Highly efficient porous carbons for the removal of W(VI) oxyanion from wastewaters

JOURNAL OF HAZARDOUS MATERIALS

卷:412

Article

Dias, Diogo¹  Don, Davide²  Jandosov, Jakpar³  Bernardo, Maria⁴  Pinto, Filomena⁵  Fonseca, Isabel⁴  Sanches, Andre⁶  Caetano, Paulo Sa⁶  Lyubchyk, Svitlana⁴  Lapa, Nuno¹ 

[1] Univ Nova Lisboa UNL, Fac Ciencias & Tecnol FCT, Dept Ciencias & Tecnol Biomassa DCTB, LAQV REQUIMTE, P-2829516 Caparica, Portugal

[2] Univ Padua, Dipartimento Ingn Civile Edile & Ambientale, DICEA, Padua, Italy

[3] Asfendiyarov Kazakh Natl Med Univ, Sch Pharm, 94 Tole bi St, Alma Ata, Kazakhstan

[4] Univ Nova Lisboa UNL, Fac Ciencias & Tecnol FCT, Dept Quim DQ, LAQV REQUIMTE, P-2829516 Caparica, Portugal

[5] Lab Nacl Energia & Geol LNEG, Unidade Bioenergia UB, Estr Paco Lumiar,Ed J, P-1649038 Lisbon, Portugal

[6] Univ Nova Lisboa UNL, Fac Ciencias & Tecnol FCT, Polo FCTNOVA, GeoBioTec, P-2829516 Caparica, Portugal

关键词: Activated carbons;    Adsorption;    Pyrolysis;    Rice wastes;    Tungsten;   

DOI  :  10.1016/j.jhazmat.2021.125201

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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