Effect of silane-modification of diatomite on its composites with thermoplastic polyurethane

Kucuk, Fatma; Sismanoglu, Sedef; Kanbur, Yasin; Tayfun, Ümit

doi:10.1016/j.matchemphys.2020.123683

Cited by 40 publications

(21 citation statements)

References 60 publications

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“…Hybrid organic/inorganic composites made from polyisocyanate and sodium silicate have low-cost, good permeability, low heat release and fire resistance, but have poor mechanical properties due to the interface incompatibility between organic and inorganic phase 17 . Various new interface modification means 18 , 19 and additives have been used as an emulsifier for the improvement of the SS/PU composites performance, such as phosphate 20 , vinyl ester 21 , melamine formaldehyde 22 , epoxy 23 . Although several additives have shown effective mechanical reinforcements in SS/PU composites, it is difficult to simultaneously improve the compressive strength, flexural strength, flexural modulus and the fracture toughness of the SS/PU composites.…”

Section: Introductionmentioning

confidence: 99%

Mechanism confirmation of organofunctional silanes modified sodium silicate/polyurethane composites for remarkably enhanced mechanical properties

Liang

Gao

Sun

et al. 2021

Sci Rep

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Hybrid reinforced sodium silicate/polyurethane (SS/PU) composites mainly derived from low-cost SS and polyisocyanate are produced by a one-step method based on the addition of 3-chloropropyltrimethoxysilane (CTS). The wettability of SS on PU substrate surface is much improved as CTS content increases from 0.0 to 3.5 wt%. Furthermore, with 2.5 wt% of CTS optimal addition, the fracture surface morphology and elemental composition of the resulting SS/PU composites are characterized, as well as mechanical properties, chemical structure and thermal properties. The results indicate that the CTS forms multiple physical and chemical interactions with the SS/PU composites to induce an optimized organic–inorganic hybrid network structure thus achieving simultaneous improvement of compressive strength, flexural strength, flexural modulus and fracture toughness of the SS/PU composites, with the improvement of 12.9%, 6.6%, 17.5% and 9.7%, respectively. Moreover, a reasonable mechanism explanation for CTS modified SS/PU composites is confirmed. Additionally, the high interface areas of the organic–inorganic phase and the active crosslinking effect of the CTS are the main factors to determine the curing process of the SS/PU composites.

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Section: Introductionmentioning

confidence: 99%

Mechanism confirmation of organofunctional silanes modified sodium silicate/polyurethane composites for remarkably enhanced mechanical properties

Liang

Gao

Sun

et al. 2021

Sci Rep

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“…Figure 1 shows that the two XRD shapes are similar, indicating that the organic modification of BFA does not destroy the original structure of DE and removes some quartz impurities therefrom.Figure 2 shows scanning electron microscopy (SEM) images of DE and BFA‐DE; the surface of DE is shown to contain many micro–nano pore structures. The pore size near the edge of the disk is small and uniform, while the pore size in the center of the disk is large 30 . As can be seen from Fig.…”

Section: Resultsmentioning

confidence: 71%

“…The pore size near the edge of the disk is small and uniform, while the pore size in the center of the disk is large. 30 As can be seen from Fig. 2(b), the surface of the modified DE is uniformly covered by tiny particles, the surface is rough, and the original pore structure of DE cannot be seen.…”

Section: Sample Characterizationmentioning

confidence: 97%

“…20 mg DE and BFA-DE adsorbent was added, respectively, and oscillated in a constant-temperature oscillating chamber (25 °C) for 6 h. The absorbance of the filtrate was measured at 360 nm through a 0.45 μm filter membrane, and the adsorption capacity was calculated according to Eqn (2).To study the effect of different reaction temperatures on the adsorption of TC, we prepared 20 mg L −1 TC hydrochloride solution, adjusted the solution to pH 5, then added 20 mg BFA-DE adsorbent as appropriate. At different temperatures (10,20,25,30,35,40,45,50, 55 and 60 °C), reaction adsorption for 6 h was conducted. Using the aforementioned method to detect the absorbance of the solution, the adsorption volume was calculated.…”

