GRAPHENE-BASED MATERIALS BEHAVIOUR FOR DYES ADSORPTION

2021 ◽  
pp. 103033
Author(s):  
A. Paton-Carrero ◽  
P. Sanchez ◽  
L. Sánchez-Silva ◽  
A. Romero
Keyword(s):  
Dyes Adsorption

Syntheses of magnetic GO @ melamine formaldehyde resin for dyes adsorption

2019 ◽  
Vol 6 (8) ◽  
pp. 086103 ◽  
Author(s):  
Jianxin Chen ◽  
Minghuang Jiang ◽  
Jian Han ◽  
Kaili Liu ◽  
Mengling Liu ◽  
...  
Keyword(s):  
Formaldehyde Resin ◽  
Melamine Formaldehyde ◽  
Melamine Formaldehyde Resin ◽  
Dyes Adsorption

Dyeing Adsorption Isotherm and Equilibrium Modeling Characteristics of Enzymatic and Caustic Pre-Treated Lyocell Fibers

2011 ◽  
Vol 332-334 ◽  
pp. 568-571
Author(s):  
Yi Jun Pan ◽  
Chien Teng Hsieh ◽  
Chien Kuo Yen
Keyword(s):  
Treatment Condition ◽  
Enzymatic Treatment ◽  
Equilibrium Modeling ◽  
Sorption Ability ◽  
Treatment Stage ◽  
Lyocell Fibers ◽  
Lyocell Fiber ◽  
Consequent Effect ◽  
Pre Treatment ◽  
Dyes Adsorption

The purpose of this study is to achieve a better understanding of the influences of enzymatic and caustic pretreatments on the dying adsorption behavior of Lyocell yarns. The substantivity behavior, dyeing adsorption isotherms and their correlation between the equilibrium modeling and equilibrium isotherm parameters of the pre-treated Lyocell fibers have been studied. Although the conditions of each treatment were the same, changing the processing sequences caused substantially different modifications on the Lyocell fiber fine structure with consequent effect on dyeing behaviors. In general, pretreatment by caustic soda and/or enzyme can improve their dyeability of Lyocell fibers. The results of dyes adsorption show that for the same enzymatic treatment condition if the enzymatic treatment stage is applied before the caustic pre-treatment, the dyeability and sorption ability of small molecule dye on pre-treated Lyocell can be improved over that which can be obtained for caustic pre-treated yarn.

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

2003 ◽  
Vol 38 (2) ◽  
pp. 393-411 ◽  
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.

scholarly journals Carbon Nanotubes Hybrid Hydrogels for Environmental Remediation: Evaluation of Adsorption Efficiency under Electric Field

Molecules ◽  
2021 ◽  
Vol 26 (22) ◽  
pp. 7001
Author(s):  
Giuseppe Cirillo ◽  
Manuela Curcio ◽  
Lorenzo Francesco Madeo ◽  
Francesca Iemma ◽  
Giovanni De De Filpo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electric Field ◽  
Environmental Remediation ◽  
Kinetic Studies ◽  
Surface Thermodynamics ◽  
Ph Variation ◽  
Hybrid Hydrogels ◽  
Hydrogel Network ◽  
Dyes Adsorption ◽  
Influence Of Ph

The performance of Carbon Nanotubes hybrid hydrogels for environmental remediation was investigated using Methylene Blue (MB), Rhodamine B (RD), and Bengal Rose (BR) as model contaminating dyes. An acrylate hydrogel network with incorporated CNT was synthesized by photo-polymerization without any preliminary derivatization of CNT surface. Thermodynamics, isothermal and kinetic studies showed favorable sorption processes with the application of an external 12 V electric field found to be able to influence the amount of adsorbed dyes: stronger interactions with cationic MB molecules ( and of 19.72 and 33.45 mg g−1, respectively) and reduced affinity for anionic RD ( and of 28.93 and 13.06 mg g−1, respectively) and neutral BR ( and of 36.75 and 15.85 mg g−1, respectively) molecules were recorded. The influence of pH variation on dyes adsorption was finally highlighted by reusability studies, with the negligible variation of adsorption capacity after five repeated sorption cycles claiming for the suitability of the proposed systems as effective sorbent for wastewater treatment.

