One-step preparation of a novel SrCO3/g-C3N4 nano-composite and its application in selective adsorption of crystal violet

Lu, Pei; Hu, Xueli; Li, Yujie; Zhang, Meng; Li, Xiaoping; He, Youzhou; Dong, Fan; Fu, Min; Zhang, Zhi

doi:10.1039/c7ra11565b

Cited by 61 publications

(23 citation statements)

References 75 publications

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“…Besides, the 1070 cm −1 peak described asymmetric stretching vibration of CO 3 2− could be seen in the pattern. However, the absorption band at 1463 cm −1 for CO 3 −2 symmetric stretching vibrant seems to be overlapped by the 1463 cm −1 peak of SF 35,36 …”

Section: Resultsmentioning

confidence: 92%

Novel bilayer electrospun poly(caprolactone)/ silk fibroin/ strontium carbonate fibrous nanocomposite membrane for guided bone regeneration

Etemadi

Mehdikhani

Poorazizi

et al. 2020

J of Applied Polymer Sci

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In this study, a thin layer with a thickness of about 120 μm of poly(caprolactone) (PCL) was fabricated by electrospinning method. Then, a fibrous nanocomposite composed of PCL/silk fibroin/strontium carbonate (PCL/SF/SrCO3) was electrospun on the prepared layer. Then, they were characterized. The mechanical properties, water uptake, degradation rate, wettability, porosity, and bioactivity of the electrospun membrane were scrutinized in vitro. Cytotoxicity of the samples was assessed by using osteoblast‐like cells (SAOS‐2) and L929 fibroblasts. Moreover, the cell adhesion, alkaline phosphatase (ALP) activity, and calcium deposition through alizarin red staining were conducted. Results revealed that the bilayer structure doubled the optimum mechanical properties and the addition of SrCO3 up to 15%–20% increased ALP activity, calcium deposition, and bioactivity. According to the results, the nanofibrous bilayer membrane containing 20 wt% SrCO3, 20 wt% SF, and 60 wt% PCL was chosen as the optimum sample. Therefore, this membrane could be applied in guided bone regeneration (GBR).

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Section: Resultsmentioning

confidence: 92%

Novel bilayer electrospun poly(caprolactone)/ silk fibroin/ strontium carbonate fibrous nanocomposite membrane for guided bone regeneration

Etemadi

Mehdikhani

Poorazizi

et al. 2020

J of Applied Polymer Sci

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“…The observed main diffraction peaks of the SrCO 3 (Figure S1B) are positioned at 2θ angles of 25.21°, 25.89°, 29.61°, 31.51°, 34.48°, 35.09°, 36.23°, 36.60°, 41.32°, 44.05°, 45.65°, 46.7°, 47.7°, 49.98°, which correspond to the planes of (111), (021), (002), (012), (102), (200), (112), (190), (220), (221), (041), (202), (132), (113), respectively. Such data can be attributed to the orthorhombic phase of SrCO 3 . In order to rely on the information of the phase purity and crystallinity, we have performed a Rietveld refinement.…”

Section: Resultsmentioning

confidence: 99%

“…FT‐IR spectra were recorded for SrCO 3 and Au−Pd/SrCO 3 materials, which are shown in Figure S1A. Both samples present the peaks that correspond to CO 3 2− : 698 (706), 857 (855), 1071, 1454 (1476), 1774 (1772) cm −1 , being the parenthesized values for Au−Pd/SrCO 3 catalyst, when it differs from the SrCO 3 itself . Such differences can be associated with the interaction between the support defects and metal NPs, changing the energy of the SrCO 3 surface, causing slight shiftings .…”

Section: Resultsmentioning

confidence: 99%

“…Both samples present the peaks that correspond to CO 3 2À : 698 (706), 857 (855), 1071, 1454 (1476), 1774 (1772) cm À 1 , being the parenthesized values for AuÀ Pd/SrCO 3 catalyst, when it differs from the SrCO 3 itself. [24] Such differences can be associated with the interaction between the support defects and metal NPs, changing the energy of the SrCO 3 surface, causing slight shiftings. [25] The results suggest the achievement of a unique phase for the support used, which had to be confirmed.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

