A flexible magnesium silicate coated electrospun fiber adsorbent for high-efficiency removal of a toxic cationic herbicide

Li, Y.; Zhao, Rui; Shen, Chao; Sun, Bolun; Zhang, N.; Qiu, Jianying; Wang, C.; Li, Xiaotian

doi:10.1039/c7nj03168h

Cited by 33 publications

(15 citation statements)

References 45 publications

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“…X‐ray photoelectron spectroscopy (XPS) surface survey spectrum of Mg−Si−MTW‐50 confirms the presence of various constituent elements in the framework structure (Figure S2a). The high‐resolution spectrum of Si 2p exhibits a broad peak, which can be deconvoluted into two peaks centred at binding energies of 103.1 eV and 104.0 eV corresponding to Si−O−Mg and Si−O−Si, respectively . Moreover, a distinguish peak centred at 1305.0 eV corresponds to Mg 2+ is present in Si−O−Mg .…”

Section: Resultsmentioning

confidence: 99%

Bi‐Functional Magnesium Silicate Catalyzed Glucose and Furfural Transformations to Renewable Chemicals

Kumar

Srivastava

2020

ChemCatChem

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Bio-refinery is attracting significant interest to produce a wide range of renewable chemicals and fuels from biomass that are alternative to fossil fuel derived petrochemicals. Similar to petrochemical industries, bio-refinery also depends on solid zeolite catalysts. Acid-base catalysis plays pivotal role in producing a wide range of chemicals from biomass. Herein, the Mg framework substituted MTW zeolite is synthesized and explored in the valorisation of glucose and furfural. Bi-functional (acidic and basic) characteristics are confirmed using pyridine adsorbed FTÀ IR analysis and NH 3 and CO 2 temperatureprogrammed desorption techniques. Textural properties and morphological information are retrieved from N 2-sorption, X-ray photoelectron spectroscopy, and electron microscopy. The activity of the catalyst is demonstrated in the selective isomerisation of glucose to fructose in ethanol. Glucose is converted to methyl lactate in high yield using the same catalyst. Further, the bi-functional activity of this catalyst is demonstrated in the production of fuel precursor by the reaction of furfural and isopropanol. MgÀ MTW zeolite exhibits excellent activity in the production of all these chemicals and fuel derivative. The catalyst exhibits no significant loss in the activity even after five recycles. One simple catalyst affording three renewable synthetic intermediates from glucose and furfural will attract significant attention to catalysis researchers and industrialists.

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Section: Resultsmentioning

confidence: 99%

Bi‐Functional Magnesium Silicate Catalyzed Glucose and Furfural Transformations to Renewable Chemicals

Kumar

Srivastava

2020

ChemCatChem

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“…These peaks suggested that the solid was a mixture of MgO, Mg(OH) 2 , and magnesium silicate, which is in agreement with the FTIR and XRD as well as TGA data. At the same time, the Si 2p peak of the solid was deconvoluted into two peaks, at 102.10 and 102.36 eV, corresponding to the Si–O and Mg–O–Si bonds of the formed magnesium silicate, respectively . Hydrated MgO–SiO 2 showed a very similar pattern in terms of the Si 2p and Mg 2p peaks with MgO–SiO 2 , suggesting their similar silica removal mechanism.…”

Section: Resultsmentioning

confidence: 87%

Effect of MgO Slaking on Silica Removal during Warm Lime Softening of SAGD Produced Water

Zhang

Pernitsky

Jafari³

et al. 2021

Ind. Eng. Chem. Res.

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MgO is added during warm lime softening (WLS) to remove silica from steam-assisted gravity drainage produced water. Although it is a general practice in the oil sand industry to avoid MgO slaking to ensure maximum silica removal, there has been no study on how slaking of MgO affects silica removal. This work aims to understand the effect of MgO slaking on silica removal and silica removal mechanism by MgO. Silica removal by slaked and nonslaked MgO was studied at different pH values (8.0–11.3) with different dosages (100–1000 ppm) and contact time (15–120 min) at WLS operating temperatures (65–85 °C). Silica removal takes place through two possible competing mechanisms: adsorption on the formed Mg(OH)2 or precipitation by forming magnesium silicate precipitates. Slaked MgO achieves lower silica removal percentage than nonslaked MgO at WLS conditions because MgO slaking makes silica adsorption on the formed Mg(OH)2 more predominant.

