Cuprous oxide microparticles with different morphologies were prepared by solvothermal method using copper acetate, triethanolamine, and alcohol as raw materials. The morphology and crystalline phase of the products w...
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Cuprous oxide microparticles with different morphologies were prepared by solvothermal method using copper acetate, triethanolamine, and alcohol as raw materials. The morphology and crystalline phase of the products were examined by SEM and XRD separately;the results show that, at an appropriate reaction temperature, choosing different alcohols will lead to forming micron spherical cuprous oxide. Furthermore, with increasing hydroxyl in alcohol, the reaction temperature for forming spherical cuprous oxide will decrease gradually. Meanwhile, it also shows that alcohols play a role in the reaction process for the formation of cuprous oxide microcrystal.
Copolymers of 9,9-dioctylfluorene (DOF) and 2-thienyl-benzothiadiazole (DBT) were synthesized by Suzuki reaction and end-capped by N-hexyl-carbazole and benzene, which were abbreviated as PDOF-DBT-Cz and PDOF-DBT-B, r...
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Copolymers of 9,9-dioctylfluorene (DOF) and 2-thienyl-benzothiadiazole (DBT) were synthesized by Suzuki reaction and end-capped by N-hexyl-carbazole and benzene, which were abbreviated as PDOF-DBT-Cz and PDOF-DBT-B, respectively. The photophysical, electrochemical and thermal properties of the copolymers were studied. The results indicated that replacement of N-hexyl-carbazole as end-capping group of PDOF-DBT can vary light color and improve luminescence efficiency.
The laccase-catalyzed conversion of bisphenol A （BPA） in aqueous solutions was studied in the absence and presence of nonionic surfactant Triton X-100. It was found that the addition of Triton X-100 into the reactio...
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The laccase-catalyzed conversion of bisphenol A （BPA） in aqueous solutions was studied in the absence and presence of nonionic surfactant Triton X-100. It was found that the addition of Triton X-100 into the reaction system increased the conversion of BPA, especially near the critical micelle concentration of Triton X-100. Also it was found that the stability of laccase was greatly improved in the presence of TritonX-100. Studies on the endogenous fluorescence emission of laccase indicated that there existed an interaction between Triton X-100 and laccase, which was beneficial to folding and stabilizating of laccase. The binding of Triton X-100 to the laccase surface also mitigated the inactivation effect caused by the free radicals and polymerization products. Under otherwise identical conditions, a lower dosage of laccase was needed for the higher conversion of BPA in the presence of Triton X-100.
Nano-Al13 was separated and purified by four methods to investigate its characteristic, and was analyzed by Al-Ferron timed complexation spectrophotometer, ^27Al-NMR （nuclear magnetic resonance）, and transmission el...
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Nano-Al13 was separated and purified by four methods to investigate its characteristic, and was analyzed by Al-Ferron timed complexation spectrophotometer, ^27Al-NMR （nuclear magnetic resonance）, and transmission electron microscopy （TEM）. Coagulation efficiency of nano-Al13, polyaluminum chloride （PAC）, and AlCl3 in synthetic water were also investigated by jar test. The dynamic process and aggregation state of kaolin suspensions coagulating with nano-Al13, PAC, and AlCl3 were also investigated. The experimental results indicated that the efficiency of gel column chromatography method was the highest for separating PAC solution with low Al concentration. Ethanol and acetone method was simple and could separated PAC solution with different Al concentrations, while silicon alkylation white block column chromatography method could separate PAC solution only with low Al concentration. The SO4^2-/Ba^2＋ displacement method could separate PAC solution with high Al concentration, but extra inorganic cation and anion could be introduced into the solution during the separation. The coagulation efficiency and dynamic experimental results showed that nano- Al13 with a high positive-charged species was the main species of electric neutralization in coagulation process, and it could reduce the turbidity and increase the effective particles collision rate efficiently in coagulation process. Its coagulation speed and the particle size of coagulant formed were of greatest value in this study.
