m2/g,孔体积0.5 cm3/g、孔径14.0 nm.此外,研究了在紫外光作用下催化条件对光催化降解部分水解聚丙烯酰胺的影响,如:光催化时间、催化剂的浓度、HAPM的初始浓度、反应的pH值及Na2CO3,NaHCO3和NaCl浓度对催化的影响.结果表明,除NaCl外,其它条件对HPAM的催化降解均有显著的影响.增加催化时间、最佳的催化剂浓度、pH^6和较低的初始浓度有利于催化反应的进行.

Eu doping TiO2 Nanocrystal was prepared by sol-gel and solvothermal synthetic method using titanium tetraisopropoxide （TRIP） as titanium source. Wide-angle X-ray powder diffraction （XRD） revealed the existence of anatase phase structure. Transmission Electron Microscopy （TEM） and N2 adsorption desorption isotherms were utilized for further morphology and textural properties of catalysts. In addition, the photocatalytic degradation of partially hydrolyzed polyacrylamide （HPAM） has been studied in the presence of UV light under different conditions such as pH, catalyst concentration, substrate concentration, Na2CO3, NaHCO3 and NaCl. The degradation of HPAM was found to be strongly influenced by all the above parameters except for NaCl concentration. Increasing reaction time, optimal concentration of catalyst, pH - 6 and lower substrate concentration are in favor of photocatalytic reaction.