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He D.,Mianyang Normal University | He D.,Sichuan University | Yin G.,Sichuan University | Dong F.,Key Laboratory for Advanced Building Materials of Sichuan Province | And 3 more authors.
Acta Geologica Sinica | Year: 2012

Tourmaline from Altai mine in Xinjiang, China was used to remove lead (II), copper (IF) from aqueous solution. The results demonstrate that tourmaline contains Na(Mg,V) 3Al 6(BO 3) 3Si 6O 18 (OH) 4, NaFe 3Al 6(BO 3) 3Si 60 18(OH) 4. The data show that tourmaline from Altai mine in Xinjiang, China can be used natural adsorbent for lead (II), copper (II). It is observed that the adsorption data fitted to the Langmuir isotherm. Furthermore, both Pb (II) and Cu (II) absorbed by tourmaline and tourmaline were characterized by X-ray diffraction, Laser Raman Spectrum, Fourier transform infrared spectroscopy, X-ray energy dispersive spectrometer, Transmission electron microscopy and Zeta potential.


He D.,Sichuan University | He D.,Mianyang Normal University | He D.,Key Laboratory for Advanced Building Materials of Sichuan Province | Yin G.,Sichuan University | And 4 more authors.
Water Science and Technology | Year: 2011

Foitite from Linshou mine in China's Hebei province was investigated as an adsorbent to remove Pb(II) and Cu(II) from aqueous solution. The results showed that foitite can readily remove heavy metal ions from aqueous solution. The data shows that the metal uptake for Pb(II) increases rapidly, accounting for 74.47% when contact time was 2 min. In contrast to Pb(II), there was a worse capability for adsorption of Cu(II). In the first 4 min, the metal uptake accounted for 34.7%. According to the analytical results obtained from X-ray diffraction, laser Raman spectrum, X-ray energy dispersive spectrometer, and Zeta potential, the removal mechanism of Pb(II) and Cu(II) by using foitite can be explained as following: firstly, the existence of an electrostatic field around foitite particles can attract heavy metal ions and consequently combine heavy metal ions with OH -; secondly, heavy metal ions in the solution are exchanged with the Fe 3+ and Al 3+ in the foitite. © IWA Publishing 2011.


Xu H.-J.,Southwest University of Science and Technology | Li Y.-X.,Southwest University of Science and Technology | Teng Y.-C.,Key Laboratory for Advanced Building Materials of Sichuan Province | Ren X.-T.,Key Laboratory for Advanced Building Materials of Sichuan Province | Jiang Y.-X.,Key Laboratory for Advanced Building Materials of Sichuan Province
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2010

The assorted minerals of zirconolite and sphene doping simulated actinide neodymium were fabricated by solid reaction, using zircon, titanium dioxide, calcium carbonate, Al2O3 as raw materials. The phase assemblage, microstructure and elemental distribution were researched by X-ray diffractometer, scanning electron microscopy with energy dispersive spectrometer. The mechanism of solidification neodymium in assorted minerals of zirconolite and sphene was probed into. The better condition synthesizing the assorted minerals of zirconolite and sphene doping neodymium is holding 30 min at 1 230 °C, and the better formula is n(Ca1-x/2-y/4Nd(x+y)/2 Zr1-y/4Alx/2 Ti2-x/2O7): n(Ca1-xNdxAlx Ti1-xSiO5)=[4/(4-y)]:1. Nd3+ can enter crystal lattices of zirconolite and sphene. Sphene can immobilize Zr4+, Al3+and Nd3+; Zr4+ and Nd3+ replace Ca2+, and Al3+ replaces Ti4+. Zirconolite can immobilize Al3+ and Nd3+; Nd3+ replaces Ca2+and Zr4+, and Al3+ and replaces Ti4+.


Wang T.-T.,Southwest University of Science and Technology | Yan Y.,Southwest University of Science and Technology | Yan Y.,Key Laboratory for Advanced Building Materials of Sichuan Province | Yan Y.,State Key Laboratory Cultivation Baze for Nonmetal Compozite and Functional Materials | And 3 more authors.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2011

The impact of OES on the setting time of cement hydration was studied, and the property of OES was studied systematically by XRD and TAM air isothermal calorimetry. The results showed that compared with the naphthalene-based superplasticizers, the reduction capacity of OES was better with the same addition(0.6%), the fluidity was increased by 22.4% after 30 minutes and almost no fluidity variation with setting time in 2 hours. The OES superplasticizers can be used as the advanced set retarding and superplasticizer admixture, as it has an apparent retarding set to the cement paste with the curve peak of hydration heat flow showing at 75 h, and it doesn't affect the later strength of the cement with the 7 d compressive strength reaching the national norm and the 28 d compressive strength reaching 127%.


Wang T.,Southwest University of Science and Technology | Yan Y.,Southwest University of Science and Technology | Yan Y.,Key Laboratory for Advanced Building Materials of Sichuan Province | Yan Y.,State Key Laboratory Cultivation Baze for Nonmetal Composite and Functional Materials | And 3 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2010

The oxidized-etherified starch (OES) was prepared by corn starch via a sequebtial process of acidolysis treatment, sodium hypochlorite oxidation and oxirane etherification. The effect of water-reducing characteristic on the cement paste and the dispersion of the OES in the paste were investigated. The modification effect was characterized by Fourier transform infrared spectrometer (FTIR), rheometer, and zeta potential measurement. The results show that the carboxyl and hydroxyethyl ethers are grafted on the molecular chain of the corn starch and the dispersion effect of the water-reducing agent is superior at the carboxyl content of 0.48% and the etherification degree (MS) of 0.5. The water-reducing effect of the OES water-reducing agent was better than that of the sulfonated naphthalene formaldehyde. The water-reducing effect of the OES is superior at the contents of 0.6%-0.8%. The zeta potential of the OES was -11.4 mV, which was greater than that of the naphthalin series water-reducing agent (-36.7 mV). The dispersion effect of the OES mainly depended on the absorption of the anion carboxylic acid group, the large molecular mass and steric of the glucose unit in the molecular chain.


Liu S.,Mianyang Normal University | He D.,Mianyang Normal University | He D.,Key Laboratory for Advanced Building Materials of Sichuan Province
Advanced Materials Research | Year: 2012

The TiO 2 microcrystal was prepared under low temperature using tetrabutyl titanate as raw material. The TiO2 catalyst was characterized by XRD, SEM, TEM, FITR, and PL. At the same time, the degradation performance of TiO 2 microcrystal on methyl orange was studied in ordinary sunlight conditions. The experiments show that TiO 2 microcrystal at 85°C with 50 mL nitric acid as a crystal control agent can be obtained. Meanwhile, the light absorption of catalyst can be extended to the visible light; the methyl orange can be degraded within 100 min under visible radiation. © (2012) Trans Tech Publications, Switzerland.


Wang T.-T.,Southwest University of Science and Technology | Yan Y.,Southwest University of Science and Technology | Yan Y.,Key Laboratory for Advanced Building Materials of Sichuan Province | Hu Z.-H.,Southwest University of Science and Technology | And 2 more authors.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2010

Oxidative etherified starch (OES) is prepared by aqua-solution method using NaClO as oxidant and etherified by solvent method using ethylene oxide as etherifying agent. Take the fluidity of the cement paste as the reference standard to research the influence of the carboxyl content and degree of etherification on the water-reducing ability, and the effect of modification is characterized by IR and GPC. It shows that the molecular weight of the oxidized and etherified soluble starch had been apparently reduced and the water-reducing ability of the water-reducing agent is performing the best when the carboxyl content is 0.48% and the degree of etherification (molar substitution) is 0.5.

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