“…To elucidate such feature, XRD patterns of the SrCO 3 containing AuÀ Pd NPs were recorded in order to analyze the [24] In order to rely on the information of the phase purity and crystallinity, we have performed a Rietveld refinement. Table 2 shows the lattice parameters, unit structural volume, site occupancy and atomic positions determined from the refinement.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

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Au−Pd Selectivity‐switchable Alcohol‐oxidation Catalyst: Controlling the Duality of the Mechanism using a Multivariate Approach

et al. 2019

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Supported gold‐palladium nanoparticles are highly selective catalysts for the oxidation of alcohols. However, little is known about how integrated reaction conditions can affect the chemoselectivity of a specific catalytic system. Herein, a novel Au−Pd selectivity‐switchable catalyst supported on SrCO3 is reported; and a multivariate optimization was suggested as the key process to better understand the formation of the products. The optimization approach considered temperature, pressure, time of reaction, and Au : Pd molar ratio, and settled that the temperature and Au : Pd molar ratio showed an important effect on the ester yield, while just the metal molar ratio significantly influenced the selectivity for the aldehyde. Thus, taking into consideration the experimental data and optimized conditions, we were able to efficiently switch the selectivity by just changing the pressure of the system in a benzyl alcohol oxidation reaction. In addition, we proposed that the presence of O2 implies that there are two catalytic pathways, which leads to different selectivity, allowing us to bring some mechanistic insights dealing with the duality of the mechanism. Such outcomes are based on dense experimental results and characterizations (FT‐IR, Rietveld refinement, XPS, H2‐TPR, and EDS‐STEM). The catalyst was also very stable, presenting activity up to 6 runs without loss of activity and selectivity, under certain reaction conditions.

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A review of the use of SrO in catalysts for biodiesel production

Tavizón‐Pozos,

Cruz‐Aburto

2023

Biofuels Bioprod Bioref

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SrO has attracted attention for its use as a heterogeneous catalyst in producing biodiesel from transesterification owing to its high alkaline character and low solubility in methanol. In studies conducted in this decade, reaction conditions such as the methanol–oil molar ratio, reaction time, catalyst loading and temperature have been optimized in these systems. Furthermore, several works have been carried out to improve the physicochemical properties and increase the leaching resistance of this material. Thus, the new trends in using SrO in transesterification reactions are that this oxide should be supported or combined with Al2O3, TiO2, ZrO2, or Fe2O3, CaO, metal–organic frameworks, zeolites or La2O3. It has been observed that strontium can form mixed crystalline phases with these oxides by increasing the (M2+O2−) pairs and Lewis basicity of the oxygens, resulting in increased basicity and catalytic activity. Moreover, the transition metal oxides may provide Lewis acidity. Hence, these strontium‐containing catalytic systems have demonstrated a bifunctionality that can perform esterification and transesterification reactions at the same time. In addition, the combination of these oxides decreases the leaching of the catalyst. Other materials such as metal–organic frameworks, zeolites, and La2O3 have been studied as SrO supports, showing that they can be used in oil transesterification reactions.

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One-step preparation of a novel SrCO₃/g-C₃N₄ nano-composite and its application in selective adsorption of crystal violet

Abstract: A novel kind of nanoparticle SrCO3/g-C3N4 was prepared using strontium carbonate (SrCO3) and melamine as raw materials via one-step calcination.

Cited by 61 publications

References 75 publications

Novel bilayer electrospun poly(caprolactone)/ silk fibroin/ strontium carbonate fibrous nanocomposite membrane for guided bone regeneration

Novel bilayer electrospun poly(caprolactone)/ silk fibroin/ strontium carbonate fibrous nanocomposite membrane for guided bone regeneration

Au−Pd Selectivity‐switchable Alcohol‐oxidation Catalyst: Controlling the Duality of the Mechanism using a Multivariate Approach

A review of the use of SrO in catalysts for biodiesel production

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