RT Journal Article
T1 Removal of wood dyes from aqueous solutions by sorption on untreated pine (Pinus radiata) sawdust
A1 Pimentel, Catarina Helena
A1 Freire Leira, María Sonia
A1 Gómez Díaz, Diego
A1 González Álvarez, Julia
K1 Biomass
K1 Pine sawdust
K1 Wood dyes
K1 Biosorption
K1 Wastewaters
K1 Chemisorption
AB In this work, the possibility of using un-treated pine (Pinus radiata) sawdust as biosorbent for the removal of three wood dyes (blue, red and black) from aqueous solutions was investigated. The BET surface area of the material was 1.55 ± 0.81 m2 g−1 using N2 at − 196 °C and 17.83 ± 0.032 m2 g−1 using CO2 at 0 °C. The point of zero charge was 4.8. In addition, the material was characterized before and after adsorption by surface analytical techniques. Assays were performed to analize the stability of wood dyes with time and pH and also to estimate the pKa values. Batch adsorption experiments were performed and the influence of experimental parameters such as contact time (up to equilibrium), stirring rate (100 and 210 rpm), adsorbent dose (2–10 g L−1), pH (2–9) and initial dye concentration (5 and 300 mg L−1) were studied. The optimum conditions were pH 2 and adsorbent dose of 6 g L−1 and the highest adsorption percentages achieved at 5 mg L−1 were: 100.0% for the blue, 99.7% for the black and 92.4% for the red. For 300 mg L−1 adsorption efficiency decreased to 85.6, 57.0 and 63.8% for the blue, black and red ones, respectively. Kinetic data were best fitted to the pseudo-second order model, suggesting a chemisorption process. Freundlich and Dubidin-Radushkevich were the best isotherm models. Regeneration study showed that un-treated pine sawdust could be reused efficiently for red dye removal at least in up to four repeated adsorption–desorption cycles using NaOH as desorption agent
PB Springer
SN 0969-0239
YR 2023
FD 2023
LK http://hdl.handle.net/10347/30383
UL http://hdl.handle.net/10347/30383
LA eng
NO Pimentel, C.H., Freire, M.S., Gómez-Díaz, D. et al. Removal of wood dyes from aqueous solutions by sorption on untreated pine (Pinus radiata) sawdust. Cellulose (2023). https://doi.org/10.1007/s10570-023-05145-4
NO Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. This work was financial supported by Xunta de Galicia (ED431B 2020/039)
DS Minerva
RD 24 abr 2026