R. Vela-Vázquez, A. R. Vilchis-Nestor, Ana M. Herrera-González, U. Salazar-Kuri, E. Cadena-Torres, A. Pérez-Centeno, L. Tepech-Carrillo, A. Escobedo-Morales
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Abstract
The synthesis of bismuth oxyiodide-oxychloride mixed phase (BiO-IxCly) nanocomposites is reported. Their adsorption capacity and photocatalytic activity were evaluated in the removal of RhB dye from water under visible light illumination as a model system. The microstructure and optical properties of the obtained materials were studied in detail using several characterization techniques. It was found that the phase composition and resulting morphology depend on the nominal I:Cl molar ratio. The adsorption capacity/photocatalytic activity of the BiO-IxCly nanocomposites tends to increase with the iodide/chloride content. Adsorption efficiencies as large as 80.0% were achieved for those nanocomposites with significant Bi5O7I content; however, their photocatalytic activity is moderate (>70%). The nanocomposite with intermediate chloride content showed the highest photocatalytic efficiency (89.3%). It is ascribed to a large active phase (Bi3O4Cl) content and the formation of in-built electric fields at Bi5O7I-Bi3O4Cl heterojunctions. The synergy of photocatalytic activity and moderate adsorption capacity allows Bi5O7I-Bi3O4Cl nanocomposites to achieve a total removal efficiency as high as 96.4%. Possible physicochemical mechanisms are proposed.
期刊介绍：
The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size.
Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology.
The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.
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