摘要
通过将镁粉和二氧化钛纳米粒子的混合物于氢气气氛中,550℃煅烧得到镁离子掺杂的氢化二氧化钛(MHTO-550)催化剂.Mg 2+掺杂及表面丰富的缺陷不仅增强CO_(2)在MHTO-550表面的吸附,而且促进光生电子-空穴对的有效分离.因而MHTO-550表现出明显优于纯锐钛矿型TiO_(2)的光催化活性.在2 mol/L KOH溶液中,MHTO-550催化还原CO_(2)至CO的产率为纯TiO_(2)的2.9倍.此外,工业用聚对苯二甲酸乙二醇酯粉末(PET)的协同氧化进一步促进光生载流子的分离,当PET用量为1.0 g时,CO的生成速率增至126.0μmoL·g^(-1)·h^(-1),是未添加PET体系中的22.7倍.同时,1H-NMR谱显示PET的氧化产物主要为乙二醛、乙醛酸、乙酸等有机物.
Mg-doped hydrogenated TiO_(2)(MHTO-550)has been prepared by heat-treatment of magnesium powder and TiO_(2) nanoparticles in H 2 atmosphere at 550℃.Compared with anatase TiO_(2),MHTO-550 exhibits significantly enhanced photocatalytic activity due to the doped Mg 2+and surface defects increase CO_(2) adsorption and promote photogenerated-carriers separation.In the 2 mol/L KOH solution,CO_(2)-to-CO conversion on MHTO-550 is about 2.9 times that on pristine TiO_(2).In particular,the synergistic of industrial PET oxidation degradation significantly improves the CO_(2) reduction.When 1.0 g PET is added,CO production rate attains 126.0μmol·g^(-1)·h^(-1),about 22.7 times that in the system without PET.1H NMR spectra indicats that PET has been oxidized into small organic molecules including glyoxal,glyoxalic acid and acetate.
作者
夏雨
刘孟平
王天龙
赵雯
田丽红
XIA Yu;LIU Mengping;WANG Tianlong;ZHAO Wen;TIAN Lihong(College of Chemistry and Chemical Engineering,Hubei University,Wuhan 430062,China)
出处
《湖北大学学报（自然科学版）》
CAS
2023年第1期82-88,共7页
Journal of Hubei University：Natural Science
