氨基酸类水滑石复合材料吸附去除水中硫酸根离子的性能

摘要

采用pH值恒定的低饱和共沉淀法制备两种含有不同性质氨基酸的类水滑石复合材料作为吸附剂去除水中的SO42-.利用XRD、FT-IR、SEM和EDS的表征手段对吸附剂的组成、表面形态、结构进行分析.研究了不同影响因素对吸附剂吸附性能的影响.试验结果表明,制备的材料是锌铝硝酸根类水滑石和锌铝氨基酸类水滑石的复合材料;氨基酸类水滑石复合材料对SO42-具有较好的吸附性能,Glu-HTlcs(谷氨酸硝酸根锌铝类水滑石复合材料)和His-HTlcs(组氨酸硝酸根锌铝类水滑石复合材料)对硫酸根离子的吸附量分别为48.94 mg/g和31.11 mg/g,时间、pH值和SO42-初始浓度对SO42-吸附量有较大的影响.氨基酸类水滑石复合材料吸附SO42-主要是通过离子交换作用,静电引力作用以及物理吸附来实现的.%Two kinds of hydrotalcite-like composites containing two different amino acids were synthetized by co-precipitation method in this research.The hydrotalcite-like composites were respectively used as adsorbents to remove sulfate ion in aqueous solution.XRD,FT-IR,SEM and EDS elemental analysis were used to determine composition,surface morphology and structure of adsorbents.The different influence factors were studied to assess the adsorption performance.The experiment results showed the material was composites of zinc aluminum nitrate hydrotalcite-like compounds and zinc aluminum amino acid hydrotalcite-like compounds.Amino acid hydrotalcite-like composites showed good performance on sulfate ion adsorption.The adsorption capacity of Glu-HTlcs and His-HTlcs were respectively 48.94 mg/g and 31.11 mg/g.Time,pH value and initial concentration of sulfate ion had large impact on adsorption capacity.Amino acid hydrotalcite-like composites adsorbed sulfate ion mainly through ion exchange,electrostatic force and physical adsorption.