Adsorption of an anionic dye (Congo red) from aqueous solutions by pine bark

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URI: http://hdl.handle.net/10347/22264
E-ISSN: 2045-2322
DOI: 10.1038/s41598-019-53046-z

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2019

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Nature Publishing Group
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Abstract

Pinus pinaster bark, an abundant by-product from the timber industry, has been studied as a potential low-cost adsorbent for the removal of Congo red (CR) dye from wastewaters. Surface morphological and physico-chemical characteristics of pine bark were analysed using Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), determination of the point of zero charge (pHPZC) and elemental analysis. Assays were performed to determine the wavelength for the maximum absorbance and the stability with time of CR solutions depending on concentration and/or pH, which resulted to be a very signifcant parameter. Adsorption studies were conducted on batch mode to study the efect of contact time (till 7 days), pH (2–9), adsorbent dosage (1–10gL−1) and temperature (25–60°C). The bark adsorption capacity at equilibrium varied between 0.3 and 1.6mgg−1 and the equilibrium adsorption percentage between 23.4 and 100% depending on adsorbent dosage, temperature and pH at an initial CR concentration of 5mgL−1. Kinetic data for the removal of CR by pine bark were best ftted by the pseudo-second-order kinetic model. The equilibrium data ftted well with the Freundlich model. Thermodynamic analysis indicated that the adsorption process is exothermic and spontaneous

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Chemical engineering| Pollution remediation

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Litefti, K., Freire, M.S., Stitou, M., González Álvarez, J. (2019). Adsorption of an anionic dye (Congo red) from aqueous solutions by pine bark. Sci Rep 9, 16530. doi:10.1038/s41598-019-53046-z

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Authors want to thank the Erasmus Mundus Maghreb and Egypte-Emmag program for a grant awarded to Khaoula Litefi

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© The Author(s) 2019. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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