摘要
In this study,a straightforward one-step hydrothermal method was successfully utilized to synthesize the solid solution Na_(0.9)Mg_(0.45)Ti_(3.55)O_(8)-Na_(2)Ni_(2)Ti_(6)O_(16)(NNMTO-x),where x denotes the molar percentage of Na_(2)Ni_(2)Ti_(6)O_(16)(NNTO)within Na_(0.9)Mg_(0.45)Ti_(3.55)O_(8)(NMTO),with x values of 10,20,30,40,and 50.Both XPS(X-ray Photoelectron Spectroscopy)and EDX(Energy Dispersive X-ray Spectroscopy)analyses unequivocally validated the formation of the NNMTO-x solid solutions.It was observed that when x is below 40,the NNMTO-x solid solution retains the structural characteristics of the original NMTO.However,beyond this threshold,significant alterations in crystal morphology were noted,accompanied by a noticeable decline in photocatalytic activity.Notably,the absorption edge of NNMTO-x(x<40)exhibited a shift towards the visible-light spectrum,thereby substantially broadening the absorption range.The findings highlight that NNMTO-30 possesses the most pronounced photocatalytic activity for the reduction of CO_(2).Specifically,after a 6 h irradiation period,the production rates of CO and CH_(4)were recorded at 42.38 and 1.47μmol/g,respectively.This investigation provides pivotal insights that are instrumental in the advancement of highly efficient and stable photocatalysts tailored for CO_(2)reduction processes.
本研究通过一步水热法制备了Na_(0.9)Mg_(0.45)Ti_(3.55)O_(8)-Na_(2)Ni_(2)Ti_(6)O_(16)(NNMTO)固溶体,其中,x表示Na_(2)Ni_(2)Ti_(6)O_(16)(NNTO)在固溶体NNMTO-x中的物质的量比,x值分别为10、20、30、40和50。通过综合运用X射线光电子能谱(XPS)和能量色散X射线光谱(EDX)技术进行表征分析,证实了NNMTO-x系列固溶体的有效形成。实验结果表明,当x值低于40时,NNMTO-x固溶体能够保持原始Na_(0.9)Mg_(0.4)5Ti_(3.55)O_(8)(NMTO)的结构特征;当x值超过40时,晶体形态发生显著变化,并伴随光催化性能的明显下降。当x值低于40时,NNMTO-x固溶体的吸收边带向可见光区域显著偏移,从而明显拓宽了其光吸收范围。NNMTO-30表现出最优异的光催化还原活性,在6 h光照条件下,其CO和CH_(4)的生成速率分别达到42.38和1.47μmol/g。本研究为开发高效、稳定的二氧化碳还原光催化剂提供了重要的理论依据和实践指导,对推动光催化CO_(2)还原技术的发展具有重要的科学意义和应用价值。
出处
《燃料化学学报(中英文)》
北大核心
2026年第1期15-25,共11页
Journal of Fuel Chemistry and Technology
基金
Supported by the Doctoral Research Start-up Project of Yuncheng University(YQ-2023067)
Project of Shanxi Natural Science Foundation(202303021211189)
Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Provinces(20220036)
Shanxi ProvinceIntelligent Optoelectronic Sensing Application Technology Innovation Center and Shanxi Province Optoelectronic Information Science and TechnologyLaboratory,Yuncheng University.
