Single step synthesis of a polyhydroxy ether and its optimization to adsorption of a textile dye

Torres, Dimas Ignacio; Lazaro-Martínez, Juan M.; Copello, Guillermo Javier; Orto, Viviana Campo Dall’

doi:10.1016/j.jece.2019.103416

Cited by 5 publications

(7 citation statements)

References 33 publications

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“…It is worth mentioning that, despite the fact that hydroxy and amine functionalized compounds show similar maximum adsorption capacity,t he K L and n parameters values obtained from the Langmuir and Freundlich fittings suggest that their chemical affinity towards Cr VI is different. [66][67][68][69] As expected, the opposite trend is observed at Cr III adsorption experiments,a si nt his case, the highert he concentration of -OH or -NH 2 groups, the highert he Cr III adsorption capacity of the materials, being the linker-defect generation detrimen- tal. In addition, UiO-66-(OH) 2 and UiO-66-(OH) 2 -def compounds are more effective than amine functionalized analogues to sorb Cr III species.…”

Section: Chromium Adsorptioncapacitysupporting

confidence: 52%

“…Therefore, in terms of Cr VI adsorption capacity, the combination of linker defective network with the presence of electron donor hydroxy or amine groups is the best combination to reach the highest possible saturation capacity (i.e., ∼40 mg g −1 , Figure 2 A–C). It is worth mentioning that, despite the fact that hydroxy and amine functionalized compounds show similar maximum adsorption capacity, the K L and n parameters values obtained from the Langmuir and Freundlich fittings suggest that their chemical affinity towards Cr VI is different [66–69] …”

Section: Resultsmentioning

confidence: 97%

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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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Section: Chromium Adsorptioncapacitysupporting

confidence: 52%

Section: Resultsmentioning

confidence: 97%

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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“…The breakthrough adsorption experiment was carried out in dark conditions, with an initial Cr VI concentration of 2.5 ppm and a 1 mL/min flux (Figure 3a). Experimental data for the adsorption stage in the open system was fitted to Thomas and Yoon-Nelson models, but results were not correctly fitted by these models [49]. It is important to point out that the kinetics of adsorption differ significantly in static and continuous flux experiments.…”

Section: Uio-66-nh 2 Chromatographic Columns: Continuous Flux Adsorptionmentioning

confidence: 99%

Modulation of the Bifunctional CrVI to CrIII Photoreduction and Adsorption Capacity in ZrIV and TiIV Benchmark Metal-Organic Frameworks

et al. 2021

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The presence of hexavalent chromium water pollution is a growing global concern. Among the currently applied technologies to remove CrVI, its adsorption and photocatalytic reduction to CrIII less mobile and toxic forms are the most appealing because of their simplicity, reusability, and low energy consumption. However, little attention has been paid to bifunctional catalysts, that is, materials that can reduce CrVI to CrIII and retain both hexavalent and trivalent chromium species at the same time. In this work, the dual CrVI adsorption–reduction capacity of two iconic photoactive water-stable zirconium and titanium-based metal–organic frameworks (MOFs) has been investigated: UiO-66-NH2 and MIL-125. The bifunctionality of photoactive MOFs depends on different parameters, such as the particle size in MIL-125 or organic linker functionalization/defective positions in UiO-66 type sorbents. For instance, the presence of organic linker defects in UiO-66 has shown to be detrimental for the chromium photoreduction but beneficial for the retention of the CrIII phototransformed species. Both compounds are able to retain from 90 to 98% of the initial chromium present at acidic solutions as well as immobilize the reduced CrIII species, demonstrating the suitability of the materials for CrVI environmental remediation. In addition, it has been demonstrated that adsorption can be carried out also in a continuous flux mode through a diluted photoactive MOF/sand chromatographic column. The obtained results open the perspective to assess the bifunctional sorption and photoreduction ability of a plethora of MOF materials that have been applied for chromium capture and photoreduction purposes. In parallel, this work opens the perspective to develop specific chemical encoding strategies within MOFs to transfer this bifunctionality to other related water remediation applications.

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“…Therefore, in this work we have combined a macro‐ and mesoporous chitin (CH) [12–15] biopolymer with the MOF‐808 microporous metal‐organic framework (MOF) [16,25,17–24] sorbent to create a porous composite with multiple porosities and chemical functionalities [28–30] . CH is the second most abundant natural polymer [31,32] . It can be easily handled and processed as macro‐ and mesoporous gel, [33–36] which enables its use as sorbent for macromolecules (e. g., enzymes and proteins) [37–40] .…”

Section: Introductionmentioning

confidence: 99%

“…[28][29][30] CH is the second most abundant natural polymer. [31,32] It can be easily handled and processed as macro-and mesoporous gel, [33][34][35][36] which enables its use as sorbent for macromolecules (e. g., enzymes and proteins). [37][38][39][40] Nevertheless, CH usually lacks the adsorption affinity for cationic and anionic inorganic species at the microporous scale.…”

Section: Introductionmentioning

confidence: 99%

Chitin/Metal‐Organic Framework Composites as Wide‐Range Adsorbent

et al. 2021

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Composites based on chitin (CH) biopolymer and metal-organic framework (MOF) microporous nanoparticles have been developed as broad-scope pollutant absorbent. Detailed characterization of the CH/MOF composites revealed that the MOF nanoparticles interacted through electrostatic forces with the CH matrix, inducing compartmentalization of the CH macropores that led to an overall surface area increase in the composites. This created a micro-, meso-, and macroporous structure that efficiently retained pollutants with a broad spectrum of different chemical natures, charges, and sizes. The unique prospect of this approach is the combination of the chemical diversity of MOFs with the simple processability and biocompatibility of CH that opens application fields beyond water remediation.

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Single step synthesis of a polyhydroxy ether and its optimization to adsorption of a textile dye

Cited by 5 publications

References 33 publications

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

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

Modulation of the Bifunctional CrVI to CrIII Photoreduction and Adsorption Capacity in ZrIV and TiIV Benchmark Metal-Organic Frameworks

Chitin/Metal‐Organic Framework Composites as Wide‐Range Adsorbent

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