摘要
采用溶胶-凝胶法制备了系列生物质改性复合纳米TiO_2。以亚甲基蓝溶液为模拟污染物,考察了其可见光催化活性,并确定了最佳制备工艺。通过X射线光电子能谱(XPS)、X射线衍射(XRD)、场发射扫描电镜(FESEM)、紫外-可见漫反射光谱(UV-Vis-DRS)、荧光光谱(PL)等手段对催化剂样品进行了表征。实验结果表明,催化剂对亚甲基蓝的光催化降解适应一级反应动力学,复合TiO_2和纯TiO_2的反应速率常数分别为0.4990 h-1和0.0305h-1,且复合催化剂实现了C、N、S、P、K等多元素的共掺杂。相比纯TiO_2,复合TiO_2的比表面积增大,结晶度升高,光生载流子复合率降低,吸收边带红移,禁带宽度窄化了0.09 e V。
A series of biomass modified composite nano TiO2 were prepared by sol-gel method.The visible photocatalytic activity was investigated and the optimum preparation process was determined,using methylene blue solution as a simulated pollutant.The catalysts were characterized by X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM),ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis-DRS)and fluorescence spectroscopy(PL).The experimental results show that the photocatalytic degradation of methylene blue is adapted to the firstorder reaction kinetics,and the reaction rate constants of composite titanium dioxide and pure titanium dioxide are 0.4990 h^-1 and 0.0305 h^-1,respectively.The composite catalyst realizes the simultaneous doping of C,N,S,P,K and other elements.Compared with pure titanium dioxide,the specific surface area of composite titanium dioxide increases,the crystallinity increases,the recombination rate of photogenerated carriers decreases,the absorption sideband redshifts,and the band gap narrows by0.09 e V.
作者
赵林
谢艳招
王丽丹
戴艺彬
刁勇
ZHAO Lin;XIE Yan-zhao;WANG Li-dan;DAI Yi-bin;DIAO Yong(School of Medicine,Huaqiao University,Quanzhou 362021,China;Minnan Science and Technology Institute,Fujian Normal University,Quanzhou 362332,China)
出处
《人工晶体学报》
EI
CAS
北大核心
2019年第3期470-476,481,共8页
Journal of Synthetic Crystals
基金
国家自然科学基金(U1405215)
福建省教育厅科技类(产学研)资助项目(JAT160671)
福建省泉州市科技局资助项目(2016G061)
