山竹壳基活性炭的制备及性能研究

Study on Preparation and Properties of Mangosteen Shell-based Activated Carbon

以山竹壳作为原料,KOH、K2CO3、NaOH和Na2CO3为活化剂,采用化学活化法制备山竹壳基活性炭。用傅里叶变换红外光谱(FTIR)和扫描电子显微镜(SEM)表征山竹壳基活性炭。按照国标方法测定不同活化剂制备的活性炭吸附值,通过循环伏安法、恒流充放电和电化学阻抗谱考察其电化学性能。结果表明,以KOH为活化剂制备的活性炭性能最好,其碘吸附值为1 657 mg/g;在3 mol/L KOH电解液中,电流密度为10 A/g时,比电容为198 F/g;在电流密度为5 A/g时进行2 000 s恒流充放电测试,比电容保持达到90%以上。说明活化剂有助于改善所制备的活性炭的性能,且碱性越强,活化效果越好。

Mangosteen shell-based activated carbon was prepared with KOH,K2CO3,NaOH and Na2CO3 as activators.Fourier transform infrared spectroscopy(FTIR)and scanning electron microscope(SEM)were used to characterize mangosteen shell-based activated carbon.The adsorption values of activated carbon prepared by different activators were determined according to the national standard method.The electrochemical properties of activated carbon were investigated by cyclic voltammetry,constant current charge and discharge and electrochemical impedance spectroscopy.The results showed that the activated carbon prepared with KOH as activator had the best performance.Its iodine adsorption value was 1657 mg/g.In 3 mol/L KOH electrolyte,the specific capacitance was 198 F/g when the current density was 10 A/g.The specific capacitance remained above 90%when the current density was 5 A/g and the constant current charge-discharge test of 2000 s was carried out.Activation agent is helpful to improve the properties of the prepared activated carbon,the stronger the alkalinity,the better the activation effect.