Adsorption Characteristics of Coal-Based Activated Carbons. 1. Adsorption of Nitrogen and Carbon Dioxide

Abstract

Non-activated carbon from coal contains ultrafine pores in which adsorption of nitrogen at 77 K is controlled by activated diffusion. Carbons activated with phosphoric acid or with steam contain a large fraction of microporosity. However, they do not contain ultrafine pores or pore constrictions in which activated diffusion takes place. The BET equation can be applied to calculate the surface area of microporous carbon when the monolayer capacity lies in the relative pressure range 0.05–0.30, the BET areas in such cases being comparable with those obtained from the αs-method. The Dubinin–Radushkevich (D–R) equation is the most suitable for the interpretation of CO2 adsorption at 298 K. Chemical and physical activation starts with new pore creation, further activation being associated with pore widening. Microporosity is more predominant in chemically-activated carbons.

Bio-adsorbents for the Removal of Heavy Metals from Water

“…FTIR was used to determine the surface functional groups of raw avocado fruit waste seed. In Figure 1, the spectrum of the powdered avocado seed is represented, where the band located at 3259 cm À1 corresponds to v (OdH) vibrations in the hydroxyl group, while the strong peaks Arsenic -Analytical and Toxicological Studies at 2913 and 2848 cm À1 bands correspond to v(CdH) vibration in the alkane/alkyl aliphatic group which could be methylene [16][17][18][19][20]. The presence of alcohols and carbonyl groups was confirmed by the bond vibrations observed at 1633 cm À1 .…”

Chemical Liquid Deposition Modified ZSM-5 Zeolite for Adsorption Removal of Dimethyl Disulfide

“…Metal ion-exchanged Y zeolite was proven effective in removing sulfides from commercial fuels. In addition, a variety of porous adsorbents including carbon materials, , mesoporous materials, aluminum oxide, and MOF have also been used for liquid fuel desulfurization.…”