Activated carbons from the Co-pyrolysis of rice wastes for Cr(III) removal

Diogo Dias, Maria Bernardo, Nuno Lapa, Filomena Pinto, Inês Matos, Isabel Fonseca

Research output: Chapter in Book/Report/Conference proceedingChapter

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Abstract

Rice husk and polyethylene were mixed (50 % w/w each) and submitted to a pyrolysis assay. Four physical activations with CO2 were performed on the resulting co-pyrolysis char (PC). The activation at 800 °C, for 4h, generated the activated carbon (PAC3) with the best textural properties. PC, PAC3 and a commercial activated carbon (CAC) were characterized and submitted to Cr(III) removal assays. PC had a high percentage of volatile matter that was removed after the physical activation, resulting in more available pores in the final material (PAC). In the Cr(III) removal assays, two S/L ratios were tested: 5 and 10 g L-1. PC did not remove any Cr(III) from the solutions, but PAC presented similar results to CAC. At the S/L of 5 g L-1, Cr(III) removal was of 58.5 % for PAC and 62.5 % for CAC, both by adsorption mechanism; at the S/L of 10 g L-1, Cr(III) removal was almost complete due to precipitation caused by pH increase. The highest uptake capacities were of 7.92 mg g-1 for PAC and 8.71 mg g-1 for CAC, at the S/L of 5 g L-1. The results indicated that PAC3 may be a viable alternative to CAC on Cr(III) removal from aqueous media.

Original languageEnglish
Title of host publicationChemical Engineering Transactions
PublisherItalian Association of Chemical Engineering - AIDIC
Pages601-606
Number of pages6
Volume65
ISBN (Electronic)978-88-95608- 62-4
DOIs
Publication statusPublished - 1 Jan 2018

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Dias, D., Bernardo, M., Lapa, N., Pinto, F., Matos, I., & Fonseca, I. (2018). Activated carbons from the Co-pyrolysis of rice wastes for Cr(III) removal. In Chemical Engineering Transactions (Vol. 65, pp. 601-606). Italian Association of Chemical Engineering - AIDIC. https://doi.org/10.3303/CET1865101