A Systematic Investigation of Decomposition of Nano Zn4O(C8H4O4)3 Metal−Organic Framework

Zhang, Lei; Hu, Yun Hang

doi:10.1021/jp911043r

Cited by 92 publications

(50 citation statements)

References 66 publications

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“…[29] Moreover, the breaking of the carboxylic bridges between Zn 4 O clusters and benzene rings is very important in the degradation of MOF-5 to produce C/ZnO. [30] The relative thermal stability of the isotypic M-BDCs observed in this study (Al-BDC > Cr-BDC > V-BDC) cannot be explained by the strength of the metal-oxygen bonds, because the average bond strength or bond dissociation energy follows the order of V À O (637) > Al À O (502) > Cr À O (461 kJ mol À1 ). [44] Moreover, the inertness or lability cannot be applied to explain the thermal stability.…”

Section: Wwwchemeurjorgmentioning

confidence: 99%

“…[29] MOF-5 decomposed into C/ZnO at high temperature. [30] By using TGA (thermogravimetric analysis) and TPMS (temperature-programmed mass spectrometry) methods, it has been found that the decomposition of MOF-5 occurs at 400 8C or above and is due to the breaking of carboxylic bridges between the Zn 4 O clusters and benzene rings. [30] MOF-177 decomposes in water in 12 h and the structure is also gradually changed from hexagonal to orthogonal, and finally to monoclinic phase in five weeks at ambient condition, showing the poor stability of MOF-177.…”

Section: Introductionmentioning

confidence: 99%

“…[30] By using TGA (thermogravimetric analysis) and TPMS (temperature-programmed mass spectrometry) methods, it has been found that the decomposition of MOF-5 occurs at 400 8C or above and is due to the breaking of carboxylic bridges between the Zn 4 O clusters and benzene rings. [30] MOF-177 decomposes in water in 12 h and the structure is also gradually changed from hexagonal to orthogonal, and finally to monoclinic phase in five weeks at ambient condition, showing the poor stability of MOF-177. [31] Water stability of various MOFs has been evaluated in water-containing solutions, and it has been understood that the stability is related to the type of metal cluster found in the MOFs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Chemical and Thermal Stability of Isotypic Metal–Organic Frameworks: Effect of Metal Ions

Kang

Khan

Haque

et al. 2011

Chemistry A European J

275

174

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Chemical and thermal stabilities of isotypic metal-organic frameworks (MOFs) like Al-BDC (Al-benzenedicarboxylate called MIL-53-Al), Cr-BDC (MIL-53-Cr) and V-BDC (MIL-47-V), after purification to remove uncoordinated organic linkers, have been compared to understand the effect of the central metal ions on the stabilities of the porous MOF-type materials. Chemical stability to acids, bases, and water decreases in the order of Cr-BDC>Al-BDC>V-BDC, suggesting stability increases with increasing inertness of the central metal ions. However, thermal stability decreases in the order of Al-BDC>Cr-BDC> V-BDC, and this tendency may be explained by the strength of the metal-oxygen bond in common oxides like Al(2)O(3), Cr(2)O(3), and V(2)O(5). In order to evaluate precisely the stability of a MOF, it is necessary to remove uncoordinated organic linkers that are located in the pores of the MOF, because a filled MOF may be more stable than the same MOF after purification.

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Section: Wwwchemeurjorgmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Chemical and Thermal Stability of Isotypic Metal–Organic Frameworks: Effect of Metal Ions

Kang

Khan

Haque

et al. 2011

Chemistry A European J

275

174

View full text Add to dashboard Cite

show abstract

“…As seen from XRD patterns in Fig and correspondent to the diffraction peaks of ZnO [20,21], indicating that the carbonization at 500 and 700 °C resulted in the decomposition of framework of MOF-5 and the formation of ZnO@carbon. This is because the Zn-O subunits in MOF-5 can act as a ZnO source to assemble into ZnO particles during the thermal decomposition [21]. Increasing the carbonization temperature to 850 °C (Fig.…”

Section: Insert Figmentioning

confidence: 76%

Porous carbon derived from Metal–organic framework (MOF) for capacitive deionization electrode

