ZSM-5 (Zeolite Scony Moblie-5) (SiO2/Al2O3 = 360, 470), NaY, 13X (pellet,
powder) and coconut shell
activated carbon (YK-AC) are employed for acetic acid separation from
dilute aqueous solutions via adsorption. Zeolite 13X exhibits a much
higher adsorption capacity than other zeolites and activated carbon.
The effects of adsorption time and different initial acetic acid concentrations
were studied. At 71.77 g·kg–1, the initial
acetic acid concentration, 13X in pellet exhibited the highest uptake
capacity of 354.03 mg·g–1 at 318 K. Meanwhile,
adsorption equilibrium, kinetics, and thermodynamics of an acetic
acid aqueous solution on zeolite 13X in pellet were studied in batch
experiments. Kinetic models such as pseudo-first-order, pseudo-second-order,
and Elovich have been used to describe the adsorption behavior of
zeolite 13X in pellet. Pseudo-second-order was found the most suitable
for this system. Langmuir and Freundlich isotherm models were applied
to experimental data depending on temperature. The Freundlich isotherm
fitted the experimental data better than the Langmuir isotherm for
adsorption of acetic acid. Using the thermodynamic equilibrium coefficients
obtained at different temperatures, the thermodynamic constants (ΔG, ΔH, and ΔS) of adsorption were also calculated, and the results indicated that
the adsorption process of acetic acid on zeolite 13X in pellet was
spontaneously endothermic.
Two-dimensional (2D) silicalite-1 zeolites are fabricated by introducing graphene oxide (GO) into a multilamellar MFI synthesis system. These composite materials exhibit high and controllable electrical conductivity with different amounts of GO.
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