在水热反应温度为180℃,反应溶液pH值=9～10,反应时间为4h,反应总物质浓度为0.1mol/L的实验条件下,探索Mg/Al的摩尔比对MgAl-LDH吸附甲基橙性能的影响,并考察了材料再生后的吸附性能。研究结果表明,Mg/Al摩尔比为2.5∶1时的MgAl-LDH吸附甲基橙性能最优;在最佳吸附条件下,MgAl-LDH对甲基橙吸附量高达83.33mg/g;并对吸附材料循环利用焙烧温度进行探讨,可再生循环焙烧温度在400℃达到最佳,循环使用3次吸附性能保持良好。此外,对Mg/Al-LDH及其各个温度焙烧产物进行TG-DTA和SEM表征,显示其片状构型及对甲基橙进行的离子交换吸附和表面静电吸附作用。
Mg/Al-LDH was prepared by co-precipitation and hydrothermal reaction.Under the experimental conditions：hydrothermal reaction temperature was 180℃;reaction solution pH was 9-10;reaction time was 4h;concentration of the all reactants was 0.1mol/L,the effect of Mg/Al molar ratio on the methyl orange adsorption performance of MgAl-LDH was firstly investigated.Moreover,the adsorption performance of materials after regeneration was studied.The results showed that the highest methyl orange adsorption performance was best when the Mg/Al molar ratio was 2.5∶1.Under the optimum experimental conditions,a high adsorption capacity of 83.33mg/g of methyl orange on 2.5∶1 MgAl-LDH could be detected.The materials obtained can be reused after calcination at 400℃.Furthermore,the adsorption performance did not change markedly even after three cycles.In addition,in order to analyze the adsorption mechanism,the materials prepared were characterized in detail with SEM and TG-DTA techniques.
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