苹果酸辅助NH_(2)-MIL-125(Ti)合成及其光催化性能研究

NH_(2)-MIL-125(Ti)Synthesized with Malic Acid Additive and Its Photocatalytic Performance

以苹果酸为添加剂辅助合成了NH_(2)-MIL-125(Ti)光催化剂,采用X射线衍射(XRD)、扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)、紫外可见漫反射光谱(UV-vis)、光致发光光谱(PL)等手段对其进行了表征,并以光催化降解罗丹明B(RhB)反应为探针评价其性能。结果表明:少量添加苹果酸使得NH_(2)-MIL-125(Ti)晶体厚度变薄、尺寸变小;而大量添加时,NH_(2)-MIL-125(Ti)晶体尺寸变大,同时晶体错位生长,缺陷增加,提高了电子空穴分离效率和界面电荷传输效率,促进样品光降解性能,提升光催化活性,反应120 min后RhB的移除率达到83%。

NH_(2)-MIL-125(Ti)samples were synthesized with malic acid as an additive,which were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),Fourier transform infrared spectroscopy(FT-IR),ultraviolet visible spectrophotometry(UV-vis)and photoluminescence spectroscopy(PL).The photocatalytic performance of the samples was evaluated by photocatalytic degradation reaction of Rhodamine B(RhB).The results showed that a small amount of malic acid addition made the NH_(2)-MIL-125(Ti)crystals thinner and smaller,while a large amount of malic acid addition made the NH_(2)-MIL-125(Ti)crystals larger,possesses more mesopores,improved electron hole separation efficiency and interfacial charged transport efficiency,which promoted the photodegradation performance of the samples.As a result,the photocatalytic activity was improved and the removal of RhB reached 83%in 120min.