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Efficient reduction of Cr(VI) under visible light irradiation using CuS nanostructures
Arabian Journal of Chemistry ( IF 6 ) Pub Date : 2019-02-01 , DOI: 10.1016/j.arabjc.2018.01.002
Sawsen Nezar , Yacine Cherifi , Alexandre Barras , Ahmed Addad , Elhadj Dogheche , Nadia Saoula , Nadia Aϊcha Laoufi , Pascal Roussel , Sabine Szunerits , Rabah Boukherroub

Abstract Photoreduction of hexavalent chromium, Cr(VI), identified as carcinogenic and mutagenic element, to Cr(III), believed to be an essential element, using copper sulfide nanostructures (CuS NSs) as photocatalyst was investigated under visible light irradiation (λ > 420 nm). The CuS NSs were synthesized at low temperature using a wet chemical route and fully characterized using various techniques such as scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy and UV–vis spectrophotometry. The photocatalytic reduction of Cr(VI) using visible light irradiation was assessed by UV–vis by following the decrease of the characteristic absorbance at ∼352 nm in the presence of CuS NSs. While CuS NSs promoted Cr(VI) full reduction within 60 min, addition of adipic acid or formic acid accelerated significantly the photocatalytic reduction process. Under optimized conditions, CuS NSs rapidly (12 min) reduced Cr(VI) in presence of 0.5 mM adipic acid. Similarly, Cu NSs were found to be efficient for Cr(VI) reduction dissolved in water from a local lake. Stability studies showed that the photocatalyst could be recycled up to four times without any apparent decrease of its catalytic performance.

中文翻译:

使用 CuS 纳米结构在可见光照射下有效还原 Cr(VI)

摘要 使用硫化铜纳米结构 (CuS NSs) 作为光催化剂,在可见光照射 (λ > 420 纳米)。CuS NSs 是使用湿化学途径在低温下合成的,并使用扫描电子显微镜、透射电子显微镜、X 射线衍射、X 射线光电子能谱、拉曼光谱和紫外-可见分光光度法等各种技术进行全面表征。在 CuS NSs 存在下,通过在~352 nm 处的特征吸光度降低,通过 UV-vis 评估使用可见光照射对 Cr(VI) 的光催化还原。虽然 CuS NSs 在 60 分钟内促进了 Cr(VI) 的完全还原,己二酸或甲酸的加入显着加速了光催化还原过程。在优化条件下,CuS NSs 在 0.5 mM 己二酸存在下迅速(12 分钟)还原 Cr(VI)。同样,发现 Cu NSs 可有效还原溶解在当地湖泊水中的 Cr(VI)。稳定性研究表明,光催化剂最多可循环使用四次,而其催化性能没有任何明显下降。
更新日期:2019-02-01
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