Rice Husk Ash Modified with Vanadium Pentoxide

Isaías Alves Rodrigues,Valdeilson Souza Braga,Cailon França De Castro,Stéfane Oliveira De Lira,Tiago Dos Santos Estrela

doi:10.17807/orbital.v9i2.916

Isaías Alves Rodrigues, Valdeilson Souza Braga + Show 3 more

Open Access

https://doi.org/10.17807/orbital.v9i2.916

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Abstract

Rice husk collected in Barreiras City, Bahia, Brazil was converted to rice husk ash (RHA) by acidic or basic leaching, followed by calcination. The resulting RHA was modified with vanadium pentoxide (2, 5, or 10 mass% of V 2 O 5 ). The modified RHA samples were characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). RHA exhibited FTIR bands associated with silica. After modification of acid-leached RHA with vanadium, the XRD data indicated the formation of V 2 O 5 phases. Base-leached RHA modified with vanadium pentoxide showed the presence of the V 2 O 5 phase only in the sample containing 10 mass% V 2 O 5 . The FTIR data indicated the formation of cristobalite, where bands associated with Si-O-V interactions were observed only for the sample with 10 mass% V 2 O 5 prepared with acid-leached RHA. DOI: http://dx.doi.org/10.17807/orbital.v9i2.916

Highlights

Several studies have focused on the application of rice husk, motivated by its versatility, to add value and simultaneously ameliorate rice husk disposal issues [1]
Base-leached rice husk ash (RHA) modified with vanadium pentoxide showed the presence of the V2O5 phase only in the sample containing 10 mass% V2O5
This study aims to prepare rice husk ash (RHA) by leaching, followed by modification with vanadium pentoxide and characterization of the material

Summary

Introduction

Several studies have focused on the application of rice husk, motivated by its versatility, to add value and simultaneously ameliorate rice husk disposal issues [1]. Rice is widely produced in many countries, with a global production of 478.65 million tons of processed rice in 2015−2016. Brazilian production in the same period was 10.6029 million tons of processed rice, resulting in massive generation of rice husk [2, 3]. Silica from rice husk is commonly obtained by combustion of the husk or by acid or base leaching, followed by calcination [6]. Rice husk has been utilized in several applications for generation of thermal energy, producing adsorbents and materials for cement and concrete, and production of silica for use in the synthesis of catalysts (e.g., zeolites, MCM-41, and supported oxides) and other silicon-based materials [7−10]

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