采用离子交换法制得酒石酸插层 MgAl 水滑石(MgAl-TA LDHs),并进行了 XRD、IR、SEM、比表面积及孔径分析表征。考察了 MgAl-TA LDHs 吸附剂对溶液中Ni2＋的吸附能力,探讨了水滑石吸附剂投加量、Ni2＋溶液浓度、p H 值以及吸附温度对 Ni2＋吸附率的影响,并进行了动力学和热力学特征的研究。结果表明,适宜的水滑石投加量为2 g/L,p H 值以中性为宜,对于 Ni2＋浓度不超过100 mg/L 的溶液室温下Ni2＋吸附率在60％以上,而高温有利于提高 Ni2＋吸附率。吸附过程符合二级动力学模型,吸附等温曲线可用R-P模型来描述。吸附过程能够自发进行,为吸热过程,属于化学吸附。
The tartrate intercalated MgAl layered double hydroxides (MgAl-TA LDHs)was prepared by anion-exchange method.The samples prepared were characterized by XRD,FT-IR and used to uptake Ni2+ from the aqueous solutions.The effects of adsorbent dosage,initial Ni2+ concertration,pH,adsorption temperature on the Ni2+ adsorption efficiency were investigated.The characters of thermodynamics and kinetics were discussed. The results showed that the suitable adsorbent dosage was 2 g/L,and pH was neutral.Under the above contidi-tions,Ni2+ adsorption efficiency was over 60% at the Ni2+ concentration less than 100 mg/L.High temperature was beneficial to improving Ni2+ adsorption efficiency.Adsorption process conforms to the second-order kinetics model and the isothermal adsorption curve can be described by R-P model.The adsorption process was sponta-neous and endothermic,and was belonged to chemisorption.
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