Layered double hydroxides as heterostructure LDH@Bi 2 WO 6 oriented toward visible-light-driven applications: synthesis,
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Layered double hydroxides as heterostructure LDH@ Bi2WO6 oriented toward visible‑light‑driven applications: synthesis, characterization, and its photocatalytic properties Willison E. O. Campos1 · Anna S. C. Lopes1 · Waldinei R. Monteiro1 · Geraldo N. R. Filho1 · Francisco X. Nobre2 · Patrícia T. S. Luz3 · Luís A. S. Nascimento1,4 · Carlos E. F. Costa1,4 · Wesley F. Monteiro5 · Michele O. Vieira5 · José R. Zamian1 Received: 30 April 2020 / Accepted: 29 July 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract In this work, we report the obtention of the LDH@Bi2WO6 heterostructure using an easy and low-cost method. The LDH was synthesized through the co-precipitation method with the metallic ratio of Mg2+/Al3+ = 2.0, while the bismuth tungstate nanoplates were prepared using the hydrothermal method. The LDH@Bi2WO6 heterostructure was obtained mixing LDH in water with 20 wt% of B i2WO6. The LDH, Bi2WO6 and LDH@Bi2WO6 heterostructure were characterized by XRD, FTIR, N2 sorption, SEM, TEM, Raman, and DRS. The photocatalytic activity of these materials was evaluated by the photodegradation of RhB in aqueous solution under simulated sunlight irradiation. The characterization revealed the deposition of LDH on the surface of B i2WO6, as well as a considerable increase in the photocatalytic activity (synergistic effect) of the LDH@Bi2WO6 heterostructure when compared with pure LDH and B i2WO6. For this material, the degradation rate, velocity constant rate, and half-life time experimentally obtained were equal to 98.7%, 51.9 × 10– 3 min−1, and 13.3 min, at the end of 75 min in the photodegradation of RhB. It is also 166 times faster than the photolysis test, with a high stability after five consecutive photocatalytic cycles. Therefore, the LDH@Bi2WO6 heterostructure is a promising material in the photodegradation of organic pollutants using visible-light as the source of radiation. Keywords LDH · Bi2WO6 · LDH@Bi2WO6 · Photocatalysis · Rhodamine B Electronic supplementary material The online version of this article (https://doi.org/10.1007/s1114 4-020-01830-8) contains supplementary material, which is available to authorized users. * Willison E. O. Campos [email protected] Extended author information available on the last page of the article
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Reaction Kinetics, Mechanisms and Catalysis
Introduction The global concern about environmental pollutants regardless of their origin (air, soil, or water) entails investment in research for the development of specific and selective materials capable of mitigating the environmental impacts caused by them. Among the examples, recent research focusing on the capture and conversion of greenhouse gases [1–6], adsorption of heavy metals in water [7–9], removal of pollutants in soils [10–12] among others, highlight the importance of this issue. Persistent organic pollutants (POPs) have attracted much attention in the last years due to the imminent risk, dissemination, and intoxication by hydric, soil and air vectors [10]. Among these, pes
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