| Volatile organic compounds(VOCs)play significant impact on the environment,contributing to the formation of photochemical smog,depletion of the ozone layer,and global warming.Moreover,these compounds have genotoxic effects and are carcinogenic,which pose a direct threat to human health.Thus,it is crucial to curb VOCs emissions to protect both the environment and human well-being.Adsorption has become an increasingly popular method for efficient and cost-effective treatment processes.However,traditional adsorbents often release heat during the process,leading to safety hazards such as fires and collapses of the adsorption column.To address this,researchers are exploring alternative adsorbent materials that do not pose similar safety risks.This paper employs suspension polymerization to incorporate phase change energy storage microcapsules(36.5#MEPCMs)into polymer adsorbents via physical doping,without the need for chemical reactions.The resultant energy storage polystyrene adsorbent has the ability to store the energy released during the adsorption process.It’s adsorption capacity and temperature control performance are subsequently assessed through dynamic adsorption experiments.1.The main experimental method is the suspension polymerization,in which core-shell structure microcapsules(36.5#MEPCMs)of n-eicosane as the core material and divinylbenzene as the shell are doped into the polystyrene adsorbent to obtain an energy storage polystyrene adsorbent(36.5#MEPCMs-Ps).The optimal reaction route obtained through the experiment is as follows:the rotational speed of the stirring paddle is 150 rpm,the mass of styrene(St)is 120 g,and the mass of divinylbenzene(DVB)is 40 g The volume selected for the 500 mg/L methylene blue solution is 8 m L,and two parts of azodiisobutyronitrile(AIBN)are taken,each of which is 2.5 g.The mass of solid sodium chloride taken is 40 g,and the mass of polyvinyl alcohol(PVA)taken is 6 g.The selected pore forming agent includes toluene and n-heptane,with the dosage of 10 g and 50 g respectively.The volume of distilled water taken is 1500 m L,and the mass of 36.5#MEPCMs taken is 100 g.According to this synthesis route,36.5#MEPCMs-Ps with good sphericity and satisfactory pore structure were prepared.The material boasts a specific surface area of 141.63 m~2/g,with an average pore diameter of 0.6 nm and a high latent heat value of 17.28 J/g.2.In the laboratory,a dynamic adsorption experimental device was constructed to measure the temperature within the adsorption column.Toluene gas was the chosen adsorbent and the adsorption capacity and temperature control capabilities of various adsorbents,including polymer adsorbent,36.5#MEPCMs-Ps,5A molecular sieve and ACs,were investigated.Upon investigating the initial concentration of toluene,it is discovered that increasing the initial concentration led to a decrease in both the permeation time and the time required to reach adsorption equilibrium.This is because a higher initial concentration promotes a more efficient adsorption process.The trend of temperature changes inside the adsorption column demonstrated that36.5#MEPCMs-Ps,doped with phase change energy storage microcapsules,mitigated the temperature difference during the adsorption process as a result of heat storage in n-eicosane.This promising approach has potential for further optimization and industrial application.Exploring the operating conditions for the gas flow rate of toluene shows that as the air flow rate of toluene increases,the collision time between the toluene gas and the adsorbed material molecules will also decrease,which will interfere with the outward diffusion of the toluene gas components,thereby reducing the adsorption penetration time and the time to achieve adsorption equilibrium,and reducing the overall absorption effect.However,too small a gas flow rate can also increase equipment costs,so it is necessary to choose an appropriate gas flow rate. |
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