Zn (Ce,Mn)-MOFs with (3,4,5)-connected 3-D topology network and test of photocatalysis on the reduction of Cr6+ by Zn (Ce)-MOFs

Xu, Qianqian; Fan, Hongjie; Li, Yintao; Christensen, Kirsten E.; Ren, Tie‐Zhen

doi:10.1016/j.poly.2015.02.027

Cited by 16 publications

(5 citation statements)

References 40 publications

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“…The reduction kinetic profile (−ln( C t / C 0 ) versus reaction time) of Cr(VI) in the presence of Zn-MOF as a catalyst and ethanol as a hole scavenger (1.0 mL) at pH 2.0 under natural sunlight, followed the pseudo-first-order kinetics model, are shown in Figure b. It is noteworthy to mention that the reduction efficiency of the Zn-MOF is better than those of several previously reported MOF-based photocatalysts. ,,− The proposed reduction of Cr(VI) by the Zn-MOF also holds significant merit compared to other reported MOFs, as it is triggered by natural light (sunlight), which makes this photocatalyst eligible for sustainable and cost-effective real-life application.…”

Section: Resultsmentioning

confidence: 91%

Photocatalytic Reduction and Recognition of Cr(VI): New Zn(II)-Based Metal–Organic Framework as Catalytic Surface

Kaur

Sinha

Krishnan

et al. 2020

Ind. Eng. Chem. Res.

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This report deals with the fabrication and utilization of a novel 2D zinc-based metal−organic framework (MOF) {[Zn(PA 2− )(4,4′-bpy)]-(H 2 O)} n (where PA = pamoic acid and 4,4′-bpy = 4,4′-bipyridine). The Zn-MOF has been synthesized via a solvothermal method and emanates green fluorescence. As Cr(VI) is a fatal and carcinogenic ion, it is extremely important to discern and remove it from nature. The bright green fluorescence of Zn-MOF can be quenched upon interaction with a Cr 2 O 7 2− ion, which implies the MOF's applicability as a Cr(VI) detector through turn-off fluorescence signaling. On the contrary, among various strategies to remove Cr(VI), the photocatalytic reduction of Cr(VI) to Cr(III) is acknowledged as the most effective one. Delightfully, apart from being a Cr(VI) sensor, this same Zn-MOF can be further recruited as a photocatalyst to convert Cr(VI) to Cr(III). The catalytic reduction is triggered by natural sunlight, acidic pH, and a hole scavenger. In addition, good stability and reusability of the Zn-MOF satisfies the quest for a potential photocatalyst for conversion of Cr(VI) to Cr(III). The limit of detection for fluorometric recognition of Cr(VI) was found to be 4.12 μM, and almost a complete reduction of toxic Cr(VI) ion was achieved.

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Section: Resultsmentioning

confidence: 91%

Photocatalytic Reduction and Recognition of Cr(VI): New Zn(II)-Based Metal–Organic Framework as Catalytic Surface

Kaur

Sinha

Krishnan

et al. 2020

Ind. Eng. Chem. Res.

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“…As shown in Figure 3 , weight loss occurring in the argon atmosphere could be divided into two separate stages. The first stage, which occurred before 167 °C, was due to the loss of residual solvent molecules from the framework material from the solution-based synthesis [ 54 , 55 ]. The second stage, which started at 392 °C, occurred when the chemical bonds began to break and the carboxyl and benzene ring were lost.…”

Section: Resultsmentioning

confidence: 99%

Comparison Study on the Adsorption Capacity of Rhodamine B, Congo Red, and Orange II on Fe-MOFs

