Mateus Gonçalves dos Santos*, Lucas Destefani Paquini, Paulo Henrique Leite Quintela, Luciene Paula Roberto Profeti and Damaris Guimarães,
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引用次数: 0
Abstract
Different materials have been used as adsorbents for removing micropollutants from industrial effluents, with vegetal-derived activated carbon being widely reported for dye removal, especially methylene blue (MB). However, its high cost and environmental concerns have driven the search for alternative adsorbents. Beyond developing new materials, understanding the interaction mechanisms between adsorbents and adsorbates is crucial. In this investigation, sodium (NaZ) and protonic (HZ) zeotypes were synthesized using diatomaceous earth (DE) residue as a silicon source and applied to MB dye adsorption. Batch experiments investigated adsorption rates, mechanisms, and thermodynamic spontaneity. The results showed rapid adsorption kinetics, with equilibrium achieved in about 5 min, following the Avrami model. The Weber and Morris model highlighted that the boundary layer significantly affects film diffusion and intraparticle diffusion. The adsorption process reached equilibrium governed by the Freundlich model, with favorable adsorption behavior for all adsorbents (nF values between 1 and 10). Additionally, the enthalpy values were found to be +39.66, + 5.70, and +21.79 kJ mol –1 for NaZ, HZ, and DE, respectively. This was accompanied by a decrease in Gibbs free energy with a progressive increase in temperature, indicating a more spontaneous process at higher temperatures. These results suggest that the adsorption of MB onto the synthesized zeotypes is efficient, with fast kinetics and thermodynamic favorability. The zeotypes synthesized from diatomaceous earth exhibit promising characteristics for potential large-scale applications in wastewater treatment.
ACS OmegaChemical Engineering-General Chemical Engineering
CiteScore
6.60
自引率
4.90%
发文量
3945
审稿时长
2.4 months
期刊介绍:
ACS Omega is an open-access global publication for scientific articles that describe new findings in chemistry and interfacing areas of science, without any perceived evaluation of immediate impact.