Adsorption Analysis Of Carbon Microspheres Using Starch As Carbon Source In Industrial Water Treatment Wastewater

The amount of industrial waste water is increasing year by year,and the composition of waste water is becoming increasingly complex,and the difficulty of treatment continues to increase.Faced with the serious shortage of available fresh water per capita in China,further improving the harmless treatment and reuse of industrial wastewater has become a necessary prerequisite for achieving sustainable development.Among them,the important treatment process in industrial wastewater treatment is adsorption.At present,there are some problems in the effect and price of the more widely used coagulants and flocculants.Therefore,it is necessary to develop adsorbents with good adsorption effects and low prices.Carbon materials are cheap and easy to obtain due to their large surface area.It has good adsorption effect and is widely used for the adsorption of organic dyes such as methyl blue.This paper uses the synthesized hollow carbon microspheres rich in mesopores as the adsorbent for methyl blue,and the special hollow multi-stage carbon microspheres Pore structure to achieve faster adsorption of methyl blue,and to study the kinetics and thermodynamic models of the adsorption process,to provide theoretical support for the application of such materials.1.Using starch as raw material,hollow carbon microspheres synthesized with the assistance of potassium carbonate,potassium bicarbonate and calcium carbonate.The synthesized carbon microspheres were characterized by SEM,TEM,BET,XPS and IR.The results show that the carbon microspheres are hollow,with an average particle size of about 24.09 nm,a specific surface area of 517.46 m² g^-1,a multi-level pore structure composed of a large number of micropores and a certain amount of mesopores,and are rich in oxygen functional groups.2.The carbon microspheres are used to adsorb methyl blue wastewater,and the adsorption effect of porous carbon microspheres on methyl blue wastewater is explored.The results show that the adsorption rate is very fast at the initial stage of adsorption,and the adsorption equilibrium is reached for about 20 minutes.The p H value and the amount of adsorbent have the most significant influence on the adsorption capacity of carbon microspheres to adsorb methyl blue.The fitting results of the quasi-first-order kinetic model and quasi-second-order kinetic model of the adsorption data show that the adsorption process conforms to the quasi-second-order kinetic model.The fitting results of the thermodynamic model show that Langmuir monolayer adsorption can describe the process of the adsorption of methyl blue by porous carbon microspheres.From this model,it can be inferred that the maximum saturated adsorption capacity of the monolayer of methyl blue is 122.4 mg/g.At the same time,the Gibbs free energy of the porous carbon microspheres for methylene blue adsorption?G=-6.02?-4.433 k J/mol,indicating that the adsorption process of the porous carbon microspheres for methylene blue is a Self-heating process.