et al. 2018

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Using a microwave-assisted ball-milling approach, Fe-based metal-organic frameworks (Fe-MOFs) were prepared from FeSO4·7H2O and trimesic acid. Scanning electron microscopy, Fourier-transform infrared spectrometry, X-ray, and thermogravimetric analysis were utilized to characterize the thermal stability and structure of the prepared Fe-MOFs. These Fe-MOFs were used to remove organic dyes from aqueous solutions. Specifically, they removed 96.97% of 23.3592 mg/L of Congo red in a 200 mL solution within 300 min of treatment with natural light at 15 °C. Likewise, 88.21 and 70.90% of 22.7527 mg/L of Orange II and 17.8326 mg/L of Rhodamine B, respectively, were removed from 200 mL solutions within 300 min of treatment at 15 °C. At 35 °C, 99.57, 95.98, and 99.38% of 23.3855 mg/L of Congo Red, 22.7365 mg/L of Orange II, and 17.9973 mg/L of Rhodamine B, respectively, were removed from 200 mL solutions within 300 min of treatment. The adsorption kinetics were investigated and the pseudo-first-order kinetic model was found to be superior to the pseudo-second-order kinetic model. Overall, using metal-organic frameworks to treat dye wastewater was found to be inexpensive, feasible, and efficient. Therefore, this material has future prospects in research and applications in the purification of wastewater.

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“…[ 5–7 ] Photocatalytic Cr 6+ reduction has emerged as an attractive direction due to its potential to be environmental friendly, cheap, and sustainable. [ 1,8 ] Various photocatalysts have been reported for Cr 6+ reduction, including phlo‐@POF, [ 9 ] Cu 2 O/TiO 2 , [ 10 ] Zn(Ce, Mn)‐MOFs, [ 11 ] ZnWO 4 , [ 5 ] SnS 2 –In 2 S 3 , [ 12 ] and Gd(OH) 3 . [ 6 ] However, many of the reported materials show limited photocatalytic efficiency due to their wide bandgaps limiting their light absorption ability and/or inefficient redox ability due to fast recombination of photogenerated electron–hole pairs.…”

Section: Introductionmentioning

confidence: 99%

Bi₂S₃–In₂S₃ Heterostructures for Efficient Photoreduction of Highly Toxic Cr⁶⁺ Enabled by Facet‐Coupling and Z‐Scheme Structure

Wang

Karuturi

Zan

2021

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environment, which is defined as one of most toxic pollutants by the United States Environmental Protection Agency due to its high solubility. [1][2][3] With 100 times higher toxicity than Cr 3+ , Cr 6+ poses a great threat to the ecosystem, particularly from its biological recycling. [4] Thus the concentration of Cr 6+ in industrial wastewater needs to be strictly controlled before it can be safely discharged. Many methodsThe ORCID identification number(s) for the author(s) of this article can be found under

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Zn (Ce,Mn)-MOFs with (3,4,5)-connected 3-D topology network and test of photocatalysis on the reduction of Cr6+ by Zn (Ce)-MOFs

Cited by 16 publications

References 40 publications

Photocatalytic Reduction and Recognition of Cr(VI): New Zn(II)-Based Metal–Organic Framework as Catalytic Surface

Photocatalytic Reduction and Recognition of Cr(VI): New Zn(II)-Based Metal–Organic Framework as Catalytic Surface

Comparison Study on the Adsorption Capacity of Rhodamine B, Congo Red, and Orange II on Fe-MOFs

Bi₂S₃–In₂S₃ Heterostructures for Efficient Photoreduction of Highly Toxic Cr⁶⁺ Enabled by Facet‐Coupling and Z‐Scheme Structure

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Zn (Ce,Mn)-MOFs with (3,4,5)-connected 3-D topology network and test of photocatalysis on the reduction of Cr6+ by Zn (Ce)-MOFs

Cited by 16 publications

References 40 publications

Photocatalytic Reduction and Recognition of Cr(VI): New Zn(II)-Based Metal–Organic Framework as Catalytic Surface

Photocatalytic Reduction and Recognition of Cr(VI): New Zn(II)-Based Metal–Organic Framework as Catalytic Surface

Comparison Study on the Adsorption Capacity of Rhodamine B, Congo Red, and Orange II on Fe-MOFs

Bi2S3–In2S3 Heterostructures for Efficient Photoreduction of Highly Toxic Cr6+ Enabled by Facet‐Coupling and Z‐Scheme Structure

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Bi₂S₃–In₂S₃ Heterostructures for Efficient Photoreduction of Highly Toxic Cr⁶⁺ Enabled by Facet‐Coupling and Z‐Scheme Structure