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采用共沉淀法制备得到1,5-萘二磺酸根插层的镁铝类水滑石,将其应用于废水中Pb~(2+)的脱除.通过X射线衍射(XRD)、红外光谱(IR)、扫描电镜(SEM)等表征手段对所制备的粉末样品进行了结构表征.插层后的类水滑石对Pb~(2+)表现出较好的络合分离性能,容量高于110mg/g.本文系统探讨了初始pH、类水滑石的用量、接触时间、络合温度以及Pb~(2+)的初始浓度对脱除溶液中Pb~(2+)的影响.实验结果表明,反应条件对Pb~(2+)的脱除有较大的影响,类水滑石对Pb~(2+)的脱除是通过层间1,5-萘二磺酸根和表面羟基与Pb~(2+)的络合作用实现的.处理后,水溶液中残留的Pb~(2+)浓度低于0.04mg/L,这一结果符合国家地表水环境质量标准的第Ⅲ类标准(≤0.05mg/L).
The Mg-Al hydrotalcite intercalated with 1,5-naphthalenedisulfonate was prepared by co-precipitation method, which was used for the removal of Pb 2+ in waste water.The structure of Pb 2+ was studied by X-ray diffraction (XRD), infrared spectrum IR) and scanning electron microscopy (SEM) were used to characterize the prepared powder samples.The intercalated hydrotalcite showed better complexation and separation performance for Pb 2+ with the capacity higher than 110 mg / g.In this paper, the effects of the initial pH, the amount of hydrotalcite, the contact time, the complexation temperature and the initial concentration of Pb 2+ on Pb 2+ in the removal solution were systematically investigated.The experimental results show that, The reaction conditions have a great influence on the removal of Pb 2+. Hydrotalcite-like removal of Pb 2+ is achieved by interlamellar 1,5-naphthalenedisulfonate and hydroxyl groups at the surface of Pb 2+ 2+). After treatment, the concentration of residual Pb 2+ in the aqueous solution is lower than 0.04mg / L, which is in line with the national standard of surface water environmental quality standard (≤0.05mg / L).