Removal of methyl orange from aqueous solutions by magnetic maghemite/chitosan nanocomposite films: Adsorption kinetics and equilibrium

Jiang, Ru; Fu, Yongqian; Zhu, Huihui; Yao, Jun; Xiao, Ling

doi:10.1002/app.37003

Cited by 150 publications

(37 citation statements)

References 41 publications

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“…Therefore, it is assumed that the adsorption of EGCG onto NICBs and EICBs is the monolayer adsorption on an energetically homogeneous surface. Similar adsorption mechanism of other adsorbates onto chitosan beads was addressed in the previous literatures (Jiang et al 2012;Zuo 2014). The Langmuir adsorption constant b reflects the affinity of the adsorbent for the adsorbate.…”

Section: Adsorption Isothermsupporting

confidence: 56%

The effective and selective separation of (−)-epigallocatechin gallate by molecularly imprinted chitosan beads

Jing

Yin

2017

J Food Sci Technol

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The (2)-epigallocatechin gallate (EGCG) imprinted chitosan beads (EICBs) were fabricated for the effective and selective separation of EGCG. The EGCG molecules interacted with the amino groups of chitosan in the imprinting process, resulting in a highly porous structure of EICBs and more adsorption sites. Consequently, EICBs exhibited better adsorption performance than nonimprinted chitosan beads. The maximum adsorption capacity of EGCG onto EICBs reached 135.50 mg/g at 313 K. The imprinting factor of EICBs was 4.22, indicating that EICBs possess good recognition ability and selectivity for EGCG. After five cycles of reuse, only a slight decrease (7.77%) in the adsorption capacity was observed, demonstrating the satisfactory reusability of EICBs. Furthermore, the adsorption of EGCG onto EICBs is deduced to be the monolayer adsorption on an energetically homogeneous surface; the hydrogen bonding between EGCG and EICBs is the main driving force for the adsorption. Our studies suggest that EICBs have a great potential for the effective and selective separation of EGCG.

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Section: Adsorption Isothermsupporting

confidence: 56%

The effective and selective separation of (−)-epigallocatechin gallate by molecularly imprinted chitosan beads

Jing

Yin

2017

J Food Sci Technol

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“…led to the proportionate release of a large quantity of effluent into the environment. In addition, this effluent contained non-biodegradable toxic and carcinogenic dye substances into the environment [1][2][3][4][5]. Rhodamine B (RhB) and chromotrope 2R (C2R) are synthetic dyes that are commonly used in leather, textile, and paper industries and cause various health hazards [6,7].…”

Section: Introductionmentioning

confidence: 99%

Amphoteric gellan gum-based terpolymer–montmorillonite composite: synthesis, swelling, and dye adsorption studies

Zauro

Vishalakshi

2017

Int J Ind Chem

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A terpolymer gel, Gellan gum-graft-poly(2-acrylamido-2-methyl-1-propanesulfonic acid-co-dimethylaminopropyl methacrylamide) and its composite with the clay, Montmorillonite, was prepared by free-radical polymerization and crosslinking reactions in solution. The terpolymer gel and the clay composite were characterized using FTIR, TGA, SEM, and X-ray diffraction techniques. Swelling studies were carried out in different pH and salt solutions. The gel showed maximum swelling capacity in alkaline medium, while the composite showed higher swelling in neutral medium. The swelling of the gel and the composite followed second kinetics model and water transport is found to be a less Fickian diffusion process. The terpolymer gel and the composite were evaluated for the adsorption of rhodamine B (RhB) and chromotrope 2R (C2R) dyes. Rhodamine B is found to be adsorbed to a higher extent than chromotrope 2R and the adsorption isotherm studies suggested that adsorption of both RhB and C2R on the terpolymer gel was best explained by Langmuir model, while the adsorption on the Composite fitted best into Freundlich model. Similarly, the adsorption kinetics data for both RhB and C2R dyes followed the second-order kinetics.

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“…Such composite materials have advantages such as enhanced tensile strength, higher toughness, light weight, flexibility and tuneable magnetic and electrical properties [1][2][3]. There has been rapid growth in using PNCs for various applications such as in electromagnetic interference shielding [4], biosensing [5], hyperthermia [6], heavy metal and dye removal [7,8] and for microwave applications [9]. Recently, biopolymer based green PNCs have attracted scientific interest due to their biodegradable and environmental friendly nature.…”

Section: Introductionmentioning

confidence: 98%

Investigation of polymer dynamics in chitosan-maghemite nanocomposites: a potential green superparamagnetic material

Saravanan

Ramasamy

2016

J Polym Res

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Magnetic composites with superparamagnetic properties have attracted great scientific interest recently. In this article we have investigated chitosan-maghemite (γ-Fe 2 O 3 ) nanocomposite. We have analyzed the effect of temperature and the concentration of maghemite nanoparticles upon the relaxation behaviour of the nanocomposite using Broad band dielectric spectroscopy (BDS). Additionally, various characterization techniques such as X-ray diffraction (XRD), Fourier transform infra red spectra (FTIR), Scanning electron microscopy (SEM), Transmission electron spectroscopy (TEM), Thermo gravimetric Analysis (TGA), Vibrating Sample Magnetometer (VSM), Atomic Force Microscopy (AFM) and Raman spectroscopy have been used for our investigation. Our investigation shows that maghemite nanoparticles interact with chitosan leading to morphological changes in the films and results in modifications in the dielectric and electrical characteristics of the nanocomposite. New relaxations have been identified and their modifications due to maghemite nanoparticles have been investigated. The nanocomposites exhibit superparamagnetic behaviour. This research will benefit research in battery technology and super capacitors.

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Removal of methyl orange from aqueous solutions by magnetic maghemite/chitosan nanocomposite films: Adsorption kinetics and equilibrium

Cited by 150 publications

References 41 publications

The effective and selective separation of (−)-epigallocatechin gallate by molecularly imprinted chitosan beads

The effective and selective separation of (−)-epigallocatechin gallate by molecularly imprinted chitosan beads

Amphoteric gellan gum-based terpolymer–montmorillonite composite: synthesis, swelling, and dye adsorption studies

Investigation of polymer dynamics in chitosan-maghemite nanocomposites: a potential green superparamagnetic material

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