通过共沉淀法将铈盐固定在介孔二氧化硅(MS)上制备了吸附剂(Ce-MS),用于有效地去除水中磷酸盐。仪器表征分析了改性对Ms表面形貌和结构的影响,吸附实验考察了吸附过程中不同条件对Ce-MS吸附性能的影响,并讨论了吸附过程中的动力学和热力学。结果表明:在25℃,吸附时间为180min,吸附剂用量为0.07g,pH范围为2—5,初始磷酸盐浓度20mg/L的条件下,Ce-MS对磷酸盐表现出优良的吸附性能。准二级动力学模型和Langmuir模型能更好地拟合磷酸盐吸附过程,最大吸附容量为22.17mg/g。
A adsorbent (Ce-MS) was prepared by fixing cerium(Ce) salt on mesoporous silica (MS) by coprecipitation method to effectively remove phosphate in water.The influence of the modification on the surface morphology and structure of MS were analyzed by the instrument characterization.The effect of different conditions on the adsorption performance of Ce-MS were investigated in the adsorption experiment,and discussed the kinetics and thermodynamics of the adsorption process.The results shown excellent adsorption performance for phosphate under 25℃,180min adsorption time,0.07g adsorbent dosage,pH range of 2～5,and the 20mg/L initial phosphate concentration.The pseudo-second-order model and the langmuir model could better fit the adsorption process,and the maximum adsorption capacity was 22.17mg/g.
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基金资助
云南省教育厅科学研究基金项目(2020J0329,2020J0327)
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