Production of carbonaceous material from avocado peel for its application as alternative adsorbent for dyes removal

doi:10.1016/j.cjche.2015.11.029

摘要/Abstract

摘要： Adsorption processes have received special attention for contaminants removal thanks to their capability to generate effluents with high quality as well as their simple design. In the current work, the agro-waste residue avocado peel is proposed to be used as alternative to conventional activated carbons whose use is sometimes restricted to high costs, upgraded by their exhausting after long term operations. The carbonization procedure was optimized and analyzed through factorial design and response surface methodology by evaluating temperature (400-900℃) and time (30-90 min) effects: optimal conditions were found at 900℃ and 65 min, generating an adsorbent with 87.52 m²·g^-1 of BET surface area, a mesopore volume of 74% and a zero point charge at 8.6. The feasibility of the carbonaceousmaterialwas proved for the removal of a variety of dyes by investigating substrate (10-50 mg·L^-1) and solid (0.5-20 g·L^-1) concentration effects and statistical significance: complete removal of Naphthol Blue Black and Reactive Black 5 was reached under optimal conditions (10 mg·L^-1 and 20 g·L^-1 of dye and solid, respectively),while Basic Blue 41was eliminated by using 13.4 g·L^-1 of the adsorbent. Overall, dyes removal by adsorption on carbonized avocado peel is presented as a promising technology due to the lowcost and easy availability of the precursor, aswell as the straightforward generation, the satisfactory characteristics and the proved adsorption capacity of the adsorbent.

关键词: Avocado peel, Carbonization, Optimization, Adsorption, Dyes

Abstract: Adsorption processes have received special attention for contaminants removal thanks to their capability to generate effluents with high quality as well as their simple design. In the current work, the agro-waste residue avocado peel is proposed to be used as alternative to conventional activated carbons whose use is sometimes restricted to high costs, upgraded by their exhausting after long term operations. The carbonization procedure was optimized and analyzed through factorial design and response surface methodology by evaluating temperature (400-900℃) and time (30-90 min) effects: optimal conditions were found at 900℃ and 65 min, generating an adsorbent with 87.52 m²·g^-1 of BET surface area, a mesopore volume of 74% and a zero point charge at 8.6. The feasibility of the carbonaceousmaterialwas proved for the removal of a variety of dyes by investigating substrate (10-50 mg·L^-1) and solid (0.5-20 g·L^-1) concentration effects and statistical significance: complete removal of Naphthol Blue Black and Reactive Black 5 was reached under optimal conditions (10 mg·L^-1 and 20 g·L^-1 of dye and solid, respectively),while Basic Blue 41was eliminated by using 13.4 g·L^-1 of the adsorbent. Overall, dyes removal by adsorption on carbonized avocado peel is presented as a promising technology due to the lowcost and easy availability of the precursor, aswell as the straightforward generation, the satisfactory characteristics and the proved adsorption capacity of the adsorbent.

Key words: Avocado peel, Carbonization, Optimization, Adsorption, Dyes

Carolyn Palma, Lucia Lloret, Antonio Puen, Maira Tobar, Elsa Contreras. Production of carbonaceous material from avocado peel for its application as alternative adsorbent for dyes removal[J]. Chinese Journal of Chemical Engineering, 2016, 24(4): 521-528.

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