Section: Sample Characterizationmentioning

confidence: 99%

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Preparation of biochemical fulvic acid‐modified diatomite and its adsorption characteristics for tetracycline in water

Gao

Pan

Zhu

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND: Diatomite and biochemical fulvic acid were used as raw materials to prepare biochemical fulvic acid-modified diatomite using by the sol-gel method. The structure and properties of samples were investigated by X-ray diffraction, scanning electron microscopy, etc. The effects of solution pH and reaction temperature on the adsorption performance of adsorption materials were evaluated by taking tetracycline as the target pollutant. The adsorption kinetics, adsorption rate mechanism and adsorption isotherm of tetracycline were revealed. RESULTS:The results showed that the main form of diatomite is amorphous SiO 2 . The surface and channels of diatomite were loaded with biochemical fulvic acid, and the specific surface area of the modified material increased from 9.182 to 13.774 m 2 g −1 , while the average pore size decreased from 10.972 to 7.15 nm. The pH of the tetracycline solution was 5 and the initial concentration was 20 mg L −1 ; the adsorption capacity of the modified sample increased 1.93-fold to 29.84 mg g −1 . When the adsorption temperature was increased from 10 to 60 °C, the adsorption capacity of the modified material increased nearly fourfold, reaching 78.8 mg g −1 .CONCLUSION: Quasi-second-order reaction kinetics has a correlation coefficient R 2 of 0.993, which suggests a good fit to the adsorption process of tetracycline by the modified diatomite. Both Freundlich and Redlich-Peterson adsorption isotherm equations can elucidate the adsorption process of the composites. The adsorption is heterogeneous adsorption on the surface, mainly multi-layer adsorption and electrostatic attraction adsorption.

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“…A similar study on modifying the synthesised m-DE with APTES and using this material to remove pesticides from aqueous systems has not been found in the literature. This aspect of the study also demonstrates how diatomite modified with silane structures can be used in various fields (Mu et al, 2018;Kucuk et al, 2020). However, when the advantages of magnetic separation were considered, a study with exciting results emerged.…”

Section: Introductionmentioning

confidence: 78%

Endosulfan Elimination Using Amine-Modified Magnetic Diatomite as an Adsorbent

Alacabey

2022

Front. Chem.

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Pesticides are among the most dangerous developing toxins since they are very hazardous to the environment and threaten human health. In this study, researchers successfully manufactured surface-modified magnetic diatomite (m-DE-APTES) and used them as a sorbent to extract endosulfan from an aqueous solution. There is no other study like it in the scholarly literature, and the results are astounding. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), electron spin resonance (ESR), and surface area measurements were used to analyze magnetic diatomite particles with surface modification. According to the analysis results, magnetic diatomite has a wide surface area and a porous structure. Furthermore, m-DE-APTES has a higher endosulfan adsorption capacity (97.2 mg g−1) than raw diatomite (DE) (16.6 mg g−1). Adsorption statistics agree with Langmuir adsorption isotherm (R2 = 0.9905), and the adsorption occurred spontaneously at −2.576 kj mol−1 in terms of ΔGo. Finally, m-DE-APTES are a viable alternative adsorbent for removing pesticides from aqueous solutions.

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Effect of silane-modification of diatomite on its composites with thermoplastic polyurethane

Cited by 40 publications

References 60 publications

Mechanism confirmation of organofunctional silanes modified sodium silicate/polyurethane composites for remarkably enhanced mechanical properties

Mechanism confirmation of organofunctional silanes modified sodium silicate/polyurethane composites for remarkably enhanced mechanical properties

Preparation of biochemical fulvic acid‐modified diatomite and its adsorption characteristics for tetracycline in water

Endosulfan Elimination Using Amine-Modified Magnetic Diatomite as an Adsorbent

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