Hexavalent chromium removal from water by ionic liquid modified metal-organic frameworks adsorbent

Nasrollahpour, A.; Moradi, S.E.

doi:10.1016/j.micromeso.2017.02.006

Cited by 70 publications

(18 citation statements)

References 32 publications

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“…[47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64] In this method, ILs are first dissolved in an excess amount of an inert solvent, such as acetone, methanol, or ethanol, to provideb etter dispersion.…”

Section: Wet Impregnation Methodsmentioning

confidence: 99%

“…[59] For the preparation of the IL/MOF composite, acidic chloroaluminate IL was impregnated into MIL-100(Fe) by the wet impregnationmethod. [59] For the preparation of the IL/MOF composite, acidic chloroaluminate IL was impregnated into MIL-100(Fe) by the wet impregnationmethod.…”

Section: Liquid-phaseadsorption and Separationmentioning

confidence: 99%

“…IL/MOF composites have recently been studied for chromate ion removal from water. [59] For the preparation of the IL/MOF composite, acidic chloroaluminate IL was impregnated into MIL-100(Fe) by the wet impregnationmethod. Different parameters, such as effect of contact time and agitation speed were investigated for the best chromate removal performance of the IL/MOF composite.…”

Section: Liquid-phaseadsorption and Separationmentioning

confidence: 99%

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Ionic Liquid/Metal–Organic Framework Composites: From Synthesis to Applications

2017

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Metal-organic frameworks (MOFs) have been widely studied for different applications owing to their fascinating properties such as large surface areas, high porosities, tunable pore sizes, and acceptable thermal and chemical stabilities. Ionic liquids (ILs) have been recently incorporated into the pores of MOFs as cavity occupants to change the physicochemical properties and gas affinities of MOFs. Several recent studies have shown that IL/MOF composites show superior performances compared with pristine MOFs in various fields, such as gas storage, adsorption and membrane-based gas separation, catalysis, and ionic conductivity. In this review, we address the recent advances in syntheses of IL/MOF composites and provide a comprehensive overview of their applications. Opportunities and challenges of using IL/MOF composites in many applications are reviewed and the requirements for the utilization of these composite materials in real industrial processes are discussed to define the future directions in this field.

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Section: Wet Impregnation Methodsmentioning

confidence: 99%

Section: Liquid-phaseadsorption and Separationmentioning

confidence: 99%

Section: Liquid-phaseadsorption and Separationmentioning

confidence: 99%

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Ionic Liquid/Metal–Organic Framework Composites: From Synthesis to Applications

2017

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“…Indeed, oxyanion adsorption capacity of UiO-66t ype materials is highly dependent on their defect density degree, as the under-coordinatedp ositions are preferential chemisorption pointso fo xyanions (Scheme 1A,B ). [44][45][46][47][48] Generally speaking, two approaches have been applied in Zr based MOFs in order to endow them of ad ual adsorption/ionreductivef unctionality:i )the organic pillars decoration with electron-donor groups that trigger the chromium reduction [49][50][51] (Scheme 1C)a nd ii)the use of photoactive building blockst hat are able to generate radicals to trigger the Cr VI to Cr III transformation. [21,[52][53][54][55][56] Therefore, depending on the chemical information encoded within the UiO-66 framework, its Cr VI adsorption and, more specifically,i ts ion-reductive capacity can be regulated to different extents.…”

Section: Introductionmentioning

confidence: 99%

Chromium Speciation in Zirconium‐Based Metal–Organic Frameworks for Environmental Remediation

Saiz

Iglesias

Navarrete

et al. 2020

Chemistry A European J

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Acute Cr VI water pollution duet oa nthropogenic activities is an increasing worldwide concern. The high toxicity and mobility of Cr VI makesi tn ecessary to develop dual adsorbent/ion-reductive materialst hat are able to capture Cr VI and transform it efficiently into the less hazardous Cr III. An accurated escription of chromium speciationa tt he adsorbent/ion-reductive matrix is key to assessing whether Cr VI is completely reduced to Cr III ,o ri fi ts incomplete transformation has led to the stabilization of highly reactive, transient Cr V species within the material. With this goal in mind, a dual ultraviolet-visible and electron paramagnetic spectroscopy approachh as been applied to determine the chromium speciation within zirconium-basedm etal-organic frameworks (MOFs). Our findings point out that the generation of defects at Zr-MOFs boosts Cr VI adsorption, whilst the presence of reductiveg roups on the organic linkersp lay ak ey role in stabilizing it as isolated and/or clustered Cr III ions.

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“…Recent research has indicated that graphene oxides and chemically modified graphene oxides have proved to be promising materials for the adsorption of metal ions due to their extraordinary mechanical strength and relatively large specific area 61 . Ionic liquids (ILs) have been recently gaining widespread recognition from both research and industrial applications, such as electrochemistry, extraction, organic synthesis and catalysis for clean technology and polymerization processes [62][63][64] . This is due to their unusual properties and great potential as ''green'' solvents for industrial processes.…”

Section: Introductionmentioning

confidence: 99%

Effective Removal of Hexavalent Chromium from Aqueous Solutions Using Ionic Liquid Modified Graphene Oxide Sorbent

Nasrollahpour¹

2017

Chem.Biochem.Eng.Q.

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Ionic liquid modified reduced graphene oxide (IL-rGO) was prepared and examined for chromate removal. The sorbent was characterized by N 2 adsorption-desorption measurement (BET), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) analysis. The sorption behavior of chromate on the ionic liquid modified reduced graphene oxide sorbent from an aqueous medium was studied by varying the parameters such as contact time, initial chromate concentration, pH, and agitation speed. The results showed that sorption kinetics of chromate by IL-rGO follows the pseudo second order, which indicates that the sorption mechanism is both chemical and physical interaction. The sorption isotherm studies revealed that Langmuir model provided the best fit to all the experimental data with an adsorption capacity of 232.55 mg g -1 for IL-rGO. Thermodynamic parameters, such as Gibbs free energy (-2.85 kJ mol -1 at 298 K), enthalpy (55.41 kJ mol -1 ), and entropy (11.64 J mol -1 K -1 ) of sorption of the chromate on ionic liquid modified reduced graphene oxide was evaluated, and it was found that the reaction was spontaneous and endothermic in nature.

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Hexavalent chromium removal from water by ionic liquid modified metal-organic frameworks adsorbent

Cited by 70 publications

References 32 publications

Ionic Liquid/Metal–Organic Framework Composites: From Synthesis to Applications

Ionic Liquid/Metal–Organic Framework Composites: From Synthesis to Applications

Chromium Speciation in Zirconium‐Based Metal–Organic Frameworks for Environmental Remediation

Effective Removal of Hexavalent Chromium from Aqueous Solutions Using Ionic Liquid Modified Graphene Oxide Sorbent

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