Synthesis Of Functionalizedtwo-dimensional Nanomaterials Via Modifiedmussel Inspired Chemistry And Theirapplication In Environment

For the past few years,the problem of water pollution has intensified that can directly affect life quality and the health of people.It is extremely urgent to remove contaminants from water effectively.In this study,which is based on the flexibility and efficiency for adsorptive process that we used two kinds of nanocomposites: LDH and MoS₂ to preparate efficient absorbent.The research focus are poly functionalized and mussel inspired chemistry,under the alkaline conditions,the DOPA would be self-polymerized on the surface of nanocomposites to form a poly coating.The surface modification of the material can be the reaction platform which is provided for further functionalization.The three kinds of composite adsorption materials,MoS₂@PDA@PAM,PDOPA,PDOPA-f-LDH and LDH-PP@TA,were prepared by the polymerization of active radical polymerization on surface of the material.And then all of them were characterized by TEM,EDX,FT-IR,TGA and XPS.The adsorption test（adsorption time,adsorption temperature,initial pollutant concentration and pH of solution）were conducted under different conditions with methylene blue and Cu²⁺as pollutant models.The results show that:1)The results show the adsorption capacity of MoS₂@PDA@PAM is respectively 2.5times that of pristine MoS₂ and 1.8 times that of MoS₂@PDA in the same conditions.The optimum solution pH is observed at pH 7 and the increase of temperature is favorable for the increase of adsorption of MoS₂@PDA@PAM.The copper（II）ions adsorption kinetics by MoS₂@PDA@PAM obeys pseudo-second-order behavior.The Cu²⁺ions adsorption isotherm is fitted to the Frendlich isotherm model,inplying a multilayer adsorption mechanism.2)At room temperature,the adsorption capacity of PDOPA-f-LDH composite material to methylene blue was 101.8mg/g.Compared with pure LDH,the PDOPA-f-LDH showed5-fold increase in the adsorption capacity.The adsorption capacity of PDOPA-f-LDH composites increased with the increase of pH value.The results of kinetics show that MB adsorption onto PDOPA-f-LDH takes place according to pseudo-second-order kinetic model.It is found that the adsorption behavior of MB onto PDOPA-f-LDH fits very well with the Freundlich isotherm model than the Langmuir isotherm model.3)The LDH-PP@TA exhibited high adsorption of 41.56 mg/g,which is almost double that by LDH.The optimum pH for the Cu²⁺adsorption onto LDH-PP@TA is found to be 7,under alkaline conditions.The thermodynamic study shows that the adsorption process is spontaneous and endothermic.