Comparison of dye adsorption by mesoporous hybrid gels: Understanding the interactions between dyes and gel surfaces

Wu, Zhijian; You, Laijiang; Xiang, Hong; Jiang, Yan

doi:10.1016/j.jcis.2006.08.018

Cited by 34 publications

(18 citation statements)

References 19 publications

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“…Hydrophobic interaction was a tendency of nonpolar groups to associate in aqueous solution. Because of the aliphatic branches on its pendant groups, the grafted AMPS had a hydrophobic character and could react with benzene rings in MB through hydrophobic interaction [44,45]. The mechanism between MB and FSMAA in surface adsorption is schematically illustrated in Figure 10.…”

Section: Resultsmentioning

confidence: 99%

Polymer-Functionalized Magnetic Nanoparticles: Synthesis, Characterization, and Methylene Blue Adsorption

Zheng

Zhao

et al. 2018

Materials

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The removal of methylene blue (MB) from wastewater has attracted global concerns. In this study, polymer-functionalized magnetic nanoparticles for MB removal, Fe3O4@SiO2-MPS-g-AA-AMPS (FSMAA), were successfully synthesized by grafting acrylic acid (AA) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) on the surface of vinyl-modified Fe3O4@SiO2. With various characterization techniques, it was confirmed that the obtained FSMAA had a core–shell structure, a good magnetic property, and plenty of functional groups on its surface. MB adsorption experiments showed that the adsorption capacity of FSMAA was notably enhanced as the grafted monomer concentration and solution pH were increased. The adsorption kinetic data and isothermal data were well described by the pseudo-second-order kinetic model and the Langmuir model, respectively. The maximum adsorption capacity of FSMAA was 421.9 mg g−1 with grafted monomer concentration at 2.0 mol L−1 and solution pH at 9, much higher than those of other adsorbents stated in previous literatures. Based on XPS analysis, surface adsorption mechanism between FSMAA and MB was electrostatic interaction, hydrogen bonding, and hydrophobic interaction. Furthermore, FSMAA was effectively regenerated by acid pickling, and the remaining adsorption capacity was more than 60% after eight adsorption–regeneration cycles. All the results demonstrated the self-made FSMAA was a desirable adsorbent to remove MB from wastewater.

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Section: Resultsmentioning

confidence: 99%

Polymer-Functionalized Magnetic Nanoparticles: Synthesis, Characterization, and Methylene Blue Adsorption

Zheng

Zhao

et al. 2018

Materials

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“…These experiments were carried out under the same conditions as those used in the adsorption equilibrium experiments (temperature and agitation), and samples for analysis were collected after a certain contact time that varied between 5 and 1440 min. After establishing the contact time (360 min), experiments were performed in order to determine the SDBS uptake along time, varying the feed solution concentrations (11,22,44 and 87 mg L −1 ) at some conditions of temperature, adsorbent amount and adsorbate volume described above.…”

Section: Adsorption Equilibrium and Kineticsmentioning

confidence: 99%

“…As the phenolic compounds have functional groups of hydrophobic and hydrophilic character, several types of interactions with the adsorbents are expected, namely hydrogen bonding, hydrophobic and electrostatic interactions, being these interactions also dependent on the pH of the solution, in particular the latter one [8][9][10][11]. Thus, an improved adsorption may be achieved by tailoring the aerogels surface chemistry.…”

Section: Introductionmentioning

confidence: 99%

“…Regarding to the adsorption of phenolic compounds on silicabased materials, including aerogels/xerogels, only a few studies were found in the literature. Wu et al [9][10][11] compared the adsorption of organic dyes (alizarin and phenol red) on several xerogels, synthesized by the co-precursor approach combining TEOS with several triethoxysilanes and, also, with bis(trimethoxysilyl)hexane (BTMSH) and bis(trimethoxysilylpropyl)amine (BTMSPA). They concluded that the organic dyes adsorption in the xerogels is influenced by all types of interactions referred above, but the hydrophobic interactions are of major relevance.…”

Section: Introductionmentioning

confidence: 99%

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Silica-based aerogels as adsorbents for phenol-derivative compounds

Matias

Marques

Quina

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Surface functionalization is also helpful to improve the adsorption capacity and selectivity of the adsorbents by taking advantage of specific interactions between adsorbents and adsorbates, the porosity and the textural properties [2][3][4].…”

Section: Introductionmentioning

confidence: 99%