包埋磷酸盐小球的合成及其对溶液中铅镉的吸附与固定（英文）
发布时间：2018-11-13 07:45
【摘要】：采用海藻酸钠、磷酸二氢钙和碳酸氢钠成功合成了包埋磷酸盐的海藻酸钙小球。通过扫描电镜、傅里叶变换红外光谱、X射线衍射等分析表征了该小球的形貌与结构。研究p H值和初始金属离子浓度对铅镉去除率的影响,发现吸附铅镉的最佳p H值分别为4.0和5.5;铅镉的最适初始浓度分别为200 mg/L和25 mg/L,对应的去除率分别达94.2%和80%。XRD和FTIR的分析结果证实了该小球对铅镉的去除机理为:铅镉离子吸附到小球的表面,与小球的羧基发生反应,进而与磷酸根反应生成稳定的磷酸盐沉淀。铅镉的吸附符合Langmuir等温线方程,拟合系数R2分别为0.9957和0.988。根据Langmuir等温线方程计算得到铅镉的理论饱和吸附量分别为263.16mg/g和82.64 mg/g。研究结果表明该小球对溶液中的铅镉离子有良好的处理效果,同时由于生成稳定的沉淀物,也能应用于处理被铅镉污染的水稻土。
[Abstract]:Calcium alginate beads embedded in phosphate were successfully synthesized by using sodium alginate, calcium dihydrogen phosphate and sodium bicarbonate. The morphology and structure of the sphere were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. The effects of pH value and initial metal ion concentration on the removal efficiency of lead and cadmium were studied. The results showed that the optimum pH values of Pb and CD adsorption were 4.0 and 5.5 respectively. The optimum initial concentrations of lead and cadmium were 94.2% for 200 mg/L and 94.2% for 25 mg/L, respectively, and the results of 80%.XRD and FTIR showed that the removal mechanism of lead and cadmium ions was as follows: lead and cadmium ions adsorbed on the surface of the pellets. It reacts with the carboxyl group of the pellet and then reacts with the phosphate radical to form a stable phosphate precipitation. The adsorption of lead and cadmium conforms to the Langmuir isotherm equation, and the fitting coefficients R2 are 0.9957 and 0.988 respectively. According to the Langmuir isotherm equation, the theoretical saturated adsorption capacity of lead and cadmium is calculated to be 263.16mg/g and 82.64 mg/g., respectively. The results show that the pellet has a good effect on the treatment of lead and cadmium ions in the solution, and it can also be used in the treatment of paddy soil contaminated by lead and cadmium because of the formation of stable sediment.
【作者单位】： 中南大学冶金与环境学院;中南大学国家重金属污染防治工程技术研究中心;
【基金】：Project(51504299)supported by the National Science Found for Young Scientists of China Project(2012GS430101)supported by the National Science and Technology Program for Public Wellbeing,China
【分类号】：X703;TQ424
，
本文编号：2328465
[Abstract]:Calcium alginate beads embedded in phosphate were successfully synthesized by using sodium alginate, calcium dihydrogen phosphate and sodium bicarbonate. The morphology and structure of the sphere were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. The effects of pH value and initial metal ion concentration on the removal efficiency of lead and cadmium were studied. The results showed that the optimum pH values of Pb and CD adsorption were 4.0 and 5.5 respectively. The optimum initial concentrations of lead and cadmium were 94.2% for 200 mg/L and 94.2% for 25 mg/L, respectively, and the results of 80%.XRD and FTIR showed that the removal mechanism of lead and cadmium ions was as follows: lead and cadmium ions adsorbed on the surface of the pellets. It reacts with the carboxyl group of the pellet and then reacts with the phosphate radical to form a stable phosphate precipitation. The adsorption of lead and cadmium conforms to the Langmuir isotherm equation, and the fitting coefficients R2 are 0.9957 and 0.988 respectively. According to the Langmuir isotherm equation, the theoretical saturated adsorption capacity of lead and cadmium is calculated to be 263.16mg/g and 82.64 mg/g., respectively. The results show that the pellet has a good effect on the treatment of lead and cadmium ions in the solution, and it can also be used in the treatment of paddy soil contaminated by lead and cadmium because of the formation of stable sediment.
【作者单位】： 中南大学冶金与环境学院;中南大学国家重金属污染防治工程技术研究中心;
【基金】：Project(51504299)supported by the National Science Found for Young Scientists of China Project(2012GS430101)supported by the National Science and Technology Program for Public Wellbeing,China
【分类号】：X703;TQ424
，
本文编号：2328465
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