Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 6, Issue 1, Pages 649-659Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2017.12.062
Keywords
Adsorption; Methylene blue; Microwave; Nanoparticles; Silica
Categories
Funding
- CAPES (Brazilian Agency for Improvement of Graduate Personnel)
- CNPq (National Council of Science and Technological Development)
- FAPERGS
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Silica nanoparticles were obtained from rice husk through an alternative microwave process and applied to remove Methylene Blue dye (MB) from aqueous media by adsorption. The better characteristics of microwave modified nano-silica (MW-nSiO(2)), regarding to the standard nano-silica (nSiO(2)), were demonstrated by X-ray diffraction, infrared spectroscopy, N-2 adsorption isotherms, gas picnometry, differential scanning calorimetry and scanning electron microscopy. nSiO(2) and MW-nSiO(2) were used as adsorbents to remove MB dye from aqueous media. Adsorption kinetics, isotherms and thermodynamics were evaluated. MW-nSiO(2) presented higher values of surface area, pore volume, pore diameter and porosity than nSiO(2). Pseudo-n order and HSDM models were adequate to represent the kinetic profile. To represent the equilibrium curves, Sips model was the most adequate. MW-nSiO(2) attained adsorption capacity of 679.9 mg g(-1) coupled with removal percentage of 80%, being and excellent adsorbent for MB dye. For both adsorbents, the thermodynamic results revealed a favorable, spontaneous and exothermic process. These findings show that microwave is a powerful technique to intensify the silica production process, generating a material with better characteristics for dyes adsorption.
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