Abstract
This research evaluated the biosorption potential of the 134% Yellow Reafix BR2 dye by the malt bagasse. Tests were conducted at batch conditions, under controlled agitation, pH, and temperature. The biosorbent was characterized through scanning electron microscopy and Fourier transform infrared spectroscopy, before and after biosorption. Malt bagasse presented a point of zero charge at 6.75. In the process variables evaluation, there was a greater biosorption potential in acidic pH, without a significant influence of size on the biosorbent particles. The equilibrium time was achieved in 360 min, with approximately 93% removal at the evaluated temperatures. The experimental data were best represented by the pseudo-second-order model. Biosorption was characterized as spontaneous and endothermic, with indicative of physical. Considering the equilibrium, the Langmuir isotherm was the one that best fit the experimental data, with a maximum biosorption capacity of 68.75 mg g–1 (at 303 K and pH 2). The removal suffered no significant interference with the presence of another dye nor with the increase of ionic strength. Thus, the malt bagasse shows potential to be used as a biosorbent in treatment systems of industrial effluents.
Highlights
Water resources are essential for the maintenance of life and biodiversity on our planet
We found that pHpzc was 6.75 – indicating that, if the pH of the solution is below this value, the surface of the material is positively charged
This study aimed at evaluating the biosorption of the Yellow Reafix B2R dye using the malt bagasse as biosorbent
Summary
Water resources are essential for the maintenance of life and biodiversity on our planet. Several anthropogenic activities contribute to the degradation of water quality, especially due to the incorrect arrangement of sewers and disposals. The industrial activity corresponds to 22% of the consumption of fresh water. Several legislations are in force to ensure the correct disposal of these effluents. Over 80% of wastewaters are estimated to still be disposed of without proper treatment (WWAP, 2017)
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