Activated Nanoporous Carbon from walnut shell as a Promising Adsorbent for Methane Storage in ANG Technology

Abstract

Activated carbon from walnut shell is studied for methane storage in this research. The samples are synthesized by zinc chloride and phosphoric acid as activating agents. The e ect of physical activation, after chemical activation steps, on the nal structure of the samples and their total methane storage is examined. The results show that physical activation has an improving e ect on the total capacity of the samples activated by phosphoric acid; however, it has the opposite e ect on the capacity of the samples activated by zinc chloride. The experimental data show that the best capacity is obtained at impregnation ratios of 0.7 and 1.2 in the case of phosphoric acid and zinc chloride activated samples, respectively. The best sample is the one activated by phosphoric acid with an impregnation ratio of 0.7 and, subsequently, physically activated by carbon dioxide. It has a BET surface area of 1479 m 2 /g, an average pore diameter of 4.2 nm, the total pore volume of 0.84 cm 3 /g, and the methane adsorption capacity of 159 cm 3 /g. The sample shows high stability during successive adsorption/desorption cycles experiment.

Alkali Activated Cedar Wood as an Efficient Adsorbent for Pb2+ Removal from Aqueous Solutions: Optimization, Kinetic and Thermodynamic Study

“…However, high operational cost, unaffordable on large-scale metals and being ineffective at higher concentrations make most of these methods inefficient. Adsorptive processes have been considered as one of the most common approaches in energy and environment industries because of its easy operation and low cost [11][12][13][14]. Various low-cost materials such as biomass, moss, fly ash, natural materials like clay and zeolite, clinoptilolite, and synthetic resins have been tested as adsorbent material for heavy metals removal from water samples [14][15][16][17][18][19][20][21][22].…”