以茶叶梗和溴氧化铋(BiOBr)作为主要原料,制备了茶叶梗/BiOBr复合催化剂。采用X射线衍射仪、紫外-可见漫反射光谱仪、全自动比表面积及孔隙分析仪、X射线光电子能谱仪、扫描电子显微镜等对催化剂样品进行表征与分析,探究了复合催化剂的降解效果以及对不同染料的光催化降解性能。结果表明:茶叶梗/BiOBr复合催化剂比纯BiOBr具有更好的光催化降解稳定性,且具有良好的结晶度,禁带宽度为2.66eV,比表面积为628.792m2/g;当茶叶梗与BiOBr质量比为3∶1时,茶叶梗/BiOBr复合催化剂的光催化效果最佳;投加15mg复合催化剂处理100mL质量浓度20mg/L罗丹明B溶液,在250W氙灯下照射90min,罗丹明B降解率可达94.72%。
Tea stem/BiOBr composite catalysts were prepared using tea stems and bismuth oxybromide (BiOBr) as the main raw materials.The catalyst samples were characterized and analyzed by X-ray diffraction (XRD),ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS),automatic specific surface area and porosity analyzer,X-ray photoelectron spectroscopy (XPS),and scanning electron microscopy (SEM).The degradation effects of the composite catalysts and their photocatalytic degradation performance for different dyes were investigated.The results showed that the tea stem/BiOBr composite catalyst exhibited better photocatalytic degradation stability than pure BiOBr,along with good crystallinity,an optical band gap of 2.66eV and a specific surface area of 628.792m2/g.When the mass ratio of tea stems to BiOBr was 3∶1,the tea stem/BiOBr composite catalyst achieved the optimal photocatalytic effect.When 15mg of the composite catalyst was added to treat 100mL of 20mg/L Rhodamine B solution and irradiated under a 250W xenon lamp for 90 minutes,the degradation rate of Rhodamine B reached 94.72%.
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基金资助
环境科学省级一流专业建设(SJZY-2022-02)
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