Porous Cd 0.5 Zn 0.5 S nanocages derived from ZIF-8: boosted photocatalytic performances under LED-visible light
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RESEARCH ARTICLE
Porous Cd0.5Zn0.5S nanocages derived from ZIF-8: boosted photocatalytic performances under LED-visible light Lin Wu 1 & Huifen Fu 1 & Qi Wei 2 & Qian Zhao 1 & Peng Wang 1 & Chong-Chen Wang 1 Received: 13 March 2020 / Accepted: 10 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A facile strategy was adopted to prepare porous Cd0.5Zn0.5S (CZS-X) nanocages by sulfurizing the rhombic dodecahedral ZIF-8 as precursor with thioacetamide (TAA) at different durations (0, 1, 3, 5 h), in which the fabrication mechanism of the porous CZS-X nanocages was clarified. The photocatalytic activities of CZS-X for Cr(VI) elimination and organic pollutant decomposition were assessed. The results revealed that CZS-3 exhibited optimal photocatalytic activity under visible light along with satisfied recyclability and stability after several runs’ operation. As well, the CZS-3’s photocatalytic cleanup abilities toward both Cr(VI) and organic pollutants were explored in different actual water bodies to clarify the influence of different foreign ions. Finally, the intrinsic photocatalysis mechanism of CZS-X was verified. Keywords ZIF-8 . Cd0.5Zn0.5S . Nanocage . Photocatalysis . Visible light
Introduction With the rapid expansion of industry and contemporary civilization, human living environment is under tremendous pressure due to the discharge of industrial and domestic wastewater containing various heavy metals and organic contaminants (Dong et al. 2017). The heavy metal Cr(VI) in the form of Cr2O72− is likely to accumulate in the human body and other creatures, which can exert a possible threat to ecological environment and human health (Chen et al. 2020). Cr(VI) was presented in extensive scope of concentrations ranging from 0.5 to 270.0 mg L−1 in natural water and industrial effluents (Demirbas et al. 2004). Being compared with the traditional Responsible Editor: Sami Rtimi Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-10812-1) contains supplementary material, which is available to authorized users. * Chong-Chen Wang [email protected]; [email protected] 1
Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
2
College of Materials Science and Engineering, Beijing University of Technology, Chaoyang District, Beijing 100124, China
adsorption (Lei et al. 2017), membrane separation (Pugazhenthi et al. 2005), and other physical methods (Galan et al. 2005; Heidmann and Calmano 2008; Xing et al. 2007), the photocatalytic method exhibited some advantages like mild reaction conditions and environment sustainability (Liang et al. 2015). Cr(VI) can be converted to lowtoxic Cr(III) via photocatalysis (Huang et al. 2017; Liang et al. 2015), and Cr(III) can be cleaned up as Cr(OH)3 precipitates under alkaline or even neutral conditions (Khalil et al.
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