共掺杂型tio2可见光催化剂的制备、表征及其性能的分析研究.pdf

中文摘要中文摘要纳米Ti02光催化技术是一种高效、环保的污染控制技术,提高其光催化活性及对可见光的利用率是当前研究的主要内容。在国内外对元素掺杂前02光催化剂的研究现状基础上,本论文制各了两类三元素共掺杂改性的纳米l"i02光催化剂, 、、拉曼光谱、、.傅立叶变换红外光谱、扫描电子显微镜、透射电子显微镜、。研究了共掺杂型催化剂的可见光催化活性,并与自制Ti02及Degussa P25Ti02的性能作了比较,分析了改性Ti02有效提高可见光催化活性的作用机制。(1)以硫酸亚铁铵为掺杂剂,、N、S三元素共掺杂改性的Ti02(Fe-)光催化剂,研究了硫酸亚铁铵的添加量及热处理温度对Ti02结构及可见光催化性能的影响。实验发现,Fe-。当(NH4)2Fe(S04)%时,350"(2热处理温度下合成的样品可见光催化活性最好,%。(2)以生物小分子胱氨酸为掺杂剂,、N、S 三元素共掺杂改性的Ti02(C-)光催化剂,重点研究了胱氨酸的添加量及热处理温度对面02结构及光催化性能的影响。实验发现,C-。当C2H12N204S2/Ti02摩尔比为‘%时,350"C热处理温度下合成的样品可见光催化活性最好,光照120min对罗丹明B的降解率高达100%。(3)以350W氙灯为光源,考察了两类催化剂在模拟太阳光下对苯酚的降解效果。结果表明,C-—Ti02与Fe-N—’,反应遵循Langmuir-Hinshelwood()一级反应动力学模型, C-N—S—Ti02反应速率较快,~,。关键词:二氧化钛;三元素共掺杂;可见光;罗丹明B;苯酚黑龙江大学硕士学位论文删㈦磐㈣ Y1 940977 Abstract Nano—sized Ti02 photocatalytic technology hasdeveloped tobe akind ofhigll efficient andenvironmentalpollution current researchfocuses on theenhancement ofphotocatalytic activity andtheefficiency ofutilizing visible—light. Based onthe current research ofphotocatalyst doping Ti02 home andabroad,tri—doped Ti02 nano—particles were synthetized structures and physical and chemicalproperties oftheas··preparedsamples werecharacterized byX--ray diffraction (XRD),nitrogen adsorption/desorption measurements(BET),Raman spectroscopy (Raman),X—ray photoelectron spectroscopy(xPs),Fourier transitioninfraredspectra fiT-m),scanning electron microscopy(SEM),transmission electron microscopy (TEM),UV-Vis diffuse reflectance spectroscopy(DRS)and surface photo-voltage spectroscopy(sPs).The photocatalytic activitiesofthetri—dopedTi02photocatalysts were evaluated through the degradation ofRhB and phenol under visible—light irradiation,which pared withthe behaviors ofthehome-made pure mercial Degussa