Detailed Analysis of Crystal Structure and Optical Properties of Green Synthesized Nanoparticles: Application for Photocatalyst Degradation of Methylene Blue

Abstract

We report the green chemistry reduction approach method for the synthesis of Manganese Oxide nanoparticles (MnO NPs), Copper Oxide nanoparticles (CuO NPs) and Manganese-doped Copper Oxide nanoparticles (Mn-doped CuO Nps). Aqueous extract from the seeds was used as reducing and capping agents. The detailed crystal structure analysis was investigated; crystallite size, crystallinity, morphological index, x-ray density, bulk density, specific surface area, porosity, Lorentz factor, Lorentz polarization factor and other parameters were calculated. Simple EDX mapping reveals the presence of Mn, Cu, O and C. FTIR analysis was used to determine the bond length of a nanocomposite. In the visible area, nanoparticles have higher optical absorption, with bandgaps varying from 1.79 (MnO), 2.18 eV (CuO) and 1.72 eV (Mn-doped CuO). After 90 min, the photodegradation rate of Mn-doped CuO nanocatalysts was 93.73 % while using a smaller amount of catalyst (0.1 g) at pH 7. The pseudo-first-order MB photocatalytic decomposition kinetic model has a high correlation coefficient value (R2 > 0.95). It was found that Mn-doped CuO NPs have higher photocatalytic efficiency and can be used as potential photocatalysts for industrial dye degradation. HIGHLIGHTS Green synthesis of Mn, Cu, and Mn-doped Cu nanoparticles by Bambusa seeds extract Characterized via XRD (crystal structure), UV-Vis Diffuse Reflectance spectra (UV-DRS), FT-IR (bond length), and FESEM-EDS analysis Photocatalytic degradation of organic methylene blue dye using Mn-doped CuO nanoparticles GRAPHICAL ABSTRACT

Trends in Green Chemistry Research between 2012 and 2022: Current Trends and Research Agenda

“…Quadrant I shows the most frequent and current terms, highlighting only green synthesis studies. These studies are motivated by the urgent need to change synthesis methods and procedures towards improving energy use, reducing both energy consumption [82] and the generation of complex waste with low recyclability and natural degradability [83], and outlining viable alternatives focused on reducing or eliminating negative impacts on the environment [84]. Quadrant II shows less frequent but more current terms that have emerged in recent years, such as systems thinking aimed at contextualising the fundamentals of chemistry in real-life events [79].…”

“…Sustainability 2023, 15, x FOR PEER REVIEW 16 of 23degradability[83], and outlining viable alternatives focused on reducing or eliminating negative impacts on the environment[84].…”