Enhanced catalytic ability of chitosan–Cu–Fe bimetal complex for the removal of dyes in aqueous solution

Rashid, Sadia; Shen, Chensi; Chen, Xiaoguang; Su, Li; Chen, Yanhong; Wen, Yuezhong; Liu, Jianshe

doi:10.1039/c5ra14711e

Cited by 63 publications

(28 citation statements)

References 45 publications

(44 reference statements)

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“…The peak at a binding energy of 400.6 eV, accounting for 50.8% of the total N1s spectral intensity, stems from primary amine groups (-NH 2 ) and the component at a binding energy of 402.1 eV, which contributes for 17.5% to the total N1s spectral intensity, is attributed to protonated amine end groups (NH 3 + ) that are positively charged and connected to the negatively charged clay sheets [55]. The third peak at 399.7 eV, which makes up 31.7% of the total N1s spectral intensity, results from nitrogen groups (R-NH-R and R-NH 2 ) coordinated with Fe 3+ ions [56]. This last species drives the geometry of the DODA-clay-Fe/POSS film; the coordination of iron (six ligands available) brings about the linking of a second silsesquioxane and the creation of a staggered layer during film deposition, as sketched in Scheme 2.…”

Section: Probing the Surface Of Doda-clay-fe/poss By Xpsmentioning

confidence: 99%

Insertion of Iron Decorated Organic–Inorganic Cage-Like Polyhedral Oligomeric Silsesquioxanes between Clay Platelets by Langmuir Schaefer Deposition

Potsi

Gengler

et al. 2020

Materials

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Tuning the architecture of multilayer nanostructures by exploiting the properties of their constituents is a versatile way to develop multifunctional films. Herein, we report a bottom-up approach for the fabrication of highly ordered hybrid films consisting of dimethyldioctadecylammonium (DODA), iron decorated polyhedral oligomeric silsesquioxanes (POSS), and montmorillonite clay platelets. Clay platelets provided the template where Fe/POSS moieties were grafted by the use of the surfactant. Driven by the iron ions present, DODA adopted a staggered arrangement, which is essential to realize the controllable layer-by-layer growth of the film. The elemental composition of the film was studied by X-ray photoelectron spectroscopy and X-ray reflectivity confirmed the existence of smooth interfaces between the different layers.

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Section: Probing the Surface Of Doda-clay-fe/poss By Xpsmentioning

confidence: 99%

Insertion of Iron Decorated Organic–Inorganic Cage-Like Polyhedral Oligomeric Silsesquioxanes between Clay Platelets by Langmuir Schaefer Deposition

Potsi

Gengler

et al. 2020

Materials

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“…Bond strength between adsorbent and adsorbate can be assessed by thermodynamic measurements. [61]. The separation of both, dyes and heavy metal ions, is the content of several investigations using composites.…”

Section: Chitosan As Sorbentmentioning

confidence: 99%

Sewage Polluted Water Treatment via Chitosan: A Review

Hahn¹,

Zibek²

2018

Chitin-Chitosan - Myriad Functionalities in Science and Technology

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Due to the increasing scarcity of water, wastewater treatment and water conditioning are one of the major future issues. Together with the need to apply highly accessible abundant materials and the demand to replace fossil-based chemicals with sustainable compounds from renewable resources, chitosan (CS) provides some of the solutions to obtain these goals and combines both, abundance and sustainability. Hence, the focus of this review is on the application of CS in wastewater treatment providing advantages and drawbacks in using CS in contrast to chitin. We herewith present the application of CS for coagulation/flocculation purposes, whether as native compound, as functionalized molecule or as blend, respectively, composite. The heavy metal, respectively, dye removal is an additional theme to be addressed in the body of the text. The third topic of this review contains the application of CS blends or composites in order to prepare membrane materials for water purification or conditioning. Together with a summary of the recent study, we discuss these findings and possible consequences for future works. In addition, we provide some theoretical background of the processes that CS is involved in and state some mechanistic insights.

