Development of Porous Character in Tamarind Wood Derived Charcoal by Microwave-Assisted Sodium Chloride Activation for Methylene Blue Adsorption

Activated carbon preparation from tamarind wood derived charcoal by microwave-assisted sodium chloride activation was studied to investigate the effects of ۰-۵ wt.% NaCl and ۴۵۰-۸۵۰ W microwave heating power.  The properties of the derived products were analyzed by FTIR, XRD, SEM-EDS, and BET. Methylene blue adsorption by the activated carbon products was also studied to evaluate the contract time, pH, methylene blue concentration, and adsorption isotherms. The study’s results showed that the percent yields (۷۷.۴۲-۹۲.۵۲%) of the fabricated activated carbons decrease with increasing wt.% of NaCl and MP. On the other hand, the contents of disordered graphitic carbon, carbonate, basic surface functional groups, and mesopores increased. However, ۳ wt.% NaCl and ۶۰۰ W microwave irradiation power were identified as appropriate conditions for activation, which created the micro-mesopore (pore size range ۱.۵۹ -۱۴.۷۶ nm) on the surface of the derived activated carbon products. Optimal values of equilibrium time and pH for methylene blue adsorption are ۶۰ minutes and ۸, respectively.  The results of methylene blue concentrations were fitted to the Langmuir isotherm indicating ۳۳.۳۳ mg/g as the maximum methylene blue adsorption capacity.

کلیدواژه ها:

tamarind wood charcoal ، activated carbon ، sodium chloride ، methylene blue ، Microwave irradiation