Solar Induced Photocatalytic Degradation of Methylene Blue by CdS/Ag₂O Nanocomposites

Abstract

Present investigation reports the synthesis of stable as well as visible-light active CdS/Ag 2 O nanocomposite photocatalysts in three varied ratios to be engaged in degradation of methylene blue (MB) dye. As-synthesized photocatalysts have been characterized with the aid of diverse characterization techniques such as X-ray diffraction (XRD), FT-Raman, Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), UV-visible and Photoluminescence (PL) spectroscopy, and transmission electron microscopy (TEM). XRD pattern clearly depicts the presence of hexagonal CdS phase and cubic Ag 2 O phase. Results show a remarkable enhancement of photocatalytic activity for MB degradation especially for CdS/Ag 2 O nanocomposite with maximum efficiency up to 88.8 %. Moreover, the effective bandgap of CdS/ Ag 2 O (1 : 2) nanocomposite has been significantly reduced to 1.71 eV from pure CdS (2.15 eV). It can be derived that CdS/ Ag 2 O photocatalysis may be envisaged for treatment of diluted waste water containing organic pollutants. Figure 13. Reusability of CdS/Ag 2 O (1 : 2) nanocomposite for degradation of MB. ChemistrySelectFull Papers

Effect of Molarity on Methylene Blue Dye Removal Efficacy of Nano Ca(OH)2

“…[19] The CdS/Ag 2 O nanocomposites are utilized for photocatalytic degradation of MB and with the maximum efficiency of up to 88.8 %. [20] The exploitation of the photoluminescence (PL) spectroscopy confirms the successful adsorption of the toxic Cd 2 + and Pb 2 + ions from simulated wastewater is reported to be achieved by the utilization of the GOÀ Mg-(OH) 2 nanocomposite. [21] There is a singular report on the usage of Ag-doped calcium hydroxide for MB dye removal from wastewater.…”

“…Further, the roles of pH, nanocomposite concentration, contact time, temperature, and dye concentration are investigated to find out the best efficiency of the MB dye removal process [19] . The CdS/Ag 2 O nanocomposites are utilized for photocatalytic degradation of MB and with the maximum efficiency of up to 88.8 % [20] . The exploitation of the photoluminescence (PL) spectroscopy confirms the successful adsorption of the toxic Cd 2+ and Pb 2+ ions from simulated wastewater is reported to be achieved by the utilization of the GO−Mg(OH) 2 nanocomposite [21] .…”

“…There is a singular report on the usage of Ag‐doped calcium hydroxide for MB dye removal from wastewater [16] . The aforesaid literature survey clearly points out that the systematic studies on how a change of molarity of chemical reactants in the chemical precipitation process of calcium hydroxide affects the physical and especially, the wastewater treatment efficacy are far from well‐studied [1–21] . This gap of information in literature creates the scope of this study.…”

Facile Ion Exchange Synthesis of Ag, Cu, and Sn Incorporated Defect Pyrochlore K2Ta2O6 towards Visible‐Light‐Responsive Photocatalytic Activity

“…It can be observed in Figure 8(b) that intensity of parent absorption peaks of MB reduced with an increase in the irradiation time and no new peaks were detected after the photocatalytic degradation experiment, which substantiates the degradation of MB dye. The kinetic studies of the MB degradation process are investigated using the Langmuir‐Hinshelwood model [20] by plotting ln(C 0 /C) against irradiation time as shown in Figure 9. According to Langmuir–Hinshelwood model, the rate expression is given by Equation 1. …”

Z-scheme CdS/BiVO4 Photocatalyst for Highly Efficient Photodegradation of Organic Pollutants and DFT Calculation

“…Despite composite photocatalysts have revealed many advantages, most approaches in preparing composite photocatalysts exist some limitations to some extent. P. Joice Sophia et al synthesized CdS/Ag2O nanocomposites by chemical precipitation method [20]. In this method, the excessive NaOH was added in the preparation process to generate Ag2O, which will lead to multiple subsequent cleaning, and the generated flocculent precipitation needed to be dried at 160°C.…”