Investigation of changes in surface chemistry on adsorption properties of palm shell-based activated carbon
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Abstract
The impact of changes in surface chemistry on adsorption properties of a palm shell-based activated carbon was studied. Two methods for producing activated carbon with basic surface were considered: heat treatment and ammonia treatment. It was found that decomposition of oxygen containing acidic groups and introduction of basic nitrogen functionalities on the carbon surface improved the adsorption ability of modified carbons. Amination was proposed as an alternative pathway to increase the adsorption ability of activated carbon toward acidic gases particularly at relatively high temperatures. It was apparent from the literature survey that the nature of the nitrogen surface groups depends on the temperature of ammonia modification. The results showed that amides, imides, imines, amines and nitriles dominated at low temperature (<600 ºC) while thermally stable aromatic rings such as pyrrole and pyridinic-like functionalities dominated at higher temperature (>600 ºC).
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