Abstract：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 electron
microscopy (SEM) were used to characterize the particle size, morphology and crystal form of the new adsorbents.
The results show that the average particle size of ZnAl-2 is 57.4 μm, and its morphology is more
spongy, while the average particle size of GaAl-3 is 71.7 μm with uniform morphology and thin walls. The adsorption
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 effect
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.
2023, Vol. 33 
