Preparation of interconnected mesoporous hollow carbon spheres and their application in capacitive deionization(CDI)technology
Using the pore structure of the hollow carbon spheres as the object,an interconnected mesoporous hollow carbon spheres(MHCSs)were successfully synthesized by the modified Stöber method and used as the electrode materials.The effects of the mesoporous structure on the electrochemical and capacitive deionization properties of it were systematically investigated.The results show that comparing with the interconnected hollow carbon spheres(HCSs),which are dominated by microporous structures,MHCSs have larger specific surface area and more active sites thus the specific capacitance of the electrode materials is improved.The large pore size enhances the ion transport rate of the hollow carbon spheres,while the increment of the graphitization increases the electrical conductivity of the electrode materials.As a result,the capacitive deionization performance of the materials is significantly enhanced.The electrochemical adsorption capacities of HCSs and MHCSs reaches 10.01 and 17.81 mg·g-1 in 100 mg·L-1 NaCl solution,respectively,and the MHCSs demonstrates excellent capacitive deionization performance.In addition,after 30 adsorption-desorption cycles,the MHCSs maintain 97.42％of the initial desalination capacity in 100 mg·L-1 NaCl solution,exhibiting good cycling stability.This result provides a useful reference for the application of the mesoporous hollow carbon spheres in the field of seawater desalination and water treatment.
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