University of Calicut

19 May 2019

Unravelling the mechanism of enhanced adsorption and photocatalytic activity in Core-shell nanocomposites

1. Unveiling core-shell nanostructuring driven enhancement in photocatalytic activity
2. Catalysis in core-shell nanocomposites enhanced through enrichment by shell and formation of nanoreactor in core
3. The catalytic capability of nanocatalyst analysed from three different directions
4. Magnetically separable photocatalysts with excellent water remediation properties
5. Critical role for pore hierarchy and adsorption capacity of impurity also studied for core shell nanoparticles

The core-shell nanoparticle on investigation exhibited a high visible light photocatalytic activity rate constant of 5.08x10 -1 min -1 on Congo Red. The origin of the enhanced activity attributed to core- shell nanostructuring as indicated by experiment varying dye concentration. The adsorption of Congo Red and Methylene Blue in single and binary system onto CZFO@STO was explained based on Langmuir isotherm and pseudo-second-order model. As a photocatalyst, the core-shell nanopartcle with magnetic core are recoverable and exhibited good recycling properties even in binary impurity system. An understanding of the enhanced catalytic activity is developed based on the adsorption capacity of dyes, scheme of adsorption, hierarchy of pores and advantages offered by core-shell nanostructuring including enrichment by shell and formation of a nanoreactor. The study could catapult bigger role for core-shell nanocomposites in adsorption driven fields of applications like catalysis, gas capture, sensing and energy storage.

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