摘要
通过水热法成功构建了具有Ⅱ型异质结的漂浮型EP-BiOBr/ZnFe_(2)O_(4)(EP-BFO)光催化材料.采用扫描电镜(SEM)、X射线衍射(XRD)、X射线能谱(XPS)及紫外可见漫反射光谱(UV-Vis DRS)等表征方法,分析光催化剂的形貌结构、组成元素、化学价态.结果表明,EP-BFO具有三维多孔结构、宽光谱响应(200~700nm)和优化的能带结构(Eg=2.08eV),其氧空位与异质结界面有效促进了光生载流子分离.研究了EP-BFO在可见光下对铜绿微囊藻的去除效果,探究了其去除机理.结果表明,EP-BFO在可见光下对铜绿微囊藻的去除率高达93.6%,反应速率常数(0.4191h^(-1))显著优于单组分催化剂.通过研究EP-BFO在复杂水体环境(含10mg/L腐殖酸或富里酸)的去除性能,发现其去除率仍有82%.自由基捕获实验表明,超氧自由基(·O_(2)^(-))和空穴(h^(+))为主要活性物质.同时,在光催化过程中产生的活性物质通过氧化作用导致藻细胞膜(离子泄漏、MDA积累)及光合系统(藻胆蛋白降解)的损伤.
A floating-type EP-BiOBr/ZnFe_(2)O_(4)(EP-BFO)photocatalyst with a type-II heterojunction was successfully synthesized via the hydrothermal method.Characterization techniques including SEM,XRD,XPS,and UV-Vis DRS were employed to analyze the morphology,elemental composition,and chemical valence states of the photocatalyst.Results indicate that EP-BFO exhibits a three-dimensional porous structure,broad spectral response(200~700nm),and an optimized band structure(Eg=2.08eV).Its oxygen vacancies and heterojunction interface effectively promote photogenerated charge separation.The removal efficiency of EP-BFO against Microcystis aeruginosa under visible light was investigated,along with its removal mechanism.Results demonstrated that EP-BFO achieved a removal rate of 93.6%for Microcystis aeruginosa under visible light,with a reaction rate constant(0.4191h^(-1))significantly superior to that of single-component catalysts.When tested in complex aquatic environments containing 10mg/L humic acid or fulvic acid,EP-BFO still maintained an 82%removal rate.Radical scavenging experiments indicated that superoxide radicals(·O_(2)^(-))and holes(h^(+))were the primary active species.Concurrently,the active species generated during photocatalysis caused damage to algal cell membranes(ion leakage,MDA accumulation)and photosynthetic systems(degradation of phycobiliproteins)through oxidative processes.
作者
胡磊
张东源
丁宁
刘宏
HU Lei;ZHANG Dong-yuan;DING Ning;LIU Hong(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;Department of Environmental Science and Engineering,Beijing Technology and Business University,Beijing 100048,China)
出处
《中国环境科学》
北大核心
2026年第3期1554-1567,共14页
China Environmental Science
基金
国家自然科学基金青年基金(51708381)。
