Effect of carbon nanotubes loading on the photocatalytic activity of BiSI/BiOI as a novel photocatalyst
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RESEARCH ARTICLE
Effect of carbon nanotubes loading on the photocatalytic activity of BiSI/BiOI as a novel photocatalyst Samin Bargozideh 1 & Mahboubeh Tasviri 1
&
Mana Ghabraei 1
Received: 28 March 2020 / Accepted: 15 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this paper, a simple hydrothermal method is employed to synthesize BiSI/BiOI/CNT nanocomposite with enhanced photocatalytic activity. The properties of the prepared samples were studied using nitrogen adsorption-desorption isotherm, photoluminescence, X-ray diffraction analysis (XRD), field-emission scanning electron microscopy (FE-SEM), energy dispersive spectrometry (EDS), UV–vis diffuse reflectance spectroscopy (DRS), and electrochemical impedance spectroscopy (EIS). The loading amount of CNT had a significant influence on the photoactivity of the BiSI/BiOI/CNT composite. In this study, several BiSI/BiOI/CNT nanocomposite samples with various mass ratios of CNT were made-up for further investigation to scrutinize the influence of CNT content on the photocatalytic activity of the nanocomposite. Photocatalysis measurements revealed that 2% Wt of CNT possesses the highest photocatalytic activity in the visible light irradiation with 93.1% photodegradation of malachite green (MG) as a test dye. The enhanced photocatalytic performance can be due to the large surface area, excellent conductivity performance, and high absorption ability in the visible light region. The synergistic effect of the factors mentioned above makes BiSI/BiOI/CNT nanocomposite a high-performance photocatalyst under visible light irradiation. An appropriate reaction mechanism of dye photodegradation has suggested according to the result of active species trapping experiments. Keywords Carbon nanotubes . BiSI/BiOI/CNT nanocomposite . Photocatalysts . Wastewater treatment . Dye degradation
Introduction A clean aquatic ecosystem is one of the vital requirements for humans’ health, but with growing industrial development and urbanization, its accessibility is a looming crisis nowadays. What is more, with the steady release of pollutions into the environment and the aggravation of the abating amount of water resources, is that several existing methods such as physical and biological methods are used in wastewater treatment techniques. These methods are conventional techniques, but they have unresolved problems, such as creating a secondary pollutant and resistance to the microorganism. Responsible editor: Sami Rtimi * Mahboubeh Tasviri [email protected] 1
Department of Physical Chemistry, Faculty of Chemistry and Petroleum Sciences, Shahid Beheshti University, P. O. Box, Tehran 19839-63113, Iran
Recent years have witnessed development researches on semiconductor photocatalysts owing to their utilization to mitigate the contamination of environments. The first privilege of this procedure is the formation of reactive species such as hydroxyl radicals (HO) and superoxide ions (O 2 ) for the decomposition of toxic compounds. Ideally, enormous scien
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