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“…The removal of dissolved sulfides by adsorption was the object of many works by solutions from different origins: synthetic solutions produced in the laboratory (from sodium sulfide 5 ) and industrial solutions rejected from refinery 12 or tanneries wastewater, 13 with concentrations from 140 μg/l 14 to 1000 mg/l 12 . Various adsorbents have been used for the uptake of sulfides, such as granular ferric hydroxide, 15 porous graphitic carbon/manganese dioxyde, 16 bio‐sorbents, 13 and AC 5,12 . The adsorbents proved efficient removal capacity of sulfides from 29.1 mg/g for granular ferric hydroxide 15 to 500.1 mg/g for graphitic carbon 16 …”

Section: Introductionmentioning

confidence: 99%

“…Various adsorbents have been used for the uptake of sulfides, such as granular ferric hydroxide, 15 porous graphitic carbon/manganese dioxyde, 16 bio‐sorbents, 13 and AC 5,12 . The adsorbents proved efficient removal capacity of sulfides from 29.1 mg/g for granular ferric hydroxide 15 to 500.1 mg/g for graphitic carbon 16 …”

Section: Introductionmentioning

confidence: 99%

Removal of dissolved sulfides from synthetic and industrial solutions by activated carbon derived from Tunisian olive stone

Lagha

Ouederni

Abdallah

2021

Env Prog and Sustain Energy

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The present work aimed at evaluating the performance of activated carbons (AC) derived from Tunisian olive stone in the removal of dissolved sulfides from synthetic and industrial solutions. The ACs were produced by physical (CAP) and chemical (CAC) activations and characterized by N2 adsorption–desorption, scanning electron microscope/X‐ray dispersive energy analysis, Fourier transform infrared spectrometer, and Boehm titration. The ACs dispose of well‐developed specific surface area (1100–730 m2/g) with dispersed oxygen surface groups. Batch adsorption test performed by synthetic sulfides solutions reveals significant adsorption capacities. The kinetic data were modeled using the pseudo‐first order, the pseudo‐second order, the intra‐particle diffusion, as well as the Boyd model. The results prove that sulfides adsorption is described by the pseudo‐second order equation. Moreover, the sulfides adsorption mechanism follows the intra‐particle diffusion and the external diffusion. The adsorption equilibrium data were modeled by Freundlich, Langmuir, Temkin, and D‐R models. The equilibrium data fitted the Langmuir model with monolayer adsorption capacities of 20.83 mg/g for CAP and 22.72 mg/g for CAC. In the dynamic test, the sulfides adsorption by ACs from industrial spent caustic solutions decreased to 2.81 and 7.32 mg of sulfides/g of CAC and CAP. Therefore, the adsorption process is not a promising treatment method for sulfides removal from the phosphoric acid plant wastewater.

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A flexible magnesium silicate coated electrospun fiber adsorbent for high-efficiency removal of a toxic cationic herbicide

Abstract: A novel magnesium silicate/PAN composite electrospun fiber adsorbent was prepared and systematically investigated for the removal of the cationic herbicide diquat.

Cited by 33 publications

References 45 publications

Bi‐Functional Magnesium Silicate Catalyzed Glucose and Furfural Transformations to Renewable Chemicals

Bi‐Functional Magnesium Silicate Catalyzed Glucose and Furfural Transformations to Renewable Chemicals

Effect of MgO Slaking on Silica Removal during Warm Lime Softening of SAGD Produced Water

Removal of dissolved sulfides from synthetic and industrial solutions by activated carbon derived from Tunisian olive stone

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