制备方法对铜镁铝类水滑石吸附性能的影响

为了考察制备方法对水滑石结晶形态及吸附性能的影响，同时解决吸附剂再生困难且易产生二次污染的问题，分别采用共沉淀法和水热法合成具有光催化作用的Cu-Mg-Al类水滑石，通过X射线衍射(XRD)、扫描电镜(SEM)、傅里叶变换红外光谱(FTIR) 等方法对制备的材料进行了表征，考察了其对盐酸四环素(TC)的吸附性能，吸附饱和的类水滑石采用紫外光照再生。结果表明，共沉淀法合成的LDHs-C吸附性能优于水热法合成的LDHs-H，对TC的去除率分别为95.2%和75.2%。Cu-Mg-Al类水滑石吸附TC的过程均符合准二级动力学方程和Langmuir吸附等温模型。吸附饱和的吸附剂在紫外线照射下30 min即可实现再生，经4次循环后，LDHs-C对TC的吸附量仍能保持原有的90%以上。

Effect of preparation method on adsorption properties of Cu-Mg-Al hydrotalcite-like compounds

In order to investigate the influence of synthesis methods on the crystal morphology and adsorption performance of hydrotalcite, and solve the problem of difficult regeneration of adsorbent and easily causing secondary pollution, Cu-Mg-Al hydrotalcite-like compounds (LDHs) with photocatalysis were synthesized by the coprecipitation method and the hydrothermal method, respectively, and the prepared materials were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and other methods, the adsorption of tetracycline hydrochloride (TC) was investigated. The saturated hydrotalcite -like compounds were regenerated under UV light. The results show that the adsorption performance of LDHs-C synthesized by the coprecipitation method was better than that of LDHs-H synthesized by the hydrothermal method, their removal rates of TC were 95.2% and 75.2%, respectively. The adsorption process of Cu-Mg-Al hydrotalcite-like compounds conformed to the quasi second order kinetic equation and Langmuir adsorption isotherm model. The saturated adsorbent could be regenerated by 30min UV irradiation. After 4 cycles, the adsorption capacity of TC on LDHs-C could still maintain over 90% of the original.