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Metal nanoparticles anchored within inert and porous natural supports are emerging as safe and sustainable catalytic platforms for heterogeneous catalysis . We develop metal nanoparticles grafted 3D-megacatalyst (~80 cm2) by exploiting reductive potential of free-standing hydroxyl groups within proteinaceous surface of intact eggshell. Natural assembly of small gold nanoparticles (9±3 nm) throughout eggshells surface is one-step reduction cum stabilization phenomenon. This novel strategy imparts wide catalytic support area, stability to the megacatalyst for various liquid-phase ultra-efficient catalysis. As a proof-of-concept, we demonstrate three eclectic reactions including, large-volume degradations of organic and sewage-dyes, transesterification of used seed-oil and hydrogenation of nitroarenes at gram-scale. Moreover, the organically layered massive structure of our catalyst allowed acid-recovery of gold precursor post-poisoning to regenerate a new megacatalyst . Our rationale, naturally created, stable, ultra-cheap, zero-maintenance, reusable, hand-removable, resilient megacatalyst developed from left-over food-waste trounces majority of the existing challenges while utilizing nano-based catalysts for heterogeneous catalysis.
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supported-catalyst, biomatrix, environmentally green, hand-recyclable, gram-scale, sewage-dyes, bio-waste, resource management, hydrogenation, biodiesel, sustainable,, natural, facile, one-step, bio-template
 Fernandes, A. B. et al. Recoverable and Reusable Polymer Microbead-Supported Metal Nanocatalysts for Redox Chemical Transformations. ACS Appl. Nano Mater. (2020) doi:10.1021/acsanm.9b02433.