Study On Adsorption Of Four Hydrotalcite Materials For Heavy Mental

Nowadays heavy metal pollution problem is of an increasing importance.To solve this problem,hydrotalcite materials have been widely studied due to their unique properties and high adsorption.This article focuses on the effect of different structures of intercalated hydrotalcite materials on the removal of heavy metal ions.Layered double hydroxides?LDHs?possess extraordinary ion-exchange characteristics.Therefore,in this study we prepared Fe-LDHs?Fe-CO3,Fe-NO3,Fe-S5 and Fe-MoS4?and applied them to capture heavy metals.Then the most effective material?Fe-MoS4?was selected to apply for real waste water,which confirmed it's a great material for the adsorption of heavy metals.And we also prepared MoS4 LDHs?LaMgAl-MoS4,MgAl-MoS4,ZnMgAl-MoS4,FeMgAl-MoS4?and applied them to capture heavy metals to analysis the complexation mechanism.The research content and main results are as follows:?1?Fe-LDHs with interlayer anions of CO₃^2-,NO₃^2-,S₅^2-,and MoS₄^2-were synthesized by the hydrothermal reaction method of HMT.The effectivity order of four materials is:Fe-CO3^Fe-NO3<Fe-S5<Fe-MoS4.?2?The adsorption mechanism on Fe-LDHs?Fe-CO3,Fe-NO3,Fe-S5 and Fe-MoS4?can be well described with Langmuir model and follows a pseudo-second-order kinetics model\with correlation coefficient R²>0.99.?3?The variable chemistry of wastewater has no influence on the removal efficiency of Fe-MoS4 and thus recommended it to be a promising materials for decontamination of heavy metals from complex chemical environment including hard,saline or wastewater with high organic content.?4?The effectivity order of MoS4 LDHs is:LaMgAl-MoS4>MgAl-MoS4>ZnMgAl-MoS4>FeMgAl-MoS4;and the adsorption capacity of LaMgAl-MoS4 on Hg²⁺is710.8mg/g...