Biosorption of reactive yellow dye by malt bagasse

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.

Adsorption characteristics of atrazine on different soils in the presence of Cd(II)

“…Atrazine is a weak alkaline pesticide with a protein kinase A (pKa) of 1.64. When the pH value of the soil is close to pKa, most of atrazine exists in the form of cations (Da Silva et al., 2019), the number of protons in the solution increases, and the protonation is enhanced. The adsorption capacity of atrazine is better when the ion exchange is the main adsorption mechanism.…”

From Waste to Biosorbent: Removal of Congo Red from Water by Waste Wood Biomass

“…Nacu [28] reported that the texture properties of sawdust and bark of different tree species are characterized by the presence of micro-, meso-, and macro-pores, with the predominant mesoporous structure of waste wood biomass. The described morphology favorably affects the binding of adsorbate molecules [29].…”

“…ater 2021, 13, x FOR PEER REVIEW are characterized by the presence of micro-, meso-, and macro-pores, with nant mesoporous structure of waste wood biomass. The described morpho affects the binding of adsorbate molecules [29]. Qualitative analysis of specific functional groups on the biosorbent s affect the efficiency of the biosorption process, is commonly performed u method.…”

Evaluation of Cocoa Beans Shell Powder as a Bioadsorbent of Congo Red Dye Aqueous Solutions

“…The processing of raw materials into finished products requires large amounts of water, which are discharged into seas and rivers after processing, with varying degrees of contamination. In particular, the water contaminated by synthetic dyes comes from various industrial activities; among them, the food, leather, textile, paper, medicine, cosmetic, printing-ink, varnish, paint, oil, and soap industries stand out [ 1 , 2 , 3 , 4 , 5 ]. The textile and food industries alone dispose of between 10% and 20% of the contaminants that impart color to water during their production processes [ 6 ], thus constituting a challenge for water treatment [ 7 ].…”

“…Their main effect as pollutants is that they limit photosynthetic activity as a result of the decrease in light, causing the death of flora [ 12 ]. In addition, the oxidation of the dye consumes dissolved oxygen, so it directly affects the respiratory activity of aquatic organisms [ 4 ]. Due to their mostly aromatic molecular structures, synthetic dyes are recalcitrant to biodegradation [ 13 ].…”