Removal of Azo Dyes from Water by Combined Techniques of Adsorption, Desorption, and Electrolysis Based on a Supramolecular Sorbent

Chen, Ming; Ding, Wenhua; Wang, Jing; Diao, Guowang

doi:10.1021/ie300916d

Cited by 53 publications

(30 citation statements)

References 50 publications

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“…These easy-to-prepare and reusable materials expect to be the promising for the treatment of aqueous solutions not only from benzene but also from its derivatives. For the last years, it was shown high adsorption efficiency of β-CD-containing adsorbents in the absorption of different aromatic compounds from water [14, 18, 24–26, 29, 35, 36, 45, 46]. Nowadays, there is an increasing interest in the research and development of adsorbent with satisfying adsorption capacity, high mechanical strength, high reusability, and ready availability, especially the adsorbent based on natural products for their ready availability and excellent biocompatibility, which will not cause additional environmental pollution in their application [26, 45, 46].…”

Section: Resultsmentioning

confidence: 99%

Structural Variety and Adsorptive Properties of Mesoporous Silicas with Immobilized Oligosaccharide Groups

2017

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In this research, we report on the synthesis of mesoporous silicas with various quantities of immobilized oligosaccharide groups and different pore ordering degree. The hydrothermal co-condensation of tetraethyl orthosilicate and β-cyclodextrin-containing organosilane in the presence of cetyltrimethylammonium bromide template was employed. The purpose of this investigation was to show the opportunity of increasing β-cyclodextrin content in silica matrix by changing the molar ratio of initial reagents during organosilane synthesis and to determine whether the enhancing of immobilized groups on the surface influences on model aromatic compound adsorption from water. It was prepared several β-cyclodextrin-organosilanes by modification of (3-aminopropyl)triethoxysilane with oligosaccharide (the molar composition of reaction mixtures were 1:1, 3:1, and 5:1) with using N,N′-carbonyldiimidazole as linking agent. Three types of MCM-41 materials were obtained with 0.018, 0.072, and 0.095 mmol g−1 β-cyclodextrin-group loading according to chemical analysis of silicas. The IR spectroscopy and potentiometric titration were also performed to confirm the presence of functional groups in the silica matrix. Nitrogen sorptometry experiments exhibited the decrease of high surface area (from 812 to 457 m2 g−1) and the average pore diameter (from 1.06 to 0.60 cm3 g−1) of synthesized silicas with increasing of immobilized oligosaccharide groups. The influence of β-cyclodextrin-organosilane presence on the forming of hexagonally arranged porous structure of silicas was evaluated by X-ray diffraction and TEM analyses. As the loading of oligosaccharide groups increases in obtained silicas, the (100) reflex in diffraction patterns is even less intense and broader, denoting the decrease of long-range pore ordering. Adsorption experiments were carried out to study the effect of β-cyclodextrin groups’ attendance in silica matrix on benzene uptakes from aqueous solutions. Experimental kinetic curves of benzene adsorption on synthesized silicas were compared with theoretical models of Lagergren and Ho-McKay for pseudo-first and pseudo-second-order processes. Langmuir and Freundlich isotherm models were used to evaluate adsorption processes and parameters. Obtained β-cyclodextrin-containing MCM-41 silicas demonstrate adsorption level performance of known samples and could be very promising for benzene uptakes from aqueous solutions in water treatment processes.

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Section: Resultsmentioning

confidence: 99%

Structural Variety and Adsorptive Properties of Mesoporous Silicas with Immobilized Oligosaccharide Groups

2017

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“…Polymer P.1 was found to be the best sorbent for MO (373 mg/g); composition 1 1 2 (497 mg/g) for AO5 and macrocycle 2 for CR (625 mg/g). In comparison with the last literature data, the sorption of MO and AO5 by P.1 and P.2 polymers has very high values (the sorption capacity for MO by Moringa peregrina ash is 35 mg/g (21), for AO5 by utilises canola stalks is 17 mg/g (22) and the sorption of CR has comparable values (by SiO 2 modified by b -cyclodextrin is 70 mg/g (23).…”

Section: Resultsmentioning

confidence: 59%

Amidoamine calix[4]resorcinarene-based oligomers and polymers as efficient sorbents of azo dyes from water

