CuO-bentonite-gold nanocomposites: Facile green preparation and their characterization

In this work, we design a facile green preparation of CuO-bentonite-gold nanocomposites by a pillarization-immobilization method. Bentonite has been successfully pillared with CuO (CuOBentonite) by using Tinospora crispa leaf extract. Gold nanoparticle (AuNPs) has immobilized in the inter layer of CuO-Bentonite. The presence of an amine group acts as a source of nitrogen bases for a hydrolyzing agent in the formation of CuO-bentonite. Meanwhile, the flavonoid secondary metabolites play an essential role in reducing Au3+ to Au-0 nanoparticles. The dspacing value of CuO-bentonite was greater than dspacing value of Na-bentonite at 2h of 5.29 degrees, indicating CuO has been pillared in the bentonite interlayer. Moreover, AuNPs was systemically formed in the interlayer of CuO-bentonite confirmed by XRD and EDX. The morphology of CuO-bentonite-gold nanocomposites was in a layered shape with a particle size of approximately 30 nm. Additionally, this work reported a simple, affordable, and less-toxic method to modify bentonite for better performance. (c) 2020 Elsevier B.V. All rights reserved.

Automated summary

In this study, a facile green synthesis method for CuO-bentonite-gold nanocomposites was designed using pillarization-immobilization. CuO was successfully pillared in bentonite with Tinospora crispa leaf extract, and gold nanoparticles were immobilized in the interlayer. The dspacing value of CuO-bentonite indicated successful pillarization, and the formation of AuNPs in the interlayer was confirmed by XRD and EDX.