Preparation of EDTA-LDH/Zeolite and Its Adsorption of Heavy Metal Ions
EDTA-LDH/zeolite composite material was synthesized in two steps by hydrothermal and reconstruction method and used for the removal of Cd2+,Pb2+,and Cu2+from aqueous solution.The adsorption effect and mechanism of EDTA-LDH/zeolite on Cd2+,Pb2+and Cu2+in single and mixed heavy metal ion solutions under different conditions were systematically investigated.The results show that the best adsorption performance of EDTA-LDH/zeolite is achieved when the dosage of EDTA-LDH/zeolite is 0.05 g,the concentration of heavy metal ions is 1 500 mg/L,the pH value is 6.5,and the adsorption time is 24 h.Competing adsorption between heavy metal ions,the maximum adsorption capacities of EDTA-LDH/zeolite for Cd2+,Pb2+,and Cu2+are 65.33,98.35,and 108.51 mg/g,respectively.During the removal process,various mechanisms such as precipitation,surface complexation,and chelation work synergistically.The removal behavior of EDTA-LDH/zeolite are all consistent with Langmuir isotherm model and pseudo second-order kinetic model.
LDHzeoliteEDTAheavy metal ionadsorption performance
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