In situ loading of highly-dispersed CuO nanoparticles on hydroxyl-group-rich SiO2-AlOOH composite nanosheets for CO catalytic oxidation

Yan, Zhaoli; Yang, Huaming; Ouyang, Jing; Tang, Aidong

doi:10.1016/j.cej.2017.02.043

Cited by 111 publications

(30 citation statements)

References 76 publications

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“…Researchers, therefore, became interested in cheaper and greener silicon sources instead of silicon-containing chemical reagents. Natural silicate minerals, which have been widely used in various fields [16][17][18][19], were suitable for alternative silicon sources due to the advantage of abundant resources, cheapness, and high contents of silicon dioxide. Therefore, silicate minerals had been considered as green silicon sources to synthesize mesoporous silica materials.…”

Section: Introductionmentioning

confidence: 99%

Simple Synthesis and Characterization of Hexagonal and Ordered Al–MCM–41 from Natural Perlite

Chen

et al. 2019

Minerals

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Silica reagents are expensive and toxic for use in the synthesis of mesoporous silica materials. It is imperative to take an interest in green silicon sources. In this paper, we report the synthesis of hexagonal and ordered aluminum-containing mesoporous silica materials (Al–MCM–41) from natural perlite mineral without addition of silica or aluminum reagents. A pretreatment process involving acid leaching, alkali leaching, and strongly acidic cation exchange resins treatment was critical to obtain silicon and aluminum sources from natural perlite mineral. The Al–MCM–41 material was synthesized via a hydrothermal reaction with hexadecyl trimethyl ammonium bromide (CTAB) as the template and subsequent calcination. The resulting mesophase had a hexagonal and ordered mesoporous structure, confirmed by small-angle X-ray diffraction (SAXRD) and transmission electron microscopy (TEM). Al–MCM–41 material had a high Brunauer–Emmet–Teller (BET) surface area of 1024 m2/g, pore volume of 0.72 cm3/g and an average pore diameter of 2.8 nm with a pore size distribution centered at 2.5 nm. The thermal behavior of the as-synthesized samples during calcination was investigated by thermogravimetry (TG) and differential thermogravimetry (DTG) analysis. The Al–MCM–41 material showed a negative surface charge in aqueous solution with the pH value ranging from 2 to 13. The variations of chemical structures from natural perlite to Al–MCM–41 were traced by wide-angle X-ray diffraction (WAXRD) and Fourier-transform infrared spectroscopy (FTIR). A proposed mechanism for the synthesis of hexagonal and ordered mesoporous silica materials from natural perlite is discussed.

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Section: Introductionmentioning

confidence: 99%

Simple Synthesis and Characterization of Hexagonal and Ordered Al–MCM–41 from Natural Perlite

Chen

et al. 2019

Minerals

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“…Smectite has high hemostatic activity but is cytotoxic and may induce inflammation and thrombosis in vivo . Kaolinite (kaolin) [Al 2 Si 2 O 5 (OH) 4 ] is a 1:1‐type layered aluminum silicate nanoclay composed of an octahedral gibbsite Al(OH) 3 stacked atop a tetrahedral SiO 4 sheet that exhibits a typical 2D lamellar morphology, negatively charged surface, and high hydrophilicity . The kaolin‐based hemostat QuikClot Combat Gauze was approved by the FDA for external application in 2013 due to its efficiency in hemorrhage control without risk of thermal injury .…”

Section: Introductionmentioning

confidence: 99%

Emerging Nanoclay Composite for Effective Hemostasis

Long

Zhang

Huang

et al. 2017

Adv Funct Materials

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134

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Uncontrolled bleeding following trauma is associated with a high risk of death. Here, an emerging kaolinite nanoclay composite (iron oxide-kaolinite, α-Fe 2 O 3 -kaolin KAc ) is developed, based on the natural hemostat hematitum used in traditional Chinese medicine to effectively control hemorrhage. α-Fe 2 O 3 -kaolin KAc stops bleeding in ≈183 ± 16 s and exhibits higher hemostatic activity than the related compounds FeOOH-kaolin KAc (298 ± 14 s), γ-Fe 2 O 3 -kaolin KAc (212 ± 11 s), and Fe 3 O 4 -kaolin KAc (218 ± 15 s). This rapid effect is attributed to efficient absorption of the fluid in blood, activation of blood platelets, and induction of the coagulation cascade by kaolinite and the aggregation of red blood cells induced by α-Fe 2 O 3 . α-Fe 2 O 3 -kaolin KAc shows slight hemolysis (<0.11%) as compared to kaolinite (30%), which accelerates wound healing. The biocompatibility, hemostatic activity, and low cost of α-Fe 2 O 3 -kaolin KAc make it a safe and effective agent for preventing massive blood loss after traumatic injury.

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“…According to the results obtained by resolving overlapping peak and some previous reports [25][26][27][28], the C1s spectrum could be broken down into four peaks, as shown in Figure 2a. The electronic binding energies of the C1s spectrum was concentrated between 282 and 292 eV; indicating that the detectable organic carbon-containing chemical groups included C-C, C-O, C = O and O-C = O.…”

Section: Distribution Of Organic Carbon and Oxygen-containing Groups mentioning

confidence: 61%

Thermal Transformation of Carbon and Oxygen-Containing Organic Compounds in Sewage Sludge During Pyrolysis Treatment

et al. 2019

Energies

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Organic carbon (C) and oxygen (O) contained in sewage sludge strongly impact its thermal behavior during pyrolysis treatment. This study was aimed at getting an insight into the decomposition mechanism of organic compounds containing C and O during sludge pyrolysis using thermo-gravimetric Fourier transform infrared spectroscopy (TG-FTIR) and pyrolysis-gas-chromatography/mass spectrometry (Py-GC/MS) and helpfully improving energy conversion of sewage sludge. The temperature domains of transformation were determined and indications of the main compounds produced during each stage were obtained. Results showed that the volatile compounds that evolved after sludge pyrolysis were mainly distributed into six groups: alkenes, aromatic hydrocarbons, alcohols, aldehydes, phenols and carboxylic acids. Comparison in thermal behavior and composition of the evolved volatile compounds were observed. In the low temperature stage (<350 °C), compounds containing O–C=O accounted for the highest proportion in the evolved gas (55%). Over 350 °C, the production of C=C, –OH, and –C6H5 compounds gradually increased; but little was found of compounds containing O–C=O. Above 550 °C, as thermal chemical reaction involving oxygen-containing groups enhanced, compounds containing O–C=O and –OH tended to disappear, and an increasing amount of macromolecular polycyclic aromatic hydrocarbon was formed. Finally, the thermal transformation pathways of the oxygen and carbon-containing compounds were proposed.

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In situ loading of highly-dispersed CuO nanoparticles on hydroxyl-group-rich SiO2-AlOOH composite nanosheets for CO catalytic oxidation

Cited by 111 publications

References 76 publications

Simple Synthesis and Characterization of Hexagonal and Ordered Al–MCM–41 from Natural Perlite

Simple Synthesis and Characterization of Hexagonal and Ordered Al–MCM–41 from Natural Perlite

Emerging Nanoclay Composite for Effective Hemostasis

Thermal Transformation of Carbon and Oxygen-Containing Organic Compounds in Sewage Sludge During Pyrolysis Treatment

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