RT Journal Article
T1 Adsorption of an anionic dye (Congo red) from aqueous solutions by pine bark
A1 Litefti, Khaoula
A1 Freire Leira, María Sonia
A1 Stitou, Mostafa
A1 González Álvarez, Julia
K1 Chemical engineering
K1 Pollution remediation
AB Pinus pinaster bark, an abundant by-product from the timber industry, has been studied as a potentiallow-cost adsorbent for the removal of Congo red (CR) dye from wastewaters. Surface morphologicaland 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 maximumabsorbance and the stability with time of CR solutions depending on concentration and/or pH, whichresulted to be a very signifcant parameter. Adsorption studies were conducted on batch mode tostudy 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 andthe 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 pinebark were best ftted by the pseudo-second-order kinetic model. The equilibrium data ftted well withthe Freundlich model. Thermodynamic analysis indicated that the adsorption process is exothermic andspontaneous
PB Nature Publishing Group
YR 2019
FD 2019
LK http://hdl.handle.net/10347/22264
UL http://hdl.handle.net/10347/22264
LA eng
NO 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
NO Authors want to thank the Erasmus Mundus Maghreb and Egypte-Emmag program for a grant awarded to Khaoula Litefi
DS Minerva
RD 22 abr 2026