Strategic Brazilian Minerals Applied in the Photocatalytic Ozonation of Rhodamine B Using a Green Lithium Niobate Nanocatalyst Supported on Silica: Kinetic, Thermodynamic, Mechanism, Machine Learning, and Ecotoxicity Study
Matheus Londero da Costa, Cristiane dos Santos, Yolice Patricia MorenoRuiz, Giovani Pavoski, Jorge Alberto Soares Tenório, Denise Crocce Romano Espinosa, Jivago Schumacher de Oliveira
TL;DR
This study creates an eco-friendly nanocatalyst from rice husk and lemon to efficiently break down a harmful dye using light and ozone.
Contribution
A green nanocatalyst made from agro-industrial waste and Brazilian minerals for efficient dye degradation via photocatalytic ozonation.
Findings
The SiO2/LiNbO3 nanocatalyst achieved over 97% Rhodamine B degradation in under 60 minutes.
Superoxide radicals and valence holes were identified as the main degradation agents.
The KNN machine learning model accurately predicted degradation intermediates.
Abstract
This study presents the synthesis and use of a novel heterogeneous lithium niobate nanocatalyst supported on silica (SiO2/LiNbO3) obtained from rice husk for the degradation of the polluting dye Rhodamine B (RhB) through photocatalytic ozonation. The main objective was to create an eco-friendly nanocatalyst from agro-industrial waste (such as rice husk and lemon) and strategic Brazilian minerals (Nb and Li), fostering a circular economy. Rice husk was used for SiO2 extraction, while LiNbO3 nanoparticles were biosynthesized by using the hydrothermal method, employing lemon peel extract (Citrus latifolia). Characterization confirmed the porous morphology and the creation of nanoparticles (34 nm) with a high surface area, ideal for dye diffusion. Using central composite rotatable design (CCRD), the SiO2/LiNbO3 system showed high photodegradation efficiency (>97%) in less than 60 min,…
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Taxonomy
TopicsAdvanced oxidation water treatment · Layered Double Hydroxides Synthesis and Applications · Inorganic and Organometallic Chemistry