球磨法制备Ag/g-C3N4复合光催化剂及其性能研究
张津语 , 吴婵 , 李文志 , 刘慧 , 李娜 , 王艳
现代化工 ›› 2026, Vol. 46 ›› Issue (6) : 163 -169.
球磨法制备Ag/g-C3N4复合光催化剂及其性能研究
Preparation of Ag/g-C3N4 composite photocatalyst by ball milling method and its performance study
以三聚氰胺与三聚氰酸为原料高温煅烧制备g-C3N4,经球磨法负载Ag制得Ag/g-C3N4复合光催化剂,改善纯 g-C3N4光生载流子高复合的缺陷。通过X射线衍射分析仪(XRD)、傅里叶变换红外光谱(FT-IR)、X射线光电子能谱仪(XPS)等表征其结构、组成与载流子分离效率,以10 mg/L甲基橙为目标污染物考察可见光催化性能,并结合自由基捕获实验探究机理。结果表明,负载Ag可拓宽g-C3N4可见光响应范围、提升载流子分离效率;Ag的摩尔比为0.5%时催化剂性能最优,光照射60 min甲基橙降解率达95%,反应速率常数为纯g-C3N4(CN)、未优化g-C3N4(CN0)的5.4倍、9.77倍,·$\mathrm{O}_{2}^{-}$和h+为关键活性物种。该研究为g-C3N4基光催化剂优化及有机废水处理应用提供实验依据。
Graphitic carbon nitride(g-C3N4) was fabricated via high-temperature calcination using melamine and cyanuric acid as the raw materials.Subsequently,the Ag/g-C3N4 composite photocatalyst was prepared by introducing silver (Ag)through a ball-milling method,aiming to mitigate the drawback of high recombination rate of photogenerated carriers in pristine g-C3N4.The structure,composition and carrier separation efficiency of the as-prepared samples were characterized by means of X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS).The visible-light-driven photocatalytic performance was evaluated using methyl orange (MO) solution with a concentration of 10 mg/L as the target pollutant,and the catalytic mechanism was further investigated via radical trapping experiments.The results demonstrated that single Ag doping could broaden the visible-light response range of g-C3N4 and enhance the separation efficiency of photogenerated carriers.The catalyst exhibited the optimal photocatalytic performance when the molar ratio of Ag was 0.5%,achieving a MO degradation rate of 95% after 60 min of visible-light irradiation.The corresponding reaction rate constant was 5.4 and 9.77 times higher than those of pristine g-C3N4 (CN) and unoptimized g-C3N4 (CN0),respectively.Moreover,superoxide anion radicals (·$\mathrm{O}_{2}^{-}$) and photogenerated holes (h+) were identified as the dominant reactive species.This study provides experimental basis for the optimization and regulation of g-C3N4-based photocatalysts,and holds theoretical guiding significance for their practical application in organic wastewater treatment.
photocatalysis / g-C3N4 / Ag / degradation / dye
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太原科技大学校级创新创业训练项目(DCX2025106)
太原科技大学国家级创新创业训练项目(DCX20250903)
国家自然科学基金(22002181)
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