Abstract
Herein, a novel CdS nanocomposite is fabricated by a facile one-pot hydrothermal method assisted by glucose and polyvinylpyrrolidone (PVP). The as-prepared CdS is coated with a thin layer, which is determined to be hydrothermal carbonation carbon (HTCC) mainly containing semiconductive polyfuran. The as-prepared HTCC-coated CdS shows superior photocatalytic activity for the degradation of Rhodamine B (RhB) under visible light irradiation (λ ≥ 420 nm). The optimum sample (glucose content of 0.1 g) shows a degradation rate four-times that of pure CdS reference. Moreover, it also shows an improved stability, and the activity can be maintained at 96.2% after three cycles of recycling. The enhanced photocatalytic activity and stability of nanocomposite can mainly be attributed to: (i) The addition of PVP in the reaction solution can significantly increase the specific surface area of CdS and thus offer more active sites; (ii) The HTCC in the nanocomposite can expand the range of light absorption; (iii) The HTCC layer can form a heterojunction with CdS and improve the charge separation and transfer.
Highlights
Environmental pollution and the energy crisis have become two of the most severe worldwide problems in the 21st century
hydrothermal carbonation carbon (HTCC) in the nanocomposite can expand the range of light absorption; (iii) The HTCC layer can form solution with was centrifuged to separate the photocatalyst solution after irradiation for areaction heterojunction
Materials synthesize HTCC‐coated cadmium sulfide (CdS) nanocomposite assisted by glucose and polyvinylpyrrolidone (PVP)
Summary
Environmental pollution and the energy crisis have become two of the most severe worldwide problems in the 21st century. As a widely-used semiconductor, it has a direct bandgap of around 2.4 eV, which matches well with visible light spectrum, and exhibits excellent photocatalytic activity under sunlight or visible light irradiation [7,8]. It has been applied in a wide range of fields, including optoelectronics, photovoltaics, and photocatalysis [9]. The CdS-based photocatalyst can hardly show its full potential in photocatalysis because of its high recombination rate of photoexcited electron–hole pairs and inherent photocorrosion problem under illumination [10]. Catalysts 2017, 7, 194 ways to overcome these problems and develop high-efficiency CdS-based photocatalyst. The amorphous coating layer of CdS is determined to be HTCC, which mainly contains
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