Study On The Functionalization Of Graphene Oxide And Its Adsorption Performance For Cu(Ⅱ)and Dye

Water is an indispensable resource for people’s lives.However,with economic development,pollution is continuously being discharged into the water body,and environmental problems become serious.Various polluted wastewater is directly or indirectly discharged into the water environment,especially heavy metal wastewater.As well as dye wastewater,this phenomenon is especially obvious in developing countries.The adsorption method has been proven to be an efficient and economical treatment method,and experts and scholars are constantly exploring new adsorbents to realize the treatment of polluted water bodies.Graphene oxide（GO）has become a research hotspot due to its excellent structural characteristics.However,in order to improve the various excellent properties of the adsorbent,scholars have modified and prepared various composite materials on this basis,and achieved better results.Therefore,the purpose of this paper is also to explore modified GO materials with better effects and higher stability.Graphene oxide（GO）was successfully prepared by the blending method,and on this basis,graphene oxide-EDTA,oxide Graphene@ZIF-8 nanomaterials and magnetic graphene oxide@HA composite materials,the main research content of this subject has the following aspects:Successfully prepared graphene oxide and graphene oxide-EDTA,and used them as adsorption materials to treat simulated copper-containing wastewater.Different influencing factors are studied.The results show that the graphene oxide-EDTA composite material can effectively remove copper ions.When the beaker environment is 35℃and the initial copper ion concentration is 40 mg·L^-1,graphene oxide has the best adsorption effect on Cu²⁺in the solution,and The actual adsorption capacity in this experiment is 10.74mg·g^-1.When the temperature is 35℃and the initial concentration of copper ions is20 mg·L^-1,graphene oxide-EDTA has the best adsorption effect on Cu²⁺in the solution,and its adsorption capacity is 25.73 mg·g^-1.As the reaction temperature increases,the adsorption capacity of graphene oxide for Cu²⁺in the solution gradually increases,and when the temperature is 25℃,35℃,and 45℃,the adsorption capacity of graphene oxide for Cu²⁺in the solution is affected by temperature.The higher the ambient temperature of the beaker,the greater the adsorption capacity.What’s more worth mentioning is that through our experimentsthe prepared that graphene oxide is Graphene oxide is a cheap but effective adsorbent.（1）The modification of graphene oxide by MOF materials was studied,and the adsorption effect of composite materials and its influencing factors were studied.Based on the preparation of graphene oxide,ZIF-8 in the MOF material was compounded with it to prepare ZIF-8@GO with different proportions,and the copper ion adsorption experiment was carried out using the ZIF-8@GO composite material.By comparing the results of different materials,the effect is as follows:ZIF-8@GO（7.83%）>ZIF-8@GO（20.03%）>ZIF-8@GO（4.07%）>ZIF-8@GO（2.48%）,ZIF-8@GO（7.83%）has better structural performance.During preparation,ZIF-8can be attached to the surface of graphene oxide,providing more effective functional groups for adsorption and increasing the adsorption capacity for copper ions.Through exploring the optimal ratio,we found that ZIF-8@GO（7.83%）best adsorption effect,and maximum adsorption capacity.Different ratios correspond to different nano-scale morphologies and porosities,which are all determined by the content changes of graphene oxide and ZIF-8.The adsorbent has a simple preparation process,can be prepared by a single synthesis method,and has a good adsorption effect,and it has made significant progress in exploring new effective adsorbents.（2）The adsorption performance of humic acid（HA）modified graphene oxide composite material was studied,and its adsorption effect on dye wastewater and the influence of different factors on the adsorption effect were explored.The humic acid/graphene oxide composite was prepared by the co-precipitation method,and the adsorption of methylene blue by the composite was explored,and different influencing factors were explored.The results show that the magnetic graphene oxide/humic acid composite material prepared in the experiment can show good adsorption performance,and is magnetic,which is beneficial to removal from water.The beaker is at 35℃and the concentration of methylene blue is 5.0 mg·L^-1,the adsorption efficiency of the magnetic graphene oxide/humic acid composite material for methylene blue can reach 76.04%.In addition,the adsorption capacity increases as the initial concentration increases.Compared with graphene oxide,magnetic graphene oxide/humic acid exhibits better stability and is easy to remove from water.This study shows that the adsorption capacity and practicability of the synthesis of magnetic graphene oxide and humic acid for methylene blue have been further improved,which has expanded the practical application range of modified graphene oxide materials to a certain extent.