The Preparation Of New Type Graphene Gel And The Research Of Adsorption Properties

This article describes that graphene oxide is prepared by the method of improved Hummers at first,and then using the ascorbic acid reduction process to prepare the VC graphene gel and using the technology of titanium dioxide sodium alginate composition to prepare the titanium dioxide/sodium alginate composite graphene gel.And the synthetic products of morphology was characterized,phased,and structured by the technical methods such as SEM? XRD?FT–IR.We studied the influence of VC graphene gel to the adsorption properties of methylene blue,under different factor such as pH value,equilibrium adsorption time,initial concentration by static adsorption experiment.And then we analyse the influence of titanium dioxide/sodium alginate composite graphene gel to the adsorption properties of Cd²⁺ and Pb²⁺.So we determine the best conditions that the adsorption of VC graphene gel to methylene blue and the adsorption of to titanium dioxide/sodium alginate composite graphene gel to Cd²⁺ and Pb²⁺,and the we fit the adsorption isotherm and study the adsorption kinetics.?1?Static adsorption experiment results are as follows.The adsorption experiment of Pb²⁺ and Cd²⁺ shows that when the proportion of graphene oxide and titanium dioxide is 1:5,the system reaction temperature at 25 ? and the pH value is 7or 6,leading and cadmium ion absorb the best,respectively is 89.8 mg/g and 17.15mg/g.We found the adsorption effection of titanium dioxide/sodium alginate composite graphene gel to the adsorption properties of Cd²⁺ and Pb²⁺ by the method of Langmuir adsorption.Adsorption kinetics study shows that the adsorption of the titanium dioxide/sodium alginate composite graphene gel to Pb²⁺ and Cd²⁺ is more suitable for secondary dynamic model.?2?The adsorption experient of VC graphene gel to dye shows that under the indoor temperature and alkaline pH,the adsorption effect of graphene gel to dye molecules is best and the adsorption capacity is 91.3 mg/g.Langmuir is better than Freundlich when we study the adsorption effect of VC graphene gel to methylene blue.Adsorption kinetics study shows that the adsorption of VC graphene gel to methylene blue is more suitable for secondary dynamic model.