Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 607, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2020.125472
Keywords
Methyl orange; Eriochrome black T; Acid Blue 92; Adsorption; Hyper-cross-linked resin; Vant hoff plot
Categories
Funding
- KFUPM project [SB191017]
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The synthesis of a novel triazine based resin (TRIAZ-PA) has been accomplished for the ultrahigh and efficient removal of Methyl orange (MO), Eriochrom Black T (EBT) and Acid Blue 92 (AB92) from aqueous solution. At room temperature, the mesoporous TRIAZ-PA exhibited excellent adsorptive performance, displaying maximum adsorption capacities (Q(max)) of 620.5 mg g(-1), 198.3 mg g(-1) and 239.6 mg g(-1) for MO, EBT and AB92, respectively. Examination of the experimental adsorption data by non-linear curve fitting of four isotherm models suggested that Langmuir and Freundlich isotherms were the best-fit models in describing the adsorption of these dyes. The kinetics studies revealed faster rate of adsorption, as the equilibrium was achieved within the first 4 h. Moreover, thermodynamics calculations suggested that adsorption was spontaneous, exothermic and physical in nature. The adsorptive performance of the resin at varied pH indicates that beside electrostatic forces and hydrogen-bonding, other adsorption mechanism such hydrophobic interaction or pi-pi stacking interaction are also involved. The thermal stability of the resin was deduced by thermogravimetric analysis (TGA) (T-d < 300 degrees C) whereas its mesoporous nature was ascertained by Brunauer-Emmett-Teller (BET) analysis. The X-ray photoelectron spectroscopy (XPS) analysis of dye-loaded resins revealed two new peaks due to O 1s and S 2P at around 529.5 eV and 161.2 eV, hinting the adsorption of the sulfur-based dyes onto the resin. The resin exhibits good reusability, retaining adsorption efficiency of 70 % after four cycles of adsorption-desorption process.
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