Biofabrication of novel ZnO nanoparticles for efficient photodegradation of industrial dyes

Abstract

The removal of persistent dye pollutants from wastewater streams has drawn a lot of interest from the scienti c community because photocatalysis is the most widely used practical strategy for addressing environmental contamination. Transition-metal oxides are seen to be the most prospective catalysts for e cient and environmental friendly wastewater treatment because of their signi cant photocatalytic activity, excellent solubility, and durability. In this study, we describe the simple, eco-sustainable and cost effective synthesis of ZnO nanoparticles and their use as photocatalysts to break down organic dyes like Congo red (CR) and Malachite Green (MG) in aqueous media. In aqueous solution at ambient temperature, ZnO nanoparticles showed outstanding photocatalytic degradation e ciency of 98.9% for the MG dye and 92.8% for the CR dye. The kinetics of photodegradation were also investigated and followed a pseudo-rst-order mechanism, with rate constants of 0.0204 min − 1 MG and 0.0123 min − 1 for CR in accordance with the Langmuir-Hinshelwood model. Excellent recycling properties were displayed by ZnO nanoparticles for both dyes and the combined effects of their high adsorption capacity and photodegradation of organic dyes make them an extremely effective and affordable catalyst.

Green route to fabrication of Semal-ZnO nanoparticles for efficient solar-driven catalysis of noxious dyes in diverse aquatic environments

“…Figures 2A,B show the surface morphologies of the Semal-ZnO NPs under different magnifications; the SEM images show that most of the Semal-ZnO NPs are spherical and have a synthesized diameter range of 5–35 nm. The green Semal-ZnO NPs are also found to be aggregated and homogeneous owing to the stacking morphology ( Abdelbaky et al, 2022 ; Purkait et al, 2023 ; Sreelekshmi et al, 2023 ; Supin et al, 2023 ). The agglomerated particles indicate larger sizes with low surface-to-volume ratios.…”

“…1-079-2205), which was used as the reference with lattice parameters a = 3.2501 A and c = 5.2071 A using X'Pert HighScore Plus software (Figure 1B) (Abdelbaky et al, 2022;Chandrasekaran et al, 2023). The diffraction pattern revealed that all samples were in the same position and that no additional peaks of any alternative species were found, proving that all of the precursors were completely decomposed during the process (Figure 1B) (Sreelekshmi et al, 2023). The results also demonstrated that diffraction peaks corresponding to impurities were absent in the PXRD patterns, confirming the high purity of the synthesized Semal-ZnO NPs (Meena et al, 2023;Mishra et al, 2023).…”

Improved Photocatalytic and Antioxidant Activity of Olive Fruit Extract-Mediated ZnO Nanoparticles

“…However, these physicochemical methods, though some are technically viable, are accompanied with the use of hazardous chemicals, high-energy, long-time consumption and high cost. Alternatively, green synthesis of NPs has gained wide interest because of its low cost, low toxicity and eco-friendly nature [ 22 , 23 ]. Using plant extracts offers a green and sustainable opportunity for exploring the biosynthesis of ZnO NPs and is both more environmentally benign and more rapidly progressive than conventional chemical methods [ 16 , 24 ].…”

Nano-crystallite bones of Oreochromis niloticus and Katsuwonus pelamis for the photocatalytic degradation of Congo red dye

“…The photocatalytic way of organic pollutant removal is one of the most used ways and this process produces no secondary pollutants. There are different types of photo-catalysts such as TiO 2 [ 11 ], g-C 3 N 4 /TiO 2 [ 12 ], TiO 2 -WO 3 Nanocomposite [ 13 ], hydroxyapatite [ 14 ], ZnCoO [ 15 ], ZnFe 2 O 4 [ 16 ], ZnO [ 17 ], spinel ferrites/metal oxide nanocomposites [ 18 ] etc. There remains a cost associated with the catalyst which ultimately enhances the total cost of the wastewater treatment process.…”