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“…A chitosan-Fe-Al complex was prepared by the following procedure (Ma et al 2014;Rashid et al 2015). Chitosan powders (a-chitosan or b-chitosan, 1.0 g) were dissolved in 0.1 M FeCl 3 aqueous solution (50 mL) at room temperature for 2 h. Then, 0.15 M of AlCl 3 Á 6H 2 O was dissolved in the same solution.…”

Section: Preparation Of Chitosan-metal Complexesmentioning

confidence: 99%

“…The water molecules or other ions in solution complete the coordination (Hernandez et al 2008;Shen et al 2013). According to the results, the adsorption ability of chitosan-metal complexes is strongly dependent on the chelated metals, as the increased number of adsorption sites are mainly provided by the metal centres in the chitosan-metal complexes (Rashid et al 2015;Rashid et al 2018). To provide more evidence of the adsorption mechanism, XPS analyses were conducted for chitosan-metal complexes with different structures.…”

Section: Proposed Working Mechanismmentioning

confidence: 99%

“…For instance, a chitosan-Fe III complex has been used as an efficient adsorbent for the removal and detoxification of Cr VI from aqueous solutions (Shen et al 2013). A magnetic chitosan-Fe III hydrogel has been proposed for adsorbing dyes from strongly alkaline solutions (Rashid et al 2015;Shen et al 2011a). Meanwhile, various other kinds of metal ions, such as Zn II , Ni II , Ca II , Al III , La III , Mo VI and Zr IV , have also been used to prepare chitosan-metal complexes, and have been applied to pollutant removal (Chen et al 2017;Ma et al 2014;Rashid et al 2018, Shen et al 2016.…”

Section: Introductionmentioning

confidence: 99%

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Tuning the adsorption behaviour of β-structure chitosan by metal binding

Wang

et al. 2018

Environ. Chem.

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Environmental contextChitosan is an abundant natural component of marine life with potential applications as an adsorbant material for pollutants. We investigate the binding behaviour of chitosan, and show that the β-type structure readily chelates metal ions leading to enhanced adsorption of anionic pollutants in the chitosan-metal complex. The results are highly relevant to the removal of anionic organic pollutants from water. AbstractChitosan, which is commonly extracted from squid pens of the Loligo genus, has a β-type structure. Chitosan has potential application to the adsorption of pollutants but has received little study. We investigate the adsorption ability of β-structure chitosan as well as FeIII and AlIII chitosan-metal complexes. Pristine β-chitosan shows lower adsorption abilities for dye, CrVI and fluoride ions compared with those for α-chitosan, mainly owing to having fewer –NH3+ groups on its surface. However, the anionic pollutant adsorption efficiency of β-chitosan is clearly enhanced when chelated with metal ions. A β-structure chitosan-Fe-Al complex displayed adsorption capacities of 621.45 mg g−1 and 144.53 mg g−1 for Acid Red 73 dye and fluoride ions, respectively, according to the fitted Langmuir–Freundlich model; and of more than 173.03 mg g−1 for CrVI, according to the Freundlich model. These values are much higher than those observed for α-structure chitosan-metal complexes. This enhancement effect on the sorptive behaviour of β-chitosan can be attributed to its loose structure. The polymer chains of β-chitosan are arranged in parallel with relatively weak intermolecular forces, which allows them to easily chelate metal ions. Anionic pollutants can then be efficiently adsorbed by the chelated metal ions in the chitosan-metal complex if the electrostatic attraction of the –NH3+ groups is weak. This investigation provides a better understanding of β-chitosan-based adsorbents for application to anionic pollutant adsorption and removal.

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Enhanced catalytic ability of chitosan–Cu–Fe bimetal complex for the removal of dyes in aqueous solution

Abstract: In this study, despite the high adsorption ability, efficient catalytic activity of a chitosan–metal complex has been developed through the chelation of chitosan polymer with bimetals Cu(ii) and Fe(iii).

Cited by 63 publications

References 45 publications

Insertion of Iron Decorated Organic–Inorganic Cage-Like Polyhedral Oligomeric Silsesquioxanes between Clay Platelets by Langmuir Schaefer Deposition

Insertion of Iron Decorated Organic–Inorganic Cage-Like Polyhedral Oligomeric Silsesquioxanes between Clay Platelets by Langmuir Schaefer Deposition

Sewage Polluted Water Treatment via Chitosan: A Review

Tuning the adsorption behaviour of β-structure chitosan by metal binding

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