S2-插层的层状双金属氢氧化物的制备及对镉离子吸附研究

Preparation and their adsorption of cadmium ions of S2-intercalated layered double metal hydroxides

以ZnSO4、Ga(SO4)3、Al(OH)3、CH4N2O和N2S为原料,制备出S2-插层的层状双金属氢氧化物吸附剂,采用纳米激光粒度仪、X-射线衍射(XRD)和扫描电子显微镜(SEM)对新型吸附剂的粒径、形貌和晶型进行了表征。结果表明,ZnAl-2平均粒径为57.45μm,其形貌呈现较多的海绵状,GaAl-3的平均粒径为71.7μm,形貌均匀且壁较薄。4种合成的吸附剂对镉离子的吸附性能为:随着吸附时间延长,吸附效果增加,在吸附时间达到60 min时,再增加吸附时间其吸附效果增加的不明显,因此确定吸附时间为60 min。4种合成的吸附剂的吸附性能为:GaAl-3>ZnAl-2>GaAl-2>ZnAl-2。

S2-intercalated layered double metal hydroxide adsorbents were prepared by ZnSO4,Ga(SO4)3,Al(OH)3,CH4N2O and N2S as raw materials.Nano-laser particle size analyzer,X-ray diffraction(XRD)and scanning elec‐tron microscopy(SEM)were used to characterize the particle size,morphology and crystal form of the new ad‐sorbents.The results show that the average particle size of ZnAl-2 is 57.4μm,and its morphology is more spongy,while the average particle size of GaAl-3 is 71.7μm with uniform morphology and thin walls.The ad‐sorption performance of the four synthesized adsorbents for cadmium ions is as follows:with the extension of the adsorption time,the effect increases when the adsorption time reaches 60 min,the increase of the adsorption ef‐fect is not obvious when the adsorption time increases more,so the adsorption time is determined to be 60 min.The adsorption properties of the four synthesized adsorbents are:GaAl-3>ZnAl-2>GaAl-2>ZnAl-2.