【作者】 张悦；

【导师】 王宏；

【作者基本信息】 沈阳理工大学 ， 环境科学与工程， 2021， 硕士

【摘要】 本论文主要以溶胶凝胶法制备钛酸盐材料,并利用模板剂、负载和负载基础上添加模板剂三种改性手法对纯钛酸盐材料进行改性,得到三种不同改性条件下的光催化材料。以PEG4000为模板剂,对纯钛酸锌进行改性,得到活性较好的多孔钛酸锌,并探究PEG4000的投加量和煅烧温度对光催化剂的影响;以石英砂为负载,制备出ZnTiO₃/SiO₂催化剂,并探究负载量对催化剂活性的影响;以最好石英砂负载量的催化剂为基础,继续利用PEG4000对其进行改性,并探究石英砂和PEG4000的共同作用对光催化剂催化效果的影响。最后利用XRD、SEM、TEM、FT-IR/FIR、UV-Vis DRS、BET、BJH及XPS等表征手段对所制备催化剂进行表征,观察并分析催化剂的各种参数,形貌以及性质对催化效果的影响。以活性艳红X-3B为降解染料,利用UV-Vis和分光光度计等手段对降解产物进行分析。（1）以PEG4000为模板剂,利用溶胶凝胶法制备多孔ZnTiO₃催化剂。PEG4000在一定程度有助于晶体的生长,但投加量过多时,会生成Zn₂TiO₄。模板剂可以增大比表面积和孔容,使催化剂原本的大颗粒变的疏松多孔,从而提高光催化活性。当煅烧温度较低时,晶体未成型,当煅烧温度过高时,又会生成其他杂质。所以当煅烧温度为800℃,PEG4000投加量为1.5 g时,催化剂在紫外灯30 min的照射下,对活性艳红显示出最高的降解效率,为79.8%。（2）以石英砂为负载,利用溶胶凝胶法制备负载型ZnTiO₃催化剂。负载后的样品不但晶粒尺寸有所增加,而且较纯ZnTiO₃有更大的比表面积和孔容,这都导致催化剂对活性艳红降解效率的提高。经紫外光照射30 min后,负载量为50%时的光催化剂降解效率最高,可达59.2%,而此时未经改性的钛酸锌的降解率仅为24.4%。（3）利用溶胶凝胶法制备钛酸盐材料,以50%ZnTiO₃/SiO₂为基础,加入不同量的PEG4000对其进一步改性,得到50%ZnTiO₃/SiO₂（nPEG4000）。模板剂的加入并未改变晶体结构,并且会增大催化剂的比表面积和孔容,使催化剂形成更多的介孔,从而提高光催化效率。经紫外灯照射30 min后,50%ZnTiO₃/SiO₂（1.5PEG4000）的催化剂表现出最好的活性,此时对活性艳红的降解率可达52.3%。更多还原

【Abstract】 In this thesis,the titanate material is prepared by the sol-gel method,and the pure titanate material is modified by three modification methods of template agent,loading and loading basis by adding the template agent,and obtained three photocatalytic materials under different modified conditions.Using PEG4000 as a template,the pure zinc titanate was modified to obtain a porous zinc titanate with better activity,and the influence of the dosage of PEG4000and the calcination temperature on the photocatalyst was explored;ZnTiO₃/SiO₂ photocatalyst was prepared with quartz sand as the support,and explore the effect of loading on the photocatalyst activity;based on the best silica sand loading photocatalyst,then continue to use PEG4000 to modify it,and explore the combined effect of quartz sand and PEG4000 on the photocatalyst catalytic effect influences.Finally,use XRD,SEM,TEM,FT-IR/FIR,UV-Vis DRS,BET,BJH,XPS and other characterization methods to characterize the prepared photocatalyst,observe and analyze the various parameters,morphology and properties of the catalyst on the catalytic effect impact.Using Reactive Brilliant Red X-3B as the degradation dye,the degradation products were analyzed by UV-Vis and spectrophotometer.（1）Using PEG4000 as a template,a porous ZnTiO₃ catalyst was prepared by the sol-gel method.PEG4000 helps crystal growth to a certain extent,but when the dosage is too much,Zn₂TiO₄ will be formed.The template agent can increase the specific surface area and pore volume,make the original large particles of the catalyst loose and porous,thereby improving the photocatalytic activity.When the calcination temperature is low,the crystal is not shaped,and when the calcination temperature is too high,other impurities will be generated.Therefore,when the calcination temperature is 800℃and the dosage of PEG4000 is 1.5 g,The catalyst showed the highest degradation efficiency of 79.8%for Reactive Brilliant Red under the irradiation of UV lamp for 30 min.（2）The supported ZnTiO₃ catalyst was prepared by the sol-gel method with quartz sand as the support.The loaded sample not only increased the grain size,but also had a larger specific surface area and pore volume than pure ZnTiO₃,which led to the improvement of the catalyst’s degradation efficiency of Reactive Brilliant Red X-3B.After being irradiated with ultraviolet light for 30 min,the degradation efficiency of the photocatalyst at 50%loading was the highest,reaching 59.2%,while the degradation rate of unmodified zinc titanate was only 24.4%.（3）The titanate material was prepared by the sol-gel method.Based on 50%ZnTiO₃/SiO₂,different amounts of PEG4000 were added to further modify it to obtain 50%ZnTiO₃/SiO₂（nPEG4000）.The addition of the template agent does not change the crystal structure,and will increase the specific surface area and pore volume of the catalyst,so that the catalyst will form more mesopores,thereby improving the photocatalytic efficiency.After 30 min of UV light irradiation,the 50%ZnTiO₃/SiO₂（1.5PEG4000）catalyst showed the best activity,and the degradation rate of Reactive Brilliant Red X-3B could reach 52.3%.更多还原