Xianjie Liao
材料科学技术（英文）
The FFC Cambridge process is a direct electrodeoxidation process used to reduce metal oxides for metals or alloys in molten salts. Al-Sc compound oxides are used as a precursor which formed upon blending and sintering Al2O3, Sc2O3 and Al powders and are successfully reduced by using the FFC Cambridge process at 973 K with a constant cell voltage of −3.2 V. This method is applied to the preparation of fine Al3Sc particles, which can give another new view for aluminum industry.
关键词:
FFC
葛四杰
,
曲丹
,
封莉
,
张立秋
膜科学与技术
以水体中经常暴露的5种微量药物污染物:酰胺咪嗪(CBZ)、酮洛芬(KEP)、萘普生(NAP)、双氯芬酸(DCF)和扑热息痛(ACE)为研究对象,考察了反渗透(RO)、纳滤(NF)、膜蒸馏(MD)3种膜分离技术对5种目标药物的去除效果.试验结果表明:RO与MD两种膜分离技术对5种目标药物均能高效地去除,其中MD工艺出水中5种目标药物均未检出；RO工艺出水中,CBZ、KEP、NAP和DCF 4种药物也未检出,基本实现了完全去除,ACE的去除率略低,但也达到了96.5％；相对而言,NF工艺对5种目标药物的去除效果稍差,其对CBZ、KEP、NAP、DCF和ACE的去除率分别为60.5％±0.5％、82.3％±0.7％、84.2％±0.4％、83.5％±1％、41.1％±0.2％.
关键词:
反渗透
,
纳滤
,
膜蒸馏
,
药物
陈建
,
王朋
,
曹艳贝
,
郭秉林
,
张迪
环境化学
doi:10.7524/j.issn.0254-6108.2016.07.2015112401
本研究考察了卡马西平(CRZ)在9种不同条件(裂解温度200、300、500℃,无酸,HCI和HCI-HF)处理的生物炭上的吸附动力学,分别应用拟一级、拟二级和双室一级3种动力学模型对实验数据进行拟合.研究结果表明,双室一级动力学模型对吸附动力学提供了更精确的描述.裂解温度和酸处理对CBZ的吸附动力学有显著影响,具体表现为不同酸洗导致矿物含量发生显著变化,矿物对生物炭吸附CBZ的快室吸附单元起主要作用,生物炭内部的芳香环随生物炭的升高而更加致密,生物炭内部的芳香环结构主要贡献于慢室吸附单元.生物炭的矿物组分一方面屏蔽了有机质上的一些吸附点位,另一方面矿物自身可以有效地吸附污染物,酸洗去矿物对生物炭吸附污染物的表观影响可能取决于两个方面的平衡.
关键词:
卡马西平
,
生物炭
,
裂解温度
,
矿物
,
双室一级模型
彭夷安
,
曹小妹
,
雷春华
,
刘利民
,
李其华
,
廉世勋
中国稀土学报
研究了Ba3La(BO3)3 基质中Dy3+ 的光致发光特性; 探讨了RE3+的电荷半径比(z/r)和Ce3+, Dy3+ 含量对Dy3+ 发光强度及发光颜色的影响; 分析了Ba3La(BO3)3 中Ce3+ 对Dy3+ 发光的敏化作用; 确定了Dy3+ 的 4F9/2→6H15/2及4F9/2→6H13/2跃迁发射的浓度猝灭机制均为电偶极-电四极相互作用.
关键词:
发光学
,
Dy3+
,
Ba3La(BO3)3
,
光致发光
,
浓度猝灭
,
稀土
Journal of Luminescence
Ln(3+) (Ln = Nd, Sm, Eu, Gd, Dy, Ho, Er)-doped Y3GaO6 compounds were prepared by solid-state reaction, and their optical spectra such as absorption, photoluminescence, excitation and time-resolved spectra have been measured for Ln Nd, Sm, Dy, Ho, Er. X-ray powder diffraction shows that the lattice parameters of the compounds (Y(0.96)Ln(0.04))(3)GaO6 decrease with the decrease of the radii of trivalent Ln(3+) ions, indicating that Ln(3+) ions have substituted for y(3+) ions in the lattice. Optical spectra show that there are obvious absorptions at ultraviolet to visible region. The strong emissions in visible and infra-red region show that Y3GaO6 is a suitable host for rare-earth-doped laser crystal and phosphor materials. (C) 2004 Elsevier B.V. All rights reserved.
