共沉淀法制备含Zn水滑石及光催化性能

发布时间：2018-02-13 06:19

本文关键词： 含Zn水滑石共沉淀法光催化罗丹明B　出处：《矿物学报》2017年04期 　论文类型：期刊论文

【摘要】：以共沉淀法制备Zn~(2+)和M~(3+)(M为Al、Cr、Fe)摩尔比为3:1,CO_3~(2-)为层间阴离子的含Zn水滑石(Zn_3M-CO_3-LDHs)。分别采用粉末X射线衍射(XRD)、红外光谱(FT-IR)、紫外-可见漫反射光谱(UV-Vis DRS)和热重-差热分析(TG-DTA)等技术对3种含Zn水滑石的结构和性质进行表征。结果表明合成的3种含Zn水滑石都具有碳酸根柱撑水滑石的典型层状结构,且结构规整、晶相单一。Zn_3Cr-CO_3-LDHs在可见光区域的吸收范围最宽。热稳定性顺序为Zn_3Cr-CO_3-LDHsZn_3Al-CO_3-LDHsZn_3Fe-CO_3-LDHs。测试了3种含Zn水滑石的光催化降解罗丹明B溶液性能,结果表明:3种含Zn水滑石均能有效光催化降解罗丹明B,Zn_3Cr-CO_3-LDHs光催化罗丹明B 70 min的降解率达到95.8%,光催化效果最好;Zn_3Al-CO_3-LDHs和Zn_3Fe-CO_3-LDHs的光催化降解率超过84%,光催化效果相近。动力学研究表明3种含Zn水滑石光催化降解罗丹明B过程符合一级反应动力学模型,反应速率常数大小顺序为:Zn_3Cr-CO_3-LDHsZn_3Al-CO_3-LDHsZn_3Fe-CO_3-LDHs。
[Abstract]:The preparation of Zn~ co precipitation method (2+) and M~ (3+) (M, Al, Cr, Fe) = 3:1, CO_3~ (2-) Zn containing hydrotalcite as interlayer anions (Zn_3M-CO_3-LDHs) respectively. The powder X ray diffraction (XRD), infrared spectroscopy (FT-IR), UV Vis diffuse reflectance spectra (UV-Vis DRS) and thermogravimetric analysis (TG-DTA) techniques were used to characterize the structure and properties of 3 kinds of Zn containing hydrotalcite. The results show that 3 kinds of Zn containing hydrotalcite synthesis has the typical layered structure of carbonate pillared hydrotalcites, with regular structure, single crystal phase in.Zn_3Cr-CO_3-LDHs the absorption range of the visible light region. The width of the thermal stability of the order of Zn_3Cr-CO_3-LDHsZn_3Al-CO_3-LDHsZn_3Fe-CO_3-LDHs. tested 3 Zn containing hydrotalcite photocatalytic degradation of Luo Danming B solution properties, the results show that the 3 Zn containing hydrotalcite can effectively photocatalytic degradation of Luo Danming B, Zn_3Cr-CO_3-LDHs Luo Danming B min 70 photocatalysis The degradation rate reached 95.8%, the best photocatalytic effect; photocatalytic degradation of Zn_3Al-CO_3-LDHs and Zn_3Fe-CO_3-LDHs was over 84%, the photocatalytic effect is similar. Kinetic studies showed that the 3 kinds of Zn containing hydrotalcite photocatalytic degradation of Luo Danming B process accords with the first-order kinetic model, the reaction rate constant of the size of the order: Zn_3Cr-CO_3-LDHsZn_3Al-CO_3-LDHsZn_3Fe-CO_3-LDHs.

【作者单位】：湖州师范学院材料工程系;
【基金】：浙江省自然科学基金(LY17E040001) 国家社会科学基金特别委托项目(16@ZH005)
【分类号】：O643.36;O644.1

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