| In recent years,the emission of polluted wastewater,especially the organic dye wastewater,has brought serious environmental problems.Methylene blue(MB)is the most representative organic dye pollution source.Among organic wastewater treatment technologies,adsorption is the most economical and effective way.In terms of energy storage,supercapacitor is a promising energy storage element owing to its high power density and cycle stability.Therefore,the development of efficient and economical adsorbents and electrode materials become the focus of attention.In this work,porous carbon(PCM-K and P-K)has been successfully prepared by using biomass pine nut shell as a precursor.Nitrogen-doped porous carbon(PCM-K)take melamine and chitosan as nitrogen source.The as-synthesized PCM-K exhibits an ultrahigh specific surface area(3376.1 m2·g-1),a large pore volume(1.655 cm3·g-1)and a high nitrogen content of 6.25%.We experimentally explore the removal ability of PCM-K and P-K for cationic dye methylene blue(MB)in water.The maximum adsorption capacity of PCM-K reaches 766.9 mg·g-1,while it is 418.5 mg·g-1 for P-K.We also examine the influence of various experimental factors,such as contact time,initial dye concentration,adsorbent dosage and temperature on the MB removal from water.The maximum adsorption capacity of PCM-K for cationic dye rhodamine B(RhB)and the anionic dye methyl orange(MO)reach 704.3 and 408.7 mg·g-1,respectively.Owing to the high nitrogen content,the PCM-K also exhibits excellent electrochemical performance as supercapacitor electrode material.Galvanostatic charging-discharging measurements showed that the specific capacitance of PCM-K in a three-electrode system reaches 376.4 F·g-1 in 6 M KOH and at a current density of 0.1 A·g-1.The excellent dye removal and electrochemical performances showed that the biomass-derived nitrogen-doped porous carbons PCM-K is a promising candidate for wastewater treatment and energy storage. |
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