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Biochar is a promising adsorbent material, that has been used to eliminate different contaminants from water, including dyes. However, its applicability and cost are determined by the regeneration capacity. There are several methods studied for the regeneration of biochar, considering their efficiency, risk of generating secondary pollution, difficulty of application, and their cost/benefit ratio, being chemical regeneration one of the techniques with which the best results have been obtained in contaminant desorption from the biochar surface. In the present study, the regeneration capacity of biochar derived from Pinus patula previously used in the adsorption of crystal violet from water using different acids, bases, and solvents is evaluated. Among these reagents, solutions of sodium hydroxide and hydrochloric acid of 0.1 M, 75% ethanol (C2H6O), and two 95:5 mixtures of C2H6O (75% and 96%) and concentrated acetic acid (CH3COOH) were evaluated. With the mixture 95:5 C2H6O (96%):CH3COOH, the highest desorption efficiency was obtained (21.1%), so it was chosen as desorption agent and used for 6 consecutive adsorption-desorption cycles. After 6 cycles, the removal efficiency decreased up to 54.4%, so the biochar of study was determined to be used up to 6 completed cycles of treatment. Thus, it is demonstrated that biochar from Pinus patula pellets has a good regeneration capacity, which can reduce the cost of implementing the decontamination process and generate a positive impact on sustainable development, by contributing to the achievement of the principles by which the circular economy is governed.
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