CAJ | 학술논문

采用溶胶-凝胶法制备出偏硼酸锶(SrB2O4)光催化剂.紫外光催化还原CO2合成CH4(在液相水中)的实验证明: SrB2O4催化剂的光催化活性略高于TiO2(P25).利用X射线电子衍射谱(XRD)、傅里叶变换红外(FTIR)光谱、X射线光电子能谱(XPS)、透射电子显微镜(TEM)、荧光(PL)光谱和紫外-可见(UV-Vis)漫反射吸收光谱等技术,研究了 SrB2O4催化剂的晶体结构、形貌和能带结构.结果表明: SrB2O4的价带为2.07 V (vs normal hydrogen electrode (NHE)),低于(H2O/H +)的氧化还原电位 E oredox (0.82 V (vs NHE));而导带为-1.47 V (vs NHE),高于(CO2/CH4)的氧化还原电位Eoredox (-0.24 V (vs NHE)).因此, SrB2O4催化剂可以有效地光催化还原CO2生成CH4.与TiO2(P25)相比, SrB2O4催化剂具有相对较高导带,光生电子的还原能力强于TiO2(P25),更有利于CH4的生成,从而决定了SrB2O4催化剂光催化还原CO2合成CH4具有较高的光催化活性.
채용용효-응효법제비출편붕산송(SrB2O4)광최화제.자외광최화환원CO2합성CH4(재액상수중)적실험증명: SrB2O4최화제적광최화활성략고우TiO2(P25).이용X사선전자연사보(XRD)、부리협변환홍외(FTIR)광보、X사선광전자능보(XPS)、투사전자현미경(TEM)、형광(PL)광보화자외-가견(UV-Vis)만반사흡수광보등기술,연구료 SrB2O4최화제적정체결구、형모화능대결구.결과표명: SrB2O4적개대위2.07 V (vs normal hydrogen electrode (NHE)),저우(H2O/H +)적양화환원전위 E oredox (0.82 V (vs NHE));이도대위-1.47 V (vs NHE),고우(CO2/CH4)적양화환원전위Eoredox (-0.24 V (vs NHE)).인차, SrB2O4최화제가이유효지광최화환원CO2생성CH4.여TiO2(P25)상비, SrB2O4최화제구유상대교고도대,광생전자적환원능력강우TiO2(P25),경유리우CH4적생성,종이결정료SrB2O4최화제광최화환원CO2합성CH4구유교고적광최화활성.
The reduction of carbon dioxide to methane in the presence of water was used to evaluate the photocatalytic activity of a prepared strontium metaborate (SrB2O4) catalyst. The strontium metaborate was prepared by a simple sol-gel method, and was shown to exhibit better photocatalytic performance than TiO2 (P25) under UV-light irradiation. The structure, morphology, and energy levels of the photocatalysts were studied by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), photoluminescence (PL) spectroscopy, and UV-Vis diffuse reflectance absorption spectroscopy. It was revealed that the SrB2O4 valence band (VB) was located at 2.07 V (vs normal hydrogen electrode, NHE), which is more positive than Eoredox (H2O/H+) (0.82 V (vs NHE)); the conduction band was estimated to be -1.47 V (vs NHE)), which is more negative than Eoredox (CO2/CH4) (-0.24 V (vs NHE)). Therefore, it is clear that strontium metaborate is capable of transforming CO2 into CH4. Moreover, the potential at the bottom of the conduction band for SrB2O4 is more negative than that for TiO2(P25), leading to a higher deoxidization capacity, which also favors CH4 formation. Thus, SrB2O4 exhibits a higher photocatalytic activity than TiO2(P25).