Potential of Araucaria angustifolia bark as adsorbent to remove Gentian Violet dye from aqueous effluents

Abstract

Araucaria angustifolia bark (AA-bark), a waste generated in wood processing, was evaluated as a potential adsorbent to remove Gentian Violet (GV) dye from aqueous solutions. The AA-bark presented an amorphous structure with irregular surface and was composed mainly of lignin and holocellulose. These characteristics indicated that the adsorbent contains available sites to accommodate the dye molecules. The GV adsorption on AA-bark was favored at pH 8.0 with adsorbent dosage of 0.80 g L−1. Pseudo-nth order model was adequate to represent the adsorption kinetics of GV on AA-bark. A fast adsorption rate was verified, with the equilibrium being attained within 30 min. Equilibrium data were well represented by the Langmuir model. The maximum adsorption capacity was 305.3 mg g−1. Adsorption was spontaneous, favorable and endothermic. AA-bark was able to treat a simulated dye house effluent, reaching color removal values of 80%. An excellent performance was found in fixed bed experiments, where the length of the mass transfer zone was only 5.38 cm and the breakthrough time was 138.5 h. AA-bark can be regenerated two times using HNO3 0.5 mol L−1. AA-bark can be used as a low-cost material to treat colored effluents in batch and fixed bed adsorption systems.

Adsorption of atrazine herbicide from water by diospyros kaki fruit waste activated carbon

“…Particles with heterogeneous shapes form the material surface but with a smooth surface with irregularities or cavities. This type of structure has also been observed on other materials of vegetable origin [14,37,38]. In addition, morphological changes have occurred after the pyrolysis process (Fig.…”

“…Agroindustrial residues are widely applied in adsorption studies because they have a negligible cost of obtaining them. However, most of them have a low surface area, which leads to unsatisfactory removal values [13,14]. Carbonization is one of the techniques applied since it alters the structural properties of materials, increasing the surface area [15][16][17].…”

One step acid modification of the residual bark from Campomanesia guazumifolia using H2SO4 and application in the removal of 2,4-dichlorophenoxyacetic from aqueous solution

“…[32,53] This behavior is characteristic of lignocellulosic residues and can be observed in other materials such as ashitaba, [53] Jatropha curcas pods, [54] and Araucaria Angustifolia bark. [55] In the raw material, the region around 2 theta ¼ 14 shows a small peak, which may be related to crystalline cellulose presence. [56] This region is completely amorphized after chemical treatment.…”

A Short Analysis of Biosorbents and its Potential Removal Contaminants from Aqueous Media

“…Figure 2 presents the classification for the biosorbents, which is further detailed. The tree bark has been applied for the adsorption of different dyes, such as crystal violet and red 97 [7,8]. The biosorbent from threes often present good biosorption capacity and mechanical stability.…”