摘要
光催化技术因可以直接利用太阳能、反应条件温和、无二次污染、能降解几乎所有的有机污染物等特点,有望成为解决空气污染的理想污染治理技术。在合成g-C_(3)N_(4)纳米片的基础上,分别将还原氧化石墨烯(rGO)和AuPt双金属纳米颗粒与g-C_(3)N_(4)复合,制备出AuPt/rGO/g-C_(3)N_(4)复合光催化剂。采用XRD、Raman、TEM、XPS、DRS、PL、电化学测试等多种表征手段对光催化剂的晶体结构、形貌、电子结构、光学性质和界面性质等进行了分析,并评估了其在全谱和可见光下降解甲醛的性能。研究结果表明,AuPt/rGO/g-C_(3)N_(4)表现出优异的光催化性能和光催化稳定性,这主要归功于拓宽的可见光吸收能力、有效的光生载流子分离以及延长的光生载流子寿命。在全谱和可见光激发下,AuPt/rGO/g-C_(3)N_(4)对甲醛的降解率分别为96%(90 min)和97%(150 min),CO_(2)的转化率分别为82%和77%,相应的甲醛降解表观一级反应速率常数分别为0.0355和0.0232 min^(−1),分别是g-C_(3)N_(4)的12.5和15.5倍。
Photocatalytic technology is expected to become an ideal pollution control technology for solving air pollution due to its direct utilization of solar energy,mild reaction conditions,no secondary pollution,and ability to degrade almost all organic pollutants.On the basis of synthesizing g-C_(3)N_(4) nanosheets,reduced graphene oxide(rGO)and AuPt bimetallic nanoparticles were respectively combined with g-C_(3)N_(4) to fabricate AuPt/rGO/g-C_(3)N_(4) photocatalytic composite.The crystal structure,morphology,electronic structure,optical and interface properties of AuPt/G/g-C_(3)N_(4) were analyzed by techniques such as XRD,Raman,TEM,XPS,DRS,PL and electrochemical testing.The formaldehyde degradation performance by AuPt/rGO/g-C_(3)N_(4) was assessed under full spectra or visible light conditions.The results indicated that AuPt/rGO/g-C_(3)N_(4) exhibited excellent photocatalytic performance and stability,mainly due to its expanded visible light absorption capacity,effective separation of photogenerated carriers,and extended lifetime of photogenerated carriers.Under full spectra and visible light irradiation,the degradation rates of formaldehyde over AuPt/rGO/g-C_(3)N_(4) were 96%(90 min)and 97%(150 min),respectively.The conversion rates of CO_(2) were 82%and 77%,respectively.The corresponding apparent first-order reaction rate constants for formaldehyde degradation were 0.0355 and 0.0232 min^(−1),which were 12.5 and 15.5 times that of g-C_(3)N_(4),respectively.
作者
陈楚晓
郝京华
CHEN Chuxiao;HAO Jinghua(Hebei Vocational University of Industry and Technology,School of Architectural Engineering,Shijiazhuang 050000,China;School of Environment,Harbin Institute of Technology,Harbin 150090,China;Shijiazhuang Municipal Ecology and Environment Bureau,Shijiazhuang 050000,China)
出处
《环境工程学报》
北大核心
2025年第1期178-187,共10页
Chinese Journal of Environmental Engineering
基金
河北工业职业技术大学创新方法研究专项(cx202201)。
