A continuous polymorphic transition of coordinating water molecules in CuSO4·5H2O

Saig, Avraham; Danon, Albert; Finkelstein, Y.; Kimmel, G.; Koresh, Jacob E.

doi:10.1016/s0022-3697(02)00415-8

Cited by 10 publications

(8 citation statements)

References 9 publications

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“…This drastic lowering of CuSO 4 ·5H 2 O decomposition temperature with melamine can be elucidated by the Cu(II)–amine complex . Formation of SO 3 is revealed with a weight loss of 7% (theoretical weight loss of SO 3 , 10.3%), with a signature of formation of CuO within 550–650 °C, which forms at a lower temperature due to the presence of melamine. − However, TGA analysis is done in an open system, which has a different environment with respect to that in the synthetic protocol followed by us, which is carried out in a closed system. From the XRD and XPS analyses, we can envisage the onset of the final reaction step at around 550 °C, the synthesis temperature for the nanocomposite.…”

Section: Resultsmentioning

confidence: 99%

One-Pot Fabrication of Perforated Graphitic Carbon Nitride Nanosheets Decorated with Copper Oxide by Controlled Ammonia and Sulfur Trioxide Release for Enhanced Catalytic Activity

Jana

Pal

2018

ACS Omega

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In this article, we have judiciously interfaced copper oxides with graphitic carbon nitride (g-C 3 N 4 ) from thermal reaction of melamine and copper sulfate in a one-pot protocol and manipulated the perforated sheet morphology thereafter. The CCN- X ( X = 30, 40, 50, 60, and 70, depending on the wt % of CuSO 4 ·5H 2 O) nanocomposites were prepared by homogenously mixing different percentages of CuSO 4 ·5H 2 O with melamine from a solid-state thermal reaction in a furnace in air. Drastic lowering of CuSO 4 decomposition temperature due to Cu(II)–amine complex formation and subsequent reduction of Cu(II) species by in situ produced ammonia (NH 3 ) resulted in the production of CuO and catalytic amount of Cu 2 O, homogeneously dispersed within the perforated g-C 3 N 4 nanosheet. How perforated sheet morphology evolved by combined effect of NH 3 , released from thermal condensation of melamine ensuring two-dimensional (2D) growth, and sulfur trioxide (SO 3 ), expelled from CuSO 4 ·5H 2 O facilitating the perforation, yielding better catalytic performance, has been elucidated. Excess NH 3 from added NH 4 Cl removed perforation and ensued a marked decrease in efficacy. However, a high proportion of CuSO 4 ·5H 2 O ruptured the framework of 2D sheets because of excess SO 3 evolution. Among the different nanocomposites synthesized, CCN-40 (CuO–Cu 2 O/g-C 3 N 4 ) showed the highest catalytic activity for 4-nitrophenol reduction. Thus, enhanced efficiency of the copper oxide catalyst by interfacing it with an otherwise inactive g-C 3 N 4 platform was achieved.

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Section: Resultsmentioning

confidence: 99%

One-Pot Fabrication of Perforated Graphitic Carbon Nitride Nanosheets Decorated with Copper Oxide by Controlled Ammonia and Sulfur Trioxide Release for Enhanced Catalytic Activity

Jana

Pal

2018

ACS Omega

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“…A mass loss (2.5%) at 215-270 °C is assigned to loss of the last water molecule (eqn (14)). 44,45 The last mass loss (10.1%) at 600-780 °C is attributed to the decomposition of CuSO 4 into CuO (theoretical loss 10.3%, eqn (15)). Note that the weights of all samples from different precursors do not change further after 800 °C, as shown in Fig.…”

Section: Thermal Behaviors Of the Catalyst Precursorsmentioning

confidence: 99%

Low-temperature CO oxidation on CuO/CeO₂catalysts: the significant effect of copper precursor and calcination temperature

Sun

Mao

et al. 2015

Catal. Sci. Technol.

141

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“…This result is in agreement with the literature. According to Saig et al, 18 the fusion of CuSO 4 Á5H 2 O is divided into three stages, each corresponding to dehydration. Depending on the heating rates, four of the coordinating water molecules are released along the 100-150 C temperature range, whereas the remaining one, the most strongly bonded, is released above 230-250 C. The absence of peaks from dehydration (100-150 C) on the DSC curves of the composites is due to evaporation of the water molecules at least related to the manufacturing method of composite.…”

Section: Ldpe and Ldpe/lignin/mape/cuso 4 á5h 2 O Composite's Crystallinity Measurementsmentioning

confidence: 99%

Study of lignin dispersion in low-density polyethylene

Diop

Mijiyawa

Koffi

et al. 2014

Journal of Thermoplastic Composite Materials

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A maximum of 20% (w/w) lignin was used as a filler in low-density polyethylene (LDPE), together with 3-6% maleic anhydride-grafted LDPE as compatibilizer and 3-10% copper(II) sulphate pentahydrate (CuSO 4 Á5H 2 O) as lignin's dispersing agent. The resulting composites were investigated for both their mechanical properties and their melting point following the ASTM standards as well as their behaviour was compared with neat LDPE. The results reveal that addition of compatibilizer significantly improved the mechanical properties of lignin, yielding closer values to those of neat LDPE. In fact, the addition of 3% maleated polyethylene induced a 37% increase of the Young's modulus, whilst 3% CuSO 4 Á5H 2 O provides a good lignin dispersion. The above observations are further supported by the scanning electron micrographs of the blend specimens. Finally, the differential scanning calorimetry analysis revealed that the melting temperature and the crystallinity of LDPE slightly increase with the addition of 3% CuSO 4 Á5H 2 O.

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A continuous polymorphic transition of coordinating water molecules in CuSO4·5H2O

Cited by 10 publications

References 9 publications

One-Pot Fabrication of Perforated Graphitic Carbon Nitride Nanosheets Decorated with Copper Oxide by Controlled Ammonia and Sulfur Trioxide Release for Enhanced Catalytic Activity

One-Pot Fabrication of Perforated Graphitic Carbon Nitride Nanosheets Decorated with Copper Oxide by Controlled Ammonia and Sulfur Trioxide Release for Enhanced Catalytic Activity

Low-temperature CO oxidation on CuO/CeO₂catalysts: the significant effect of copper precursor and calcination temperature

Study of lignin dispersion in low-density polyethylene

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A continuous polymorphic transition of coordinating water molecules in CuSO4·5H2O

Cited by 10 publications

References 9 publications

One-Pot Fabrication of Perforated Graphitic Carbon Nitride Nanosheets Decorated with Copper Oxide by Controlled Ammonia and Sulfur Trioxide Release for Enhanced Catalytic Activity

One-Pot Fabrication of Perforated Graphitic Carbon Nitride Nanosheets Decorated with Copper Oxide by Controlled Ammonia and Sulfur Trioxide Release for Enhanced Catalytic Activity

Low-temperature CO oxidation on CuO/CeO2catalysts: the significant effect of copper precursor and calcination temperature

Study of lignin dispersion in low-density polyethylene

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Low-temperature CO oxidation on CuO/CeO₂catalysts: the significant effect of copper precursor and calcination temperature