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用共沉淀法制备的类水滑石复合材料作为吸附剂去除水中的硫酸根离子.利用XRD、FT-IR、SEM和EDS元素分析对类水滑石复合材料的结构和组成进行了分析.研究了时间、p H值和共存离子对吸附量的影响.结果表明,类水滑石复合材料是锌铝硝酸根类水滑石和锌铝苯丙氨酸类水滑石的复合材料;类水滑石复合材料对硫酸根离子具有良好的吸附性能,最大吸附量可达到52.75 mg·g~(-1);准二级动力学模型对数据的拟合效果最好,说明吸附速率是由化学吸附控制的;吸附过程更符合Freundlich吸附等温模型,说明类水滑石复合材料对硫酸根离子的吸附是多层吸附;热力学参数表明在常温下吸附过程是自发的吸热过程;类水滑石复合材料吸附硫酸根离子主要是通过离子交换、静电引力作用以及物理吸附的途径来实现的.实验结果表明,该类水滑石复合材料是一种潜在的去除水中硫酸根离子的吸附剂.
The hydrotalcite-like composite prepared by coprecipitation method was used as adsorbent to remove sulfate ion in water.The structure and composition of hydrotalcite-like composites were analyzed by XRD, FT-IR, SEM and EDS elemental analysis. , P H value and coexisting ions on the adsorption capacity.The results show that the hydrotalcite-like composite is a composite material of zinc-aluminum nitrate and hydrotalcite, and hydrotalcite- The maximum adsorption capacity of the ions was 52.75 mg · g -1. The quasi-second-order kinetic model had the best fitting effect on the data, indicating that the adsorption rate was controlled by chemisorption. The adsorption process Which is more in line with the Freundlich adsorption isotherm model, indicating that the adsorption of the hydrotalcite-like composite on the sulfate ion is multi-layer adsorption; the thermodynamic parameters indicate that the adsorption process is a spontaneous endothermic process at room temperature; the adsorption of sulfate ions on the hydrotalcite- Through the way of ion exchange, electrostatic attraction and physical adsorption.Experimental results show that this kind of hydrotalcite composite is a potential method to remove sulfate ion in water Adsorbent.