Carbon Dioxide Adsorption and Decolourizing Power of Activated Carbons Prepared from Pistacia Shells

Abstract

A series of activated carbons ‘Z’ was prepared from Aleppo Pistacia Vera shells using different percentages of zinc chloride at 873 K in the absence of air. Another series ‘ZN’ was prepared using the same conditions as for the ‘Z’ series but employing a nitrogen atmosphere to effect carbonization. The textural properties of the two series of samples were determined from the adsorption of carbon dioxide and methylene blue at 298 K. Activated carbons with a high adsorptive capacity for methylene blue were obtained. Activation with zinc chloride proceeded with increasing microporosity via the creation of new micropores. At high percentages of zinc chloride, slight partial pore widening may take place. Carbon dioxide was accessible to the entire pore system and was therefore suitable as a probe for the investigation of the textural properties of the activated carbons studied. A fraction of the porosity was inaccessible to methylene blue molecules and consequently lower surface areas were calculated from the adsorption of this dye molecule.

Characteristics of activated carbon prepared from pistachio-nut shell by zinc chloride activation under nitrogen and vacuum conditions

“…However, the properties of the final activated carbon are also dependent on the nature of the precursor. Chemical activation using ZnCl 2 had been used for the preparation of activated carbon from pistachio-nut shell [16], but parametric studies on this raw material have not been reported. Preparation of activated carbons by chemical activation in an inert atmosphere such as nitrogen had been carried out by many researchers [7][8][9][10][11][12][13][14]; however, chemical activation under vacuum conditions during the heat-treatment process is seldom reported in the literature.…”

Effects of vacuum pyrolysis conditions on the characteristics of activated carbons derived from pistachio-nut shells

“…There are many studies in the literature relating to the preparation and characterization of activated carbons from agricultural wastes [1][2][3][4][5][6]. However, there is only limited information on the preparation of activated carbons using pistachio-nut shells [7]. To further explore the viability of using pistachio-nut shells for activated carbon production, it was selected as the starting material in this study.…”

Low-cost Adsorbents Derived from Agricultural By-products/Wastes for Enhancing Contaminant Uptakes from Wastewater: A Review

“…In this study, pistachio shells were chemically activated using ZnCl 2 as an oxidizing agent and then physically activated by CO 2 passed through water. As a result, ACs produced from pistachio shells treated with 40% ZnCl 2 and 40% HCl at room temperature and then activated at 900ºC for 90 min had higher surface areas of: (i) 3,256 m [166]. It was concluded that AC prepared from pistachio shells may be used for both gaseous and liquid adsorption applications, depending on the different activation conditions [167].…”