Abstract
In this work, highly crystalline CdS nanorods (NRs) were successfully synthesized by a facile, one-step solvothermal method. The as-prepared CdS NRs powder was characterized by XRD, FESEM, Raman, PL, XPS, BET, and UV-visible techniques to evaluate the structural, morphological, and optical properties. The photocatalytic performance of the as-synthesized CdS NRs was investigated for the photodegradation of RhB dye under visible light irradiations. It has been found that CdS NRs show maximum RhB degradation efficiency of 88.4% in 120 min. The excellent photodegradation ability of the CdS NRs can be attributed to their rod-like structure together with their large surface area and surface state. The kinetic study indicated that the photodegradation process was best described by the pseudo-first-order kinetic model. The possible mechanism for the photodegradation of RhB dye over CdS NRs was proposed in this paper.
Highlights
The phase purity and crystallographic structure of the as-synthesized cadmium sulfide (CdS) NRs catalyst were investigated by using the X-ray diffraction (XRD) technique
The XRD peak intensities of the CdS NRs differ from the bulk material
It is noted that XRD peak intensity at 26.67◦ corresponding to (002) facet of CdS, is much more intense with a small width than all the other peaks, indicating the orientation growth of the nanorods along the c-axis [35], in agreement with Field emission scanning electron microscopy (FESEM) results
Summary
Organic dyes are considered a major class of environmental hazards, extensively produced by some industries such as the manufacture of plastics, papers, textile, food, cosmetic, drugs, and printing industries [3,4,5]. Inhalation of organic dyes can cause eye burns, profuse sweating, vomiting, nausea, and mental confusion [6,7]. Around 100,000 different types of synthetic dyes are produced with a production rate of 7 × 105 tons per year, and around 15% of the dyes are released into the natural ambiance [8]. The presence of dyes in waterbodies, even in a small amount, is a very concerning problem, as it affects the aesthetic nature and reduces the photosynthetic activity of aquatic plants and algae in aqueous environments [9]
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