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以硝酸镁、硝酸铝为原料,尿素为沉淀剂,采用水热法在不同条件下合成了不同形貌的镁铝水滑石LDH-1、LDH-2、LDH-3。通过SEM、XRD、BET和EDS对合成的样品进行了表征;考察了不同形貌水滑石及其焙烧产物(LDO-1、LDO-2、LDO-3)对溶液中氯离子的吸附性能。结果表明:采用水热法添加乙二醇可合成棒状镁铝水滑石(LDH-1),添加乙醇可合成片状六边形镁铝水滑石(LDH-2),添加四丙基氢氧化铵可合成立方体镁铝水滑石(LDH-3)。其中,LDH-2形貌规整均一,片间形成交叉支撑结构,比表面积为115.311 m2/g,在室温条件下,其对氯离子的最大吸附量为24.72 mg/g。LDO-2吸附氯离子的最优操作条件:温度为35℃,pH值为8,焙烧温度为450℃。在此条件下,焙烧产物(LDO-2)吸附氯离子的能力大大增强,最大吸附量为96.07 mg/g。
Using magnesium nitrate and aluminum nitrate as raw materials and urea as precipitating agent, hydrotalcite LDH-1, LDH-2 and LDH-3 with different morphologies were synthesized under different conditions. The synthesized samples were characterized by SEM, XRD, BET and EDS. The adsorption properties of chloride ions on hydrotalcite and its calcined products (LDO-1, LDO-2, LDO-3) were investigated. The results showed that LDH-1 could be synthesized by adding ethylene glycol by hydrothermal method, LDH-2 was synthesized by adding ethanol, and tetrapropylammonium hydroxide Cubic magnesium aluminum hydrotalcite (LDH-3) can be synthesized. The morphology of LDH-2 was uniform and the cross-supports were formed. The specific surface area of LDH-2 was 115.311 m2 / g. The maximum adsorption capacity of chloride ion for LDH-2 was 24.72 mg / g at room temperature. LDO-2 adsorption of chloride ion optimum operating conditions: temperature 35 ℃, pH 8, calcination temperature of 450 ℃. Under these conditions, the ability of the calcined product (LDO-2) to adsorb chloride ions was greatly enhanced, with a maximum adsorption capacity of 96.07 mg / g.