Shalaeva

Morozova

Mironova

et al. 2015

Supramolecular Chemistry

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2015) Amidoamine calix [4]resorcinarene-based oligomers and polymers as efficient sorbents of azo dyes from water, Supramolecular Chemistry, 27:9, 595-605,The sorption behaviour of three kinds of macrocyclic sorbents -amidoamine tetradodecyloxyphenylencalix [4] resorcinarene 1 and tetramethyloxyphenylencalix[4]-resorcinarene 2; composition of calix[4]resorcinarene 1 1 2, and novel P.1 and P.2 polymers with amidoamine calix[4]resorcinarene units towards three water-soluble azo dyes -methyl orange (MO), acid orange (AO5) and Congo red (CR) was studied. All sorbents form supramolecular complexes with the aforesaid dyes. The best sorbent for MO was shown to be polymer P.1, for the AO5 -composition 1 1 2 and for the CRmacrocycle 2, with high sorption capacities (373, 497 and 625 mg/g, respectively). The main factor in the binding of dyes by all studied sorbents proved to be surface electrostatic interactions. In addition to the Coulomb interactions, the most important factor for the polymers appeared to be the 'net' structure of the polymer with a high concentration of binding sites, providing electrostatic, hydrogen, dipole -dipole and hydrophobic interaction. Hydrophobic substituents in the sorbents exert a significant influence on the dye sorption. The increase of the sorbents' hydrophobicity leads to a lower sorption capacity for MO and CR and a higher sorption capacity for AO5. It was shown that sorption efficiency of the sorbent depends on the 'dye -sorbent' structure conformity.

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“…where q e (mg/g) is the amount of pollutant adsorbed at equilibrium, q max,e (mg/g) is the maximum adsorption capacity of adsorbent at equilibrium, c (mol/L) is the residual pollutant concentration at equilibrium, and K (L/mol) is the equilibrium constant. The well‐behaved linear relationship (see Figure S3 in Supporting Information) hasshown that the adsorption of MB onto β‐CD/g‐C 3 N 4 obey Langmuir's model (the correlation coefficient R 2 is close to 1) . According to the slope and the intercept of the straight line, q max,e and K both are respectively calculated to be 47.62 mg/g and 17355 L/mol, which are much larger than thoseof the pre‐exfoliated g‐C 3 N 4 (q max,e =15.87 mg/g and K=2801 L/mol).…”

Section: Resultsmentioning

confidence: 88%

“…According to the slope and the intercept of the straight line, q max,e and K both are respectively calculated to be 47.62 mg/g and 17355 L/mol, which are much larger than thoseof the pre‐exfoliated g‐C 3 N 4 (q max,e =15.87 mg/g and K=2801 L/mol). It's well‐known that the Langmuir equation was applicable to homogeneous adsorption, where theadsorption of each molecule onto the surface had equal adsorption activation energy, which suggested that the β‐CD/g‐C 3 N 4 composite possesses good dispersibility and has abundant functional groups and active sites for the removal of MB from wastewater system (more details are illustrated in Table S1‐2 and Figure S3).…”

Section: Resultsmentioning

confidence: 99%

Efficient Removal of Organic Dyes from Water by β-Cyclodextrin Functionalized Graphite Carbon Nitride Composite

Liu

Yang

et al. 2017

ChemistrySelect

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To develop a high efficient organic wastewater treatment material with the advantages of quick separation of pollutants and low environmental impact, this work reported a novel β‐cyclodextrin (β‐CD) functionalized g‐C3N4 composite (β‐CD/g‐C3N4) with integration of dual‐function of microfiltration and visible‐light driven photocatalytic degradation. The organic dye removal performance of the β‐CD/g‐C3N4 composite was investigated using methyl blue (MB) as a target pollutant for the first time. Furthermore, the mechanism of photocatalytic activity enhancement for the β‐CD/g‐C3N4 composite wasalso probed. The β‐CD/g‐C3N4 composite exhibited a significantly enlarged adsorption capacity and enhanced visible‐light driven photocatalytic activity in degrading MB compared with the pristine g‐C3N4 solely. Importantly, the β‐CD/g‐C3N4 composite filter membrane could be large‐scale prepared and recycled several times with no loss in microfiltration and photodegradation performances. This work gives insight to the effective integration of microfiltration and photodegradation for the improvement of performance in organic wastewater treatment.

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Removal of Azo Dyes from Water by Combined Techniques of Adsorption, Desorption, and Electrolysis Based on a Supramolecular Sorbent

Cited by 53 publications

References 50 publications

Structural Variety and Adsorptive Properties of Mesoporous Silicas with Immobilized Oligosaccharide Groups

Structural Variety and Adsorptive Properties of Mesoporous Silicas with Immobilized Oligosaccharide Groups

Amidoamine calix[4]resorcinarene-based oligomers and polymers as efficient sorbents of azo dyes from water

Efficient Removal of Organic Dyes from Water by β-Cyclodextrin Functionalized Graphite Carbon Nitride Composite

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