Selective, efficient and complete precipitation of anionic dyes in aqueous solutions using Ag@PbCO3 nanocomposite

Hydrogel beads based on the husk of agarwood fruit (HAF)/sodium alginate (SA), and based on the HAF/chitosan (CS) were developed for the removal of the dyes, crystal violet (CV) and reactive blue 4 (RB4), in aqueous solutions, respectively. The effects of the initial pH (2–10) of the dye solution, the adsorbent dosage (0.5–3.5 g/L), and contact time (0–540 min) were investigated in a batch system. The dynamic adsorption behavior of CV and RB4 can be represented well by the pseudo-second-order model and pseudo-first-order model, respectively. In addition, the adsorption isotherm data can be explained by the Langmuir isotherm model. Both hydrogel beads have acceptable adsorption selectivity and reusability for the study of selective adsorption and regeneration. Based on the effectiveness, selectivity, and reusability of these hydrogel beads, they can be treated as potential adsorbents for the removal of dyes in aqueous solutions.

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Removal of Dyes from Aqueous Solutions by Adsorption on Chrome-Tanned Solid Wastes Generated in the Leather Industry

Water Quality Research Journal ◽

10.2166/wqrj.2003.025 ◽

2003 ◽

Vol 38 (2) ◽

pp. 393-411 ◽

Cited By ~ 18

Author(s):

Soufiane Tahiri ◽

Ali Messaoudi ◽

Abderrahman Albizane ◽

Mohamed Azzi ◽

Mohamed Bouhria ◽

...

Keyword(s):

Aqueous Solutions ◽

Operating Conditions ◽

Solid Wastes ◽

Cationic Dyes ◽

Optimum Operating ◽

Leather Industry ◽

Anionic Dyes ◽

Ph Values ◽

Acidic Conditions ◽

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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Cover Feature: An Unprecedented Interpenetrating Structure Built from Two Differently Bonded Frameworks: Synthesis, Characteristics, and Efficient Removal of Anionic Dyes from Aqueous Solutions (Chem. Eur. J. 33/2019)

Chemistry - A European Journal ◽

10.1002/chem.201901756 ◽

2019 ◽

Vol 25 (33) ◽

pp. 7774-7774

Author(s):

Chih‐Ling Wang ◽

Jui Hsieh ◽

Li‐Wei Lee ◽

Jing‐Yun Wu ◽

Pu‐Yen Hsiao ◽

...

Keyword(s):

Aqueous Solutions ◽

Efficient Removal ◽

Anionic Dyes

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Orange-based and Lemon-based Adsorbents with Controlled Grain for an Efficient Elimination of Cationic and Anionic Dyes from Textile Dyeing Wastewater

10.21203/rs.3.rs-177945/v1 ◽

2021 ◽

Author(s):

G. Pascual ◽

M. Riba-Moliner ◽

J. M. Canal ◽

J. Garcia-Raurich

Keyword(s):

Aqueous Solutions ◽

Industrial Process ◽

Operating Conditions ◽

Dyeing Wastewater ◽

Anionic Dyes ◽

Chemically Modified ◽

Natural Adsorbents ◽

Textile Dyeing ◽

Efficient Elimination ◽

Textile Dyeing Wastewater

Abstract Physically and chemically modified orange and lemon mesocarps are used as natural adsorbents for both cationic and anionic dyes from wastewaters of textile dyeing industry. Adsorptivity of the orange-based and lemon-based adsorbents to the dyes are studied simulating a batch and a continuous industrial process. Thus, the most suitable operating conditions to achieve the maximum adsorption yield are provided. Results demonstrate that treated orange and lemon mesocarps can be used as excellent reusable adsorbents to the removal of cationic and anionic dyes from aqueous solutions. Moreover, the recovery of the adsorbed dye is also reliable and proved.

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Equilibrium, Kinetic, and Thermodynamic Studies of Anionic Dyes Adsorption on Corn Stalks Modified by Cetylpyridinium Bromide

Colloids and Interfaces ◽

10.3390/colloids3010004 ◽

2018 ◽

Vol 3 (1) ◽

pp. 4 ◽

Cited By ~ 5

Author(s):

Liudmyla Soldatkina ◽

Marianna Zavrichko

Keyword(s):

Experimental Data ◽

Aqueous Solutions ◽

Cationic Surfactant ◽

Kinetic Studies ◽

Batch Adsorption ◽

Cetylpyridinium Bromide ◽

Anionic Dyes ◽

Pseudo Second Order ◽

Dyes Adsorption

Corn stalks (CS) were modified by a cationic surfactant, cetylpyridinium bromide (CPB), and used as an adsorbent (CS-CP) to remove anionic dyes [Acid Red (AR) and Acid Orange (AO)] from aqueous solutions. The FTIR analysis and the obtained calculations based on the determination of the adsorption capacity of CS towards CPB confirmed that the cationic surfactant had been adsorbed on the surface of corn stalks. Adsorption of the anionic dyes on modified corn stalks was investigated in a series of batch adsorption experiments at 303–328 K. The adsorption data were analyzed using Langmuir, Freundlich, and Temkin models. The Langmuir model was found to be more suitable for the experimental data of the anionic dyes on CS-CP than other adsorption models. Kinetic studies revealed that the pseudo-second order model showed the best fit to the experimental data. The thermodynamic parameters indicated that the adsorption process was spontaneous and exothermic. Mechanisms involving ion exchange and chemisorption might be responsible for the uptake of the anionic dyes on CS-CP. Obtained results imply that CS-CP could be applied as an effective adsorbent to remove anionic dyes from aqueous solutions.

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