摘要
首先通过水热法合成了Fe掺杂ZnO(ZnFeO)花状微球,然后采用物理沉积法将Mn掺杂碳量子点(Mn-CQDs)均匀负载于ZnFeO表面,成功构筑了Mn-CQDs/ZnFeO异质结复合材料。结合粉末X射线衍射、扫描电子显微镜、透射电子显微镜、X射线光电子能谱、紫外可见漫反射光谱和N2脱附-吸附分析,探究了该材料结构与光催化性能的关系。结果表明,Mn掺杂显著提升了CQDs的光吸收范围和荧光稳定性;Mn和Fe双掺杂协同拓展了Mn-CQDs/ZnFeO的可见光吸收边,提高了吸收强度,促进了界面光生电子-空穴对的分离,改善了光催化性能。氙灯光照80 min时,复合材料对甲基橙(MO)的降解率达到91.4%,经过4次循环实验后,降解率仍保持在80.7%。自由基捕获实验证实,光生空穴(h+)和超氧自由基(·O_(2)^(-))是MO光降解过程中的主要活性物种。
Flower-like Fe-doped ZnO(ZnFeO)microspheres were synthesized via a hydrothermal method,and Mn-doped carbon quantum dots(Mn-CQDs)were uniformly loaded onto the surface of ZnFeO through physical deposi-tion,successfully constructing Mn-CQDs/ZnFeO heterojunction composites.The relationship between the structure and photocatalytic performance of Mn-CQDs/ZnFeO was investigated using X-ray powder diffraction(XRD),scan-ning electron microscope(SEM),transmission electron microscope(TEM),X-ray photoelectron spectroscopy(XPS),ultraviolet visible diffuse reflection spectroscopy(UV-Vis DRS),and N2 adsorption-desorption analysis.The results showed that Mn doping significantly enhanced the light absorption range and photoluminescence(PL)stability of CQDs.The synergistic interaction between Mn-doped CQDs and Fe-doped ZnO extended the visible-light absorp-tion edge of Mn-CQDs/ZnFeO,improved absorption intensity,and promoted the separation of photogenerated elec-tron(e-)-hole(h+)pairs between the interfaces of heterojunction,leading to enhanced photocatalytic performance.Under xenon lamp irradiation for 80 min,the degradation rate of methyl orange(MO)reached 91.4%,and remained at 80.7%after four consecutive cycles over Mn-CQDs/ZnFeO heterojunction.The radical capture experiment con-firmed that the main active species that participated in MO degradation were both the photogenerated h+and super-oxide radical(·O_(2)^(-)).
作者
汪潼
钟秦粤
黄琼
郭为民
刘新梅
WANG Tong;ZHONG Qinyue;HUANG Qiong;GUO Weimin;LIU Xinmei(School of Biological and Chemical Engineering,Guangxi University of Science and Technology,Liuzhou,Guangxi 545005,China)
出处
《无机化学学报》
北大核心
2025年第8期1589-1600,共12页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.21261003)资助。
关键词
锰掺杂
碳量子点
Fe掺杂ZnO
异质结
光催化
manganese-doped
carbon quantum dots
Fe-doped ZnO
heterojunction
photocatalysis
