Cátia Freitas*, Roberto D’Amato, João Braga, Catarina S. N. Gomes and Juliana P. S. Sousa,
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Sulfur- and Nitrogen-Functionalized Al2O3 Materials for Enhanced Arsenic Batch Adsorption
The adsorption of arsenic in aqueous solutions was successfully achieved by using functionalized Al2O3 materials. This process is important since arsenic in water is extremely toxic to humans and the environment. The adsorbent materials were prepared by functionalizing Al2O3 with sulfur and nitrogen species using different precursors. Several advanced analytical techniques (N2 adsorption–desorption isotherms at −196 °C, FTIR, TGA, XPS, and pHpzc) were used to characterize the functionalized Al2O3 adsorbents and study the success of the preparation methods. Arsenic adsorption capacity depends on a combination of factors: solution pH, electrostatic interactions, surface modifications, and coexisting substances. The qmax obtained for this study using the Langmuir model was found to be 246 mg/g at pH 3 for Al2O3functionalized with NH3. This is due to electrostatic interactions and functional groups at the adsorbent surface. Al2O3@NH3 also showed high adsorption capacities for As removal in the real water matrix.
期刊介绍：
Langmuir is an interdisciplinary journal publishing articles in the following subject categories:
Colloids: surfactants and self-assembly, dispersions, emulsions, foams
Interfaces: adsorption, reactions, films, forces
Biological Interfaces: biocolloids, biomolecular and biomimetic materials
Materials: nano- and mesostructured materials, polymers, gels, liquid crystals
Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry
Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals
However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do?
Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*.
This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).
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