Hydrotalcite‐like compounds (HTlc) were first modified by sodium dodecyl sulfate (SDS), then the intercalation of imidacloprid (IM) into modified HTlc was carried out in mixed solvent of toluene/ethanol by an evapora...
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Hydrotalcite‐like compounds (HTlc) were first modified by sodium dodecyl sulfate (SDS), then the intercalation of imidacloprid (IM) into modified HTlc was carried out in mixed solvent of toluene/ethanol by an evaporating solvent enhanced intercalation method, obtaining IM‐SDS‐HTlc nanohybrids. It was found that the nanohybrids could well control the release of imidacloprid, demonstrating that the nanohybrids are a potential pesticide controlled‐release formulation. The release of imidacloprid from IM‐SDS‐HTlc nanohybrids is dependent on the pH and the presence of electrolyte in release medium. Acidic medium and the presence of electrolytes induce the higher release rate of imidacloprid. The release process of imidacloprid from IM‐SDS‐HTlc nanohybrids can be described by pseudo‐second‐order release kinetics.
Nano-carbon materials were synthesized by the catalytic decomposition of acetylene at 400℃ by using Fe/Al2O3 as catalyst. The product was refluxed in 36% concentrated HCl at 60℃ for 48 h in order to re-move the cata...
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Nano-carbon materials were synthesized by the catalytic decomposition of acetylene at 400℃ by using Fe/Al2O3 as catalyst. The product was refluxed in 36% concentrated HCl at 60℃ for 48 h in order to re-move the catalyst support. The samples were examined by scanning and high resolution transmission electron microscopy,energy dispersive spectroscopy and X-ray diffraction. The results show that nano onion-like fullerenes encapsulating a Fe3C core were obtained. These had a structure of stacked graphitic fragments,with diameters ranging from 15―50 nm. When the product was further heat-treated at 1100℃ for 2 h,nano onion-like fullerenes with a clear concentric graphitic layer structure were obtained. The growth mechanism of nano onion-like fullerenes encapsulating metal cores is suggested to follow a vapor-solid growth model.
Mg‐Fe layered double hydroxide (LDH) with a Mg/Fe molar ratio of 3:1 was synthesized by using a coprecipitation method and the sorption removal of Pb(II) by the LDH sample from Pb(NO 3 ) 2 solution was investigated. ...
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Mg‐Fe layered double hydroxide (LDH) with a Mg/Fe molar ratio of 3:1 was synthesized by using a coprecipitation method and the sorption removal of Pb(II) by the LDH sample from Pb(NO 3 ) 2 solution was investigated. It was found that Mg‐Fe LDH showed a good sorption ability for Pb(II) from Pb(NO 3 ) 2 solution, indicating that the use of LDH as a promising inorganic sorbent for the removal of heavy metal ions is possible. The sorption kinetics and the sorption isotherm of Pb(II) on the LDH sample obeyed the pseudo‐second order kinetic model and Aranovich‐Donohue equation, respectively. The sorption mechanism of Pb(II) on the LDH may be attributed to the surface‐induced precipitation and the chemical binding adsorption, and the removal ability arising from the surface‐induced precipitation is much higher than that from the chemical binding adsorption.
The transparent rare earth polymers of La (Phen)2Cl3DMF· (DMF)2/poylurethane acrylate were prepared by in-situ polymerization based on macromonomers of polyurethane acrylate, and the properties of the materials w...
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The transparent rare earth polymers of La (Phen)2Cl3DMF· (DMF)2/poylurethane acrylate were prepared by in-situ polymerization based on macromonomers of polyurethane acrylate, and the properties of the materials were characterized. The results show that the materials have excellent transparency, heat stability and photoluminescence. While the mass ratio of the rare earth complex is 1%, the spectral transmittance of this polymer is 91.8%, and the strongest fluorescence emission peak of the rare earth polymer appears at 367 nm when the excitation wavelength is 320 nm. This material can be applied for the fields of functional optical material.
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