Fabrication of GO-MnO2 Nanocomposite using Hydrothermal Process for Cationic and Anionic Dyes Adsorption: Kinetics, Isotherm, and Reusability

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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Effect of The Surfactant Loaded Amount Into The Bentonite on The Elimination of Two Anionic Dyes: Adsorption, Kinetics, and Isotherm Studies

10.21203/rs.3.rs-306511/v1 ◽

2021 ◽

Author(s):

Brahim Guezzen ◽

Mehdi Adjdir ◽

Abdelkader Elaziouti ◽

Mohamed Amine Didi

Keyword(s):

Adsorption Capacity ◽

Adsorption Kinetics ◽

Indigo Carmine ◽

Exchange Capacity ◽

Hexadecyltrimethylammonium Bromide ◽

Anionic Dyes ◽

Intra Particle Diffusion ◽

Pseudo Second Order ◽

Dyes Adsorption ◽

Adsorption Kinetics And Isotherm

Abstract The present work focused on the preparation of hybrid-bentonite adsorbents by treating sodium bentonite (Na-B) with different amounts of hexadecyltrimethylammonium bromide (HDTMA+ Br-), corresponding to 50, 100 and 200% the value of the cation exchange capacity (CEC). The samples prepared, namely 50HDTMA-B, 100HDTMA and 200HDTMA-B, were characterized by different techniques including Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA ). The removal efficiency of two anionic dyes, namely. Congo Red (CR) and Indigo Carmine (IC), from aqueous solutions, was studied as a function of the amount of HDTMA, contact time, hybrid adsorbent and initial dye concentration. In addition, a kinetic study was conducted to fit the experimental data in order to compare the adsorption rate constants and the equilibrium sorption capacities of anionic dyes on the prepared materials. The results obtained indicated that the adsorption kinetics of clay samples could be best described by the pseudo-second-order model, and the adsorption capacity of the hybrid-Bentonite is affected by the amount of modifier used. Based on Weber-Morris intra-particle diffusion equation, it was found that the CR and IC dyes diffused faster as the cationic surfactant loading increased from 0 to 100% of the CEC value. The Langmuir isotherm exhibited the best fit, with an adsorption capacity equal to 292 and 289 mg g-1, for CR and IC dyes, respectively.

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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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Adsorption kinetics and isotherm of anionic dyes onto organo-bentonite from single and multisolute systems

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2009.06.139 ◽

2009 ◽

Vol 172 (1) ◽

pp. 99-107 ◽

Cited By ~ 134

Author(s):

Dazhong Shen ◽

Jianxin Fan ◽

Weizhi Zhou ◽

Baoyu Gao ◽

Qinyan Yue ◽

...

Keyword(s):

Adsorption Kinetics ◽

Anionic Dyes ◽

Adsorption Kinetics And Isotherm

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Hydrothermal Synthesis of Ultra-Light Coal-Based Graphene Oxide Aerogel for Efficient Removal of Dyes from Aqueous Solutions

Nanomaterials ◽

10.3390/nano8090670 ◽

2018 ◽

Vol 8 (9) ◽

pp. 670 ◽

Cited By ~ 11

Author(s):

You Lv ◽

Baolin Xing ◽

Mingkun Zheng ◽

Guiyun Yi ◽

Guangxu Huang ◽

...

Keyword(s):

Graphene Oxide ◽

Hydrothermal Process ◽

Cost Effective ◽

Anionic Dyes ◽

High Mechanical Strength ◽

Adsorption Sites ◽

Adsorption Capacities ◽

Monolayer Adsorption ◽

Drying Treatment ◽

Graphene Oxide Aerogel

A novel carboxymethyl cellulose (CMC)-supported graphene oxide aerogel (CGOA) was fabricated from a cost-effective and abundant bituminous coal by a mild hydrothermal process and freeze-drying treatment. Such an aerogel has cross-linked graphene oxide layers supported by CMC, and therefore, displays high mechanical strength while having ultra-low density (8.257 mg·cm−3). The CGOA has a 3D interconnected porous structure, beneficial graphene framework defects and abundant oxygen-containing functional groups, which offer favorable diffusion channels and effective adsorption sites for the transport and adsorption of dye molecules. The adsorption performance of rhodamine B by an optimized CGOA shows a maximum monolayer adsorption capacity of 312.50 mg·g−1, as determined by Langmuir isotherm parameters. This CGOA exhibited a better adsorption efficiency (99.99%) in alkaline solution, and satisfactory stability (90.60%) after three cycles. In addition, adsorption experiments on various dyes have revealed that CGOA have better adsorption capacities for cationic dyes than anionic dyes.

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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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Amino-Functionalized Multi-Walled Carbon Nanotubes as Novel Adsorbents for Selective Adsorption of Anionic Dyes in Aqueous Solution

NANO ◽

10.1142/s1793292015500654 ◽

2015 ◽

Vol 10 (05) ◽

pp. 1550065 ◽

Cited By ~ 3

Author(s):

Hui Huang ◽

Jingang Yu ◽

Wei Liu ◽

Xinyu Jiang

Keyword(s):

Carbon Nanotubes ◽

Aqueous Solution ◽

Adsorption Kinetics ◽

Organic Dyes ◽

Selective Adsorption ◽

Order Kinetic ◽

Equilibrium Isotherms ◽

Anionic Dyes ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

In this study, amino-functionalized multi-walled carbon nanotubes ( MWCNTs - NH 2) were successfully synthesized via an improved method and used for removal of organic dyes in aqueous solution. The synthesized MWCNTs - NH 2 were characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscope (SEM), etc. The adsorption capacity and selectivity of MWCNTs - NH 2 for organic dyes was evaluated using rhodamine B ( RhB ), malachite green (MG), methyl orange (MO) and congo red (CR) as models. The selective adsorption toward anionic dyes was found for the MWCNTs - NH 2, and MO was selected as a typical anionic dye to deeply investigate the adsorption kinetics, equilibrium isotherms and thermodynamic parameters of the adsorption process. The adsorption kinetics and equilibrium isotherms data fitted well with the pseudo-second-order kinetic equation and Langmuir isotherm model. The thermodynamics study revealed that the adsorption of MO onto MWCNTs - NH 2 was spontaneous, exothermic and physisorptive in nature. The results indicated that MWCNTs - NH 2 are promising nanomaterials for removal of anionic dyes from industrial wastewater.

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