Removal of Remazol brilliant violet textile dye by adsorption using rice hulls

Geyse Adriana Corrêa Ribeiro,Auro Atsushi Tanaka,Sirlane Aparecida Abreu Santana,Cícero Wellington Brito Bezerra,Domingos Sérgio Araújo Silva,Clayane Carvalho Dos Santos,Adriana Pires Vieira

doi:10.1590/0104-1428.2386

Geyse Adriana Corrêa Ribeiro, Auro Atsushi Tanaka + Show 5 more

Open Access

https://doi.org/10.1590/0104-1428.2386

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Abstract

Abstract The release of industrial effluents into the environment causes widespread contamination of aquatic systems. Adsorption is seen as one of the most promising treatment processes, and lignocellulosic materials have gained prominence as adsorbents. This study investigates the potential of rice hulls, either in natura or treated with nitric acid, as adsorbents for removal of the dye. The adsorbents were characterized by infrared spectroscopy, solid state 13C-NMR, thermogravimetric analysis, and pH at point of zero charge. The dye adsorption experiments were carried out in batch mode, using different experimental conditions. The kinetic adsorption data could be fitted using the model of Elovich. The Freundlich model provided the best fit to the isothermal data. The thermodynamic parameters confirmed the spontaneity of the adsorption process. These adsorbents offer an alternative for dye removal, with advantages including biomass availability and low cost.

Highlights

The discharge of industrial effluents into the environment generally highly porous and have a large surface area[15].without adequate treatment is frequently a major problem, One widely used material is activated carbon, which offers due to the problems of contamination of water resources. high efficiency due to its structural characteristics, high Many industries, such as those concerned with leather surface area, and chemical nature[3]
Many processes are used in the treatment of wastewater containing dyes, such as biological oxidation and chemical adsorption[5,6,7], photoelectrochemical processes[8], treatment with zero-valent iron[9] and zero-valent iron/H2O2[10], heterogeneous photocatalysis combined with ozone treatment[11], hydrogen peroxide combined with UV[12], and others
The surface of rice hull was successfully modified by treatment with nitric acid, resulting in a decrease in the point of zero charge

Summary

Introduction

The discharge of industrial effluents into the environment generally highly porous and have a large surface area[15].without adequate treatment is frequently a major problem, One widely used material is activated carbon, which offers due to the problems of contamination of water resources. high efficiency due to its structural characteristics, high Many industries, such as those concerned with leather surface area, and chemical nature[3]. Many processes are used in the treatment of wastewater containing dyes, such as biological oxidation and chemical adsorption[5,6,7], photoelectrochemical processes[8], treatment with zero-valent iron[9] and zero-valent iron/H2O2[10], heterogeneous photocatalysis combined with ozone treatment[11], hydrogen peroxide combined with UV[12], and others. Many of these require appropriate conditions and have high operational costs. Adsorption has been shown to be very promising for the removal of textile dyes, since adsorbents can offer industrial practicality, low cost, high removal rates, and (in some cases) recovery of the species involved without losing their chemical identity[13]

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