C,S共掺杂介孔纳米TiO_(2)的制备及其光催化性能

Carbon-sulfur nonmetals codoped mesoporous TiO_(2) nanocomposites to boost photocatalytic activity

以钛酸四丁酯为前体、表面活性剂十二烷基磺酸钠(SDS)为C源和S源,采用溶胶-凝胶结合蒸发诱导自组装法合成了C,S共掺杂的介孔纳米TiO_(2)(C,S-TiO_(2)),利用XRD,SEM,TEM,EDX,N_(2)吸附-脱附,XPS,UV-Vis漫反散和光致发光光谱等分析方法对所合成C,S-TiO_(2)进行表征,并通过光催化降解罗丹明B(RhB)考察了C,S-TiO_(2)的光催化活性和稳定性。实验结果表明,所制备的C,S-TiO_(2)材料具有较大的比表面积和均匀的孔径,C和S的共掺杂拓宽了TiO_(2)的光吸收范围,促进了光生载流子的分离,提高了TiO_(2)的光催化性能。当SDS添加量为2 g时,C,S-TiO_(2)的光催化性能最优,对RhB的光降解率达94.75%,催化剂经5次循环使用后,RhB的降解率仍保持在90%左右,具有优异的稳定性和可回收性。

C,S codoped mesoporous TiO_(2)(C,S-TiO_(2)) nanocomposites were synthesized via sol-gel method integrated with evaporation-induced self-assembly approach.The tetrabutyl titanate was used as the precursor,while sodium dodecyl sulfonate(SDS)was used as the carbon and sulfur sources.The physical and chemical properties of the synthesized composites were analyzed by XRD,SEM,TEM,EDX,N_(2) adsorption-desoption,XPS,UV-Vis and PL.The photocatalytic activity and stability of C,S-TiO_(2) were investigated by photocatalytic degradation of Rhodamine B(RhB).The results revealed that the C,S-TiO_(2) composite exhibited a large specific surface area and uniform pore sizes.Furthermore,the codoping of C and S on TiO_(2) have improved the ultraviolet-visible light absorption,the separation efficiency of carriers,and the photocatalytic performance.When 2 g SDS was added,the C,S-TiO_(2) composites exhibited the highest photocatalytic activity,and 94.75%of the RhB was photodegraded.After five cycles,the photocatalytic degradation efficiency of RhB remained at about 90%,indicating that the C,S-TiO_(2) composite has an excellent stability and recoverability.