Enhancement Photocatalytic Activity of Mn Doped Cds/Zno Nanocomposites for the Degradation of Methylene Blue Under Solar Light Irradiation

Abstract

In this study, Mn doped CdS/ZnO nanocomposites synthesized by co-precipitation method and its photocatalytic activity was tested using methylene blue under solar light irradiation. The prepared hybrid nanocomposites are characterized by using different physicochemical techniques including XRD, FESEM, EDX, TEM, UV-vis DRS and PL analysis. From the XRD analysis, Mn doped ZnO/CdS nanocomposite diffraction peaks only reflect the binary crystalline structures of ZnO and CdS. However, there is no characteristic peak of Mn is found that may be because of low content of Mn doped on ZnO/CdS. But Mn (2.9 wt%) was detected in the Mn doped ZnO/CdS nanocomposite, which was measured by EDX analysis. The FESEM and TEM results exhibit the surface particle of Mn doped ZnO/CdS nanocomposite which have spherical nature and confirmed the formation of Mn doped ZnO/CdS nanocomposites. The photocatalytic degradation results have revealed that the Mn doped CdS/ZnO nanocomposites exhibit admirable activity toward the photocatalytic degradation of the MB. The reason for excellent photocatalytic activity of Mn doped CdS/ZnO nanocomposites indicates the absorbance band shifted to red region and reduction of recombination of photogenerated electron-hole, which is in good agreement with UV-visible DRS analysis and PL study results. The fitted kinetic plots showed a pseudo-first-order reaction model and the appropriate rate constants were found to be 0.0068 min−1, 0.00846 min−1, and 0.0188 min−1, for ZnO, 25 % CdS/ZnO, and 0.8 mol% Mn doped CdS/ZnO nanocomposites, respectively. The maximum photocatalytic activity was achieved by 0.8 mol% Mn doped CdS/ZnO nanocomposites with a 95% degradation efficiency of MB. Hydroxyl and superoxide radicals, having a vital role in the degradation of MB, confirmed scavenging experiments. In addition, the recycling tests displays that the Mn doped CdS/ZnO nanocomposites have shown good stability and long durability. The enhanced photodegradation activity of Mn doped CdS/ZnO nanocomposites indicates the potential of the nanocomposite for the treatment of organic pollutants from the textile wastewater.

Eco-Friendly Adsorption of Cationic (Methylene Blue) and Anionic (Congo Red) Dyes from Aqueous Solutions Using Sawdust

“…Moreover, MB affects plant life, inhibiting growth and reducing pigment and protein content in certain microalgae species. Therefore, the thorough treatment of wastewater containing MB dye is essential before industrial discharge [14][15][16].…”

Characterization and Removal Efficiency Analysis of MWCNT/Clay Nanocomposites for MB Dye Adsorption

“…Its presence, however, poses significant challenges to plants, leading to growth inhibition, reduction in pigment, and protein content of microalgae. Given the harmful effects of wastewater containing methylene blue (MB) dye, comprehensive treatment is mandated prior to industrial discharge [17][18][19]. This work seeks to explore the advancements, challenges, and future prospects of dye removal techniques, with a particular emphasis on the application and optimization of the adsorption method.…”

Antibacterial Mesoporous Silica Granules Containing a Stable N-Halamine Moiety

“…At present, the lack of clean drinking water has become a serious challenge for many countries in the world . In the field of water purification, microbial contamination remains one of the most serious problems. , Commonly used water disinfection methods in the past few decades include free halogens, ozone, chloramine, and ultraviolet light. , However, these disinfection methods have some disadvantages. Free chlorine, ozone, and chloramine are strong oxidants, which may react with organic impurities in water to form undesirable byproducts during disinfection of drinking water. , Ultraviolet light does not have long-lasting sterilization ability and may lead to secondary microbial contamination of disinfected water …”

“… 4 , 5 Commonly used water disinfection methods in the past few decades include free halogens, ozone, chloramine, and ultraviolet light. 6 , 7 However, these disinfection methods have some disadvantages. Free chlorine, ozone, and chloramine are strong oxidants, which may react with organic impurities in water to form undesirable byproducts during disinfection of drinking water.…”