چكيده به لاتين
Porous carbon as one of the most widely used carbon structures and one of the most attractive research fields for researchers. The most important application of porous carbon is in battery electrodes, supercapacitors, as well as capacitive ionization (CDI) and absorption of pollution from the aquatic environment. Activated carbon is usually produced from biomass pyrolysis and activated in both physical and chemical ways. In this study, Azolla biomass was used as a carbon precursor and the two compounds ZnCl2 and NaOH used as chemical activation agents. Also, in order to investigate the effect of the synthesis method on the structure for ZnCl2 activator solution, milling, milling-solution and milling-solution-acid methods were selected for mixing the activator and the precursor, and then pyrolysis at 700 ° C. In the case of NaOH activator, only the precursor and activator dry mixing method was performed by ceramic mortar, acid washing and pyrolysis at 600 and 800 ° C. After synthesis of carbon samples X-ray diffraction (XRD), Fourier spectroscopy (FTIR), TGA-DTA, TEM, HRTEM, FESEM, SEM, Raman spectroscopy, Nitrogen adsorption and desorption (BET) and Methylene blue adsorption were evaluated for investigate the Surface structure and properties. After analysis, it was found that the sample produced by solution method and ZnCl2 activation agents (CS7) and the sample is washed with acid and Pyrolyzed at 600 and 800 ° C for NaOH activator (T368) had the highest specific surface (1460 m2 / g for CS7 sample) And (1437 m2/g for T368 sample). Also, the CS7 sample structure has higher porosity volume than the T368 sample and the porosity structure is more hierarchical than the T368 sample. By analyzing the methylene blue adsorption test results, the adsorption capacity of CS7 sample was about 2349 mg / g and T368 sample was about 1437 mg / g. This is due to the lower adsorption capacity of sample T368 due to differences in the type and amount of surface agents and interaction with methylene blue and also explained the difference in the structure and size distribution of the pores. Also, by peruse the structure of CS7 sample after methylene blue adsorption it is found that the graphite structure of this sample is subjected to compressive stress.
