A novel natural lignocellulosic biosorbent of sunflower stem-pith for textile cationic dyes adsorption

Abstract In this work, the ability of chrome shavings and of crust leather buffing dusts to remove dyes from aqueous solutions has been studied. Buffing dusts proved to be a much better adsorbent than chrome shavings for cationic dyes. The adsorption of anionic dyes is very important on two studied wastes. The pH has an obvious influence on the adsorption of dyes. Adsorption of cationic dyes is less favourable under acidic conditions (pH <3.5) and at high pH values (pH >10.5). The adsorption of anionic dyes on both adsorbents is more favourable under acidic conditions (pH <3). The adsorption on chrome shavings is improved by the use of finer particles. The kinetic adsorption was also studied. Adsorption isotherms, at the optimum operating conditions, were determined. Adsorption follows the Langmuir model. The isotherm parameters have been calculated. The column technique could be applied to treat significant volumes of solutions.

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Synthesis of an efficient hydroxyapatite–chitosan–montmorillonite thin film for the adsorption of anionic and cationic dyes: adsorption isotherm, kinetic and thermodynamic study

SN Applied Sciences ◽

10.1007/s42452-020-2848-3 ◽

2020 ◽

Vol 2 (6) ◽

Author(s):

M. Joudi ◽

H. Nasserlah ◽

H. Hafdi ◽

J. Mouldar ◽

B. Hatimi ◽

...

Keyword(s):

Thin Film ◽

Adsorption Isotherm ◽

Thermodynamic Study ◽

Cationic Dyes ◽

Dyes Adsorption ◽

Kinetic And Thermodynamic Study

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Synthesis and characterization of a novel amphoteric adsorbent coating for anionic and cationic dyes adsorption: Experimental investigation and statistical physics modelling

Chemical Engineering Journal ◽

10.1016/j.cej.2018.06.092 ◽

2018 ◽

Vol 351 ◽

pp. 221-229 ◽

Cited By ~ 40

Author(s):

Syahida Farhan Azha ◽

Lotfi Sellaoui ◽

Muhamad Sharafee Shamsudin ◽

Suzylawati Ismail ◽

Adrián Bonilla-Petriciolet ◽

...

Keyword(s):

Experimental Investigation ◽

Statistical Physics ◽

Cationic Dyes ◽

Synthesis And Characterization ◽

Dyes Adsorption

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One-step synthesis of Cu(II) metal–organic gel as recyclable material for rapid, efficient and size selective cationic dyes adsorption

Journal of Environmental Sciences ◽

10.1016/j.jes.2019.06.006 ◽

2019 ◽

Vol 86 ◽

pp. 203-212 ◽

Cited By ~ 6

Author(s):

Qing Wu ◽

Li He ◽

Zhong Wei Jiang ◽

Yang Li ◽

Ting Ting Zhao ◽

...

Keyword(s):

Cationic Dyes ◽

Metal Organic ◽

One Step ◽

Dyes Adsorption ◽

Organic Gel

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A Comparative Analysis of the Global Electrophilicity Power of Some Cationic Dyes. Understanding Selective Removal Dyes From Mixture Solution

Letters in Applied NanoBioScience ◽

10.33263/lianbs104.29332944 ◽

2021 ◽

Vol 10 (4) ◽

pp. 2933-2944

Keyword(s):

Dft Calculations ◽

Cationic Dyes ◽

Anionic Sites ◽

Electrophilicity Index ◽

Fukui Functions ◽

Reactive Adsorption ◽

Adsorption Sites ◽

Adsorbent Surface ◽

Dyes Adsorption ◽

Mixture State

Some bibliographic findings of dyes' adsorption from a mixture state suggest that certain dyes are more likely to be adsorbed first on the adsorbent surface than others, and therefore attracted strongly to the adsorbent surface. To explain the phenomenon, DFT calculations are applied. In this fact, the global electrophilicity index ω of some cationic dyes has been evaluated. The results show that, for studied electrophilic dyes, the molecule with the greatest global electrophilicity power is favored to be adsorbed on the surface's anionic sites. In addition, local electrophilic Parr and Fukui functions were introduced to characterize the most reactive adsorption sites properly and indicate successfully the same adsorption centers. The success of DFT calculations in explaining and predicting the selective dye was assessed.

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