Chang

Duan

et al. 2015

Electrochimica Acta

129

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“…Specially, during carbonization, conventional micropores gradually emerged, and highly dispersed Zn 2+ matrix embedded in the carbon matrix was reduced to Zn. The vaporization of Zn subsequently led to the creation of nanopaths [37][38][39][45][46][47]. Meanwhile, the core-shell nanostructures of HCSs-Zn-910 are retained after pyrolysis at 910°C, and the sphere sizes are ca.…”

Section: Structural Properties Of Microporous Hollow Carbon Spheresmentioning

confidence: 99%

Synthesis of magnetic hollow carbon nanospheres with superior microporosity for efficient adsorption of hexavalent chromium ions

et al. 2015

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[19], polymer-based composites [20][21][22][23], a graphene oxide (GO)-based composite adsorbent [24], and activated carbon [25][26][27][28] have been explored and used in the removal of Cr(VI). Among these adsorbents, carbonaceous porous materials have been successfully used in the removal of Cr(VI) because of their acid and alkali corrosion resistance, excellent thermal and chemical stability and high adsorption capacity for heavy metals [29].In contrast to bulk materials, the high specific surface area of nanoscale materials provides more surface active sites, and good dispersability in solution to help facilitate mass transfer [1,30]. In addition, micropores inherently possess a strong adsorption potential, and can strongly trap and adsorb guest species from the external environment [31]. One can thus envisage that nanosized carbon materials with abundant micropores directly open to the environment could provide fast kinetics and a high adsorption capacity. Furthermore, to easily retrieve these nanosized adsorbents from solution, a functionalized nanocarbon with a magnetic response would be ideal. Although several magnetic carbon adsorbents [12,[31][32][33][34][35][36] have been reported for the removal of chromium, there is still a need to improve such adsorbents to have a high adsorption capacity.It is worth mentioning that recent studies have shown that zinc species is good dynamic molecular porogens to create extra micropores [37][38][39]. These results show that Zn ions turn into ZnO during pyrolysis process. Further temperature increase can lead to the reduction of ZnO nanoparticles in the presence of carbon materials (carbothermal reduction), accompanied by the evaporation of Zn, CO 2 , and CO. The evaporation of the Zn species would create additional nanochannels that contribute to the adMicroporous hollow carbon nanospheres were prepared through the polymerization of 2,4-dihydroxybenzoic acid and formaldehyde in the presence of ammonia and tactfully using chelating zinc species as dynamic porogens during the carbonization step to create extra micropores. The Cr(VI) maximum adsorption capacity of microporous hollow carbon spheres consequently increase from 139.8 mg g −1 of pristine hollow carbon spheres to 199.2 mg g −1 . Owing to the presence of the carboxyl groups in the polymer matrix, Zn 2+ ions can be easily introduced into the hollow polymer spheres through complexation process. During carbonization, high temperature treatment results in the reduction of Zn 2+ to metallic Zn and subsequent evaporation of Zn, consequently forming nanospaces and nanopaths in the carbon shell. As little as 8.6 wt.% Zn 2+ in the polymer matrix can increase the micropore volume by 133% and the specific surface area by 86%. The microporous hollow carbon spheres can be made magnetic by anchoring them to 14.0 wt.% γ-Fe2O3 nanoparticles, thus producing a highly efficient Cr(VI) adsorbent. The maximum adsorption capacity measured was 233.1 mg g −1 , which is significantly higher than other reported carbon-based adsorben...

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A Systematic Investigation of Decomposition of Nano Zn₄O(C₈H₄O₄)₃ Metal−Organic Framework

Cited by 92 publications

References 66 publications

Chemical and Thermal Stability of Isotypic Metal–Organic Frameworks: Effect of Metal Ions

Chemical and Thermal Stability of Isotypic Metal–Organic Frameworks: Effect of Metal Ions

Porous carbon derived from Metal–organic framework (MOF) for capacitive deionization electrode

Synthesis of magnetic hollow carbon nanospheres with superior microporosity for efficient adsorption of hexavalent chromium ions

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