Preparation of highly dispersed precipitated nanosilica in a membrane dispersion microreactor

Zhang, Tian; Wang, Yujun; Luo, Guangsheng; Bai, Shaoqing

doi:10.1016/j.cej.2014.07.027

Cited by 31 publications

(13 citation statements)

References 22 publications

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“…In addition, CMC has many excellent features such as film formation, emulsification, suspension, water retention, and bonding properties. Therefore, it is the most preferred polymer for food, medicine, detergent, paint, paper, flocculant, sizing agent, textile, and other industries [6][7][8][9][10][11]. On the other hand, polyvinyl alcohol (PVA) is a synthetic water-soluble polymer with many applications including textile pulps, adhesives, coatings, dispersants, and a series of medical materials with medical functions owing to its excellent adhesion, flexibility, and film-forming properties [12,13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Na2CO3 on the Microstructure and Macroscopic Properties and Mechanism Analysis of PVA/CMC Composite Film

Zhu

Che³

et al. 2020

Polymers

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Polyvinyl alcohol (PVA)/carboxyl methyl cellulose sodium (CMC)/Na2CO3 composite films with different contents of Na2CO3 were prepared by blending and solution-casting. The effect of Na2CO3 on the microstructure of PVA/CMC composite film was analyzed by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC), and atomic force microscopy (AFM). Its macroscopic properties were analyzed by water sorption, solubility, and dielectric constant tests. The results show that the microstructure of PVA/CMC/Na2CO3 composite films was different from that of PVA and PVA/CMC composite films. In addition, compared to PVA and PVA/CMC composite films, the water sorption of PVA/CMC/Na2CO3 composite films relatively increased, the solubility in water significantly decreased, and the dielectric properties significantly improved. All these results indicate that the hydrogen bonding interaction between PVA and CMC increased and the crystallinity of PVA decreased after the addition of Na2CO3. This was also a direct factor leading to increased water sorption, decreased solubility, and enhanced dielectric properties. The reaction mechanism of PVA, CMC, and Na2CO3 is proposed to further evaluate the effect of Na2CO3 on the microstructure and macroscopic properties of PVA/CMC/Na2CO3 composite films.

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Section: Introductionmentioning

confidence: 99%

Effect of Na2CO3 on the Microstructure and Macroscopic Properties and Mechanism Analysis of PVA/CMC Composite Film

Zhu

Che³

et al. 2020

Polymers

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“…For instance, sodium dodecyl sulfate (SDS) was used to obtain hexapod nanoparticles (Ho and Huang 2009); polyvinyl pyrrolidone (PVP) for octahedral and nanospheric nanoparticles (Sang et al 2017;Sui et al 2010) and cetyltrimethyl ammonium bromide (CTAB) for bi-pyramid nanoparticles (Jimenez-Cadena et al 2010). Membrane dispersion has advantages on the control synthesis of nanoparticles, for instance, SiO 2 nanoparticles and ZnO nanocrystals were precipitated in flat-sheet metal membrane micro-reactors (Zhang et al 2014;Wang et al 2010). And microparticles and nanoparticles of Cu 2 O were deposited and shaped in a ceramic membrane reactor (Li et al 2020b).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of CuxCo3−xO4 nanocatalyst for degradation of nitrogenous organic wastewater in Fenton-like membrane reactor

Zhou

Chen

et al. 2022

Appl Water Sci

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Membrane Fenton-like process with cobalt–copper spinel catalyst is proposed to degrade nitrogenous organic hazardous in wastewater. Cu-auxiliary cobalt oxide (CuxCo3–xO4) was synthesized with the dispersion co-precipitation method. As-prepared CuCo2O4 performed as the best catalyst for Fenton degradation on nitrogen-containing organic compound as methylene blue (C16H18N3ClS) in water and N,N-dimethylacetamide [CH3CON(CH3)2] in industrial wastewater. Lattice substation of Cu2+ to Co2+ ion increased the oxygen vacancies and catalytic activity. The catalyst stability was improved owing to hybrid polarization confinement (total metal elution less than 0.8 mg/L). Methylene blue in water (C0 = 100 mg/L) was completely decolorized in 50 min using 0.6 g/L CuCo2O4 and 0.09 M H2O2 at intrinsic pH 6.7. Degradation reaction rate constant was increased by two folds as k = 0.076 min−1 catalyzed by CuCo2O4 over k = 0.039 min−1 by Co3O4. DMAc-contaminant wastewater of high CODs 19,080 mg/L was treated using 2.4 g/L CuCo2O4 and 2.4 M H2O2 at intrinsic pH = 7.6. Removal rate of DMAc was enhanced from 81 to 99% in the ceramic membrane reactor when H2O2 was activated, and self-sweeping effect was suppressed. As a result, Total Organic Nitrogen (2900 mg/L) in the wastewater was mineralized by 99.9% with a fast transformation to inorganic NO3− ion. Biodegradability of the resistant organic wastewater was remarkably improved, and BOD/COD was increased by 18 folds.

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“…These applications have various requirements for the properties of silica, such as a large specific surface area, high pore volume, high dispersity, and narrow particle size distribution. − In industrial production, silica nanoparticles are mainly synthesized by the precipitation method of sodium silicate and sulfuric acid in which the nucleation and initial growth processes play a key role in determining the structure and properties of the resulting silica. Although there are many studies concerning the synthesis of silica with different properties, − there is a limited understanding of silica nucleation and initial growth in the very short initial time period (such as 1 s). As shown in Figure , it is generally believed that sodium silicate and sulfuric acid first react to produce molecular and ion monomers of ortho -silicic and meta -silicic acid.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Nucleation and Initial Growth of Nanosilica Using In Situ Small-Angle X-ray Scattering and Reactive Molecular Dynamics Simulation

et al. 2020

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A method based on the combination of in situ small-angle X-ray scattering (SAXS) and reactive molecular dynamics (MD) simulation is proposed to investigate the nucleation and initial growth of nanosilica. The formation and significant growth of silica nuclei within 1 s can be observed using in situ SAXS in a custom-designed sample cell. Meanwhile, reactive MD simulation confirms that the nucleation and initial growth take place over a very short time period and quantitatively describes the morphology of the formed particles. Both the experimental and simulation methods reveal changes in the particle size and number. A sudden increase in particle size is observed in the experiment, which corresponds to a decrease in particle number, indicating the transformation of the growth mode from ortho-silicic acid attachment to particle coalescence. The simulation snapshots also captures the process of particle coalescence, confirming the existence of this growth mode. The effects of the synthesis conditions, including temperature, sodium silicate concentration, and pH value, are studied and discussed in detail. The results show that the combination of in situ SAXS and reactive MD simulation is a useful method that provides detailed information on the preparation of precipitated silica and its regulatory mechanism.

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Preparation of highly dispersed precipitated nanosilica in a membrane dispersion microreactor

Cited by 31 publications

References 22 publications

Effect of Na2CO3 on the Microstructure and Macroscopic Properties and Mechanism Analysis of PVA/CMC Composite Film

Effect of Na2CO3 on the Microstructure and Macroscopic Properties and Mechanism Analysis of PVA/CMC Composite Film

Synthesis of CuxCo3−xO4 nanocatalyst for degradation of nitrogenous organic wastewater in Fenton-like membrane reactor

Investigation of the Nucleation and Initial Growth of Nanosilica Using In Situ Small-Angle X-ray Scattering and Reactive Molecular Dynamics Simulation

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