RT Journal Article
T1 Preparation of activated carbon from pine (Pinus radiata) sawdust  by chemical activation with zinc chloride for wood dye adsorption
A1 Pimentel, Catarina Helena da Silveira Miranda Guedes
A1 Freire Leira, María Sonia
A1 Gómez Díaz, Diego
A1 González Álvarez, Julia
K1 Activated carbon
K1  Chemical activation
K1 Zinc chloride
K1 Adsorption
K1 Pine sawdust 
K1 Wood dyes
AB Wastewater containing dyes are released into water bodies generating serious problems in human health and marine life. To contribute to the solution of this problem, a novel activated carbon was prepared from untreated pine (Pinus radiata) sawdust by dry chemical activation with ZnCl2 and was used for wood dye adsorption. The carbon was characterized by point of zero charge, N2 and CO2 adsorption isotherms, SEM-EDX, and FTIR. N2 and CO2 surface areas were 471.4 and 319.5 m2 g−1, respectively, with 91% of micropores. Wood dye adsorption was studied in function of pH (2–12), adsorbent dose (0.1–4 g L−1), time (up to 48 h for blue and red and 12 h for black), and initial concentration (5–500 mg L−1). The equilibrium data for the blue and black dyes were satisfactorily fitted to the Freundlich model while those for the red dye to the Langmuir model. Kinetic data were explained by the pseudo-second order (chemisorption process) and intraparticle diffusion models. At 5 mg L−1, a 100% removal efficiency was achieved at all pH for the blue dye, whereas for the red and black, natural pH (5.1) and pH = 2, respectively, led to the best removal efficiencies, 96 and 56%. Increasing concentration above 25 mg L−1 significantly reduced adsorption efficiency for blue and red dyes. For the black dye increasing the dose to 1 g L−1, the adsorption efficiency reached 82% at 25 mg L−1. High removal efficiencies were achieved for all dyes at 25 mg L−1 and 4 g L−1
PB Springer
SN 2190-6815
YR 2023
FD 2023
LK http://hdl.handle.net/10347/30857
UL http://hdl.handle.net/10347/30857
LA eng
NO Pimentel, C.H., Freire, M.S., Gómez-Díaz, D. et al. Preparation of activated carbon from pine (Pinus radiata) sawdust by chemical activation with zinc chloride for wood dye adsorption. Biomass Conv. Bioref. (2023). https://doi.org/10.1007/s13399-023-04138-4
NO Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. This work was supported by Consellería de Educación, Universidade e Formación Profesional, Xunta de Galicia, grant number ED431B 2020/039
DS Minerva
RD 28 abr 2026