Abstract:

Different layer cation CO₃^2--LDHs were prepared by co-precipitation method at the presence of different modifying agents, then it was prepared for layered double oxide(LDO) samples by calcination. Mg-Al-LDO modified with glycerol was selected as the more suitable removal agent for Cl^-. Taking the removal amount of Cl^- in the simulated wastewater as the main index, Mg-Al-LDO modified with glycerol as removal agent for Cl^-, the process conditions were investigated and the suitable condition was determined, under of which the average Cl^- removal amount was 40.218 mg/g, the average Cl^- removal rate was 75.41%. The regeneration rate of the sample was 41.48% after 4 cycles. The chloride removal process was consistent with pseudo-second-order kinetics model and Langmuir isotherm model. The results of XRD, FT-IR showed that removal of Cl^- by LDO due to the 'memory effect'.

Key words: LDHs, LDO, the removal of Cl^-

摘要：

在不同改性剂作用下，采用共沉淀法制备了不同板层阳离子的CO₃^2-型类水滑石（LDHs），并经焙烧制备了层状双金属氧化物（LDO）。经筛选确定丙三醇改性Mg-Al-LDO为较适宜的Cl^-脱除剂。以模拟废水中Cl^-脱除量为评价指标，以丙三醇改性Mg-Al-LDO为脱氯剂，考察并确定了较适宜的Cl^-脱除工艺条件，此条件下Cl^-平均脱除量为40.218 mg/g，Cl^-平均脱除率为75.41%。丙三醇改性Mg-Al-LDO 4次循环后的再生率为41.48%。丙三醇改性Mg-Al-LDO脱除Cl^-过程符合准二级动力学方程、Langmuir等温模型。结合XRD、FT-IR表征结果推测，LDO可脱除Cl^-是由于其具有"记忆效应"。

关键词: 类水滑石, 层状双金属氧化物, Cl^-脱除

CLC Number: 

• X703.1