Green synthesis of CuO nanoparticles using Lantana camara flower extract and their potential catalytic activity towards the aza-Michael reaction

Abstract

Aza-Michael addition is one of the most exploited reactions in organic chemistry. It is regarded as one of the most popular and efficient methods for the creation of the carbon-nitrogen bond, which is a key feature of many bioactive molecules. Herein, we report the synthesis of CuO nanoparticles by an alkaline hydrolysis process in the presence of the flower extract of Lantana camara, an invasive weed, followed by calcination in air at 400 C. Microscopic results indicated that the plant extract played an important role in the modulation of the size and shape of the product. In the presence of extract, porous CuO nanostructures are formed. While mostly aggregated rod-shaped CuO nanostructures are formed in the absence of extract. The products are pure and highly crystalline possessing the monoclinic phase. The CuO nanoparticles have been used as a catalyst in the aza-Michael addition reaction in aqueous medium under ultrasound vibration. The product yield is excellent and the catalyst is reusable up to the fifth cycle. The catalyst system can be extended to various substituted substrates with excellent to moderate yields.

Green Synthesis and Characterization of CuO Nanoparticles Derived from Papaya Peel Extract for the Photocatalytic Degradation of Palm Oil Mill Effluent (POME)

“…with a wide range of reductive capacities acting as reducing as well as stabilizing agents during green synthesis. In the past, green synthesis of CuO nanostructures using different plant extracts such as Bauhinia tomentosa (leaf) [13], Euphorbia pulcherrima (flower) [14], Madhuca longifolia (flower and seed) [15], Lantana camara (flower) [16], Capparis spinosa (leaf) [17], Aloe vera (leaf) [18], Allium cepa, L. (peel) [19], and banana peel [12] have been demonstrated. In this study, we investigated the use of the water extract of waste papaya peel as reducing and stabilizing agents for the synthesis of copper oxide nanoparticles (CuO NPs).…”

Green Synthesis of Flower-Shaped Copper Oxide and Nickel Oxide Nanoparticles via Capparis decidua Leaf Extract for Synergic Adsorption-Photocatalytic Degradation of Pesticides

“…The synthesis of CuO nanoparticles can be used for different purposes. For example, Adiantum lunulatum was used to synthesize CuO to use as a plant defense booster [38], Lantana camara flower extract was used to enhance CuO catalytic and recyclability properties in an aza-Michael addition reaction [39], while Caesalpinia bonducella seed extract was used to synthesize a suitable CuO sensor for the electrochemical detection of riboflavin [40]. Other plant extracts were used to manufacture NiO nanoparticles.…”

Microwave-Assisted Synthesis of CuO Nanoparticles Using Cordia africana Lam. Leaf Extract for 4-Nitrophenol Reduction

“…CuO NPs have applications in photocatalysis [29], as an antimicrobial [30], in biomedical industry [31], as a gas sensor [32], as solar cells [33], and as batteries [34]. Reports have shown that CuO NPs have the capacity of catalyzing the reduction of 4-NP [35][36][37][38].…”