Cellulose nanowhiskers improve the methylene blue adsorption capacity of chitosan-g-poly(acrylic acid) hydrogel

Melo, Bruno C.; Paulino, Francisco A.A.; Cardoso, Varneir A.; Pereira, Antonio G.B.; Fajardo, André R.; Rodrigues, Francisco H. A.

doi:10.1016/j.carbpol.2017.10.079

Cited by 206 publications

(77 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Bonding strengths values of <84kJ mol À1 are typically considered as to represent physisorption bonds (Melo et al, 2018). Chemisorption bond strengths may have values of 84-420 kJ mol À1 (Faust and Aly, 1988).…”

Section: Thermodynamic Resultsmentioning

confidence: 99%

RETRACTED: Preparation and characterization of activated carbons from winemaking wastes and their adsorption of methylene blue

Alcaraz

Fernández

García‐Díaz

et al. 2018

Adsorption Science & Technology

View full text Add to dashboard Cite

This work reports the preparation of activated carbons via the hydrothermal treatment at 523 K/30 bar of two common winemaking wastes: bagasse and cluster stalks. The hydrothermal carbons produced by the above treatment were turned into activated carbons via their exposure to KOH and carbonization at 1073 K. These were then subjected to Raman spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy examination, and the determination of their Brunauer-Emmett-Teller surface area. The ability of the activated carbons to adsorb methylene blue in aqueous solution was then examined, determining the influence of time, methylene blue concentration, and temperature. Equilibrium conditions were reached for reaction times between 180 and 240 min at pH 7. The adsorption isotherms were found to better fit the Langmuir than the Freundlich model, and the adsorption kinetics fitted a pseudo-second-order model. The maximum adsorption at 303 K was 714-847 mg g À1. Thermodynamic studies revealed the adsorption of methylene blue to be spontaneous and exothermic. These results show that high-quality activated carbons can be produced from winemaking waste.

show abstract

Section: Thermodynamic Resultsmentioning

confidence: 99%

RETRACTED: Preparation and characterization of activated carbons from winemaking wastes and their adsorption of methylene blue

Alcaraz

Fernández

García‐Díaz

et al. 2018

Adsorption Science & Technology

View full text Add to dashboard Cite

show abstract

“…The plot in Figure reveals a very good performance of our eutectogel, which reaches 1930 mg/g at high concentration of dye 479 mg/L. The increase in adsorption capacity by lowering the amount of gel has been previously reported in the literature …”

Section: Resultssupporting

confidence: 77%

“…The increase in adsorption capacity by lowering the amount of gel has been previously reported in the literature. [32] Our eutectogel results competitive with respect to recent systems reported in the literature also by considering Q e values. For instance, it exceeds the values obtained in the presence of the same dye with organogels [33] and metal organic frameworks [31] (1200 mg/g and 1000 mg/g, respectively), approaching the highest value so far reported for the removal of a cationic dye by a polymeric gel, 2100 mg/g.…”

Section: Dye Removal By Adsorptionsupporting

confidence: 73%

Environmentally Friendly Eutectogels Comprising l‐amino Acids and Deep Eutectic Solvents: Efficient Materials for Wastewater Treatment

et al. 2020

View full text Add to dashboard Cite

Current concerns for sustainability and the environment make low‐impact materials desirable for environmental remediation and, in particular wastewater treatment. We obtained supramolecular gels of l‐amino acids in the deep eutectic solvent formed by choline chloride and phenylacetic acid. After gel characterization, and investigating gel–sol transition temperatures, gelation kinetics, rheological properties, and morphology, the gels were applied as sorbents to remove cationic dyes from aqueous solutions. The effects of the pH, dye nature, volume, and concentration of wastewater were analyzed, and the best result was obtained with a l‐phenylalanine‐based eutectogel. It can be reused for at least 9 times without losing efficiency, also with dye mixtures. Interestingly, this gel can be loaded onto columns to decolorize flowing solutions, achieving 85 % of removal efficiency in only 10 minutes and allowing its reuse for at least 4 cycles. In terms of adsorption capacity, this eutectogel is competitive with efficient gel‐based dye sorbent systems, with a value 1930 mg/g reached at a high concentration of rhodamine B 479 mg/L.

show abstract

“…4 and 5, respectively) were used. The pseudo-first-order model assumes that the external diffusion mass transfer is the ratelimiting step [26] while the pseudo-second-order model supposes that chemisorption at adsorption sites rules the adsorption process [27,28].…”

Section: Effects Of Different Conditions On Mb Adsorptionmentioning

confidence: 99%

Fabrication, characterization, and dye adsorption capability of recycled modified polyamide nanofibers

et al. 2018

View full text Add to dashboard Cite

U TILIZATION of electrospinning technique accompanied by chemical modification as well as, the production of low-cost adsorbent based on polyamide nanofibers is the aim of our current work. The electrospinning parameters (polymer conc, applied voltage, and collector distance) have been studied. The obtained polyamide nanofiber mats were modified with citric acid at various conditions (concentration, temperature and catalyst concentration). The optimum conditions of this modification were investigated by MB uptake efficiency. The obtained data illustrate a positive relationship between citric acid concentration and MB uptake using the modified polyamide nanofiber. The produced adsorbent was well characterized using SEM, ATR-FTIR, and surface area measurement. Scanning Electron Microscopy clarifies minor swelling of nanofibers during the modification process which attributed to the increase in fiber diameter and therefore reduction in the fiber surface area. The adsorption performance of the nanofiber mat was assessed as a function of pH, nanofiber mat dosage, contact time, and initial dye concentration. Kinetics and isotherms analysis were investigated as well. The MB separation capability of the modified PA-nanofiber was considerably higher than that of the PAnanofiber. The kinetic data of both nanofiber mat was better fitted with the pseudo-second-order model. Also, the equilibrium data of PA-nanofiber was better fitted with Freundlich model and Langmuir model in case of the modified PA-nanofiber. The adsorption behavior was favorable chemisorption process as inferred from the kinetics, and the isotherms studies. The results of this study promote the modified PA-nanofiber as a potential adsorption filters for dyeing wastewater decolourization.

show abstract

Cellulose nanowhiskers improve the methylene blue adsorption capacity of chitosan-g-poly(acrylic acid) hydrogel

Cited by 206 publications

References 66 publications

RETRACTED: Preparation and characterization of activated carbons from winemaking wastes and their adsorption of methylene blue

RETRACTED: Preparation and characterization of activated carbons from winemaking wastes and their adsorption of methylene blue

Environmentally Friendly Eutectogels Comprising l‐amino Acids and Deep Eutectic Solvents: Efficient Materials for Wastewater Treatment

Fabrication, characterization, and dye adsorption capability of recycled modified polyamide nanofibers

Contact Info

Product

Resources

About