Abstract
This paper describes the analysis and characterization of NayWOx bronze nanowires bundles and evaluation of their effective adsorption of methylene blue dye (MB). The Na-doped WOx bronze nanowires bundles were first synthesized via a simple solvothermal method, which were then fully characterized by using different techniques including TEM, XRD, XPS and UV-Vis, to validate the successful Na+ insertion into the WOx framework. The adsorption activities of the resulting NayWOx bronze nanowires bundles, compared with the undoped WOx form, were investigated by evaluating the adsorption effect on methylene blue under both UV and visible light irradiations. An enhanced adsorption performance of the Na-doped WOx bronze samples was recorded, which demonstrated a 90% of removal efficiency of the MB under different conditions (dark, visible and UV light). Moreover, the NayWOx bronze samples also offered a 4 times better kinetic rate of MB removal than the plain WOx nanowires.
Highlights
Water contamination is one of the key environment issues facing our globe, due to the rapid developments of industrialization and growth in population
While we are struggling to cope with the high demand for water resources, an increasing amount of wastewater is generated, which undermines the quality of precious water resources [1]
According to a report by the World Health Organisation (WHO), huge areas of the world are suffering from poor water quality, involving about 844 million people [2]
Summary
Water contamination is one of the key environment issues facing our globe, due to the rapid developments of industrialization and growth in population. Amongst many wastewater treatment technologies developed to date, semiconductorbased adsorption and photocatalysis are the most promising techniques, due to their high efficiency, low-cost, environmentally friendly nature, and sustainability These techniques have the potential for the removal of both harmful bacteria and organic pollutants by converting the pollutants into comparatively benign water and carbon dioxide [6,7]. WOx -based structures (x ≤ 3) are comparatively under studied, they possess the potential for the exploitation under the visible light range due to their various stoichiometric and unique structures [25] Their main drawback is that pure WO3 is not an efficient photocatalyst, due to its low conduction band level (0.5 V vs NHE) [26]. This study allows us to gain a deep insight into tungsten oxide-based adsorbent, offering guidance for the development of new adsorption technology
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