Adsorption performance and mechanistic study of Pb,Cd and As by CaAl-LDH in wastewater
Heavy metal composite pollution is becoming increasingly serious.In this study,CaAl-layered double hydroxide(CaAl-LDH)was prepared using the facile co-precipitating method,and was characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),fourier transform infrared(FTIR)spectroscopy and X-ray photoelectron spectroscopy(XPS).Lead(II),Cd(II),and As(V)were selected as the representative heavy metals to evaluate the adsorption capability of the synthesized CaAl-LDH by the batch experiments.The maximal adsorption capability of CaAl-LDH for Pb(II),Cd(II),and As(V)was 786.6,437.2 and 72.9 mg/g,respectively.The adsorption mechanism of Pb,Cd and As may be surface precipitation,isomorphic substitution and ion exchange within the interlayer spaces of LDH,respectively.In conclusion,this experiment provides a LDH material with fast and efficient adsorption performance for both anionic and cationic metals,indicating its potential for practical application in the remediation of heavy metal composite pollution.
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