Reagent activation of activated carbon obtained from wreck walnut shells and textural characteristics

The paper studies the textural and sorption characteristics of activated carbon obtained from walnut shells after acid and alkaline activation. Acid activation was carried out using phosphoric and sulfuric acids, and alkaline activation was carried out using potassium hydroxide. It has been established that alkaline activation increases the surface area to 1200 m²/g and the pore volume to 0.90 cm³/g, which makes this method preferable for the adsorption of organic pollutants. Acid activation, reaching a surface area of 850 m²/g, promotes the introduction of oxygen-containing functional groups, which increases the selectivity of coal to heavy metals. The obtained results confirm the high potential of using walnut shells as raw materials for the production of effective sorbents suitable for use in environmental and industrial processes.

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