Synthesis of Highly Stable Cobalt Nanomaterial Using Gallic Acid and Its Application in Catalysis

Abstract

We report the room temperature (25–30°C) green synthesis of cobalt nanomaterial (CoNM) in an aqueous medium using gallic acid as a reducing and stabilizing agent. pH 9.5 was found to favour the formation of well dispersed flower shaped CoNM. The optimization of various parameters in preparation of nanoscale was studied. The AFM, SEM, EDX, and XRD characterization studies provide detailed information about synthesized CoNM which were of 4–9 nm in dimensions. The highly stable CoNM were used to study their catalytic activity for removal of azo dyes by selecting methyl orange as a model compound. The results revealed that 0.4 mg of CoNM has shown 100% removal of dye from 50 μM aqueous solution of methyl orange. The synthesized CoNM can be easily recovered and recycled several times without decrease in their efficiency.

Mycosynthesis of silver nanoparticles bearing antibacterial activity

“…It has opened new avenues by intersecting with interdisciplinary field of science for innumerable applications (Morones et al, 2005). These nanomaterials are used in various fields such as electronic devices, sensor technology, signal enhancers, optical sensors, biomarkers, magnetic, catalysis, optical polarizability, electrical conductivity, antimicrobial activity and drug delivery to tumor cells (Nilsson et al, 2007, Duncan, 2011, Costa-Fernandez et al, 2006, Schrand et al, 2008, Naz et al, 2014, Shiraishi and Toshima, 2000, Ning et al, 2008, Sondi and Salopek-Sondi, 2004, Aliosmanoglu and Basaran, 2012, Syed et al, 2013). Hence nanoparticle research has gained tremendous interest especially use of silver nanoparticles has myriad applications in biomedical sector with large number of products already in market such as ointments, dressing materials and packaging materials (Sadowski et al, 2008).…”

Gallic Acid and Quercetin as Intelligent and Active Ingredients in Poly(vinyl alcohol) Films for Food Packaging

“…The peaks located at 1614, 1539, 1446 cm −1 represented the aromatic ring C=C stretching vibrations [42]. There are several peaks in 1300-1000 cm −1 region (1336, 1306, 1203 cm −1 ) that could be assigned to the stretching vibration of C-O bond and bending vibration of O-H [43]. Minor signals related to substituted benzene can be found at 985, 790, and 700 cm −1 .…”

Green synthesis of silver nanoplates using the special category of plant leaves showing the lotus effect

“…aromatic carboxylic acid group in gallic acid. 22 The band at 2934 cm À1 has been assigned to C-H stretching vibration and shoulder at 1730 cm À1 due to ketonic-CO group. The band at 1643 cm À1 is due to quercetin, 23 a avanoid present in the leaf extract of W. H. plant (Eichhornia crassipes) and no change in its intensity shows that this compound may be responsible for the stabilization of nanoplates.…”