采用共沉淀法合成层状双金属氢氧化物并经过高温煅烧后形成层状双金属氧化物,用扫描电子显微镜对样品进行了表征.研究了层状双金属氧化物对硼的吸附性能,考察了溶液pH值、吸附剂用量、吸附时间、吸附温度对吸附性能的影响.实验结果表明,层状双金属氧化物对模拟废液中的硼有很好的吸附效果,当溶液pH值=9.5、吸附剂用量为0.20 g、硼初始浓度为100 mg/L、反应时间为100 min、温度为303 K时对硼的去除率为94.47%,吸附量为47.24 mg/g.等温吸附研究结果表明,Langmuir模型能更好地描述吸附过程,表明Mg/Al-LDO对硼的吸附主要发生在Mg/Al-LDO表面的活性区域,属于饱和单分子层吸附.
Mg-Al layered double hydroxides was synthesized by chemical co-precipitation method.Mg/Al layered double oxides (Mg/Al-LDO) was prepared by calcination of Mg-Al layered double hydroxides and characterized by SEM.Removal of boron by Mg/Al-LDO was investigated under the effect of pH of solution, Mg/Al-LDO dosages, contact time and adsorption temperature.The results showed that Mg/Al-LDO has very good adsorption capacity on boron in simulated wastewater.When pH of solution is 9.5, the dosage of Mg/Al-LDO is 0.2 g, initial boron concentration is 100 mg/L, the contact time is 100 min at 303 K, the removal rate and adsorption capacity reached 94.47% and 47.24 mg/g, respectively.Experimental isotherm data were well described by Langmuir model, indicating that the adsorption of boron mainly occurs in active region on the surface of Mg/Al-LD and belongs to saturated monolayer of adsorptive molecules.
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