Hummadi KK, Luo S, He S. Adsorption of methylene blue dye from the aqueous solution via bio-adsorption in the inverse fluidized-bed adsorption column using the torrefied rice husk.
CHEMOSPHERE 2022;
287:131907. [PMID:
34438211 DOI:
10.1016/j.chemosphere.2021.131907]
[Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Revised: 07/06/2021] [Accepted: 08/13/2021] [Indexed: 06/13/2023]
Abstract
In this work, the inverse fluidized-bed bio-adsorption column is applied for the first time and is demonstrated using the torrefied rice husk (TRH) for the removal of methylene blue from the solution. The bio-adsorbents were characterized by BET, FI-IR, and SEM. The inverse fluidized-bed adsorption column using TRH becomes saturated in the 95-min continuous adsorption, during which the breakthrough time is 22 min, the overall MB removal (R) is 84%, and the adsorption capacity (Qexp) on the TRH is 6.82 mg g-1. These adsorption characteristics are superior to those in the fixed-bed adsorption column (R of 52% and Qexp of 2.76 mg g-1) at a lower flow rate (100 vs. 283 cm3 min-1). Torrefaction of RH significantly increases the surface area (28 vs. 9 m2 g-1) and enhances the surface functional groups, leading to an improved maximum equilibrium adsorption amount from 21.5 to 38.0 mg g-1 according to Langmuir model in the batch adsorption system. Besides, the increased Qexp on the TRH is also obtained in the inverse fluidized-bed (5.25 vs. 2.77 mg g-1, 89% higher) and the fixed-bed (2.76 vs. 1.53 mg g-1, 80% higher) adsorption columns compared to that on the RH.
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