Immobilization of graphene oxide into microbead for fluidized-bed adsorption of methylene blue
Desalination and Water Treatment(2024)
摘要
Graphene Oxide has shown outstanding performance in the application of adsorption, but these adsorbents are still limited due to some factors. Assembling 2-dimensional (2D) nanomaterials into 3-dimensional (3D) macrostructure (microbead, hydrogel, aerogel, sponge) is a promising alternative to solve the limitation. This paper embedded GO into the two natural polysaccharide polymers (agarose and sodium alginate) to form a 3D-adsorbent. GO-Alg and GO-Agar microbeads were synthesized using the crosslinking method. Analysis techniques such as FT-IR, FESEM-EDX, XRD, and zeta potential were used to characterize the GO-containing microbeads. Adsorption parameters such as adsorbent dosage, pH, contact time, initial ion concentration, and temperature were optimized. Langmuir isotherm and pseudo-first-order kinetic model well fit into the experiment data. The maximum adsorption capacity (qmax) obtained was 120.37 mg.g−1 for removing methylene blue solution. Thermodynamic parameters such as ∆G˚, ∆H˚, and ∆S˚ were determined, and the process was considered endothermic and spontaneous. Reusability results showed good regeneration of GO-Alg microbead up to eight consecutive adsorption-desorption cycles without a significant drop in removal efficiency (> 96%). The application of GO-Alg microbead for MB removal on a packed-bed reactor was investigated in different experimental conditions, and 1 mL.min−1 flow rate with 15 cm bed height revealed a better result. The application of fluidized-bed adsorption was performed to solve the limitation of packed-bed adsorption, and the result showed better adsorption performance than packed-bed using the same operating condition.
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关键词
Graphene oxide,Microbead,Adsorption,Fluidized-bed reactor,3D adsorbent
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