TY - JOUR
T1 - Highly efficient porous carbons for the removal of W(VI) oxyanion from wastewaters
AU - Dias, Diogo
AU - Don, Davide
AU - Jandosov, Jakpar
AU - Bernardo, Maria
AU - Pinto, Filomena
AU - Fonseca, Isabel
AU - Sanches, André
AU - Caetano, Paulo Sá
AU - Lyubchyk, Svitlana
AU - Lapa, Nuno
N1 - info:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FAAG-REC%2F3477%2F2012/PT#
info:eu-repo/grantAgreement/EC/H2020/734641/EU#
34641) within the EU Horizon 2020 RISE programme H2020-MSCA-RISE-2016.
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50006%2F2020/PT#
info:eu-repo/grantAgreement/FCT/OE/SFRH%2FBD%2F101751%2F2014/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04035%2F2020/PT#
PY - 2021/6/15
Y1 - 2021/6/15
N2 - Pyrolysis chars derived from rice wastes were chemically activated and used in W(VI) oxyanion adsorption assays in synthetic and mining wastewaters. For comparison purposes, a commercial activated carbon (CAC) was also used. Different experimental conditions were tested in the adsorption assays: solid/liquid ratio (S/L), initial pH, contact time, and initial W concentration. The porous carbon P2C+KOH presented the overall best performance in both media, due to its high surface area (2610 m2 g−1), mesopore volume (1.14 cm3 g−1), and neutral pHpzc (6.92). In the synthetic wastewater, the highest uptake capacity of P2C+KOH (854 mg g−1) was found in the assays with an S/L 0.1 g L−1, an initial pH 2, and an initial W concentration of 150 mg L−1, for 24 h. This value was almost 8 times higher than the one obtained for CAC (113 mg g−1). In the mining wastewater, P2C+KOH showed an even higher uptake capacity (1561 mg g−1) in the assay with the same experimental conditions, which was almost 3 times higher than for CAC (561 mg g−1). These results suggest that P2C+KOH seems to be an efficient alternative to CAC in the W(VI) adsorption from liquid effluents.
AB - Pyrolysis chars derived from rice wastes were chemically activated and used in W(VI) oxyanion adsorption assays in synthetic and mining wastewaters. For comparison purposes, a commercial activated carbon (CAC) was also used. Different experimental conditions were tested in the adsorption assays: solid/liquid ratio (S/L), initial pH, contact time, and initial W concentration. The porous carbon P2C+KOH presented the overall best performance in both media, due to its high surface area (2610 m2 g−1), mesopore volume (1.14 cm3 g−1), and neutral pHpzc (6.92). In the synthetic wastewater, the highest uptake capacity of P2C+KOH (854 mg g−1) was found in the assays with an S/L 0.1 g L−1, an initial pH 2, and an initial W concentration of 150 mg L−1, for 24 h. This value was almost 8 times higher than the one obtained for CAC (113 mg g−1). In the mining wastewater, P2C+KOH showed an even higher uptake capacity (1561 mg g−1) in the assay with the same experimental conditions, which was almost 3 times higher than for CAC (561 mg g−1). These results suggest that P2C+KOH seems to be an efficient alternative to CAC in the W(VI) adsorption from liquid effluents.
KW - Activated carbons
KW - Adsorption
KW - Pyrolysis
KW - Rice wastes
KW - Tungsten
UR - http://www.scopus.com/inward/record.url?scp=85100053694&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2021.125201
DO - 10.1016/j.jhazmat.2021.125201
M3 - Article
C2 - 33524731
AN - SCOPUS:85100053694
SN - 0304-3894
VL - 412
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 125201
ER -