Exploring the adsorption mechanisms of cationic and anionic dyes onto agricultural waste peels of banana, cucumber and potato: Adsorption kinetics and equilibrium isotherms as a tool

2018 ◽  
Vol 6 (6) ◽  
pp. 6958-6970 ◽  
Author(s):  
A. Stavrinou ◽  
C.A. Aggelopoulos ◽  
C.D. Tsakiroglou
Keyword(s):  
Adsorption Kinetics ◽  
Agricultural Waste ◽  
Equilibrium Isotherms ◽  
Anionic Dyes ◽  
Adsorption Mechanisms

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

NANO ◽  
2015 ◽  
Vol 10 (05) ◽  
pp. 1550065 ◽  
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.

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

2009 ◽  
Vol 172 (1) ◽  
pp. 99-107 ◽  
Author(s):  
Dazhong Shen ◽  
Jianxin Fan ◽  
Weizhi Zhou ◽  
Baoyu Gao ◽  
Qinyan Yue ◽  
...  
Keyword(s):  
Adsorption Kinetics ◽  
Anionic Dyes ◽  
Adsorption Kinetics And Isotherm

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.

Modulation of the driving forces for adsorption on MIL-101 analogues by decoration with sulfonic acid functional groups: superior selective adsorption of hazardous anionic dyes

2020 ◽  
Vol 49 (20) ◽  
pp. 6651-6660
Author(s):  
Ji-Min Yang ◽  
Wei Zhang ◽  
Run-Zhi Zhang ◽  
Meng-Xuan Tong
Keyword(s):  
Functional Groups ◽  
Sulfonic Acid ◽  
Driving Forces ◽  
Selective Adsorption ◽  
Anionic Dyes ◽  
Adsorption Mechanisms ◽  
Adsorption Capacities

MIL-101-SO3H analogues functionalized with –SO3H groups exhibited superior CR, MO and AC adsorption capacities because of their distinct adsorption mechanisms.

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