Efficient Photodegradation of Biebrich Scarlet in Water by CuFe-LDH Decorated with Potential Photocatalysts
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Abstract
CuFe-layered double hydroxide (CuFe-LDH) is an environmentally friendly 2D material with positively charged active sites, offering a high ability to remove toxic anionic chemicals in wastewater. In the study, CuFe-LDH was synthesized by the precipitation under magnetic stirring for 12 h, followed by the hydrothermal reaction at 160 °C for 8 h, and utilized as both adsorbent and photocatalyst for eliminating Biebrich Scarlet anions from water. The as-prepared product corresponded to the LDH brucite-like structure with the interlayer nitrate anions and was decorated with FeOOH, Fe2O3, and CuO. Besides, CuAl-LDH exhibited a large surface area and broad absorption band in the 400–800 nm wavelength range. The product exhibited a high maximum adsorption capacity for removing Biebrich Scarlet in water through the electrostatic interaction and the efficient photocatalytic activity under visible light irradiation for 240 min. The excellent removal efficiency of the toxic species in water was attributed to the combined effects of CuFe-LDH and the semiconducting properties of FeOOH, Fe2O3, and CuO.
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