Removal of Reactive Black ۵ dye from Aqueous Solutions by Adsorption onto Activated Carbon of Grape Seed

Background and purpose: The control of environmental pollution especially the pollution of water resources is one of the main challenges of researchers throughout the world. So, this study aimed to investigate the efficiency of reactive black ۵ dye removal from aqueous solutions by adsorption onto activated carbon of grape seed. Materials and Methods: At first, the grape seed adsorbents were prepared in three forms of raw, treated by concentrated phosphoric acid, and calcined at ۴۰۰, ۶۰۰, and ۸۰۰ °C. Then, the efficiency of adsorbents to the removal of the Black ۵ dye was studied in the concentrations of ۱۰۰ to ۷۰۰ mg/Lat pH ۲- ۱۰ and ۱- ۱۰ g/L of adsorbent during ۱۲۰ min. The change of concentration was studied via the spectrophotometry procedure at the wavelength of ۵۹۷ nm. Finally, the Langmuir and Freundlich adsorption isotherm was determined. Results: The results showed that the dye removal efficiency decreased by increasing pH, and increased by raising the contact time and the amount of adsorbent. So, in this process, the highest percentage of Black ۵ dye removal (۸۳.۰۸%) was obtained at pH ۲ and t ۱۲۰ min using the raw adsorbent, ۲۰۰ mg/L initial concentration of dye, and ۱۰ g/L of carbon. The process considerably followed the Langmuir adsorption isotherm (R۲ ۰.۹۹۹). Conclusion: The grape seed was found to have the highest level of efficiency in dye removal, and according to the availability of adsorbent and its low price, this method could be used as an applicable procedure for the removal of Black ۵ dye from aqueous solutions.

کلیدواژه ها:

React Black ۵ ، Dye Removal ، Grape seed ، Adsorption ، Activated carbon