低碳化学与化工2025，Vol.50Issue(5)：18-31,39,15.DOI:10.12434/j.issn.2097-2547.20240415
B修饰g-C3N4的制备及其光催化CO2还原
Preparation of B modified g-C3N4 and their photocatalytic CO2 reduction
摘要
Abstract
Graphitic carbon nitride(g-C3N4)is one of the ideal catalysts for photocatalytic CO2 reduction.However,the application of g-C3N4 is limited due to the rapid recombination of photogenerated carriers.The mixture of melamine and B2O3 was treated by hydrothermal method,and then a series of B-modified g-C3N4(x-B-HCN,x is the molar ratio of B2O3 and melamine)was prepared by calcining the hydrothermal reaction product.The crystal structures and functional groups of x-B-HCN were characterized by XRD and FT-IR,etc.And the photocatalytic performance and corresponding reaction mechanism of x-B-HCN for CO2 reduction to CO were studied.The results show that x-B-HCN has large specific surface area(11.8 m2/g to 24.6 m2/g),thus exhibiting strong CO2 adsorption performances.Under irradiation by 300 W xenon lamp with 400 nm cut-off filter for 5 h,0.20-B-HCN exhibits the best photocatalytic performance with CO generation rate of 6.88 μmol/(g·h),which is 5.54 times greater than that of g-C3N4(1.24 μmol/(g·h))obtained by one-step calcination method and 3.97 times greater than that of HCN-1(1.73 μmol/(g·h))without B modification.Irradiation for 5 h in the third cycle under the same conditions,the CO generation rate of 0.20-B-HCN is 6.53 μmol/(g·h),which indicates that 0.20-B-HCN has fairly high stability.The pathway of photocatalytic CO2 reduction to CO by x-B-HCN is as follows:CO2 → COOH*→ CO*→ CO.关键词
光催化/CO2还原/石墨氮化碳/B修饰Key words
photocatalytic/CO2 reduction/graphitic carbon nitride/B modification分类
化学工程引用本文复制引用
何醒丽,孙满营,苏通明..B修饰g-C3N4的制备及其光催化CO2还原[J].低碳化学与化工,2025,50(5):18-31,39,15.基金项目
国家自然科学基金(22208065) （22208065）
广西自然科学基金(2022GXNSFBA035483). （2022GXNSFBA035483）
