Industrial textile effluent treatment and antibacterial effectiveness of Zea mays L. Dry husk mediated bio-synthesized copper oxide nanoparticles

Abstract

Zea mays L. dry husk extract was used to bio synthesize copper oxide nanoparticles. Red coloured cubic Cu 2 O nanoparticles were obtained for the first time via this simple, eco-friendly, green synthesis route. The Cu 2 O nanoparticles were thermally oxidized to pure monoclinic CuO nanoparticles at 600 °C. The phases of the copper oxides were confirmed from the x-ray diffraction (XRD) studies. The nanoparticle sizes as obtained from high resolution transmission electron microscope (HRTEM) analysis range from 10 to 26 nm, 36-73 nm and 30−90 nm for the unannealed Cu 2 O, 300 °C and 600 °C annealed CuO respectively. The values of the bandgap energies obtained from diffuse reflectance of the nanoparticles are 2.0, 1.30 and 1.42 eV respectively for the unannealed, 300 °C, and 600 °C annealed copper oxide nanoparticles. The 600 °C annealed copper oxide nanoparticles showed 91% and 90% degradation ability for methylene blue dye (BM) and textile effluent (TE) respectively under visible light irradiation. While CuO_300 is more effective to inhibit the growth of Escherichia coli 518,133 and Staphylococcus aureus 9144, Cu 2 O is better for Pseudomonas aeruginosa and Bacillus licheniformis. The results confirm the photo-catalytic and anti-microbial effectiveness of the copper oxide nanoparticles.

Diverse Synthesis and Characterization Techniques of Nanoparticles

“…Biological or biosynthesis of nanoparticles is an environmentally-friendly, green, and non-toxic method involving microorganisms [13][14][15]. Nanoparticles of iron oxide, silver, nickel oxide, copper oxide, zinc ferrite have been synthesized using this method [16][17][18][19][20][21][22]. The location of the nanoparticle determines the point of synthesis; whether intracellular or extracellular [1].…”

Impedance studies of biosynthesized Na0.8Ni0.33Co0.33Mn0.33O2applied in an aqueous sodium‐ion battery

“…The principles of green chemistry as proposed by Anastas and Warner 37 ultimately aim to use sustainable and greener materials and concepts to shield our surroundings from hazardous chemicals and processes. The detailed description of the aqueous extract of the Zea mays lea plant utilized in the synthesis, the phytochemicals present in the extract as well as the bio‐redox processes that yielded the complex metal oxide have been reported in our previous studies 3,38‐40 . We tested the biosynthesized material in an aqueous sodium ion battery in a Swagelok‐like cell using commercially available titanium dioxide (TiO 2 ) (Degussa P25) as the negative electrode.…”

Green Synthesis of Curcumin Conjugated CuO Nanoparticles for Catalytic Reduction of Methylene Blue

“…Faheem et al have used the leaf extract of A butilon Indicum to produce CuO NPs for anti‐microbial and antioxidant activities. Nwanya et al have used Zea mays L . husk extract for the preparation of CuO using green approach and use them for energy storage.…”