Basic-dye adsorption in albedo residue: Effect of pH, contact time, temperature, dye concentration, biomass dosage, rotation and ionic strength

Silva, Carlos Eduardo de Farias; Gama, Brígida Maria Villar da; Gonçalves, Andreza Heloiza da Silva; Medeiros, Josimayra Almeida; Abud, Ana Karla de Souza

doi:10.1016/j.jksues.2019.04.006

Cited by 33 publications

(14 citation statements)

References 41 publications

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“…Analysis of the results. Studying the morphology and the chemical structure of the adsorbents after adsorption is necessary to understand the mechanisms of MB adsorption onto the adsorbents [32][33][34] . For these reasons, SEM, FTIR, and CHN as well as bulk and particle densities were examined for the olive stones involved in the adsorption process of MB.…”

Section: Adsorbents Collection and Preparation Two Representative Samentioning

confidence: 99%

“…The relationship between temperature and K L is shown in the following formula known as Van't Hoff equation Eq. (4):where a plot of lnK L vs. 1/T can be used to determine the values of ∆H° and ∆S° from the slope and intercept 32,[35][36][37] .…”

Section: Adsorbents Collection and Preparation Two Representative Samentioning

confidence: 99%

“…This is due to the fact that opposite electrostatic charges attract, while equal electrostatic charges repel. In an environmental adsorption clean-up method, it is important to study the effect of the solution pH on the extent of removal of the pollutant by the adsorbent 32,47 . www.nature.com/scientificreports/ For these reasons, the effect of the solution pH was the first parameter tested for the adsorption of MB onto the green and black olive stones.…”

Section: Adsorption Isotherms Effect Of the Solution Ph On The Mb Admentioning

confidence: 99%

“…An increase in the adsorption capacity with temperature indicates an endothermic adsorption process, while a decrease in the adsorption capacity with increasing temperature indicates an exothermic process. Temperature plays an important role in controlling the strength of the adsorptive forces between the adsorbent and adsorbate molecules 32,33 . The effect of temperature on the remediation of MB onto the green and black olive stones was studied under 25, 35, and 45 °C.…”

Section: Adsorption Isotherms Effect Of the Solution Ph On The Mb Admentioning

confidence: 99%

“…The adsorption isotherms describe the relationship at the equilibrium of the amount of the adsorbed material onto the adsorbent (q e ) and the equilibrium concentration in the bulk fluid (C e ) at constant temperature and pH. Therefore, the critical optimization of the pathways of adsorption mechanisms, capacities, and surface properties of adsorbents, as well as adsorption systems can be achieved 32,64 . For these reasons, four isotherm models are known as Langmuir, Freundlich, Dubinin-Radushkevish, and Temkin were tested to determine the applicability of the green and black olive stones in remediating MB from water.…”

Section: Adsorption Isotherms Effect Of the Solution Ph On The Mb Admentioning

confidence: 99%

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Mechanistic understanding of the adsorption and thermodynamic aspects of cationic methylene blue dye onto cellulosic olive stones biomass from wastewater

Al-Ghouti

Al-Absi

2020

Sci Rep

221

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In the current study, the mechanistic understanding of the adsorption isotherm and thermodynamic aspects of cationic methylene blue (MB) dye adsorption onto cellulosic olive stones biomass from wastewater were investigated. The batch adsorption of MB onto the olive stones (black and green olive stones) was tested at a variety of pH, dye concentrations, temperatures, and biomass particle sizes. The adsorption thermodynamics such as Gibbs free energy, enthalpy, and entropy changes were also calculated. Moreover, the desorption studies of MB from the spent olive stones were studied to explore the re-usability of the biomasses. The results revealed that under the optimum pH of 10, the maximum MB uptake was achieved i.e. 80.2% for the green olive stones and 70.9% for the black olive stones. The green olive stones were found to be more efficient in remediating higher MB concentrations from water than the black olive stones. The highest MB removal of the green olive stones was achieved at 600 ppm of MB, while the highest MB removal of the black olive stones was observed at 50 ppm of MB. Furthermore, for almost all the concentrations studied (50–1000 ppm), the MB adsorption was the highest at the temperature of 45 °C (P value < 0.05). It was shown by the Fourier transform infrared that the electrostatic interaction and hydrogen bonding were proposed as dominant adsorption mechanisms at basic and acidic pH, respectively. While the hydrophobic-hydrophobic interaction was a dominant mechanism at neutral pH. The thermodynamic studies revealed that the adsorption process was endothermic, spontaneous, and favorable. Moreover, the real wastewater experiment and the desorption studies showed that the green and black olive stones were a cost-effective and promising adsorbents for MB remediation from wastewater on account of their high adsorption and desorption removal capacities.

