活性氧化铝对废水中磷酸根离子的吸附特性研究

发布时间：2018-02-16 17:38

本文关键词： 活性氧化铝废水磷酸根离子吸附动力学热力学　出处：《非金属矿》2017年04期 　论文类型：期刊论文

【摘要】：通过静态吸附试验研究了活性氧化铝吸附废水中磷酸根离子的影响因素及作用机理。结果表明:对初始质量浓度为10 mg/L的磷酸根离子溶液,在活性氧化铝用量为25 g/L,pH值为4,吸附温度为298 K和吸附时间为60 min时,磷酸根离子的去除率为90.30%;活性氧化铝再生3次后,废水中磷酸根离子的去除率保持在89%左右。活性氧化铝pHpzc为4.9;当pH值为4时,磷酸根离子以H2PO4-形式存在,活性氧化铝表面带正电,有利于H2PO4-在其表面产生静电吸附。磷酸根离子在活性氧化铝表面的吸附符合二级动力学模型;等温吸附过程符合Langmuir等温吸附模型。zeta电位测试、热力学参数计算和FTIR分析表明:磷酸根离子在活性氧化铝表面的吸附为化学吸附与物理吸附共同作用。ΔG0,ΔH0,表明吸附过程为自发、吸热过程。
[Abstract]:The influence factors and mechanism of phosphate ion in activated alumina adsorption wastewater were studied by static adsorption test. The results showed that the initial mass concentration of phosphate ion solution was 10 mg/L. When the amount of active alumina was 25 g / L ~ (-1) pH = 4, adsorption temperature was 298K and adsorption time was 60 min, the removal rate of phosphate ion was 90.30%. The removal rate of phosphate ion in wastewater is about 89%. The pHpzc of activated alumina is 4.9. When pH is 4:00, the phosphate ion exists in the form of H _ 2PO _ 4-, and the surface of active alumina is positively charged. The adsorption of phosphate ion on the surface of activated alumina accords with the second-order kinetic model, and the isothermal adsorption process accords with the Langmuir isotherm adsorption model. The calculation of thermodynamic parameters and FTIR analysis show that the adsorption of phosphate ion on the surface of active alumina is a combination of chemisorption and physical adsorption, 螖 G _ 0, 螖 H _ 0, which indicates that the adsorption process is spontaneous and endothermic.
【作者单位】：贵州大学材料与冶金学院;贵州大学矿业学院;喀斯特地区优势矿产资源高效利用国家地方联合工程实验室;贵州省非金属矿产资源综合利用重点实验室;
【基金】：国家科技支撑计划资助项目(2013BAC15B01) 国家自然科学基金(51264005,51474078) 贵州省科学技术基金(黔科合JZ字[2014]2009号)
【分类号】：X754

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