Preparation Of Magnetic Durian Shell Activated Carbon And Research On Its Adsorption Performance

The antibiotics and dyes remaining in the water body have seriously harmed the ecological environment.They are very harmful and have a wide range of pollution.So,solving them is a very urgent problem.The activated carbon adsorption method has the advantages of simple operation,flexible design and low cost,and is an economical and effective method for treating these effluent waters.Durian shell is a kind of domestic waste,its main components include lignin,cellulose,hemicellulose and pectin,which is an excellent raw material for biomass adsorbent.The activated carbon prepared from durian shell is rich in oxygen-rich groups on the surface and has a large specific surface area.Using its surface high-active groups to load Fe₃O₄ nanoparticles increases the mesoporous structure and has magnetic properties,enhances the adsorption capacity of macromolecular pollutants and facilitates Separation and recycling in wastewater.In this research paper,durian shell based on domestic waste was used as the raw material for biomass charcoal,and durian shell-based activated carbon was prepared by using phosphoric acid activation and microwave carbonization.After that,the solvothermal method was used as a magnetic means to load ferro ferric oxide on the surface of activated carbon to prepare magnetic durian shell-based activated carbon.Finally,the adsorption performance of magnetic durian shell-based activated carbon for rhodamine B and amoxicillin was investigated,and the adsorption mechanism was explored.The research contents are as follows:（1）Through orthogonal experiment and extreme analysis of iodine adsorption value and methylene blue adsorption capacity,it is determined that the optimal preparation conditions of durian shell activated carbon are:microwave carbonization power 700 W,phosphoric acid and durian shell material liquid ratio 5 g/15 m L,phosphoric acid concentration 50%,microwave carbonization time 10 min;the prepared durian shell-based activated carbon was magnetized by solvothermal method.The prepared magnetic durian shell-based activated carbon had a specific surface area of 470 m²/g and a total specific pore volume of 0.476 cm³/g.（2）The magnetic durian shell-based activated carbon was characterized by SEM,FTIR,BET and XRD.Durian shell activated carbon and magnetic durian shell-based activated carbon have a large number of oxygen-containing groups on the surface;ferro ferric oxide is spherical,and it is combined with the C-O bond on the surface of durian shell and activated carbon through C-O-Fe bond,and it adheres to the surface of activated carbon from durian shell to form irregular composite particles;the pore structure of the durian shell-based activated carbon loaded with ferro ferric oxide changed,and the microporous structure became a microporous-mesoporous structure.（3）The best adsorption conditions for rhodamine B and amoxicillin on magnetic durian shell-based activated carbon were obtained through single factor experiments.initial concentration of solution 100 mg/L and the adsorption capacity is up to 189.4mg/g;when the initial concentration of the solution is 400 mg/L,the maximum adsorption capacity can reach 308.6 mg/g.（4）The adsorption process of rhodamine B and amoxicillin on magnetic durian shell-based activated carbon conforms to the pseudo-second-order kinetic model and Langmuir adsorption isotherm model,the adsorption reaction is monolayer surface adsorption,according to the calculation of adsorption thermodynamics,and increasing the temperature is conducive to the progress of the reaction.