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Section: Adsorbents Collection and Preparation Two Representative Samentioning

confidence: 99%

Section: Adsorbents Collection and Preparation Two Representative Samentioning

confidence: 99%

Section: Adsorption Isotherms Effect Of the Solution Ph On The Mb Admentioning

confidence: 99%

Section: Adsorption Isotherms Effect Of the Solution Ph On The Mb Admentioning

confidence: 99%

Section: Adsorption Isotherms Effect Of the Solution Ph On The Mb Admentioning

confidence: 99%

See 3 more Smart Citations

Mechanistic understanding of the adsorption and thermodynamic aspects of cationic methylene blue dye onto cellulosic olive stones biomass from wastewater

Al-Ghouti

Al-Absi

2020

Sci Rep

221

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Agri‐residual waste, wheat bran as a biosorbent for mitigation of dye pollution in industrial wastewaters

2021

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In the current investigation, a comparison of mitigation of industrial-grade, Dispersive Dark Red (DDR) (93.55%), Disperse Orange (DO) (93.48%) and lab grade, Malachite Green (MG) (95.25%), and Congo Red (CR) (97.02%) dyes using biosorptive ability of wheat bran (WB) (efficient, economical, readily available and environment-friendly adsorbent) has been reported. WB obtained from wheat (a type of grass plant, a major human food crop), is a waste product generated from agricultural practices. The effect of different variables, namely, pH, adsorbate concentration, incubation time, adsorbent dosage, and temperature were investigated to determine the optimal parameters for dye sorption. The influence of the chemical modification of the sorbent on its adsorption capacity was also tested, which showed a positive effect of acid modification towards acidic dyes and vice versa towards the basic dyes. For all the dyes, in comparison to the Freundlich model, nonlinear Langmuir model of isotherm has given better conformity, with maximum adsorption capacity of 11.14 (MG), 15.17 (CR), 12.34 (DDR), and 15.98 (DO) mg/g at their respective optimal temperature following a pseudo-second-order kinetic model for adsorption, proving it to be dependent on adsorption capacity of WB. The findings clearly suggest WB to be an efficient dye remover from aqueous solutions and can, thus, be well explored for dye pollution reduction in industrial wastewaters. K E Y W O R D S chemical dyes, environment pollution, plant waste, water treatment, wheat bran 1 | INTRODUCTION Water pollution by chemical-based dyes (along with other chemicals employed in different industrial processes), is a cause of concern in textile industry as these are often associated with toxicity, mutagenicity, carcinogenicity [1,2], and genotoxicity [3]. The textile industry is a major chemical-based, water-[4] and energyintensive industry, which uses dyes for coloring textile fabrics. Apart from other textile wet processing steps like, desizing and scouring, that use chemicals, fabric dyeing is one of the most problematic steps, with unbound dyes being released into the wastewater. The wastewater, rich in metal ions, acids, bases, salts, and chemical dyes

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Modified or Functionalized Natural Bioadsorbents: New Perspectives as Regards the Elimination of Environmental Pollutants

Daza-López

Fernández-Andrade

Nóbrega

et al. 2021

Environmental and Microbial Biotechnology

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Basic-dye adsorption in albedo residue: Effect of pH, contact time, temperature, dye concentration, biomass dosage, rotation and ionic strength

Cited by 33 publications

References 41 publications

Mechanistic understanding of the adsorption and thermodynamic aspects of cationic methylene blue dye onto cellulosic olive stones biomass from wastewater

Mechanistic understanding of the adsorption and thermodynamic aspects of cationic methylene blue dye onto cellulosic olive stones biomass from wastewater

Agri‐residual waste, wheat bran as a biosorbent for mitigation of dye pollution in industrial wastewaters

Modified or Functionalized Natural Bioadsorbents: New Perspectives as Regards the Elimination of Environmental Pollutants

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