通讯机构：
[Wang, WL; Wang, YL] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.
关键词：
Cr(6+) and carmine;Electron beam irradiation;Heterostructure;In(2)S(3)-CdIn(2)S(4)@X(X = Ag, Ag(3)PO(4), AgI);Photocatalysis
摘要：
Ternary heterostructure nanotubes of In2S3-CdIn2S4@X(X=Ag, Ag3PO4, AgI) were synthesized with enhanced photocatalytic activity for efficiently degrading pollutants. Electron beam irradiation was employed to artificially introduce interface defects to the heterostructure nanotubes. The experimental results for degrading carmine and Cr(6+) under visible light irradiation showed that the photocatalytic efficiency of In2S3-CdIn2S4 was improved to some extent by the introduction of silver compounds. DRS results confirmed that the band gaps of In2S3-CdIn2S4 were reduced to 1.62eV and 1.58eV by introducing Ag3PO4 and AgI, respectively. Interestingly, the band gap of In2S3-CdIn2S4@AgI after electron beam irradiation was further reduced to 1.56eV, resulting in that the degradation time of both Cr(6+) and carmine by In2S3-CdIn2S4@AgI after high-energy electron beam irradiation was shortened to only 5min. The XRD spectra of the photocatalysts after five cycles could maintain the original crystal form to a large extent. The OH stretching vibration peaks of In2S3-CdIn2S4@AgI after electron beam irradiation at 3387cm(-1) became wider and sharper, thus indicating that the number of free hydroxyl groups on the heterostructure surface significantly increased. PL results showed that electron beam irradiation could significantly reduce the PL emission peak and enhance the utilization of photogenerated charge carriers. EIS results further confirmed that In2S3-CdIn2S4@AgI processed by electron beam irradiation had higher photogenerated electron-hole separation efficiency. Based on the experimental results, a feasible reaction pathway and photocatalytic mechanism for the degradation of carmine was investigated. ESR results showed that the main active groups in the whole photocatalytic system were *O2(-) and h(+).
摘要：
In order to verify the properties of Konjac-kappa-Carrageenan mixed gel, some effects were studied in this paper, including kappa-Carrageenan-Konjac on their mixtures viscosity, temperature, heating time, concentration, storage temperature and time, KCl, CaCl2 and NaCl concentration in storage condition. The results showed that great synergism interaction existed among kappa-Carrageenan and Konjac gum (such as viscosity and strength) for the action of molecular power. Moreover, the suitable conditions of gelation formation were mixed gel concentration 1.0%, 80 degrees C water for 30 minutes, and then at room temperature for 6h, storage temperature (refrigeration, -5 similar to 18 degrees C), KCl concentration 0.1%, CaCl2 concentration 0.1%similar to 0.4% and NaCl concentration 0.6%similar to 0.8%. These results could be theoretical reference for mixed gel application in food industry.
摘要：
The reaction of AgNO3, 4,4'-bipyridine (bpy)/flexible 1,2-di(4-pyridyl)ethylene (dpe), diphenic acid (H(2)da) in acetic acid/alcohol aqueous solution produces, respectively, block-like crystals of [Ag-2(bpy)(2)(Hda)(2)](HAc)(2) center dot 2H(2)O (1), and [Ag-2(dpe)(2)(da)]center dot 4H(2)O (2) at room temperature. Both the above-stated compounds consist of parallel 1D infinite cationic chains, [AgL](infinity) (L=bpy and dpe), interspersed with organic da(2-) anions which play the role of charge compensation in the crystal structure. The lattice water molecules are situated among these chains, and stabilized by rich hydrogen-bonding interactions, playing a role in the orientation of the da2- in the crystal packing. Optical absorption properties and band gaps of title compounds were determined with UV/Vis/NIR diffuse reflectance spectra, and the results show that the E-g can be assessed at 3.3 eV for both compound 1 and 2. CCDC: 768737, 1; 768736, 2.
摘要：
Rheological properties of low-concentration Konjac gum and impacts of concentration, shearing rate, pH value and stirring time on its viscosity were studied. The results show that the viscosity of low-concentration Konjac gum increases with the increase of its concentration. The solution presents pseudo-plasticity fluid, which shows the characters of shear thinning as follows: first, its viscosity decreases gradually as the temperature increases, and then increases with the increase of temperature. The viscosity decreases sharply at both acid and alkaline conditions, indicating that it is influenced apparently by pH value. And the viscosity of low-concentration Konjac gum is also impacted by the stirring time.