Concurrent dyes adsorption and photo-degradation on fly ash based substrates

Adsorption ◽  
2010 ◽  
Vol 17 (1) ◽  
pp. 101-108 ◽  
Author(s):  
M. Visa ◽  
L. Andronic ◽  
D. Lucaci ◽  
A. Duta
Keyword(s):  
Fly Ash ◽  
Photo Degradation ◽  
Dyes Adsorption

Kinetics, equilibrium and thermodynamics of dyes adsorption onto modified chitosan: a review

2021 ◽  
Vol 235 (11) ◽  
pp. 1499-1538
Author(s):  
Abida Kausar ◽  
Kashaf Naeem ◽  
Munawar Iqbal ◽  
Zill-i-Huma Nazli ◽  
Haq N. Bhatti ◽  
...  
Keyword(s):  
Dye Adsorption ◽  
Thermodynamic Characteristics ◽  
Modified Chitosan ◽  
Chemical Structures ◽  
Highly Efficient ◽  
Adsorption Capacities ◽  
Variable Chemical ◽  
Modified Adsorbents ◽  
Dyes Adsorption

Abstract In view of promising sorption capacity, stability, biodegradability, cost-effectiveness, environmental friendly nature, regeneration and recycling ability, the chitosan (CS) based adsorbents are highly efficient for the sequestration of dyes. Since CS offers variable chemical structures and CS have been modified by incorporating different moieties. The CS composites with unique properties have been employed successfully for dye adsorption with reasonably high adsorption capacity versus other similar adsorbents. Modifications of CS were promising for the preparation of composites that are extensively studied for their adsorption capacities for various dyes. This review highlights the CS and its modification and their applications for the adsorption of dyes. The removal capacities of CS-based adsorbents, equilibrium modeling, kinetics studies and the thermodynamic characteristics are reported. Moreover, the FTIR, BET, SEM, TGA and XRD were employed for the characterization of CS modified adsorbents are also discussed. Results revealed that the modified CS is highly efficient and can be employed for the sequestration of dyes from effluents.

scholarly journals Pineapple Bark Performance in Dyes Adsorption: Optimization by the Central Composite Design

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Ahlam Fegousse ◽  
Abdelali El Gaidoumi ◽  
Youssef Miyah ◽  
Rabea El Mountassir ◽  
Anissa Lahrichi
Keyword(s):  
Central Composite Design ◽  
Design Methodology ◽  
Brilliant Green ◽  
Optimal Conditions ◽  
Initial Concentration ◽  
Dyes Adsorption ◽  
Experimental Design Methodology ◽  
Central Composite ◽  
Adsorbent Dose ◽  
Scanning Electron

This work is concerned with the study of the adsorption in aqueous medium of a three-dye mixture which contains Methylene Blue, Brilliant Green, and Congo Red on the pineapple bark. This adsorbent material has been characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The experimental design methodology, based on the response surface methodology (RSM) by the central composite design (CCD), has been applied for the optimization of the parameters, namely, the temperature, dose of the adsorbent, and pH. The yield reached 98.91% under optimal conditions (T = 30°C; adsorbent dose = 2.5 g·L−1; pH = 9.8) at an initial concentration of 20 mg·L−1.

scholarly journals Dyes Adsorption Behavior of Fe3O4 Nanoparticles Functionalized Polyoxometalate Hybrid

Molecules ◽  
2019 ◽  
Vol 24 (17) ◽  
pp. 3128 ◽  
Author(s):  
Jie Li ◽  
Chen Si ◽  
Haiyan Zhao ◽  
Qingxi Meng ◽  
Bowen Chang ◽  
...  
Keyword(s):  
Adsorption Kinetics ◽  
Removal Rate ◽  
Aqueous System ◽  
Blocking Temperature ◽  
Isotherm Models ◽  
Zero Field ◽  
Magnetic Adsorbent ◽  
Anionic Dyes ◽  
Desorption Process ◽  
Dyes Adsorption

The magnetic adsorbent, Fe3O4@[Ni(HL)2]2H2[P2Mo5O23]·2H2O (Fe3O4@1), is synthesized by employing the nanoparticles Fe3O4 and polyoxometalate hybrid 1. Zero-field-cooled (ZFC) and field-cooled (FC) curves show that the blocking temperature of Fe3O4@1 was at 120 K. Studies of Fe3O4@1 removing cationic and anionic dyes from water have been explored. The characterization of Fe3O4@1, effects of critical factors such as dosage, the concentration of methylene blue (MB), pH, adsorption kinetics, isotherm, the removal selectivity of substrate and the reusability of Fe3O4@1 were assessed. The magnetic adsorbent displayed an outstanding removal activity for the cationic dye at a broad range of pH. The adsorption kinetics and isotherm models revealed that the adsorption process of Fe3O4@1 was mainly governed via chemisorption. The maximum capacity of Fe3O4@1 adsorbing substance was 41.91 mg g−1. Furthermore, Fe3O4@1 showed its high stability by remaining for seven runs of the adsorption-desorption process with an effective MB removal rate, and could also be developed as a valuable adsorbent for dyes elimination from aqueous system.

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