关键词:
crystal-field;absorption-spectra;luminescence;y3ga5o12;glasses;garnet;y2o3;ions;laf3;tb3
Journal of Alloys and Compounds
The subsolidus phase relations in the ZnO-MoO3-B2O3, ZnO-MoO3-WO3 and ZnO-WO3-B2O3 ternary systems have been investigated by the means of X-ray powder diffraction (XRD). There is no ternary compound in all the systems. There are five binary compounds and five tie lines in the ZnO-MoO3-B2O3 system. This system can be divided into six 3-phase regions. There are three binary compounds and three tie lines in the ZnO-MoO3-WO3 system. This system can be divided into four 3-phase regions. There are four binary compounds and four tie lines in the ZnO-WO3-B2O3 system. This system can be divided into five 3-phase regions. The possible component regions for ZnO single crystal flux growth were discussed. The phase diagram of Zn3B2O6-ZnWO4 pseudo-binary system has been constructed, and the result reveals this system is eutectic system. The eutectic temperature is 1007 degrees C and eutectic point component is 70 mol% Zn3B2O6. (c) 2007 Elsevier B.V. All rights reserved.
关键词:
ZnO-MoO3-B2O3;ZnO-MoO3-WO3;ZnO-WO3-B2O3;Zn3B2O6-ZnWO4;phase relation;zno single-crystals;zinc oxide;growth;moo3-wo3
XU Xiuguang WANG Changzhen TU Ganfeng Northeast University of Technology
,
Shenyang
,
China.
材料科学技术（英文）
Thermodynamic properties of 3Y_2O_3·5Al_2O_3 double compound have been determined with CaF_2 single crystal electrolyte galvanic cell at 1049 K to 1230 K.The galvanic cell used can be expressed as: Pt,O_2(g)丨Y_2O_3(s),YOF_((s))丨CaF_2丨YOF_((s)), 3Y_2O_3·5Al_2O_(3(s))丨Al_2O_(3(s))丨O_2(g),Pt, of which the cell reaction is; 3Y_2O_(3(s))+SAl_2O_(3(s))=3Y_2O_3·SAl_2O_(3(s)) The following result is obtained: A_fG°(3Y_2O_3·5Al_2O_3)=-939500+765.90T±710J/mol where,△fG°(3Y_2O_3·5Al_2O_3)is the free energy of formation of 3Y_2O_3·5Al_2O_3 from Y_2O_3 and Al_2O_3.
关键词:
rare earth
,
null
,
null
Journal of the American Ceramic Society
In situ synthesis of bulk Al(3)BC(3) was achieved via a reactive hot-pressing method using Al, B(4)C, and graphite powders at 1800 degrees C for 2 h. The reaction path for synthesizing Al(3)BC(3) was investigated. It was found that Al(3)BC(3) formed via the reaction of C, B(4)C, and Al(4)C(3) above 1180 degrees C. Dense Al(3)BC(3) was prepared with a little B(4)C and graphite remained. Microstructure observations revealed the plate-like morphology of Al(3)BC(3) grains. Moreover, the mechanical properties of Al(3)BC(3) were characterized (Vickers hardness of 11.1 GPa, bending strength of 185 MPa, fracture toughness of 2.3 MPa.m(1/2), and Young's modulus of 163 GPa). Young's modulus decreased slowly with increasing temperature, and at 1600 degrees C remained 79% of that at ambient temperature. These results show that Al(3)BC(3) is a promising lightweight high temperature structural material.
关键词:
boron-carbide;high-temperature;youngs modulus;aluminum;al8b4c7;friction;ti3alc2;ti3sic2;composites;ceramics
