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Qin Q.,Nanjing Southeast University | Sun T.,Nanjing Southeast University | Yin W.,CHINA MCC17 GROUP CO. | Xu Y.,Nanjing Southeast University
Cogent Engineering | Year: 2017

Freshly prepared manganese dioxide was employed as an adsorbent to remove methylene blue (MB) from water. It was demonstrated that the obtained MnO2 outperformed several adsorbents previously reported in the literatures for a rapid and effective removal of MB. The time required to reach adsorption equilibrium was as short as 2 min. The Langmuir isotherm fit well into the experimental data with a linear correlation coefficient (R2) of 0.997. The maximum adsorption capacity was 627.1 mg/g. The removal efficiency of MB increased along with increasing MnO2 dose, whereas decreased over pH 3.0–6.0. The adsorption mechanism was primarily attributed to electrostatic attraction. © 2017 The Author(s). This open access article is distributed under a Creative Commons Attribution (CC-BY) 4.0 license.


Xu M.,Nanjing Southeast University | Yang D.,State Power Economic Research Institute | Yin W.,China MCC17 Group Co. | Yu H.,China MCC17 Group Co. | Chen Z.,Nanjing Southeast University
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2016

In order to study the fire resistance of steel reinforced engineered cementitious composites (ECC) restrained beams, three reinforced concrete (RC) restrained beams and three steel reinforced ECC (RECC) restrained beams were tested during heating and cooling phases. The influences of restraint and heating time on deformations and internal forces of the restrained beams were discussed. Differences of temperature distribution, deformations and internal forces between RC restrained beams and RECC restrained beams were compared. The results show that the temperature at measuring points of RECC restrained beams is less than the corresponding temperature of RC restrained beams. Under the same conditions, the mid-span deflection and bending moments at the beam ends of RECC restrained beams is less than RC restrained beams'. The maximum value of the axial deformation of RECC beams is about 75% of RC beams' and the maximum value of the axial force of RECC beams is about 82% of RC beams' within 60 minutes of heating. The maximum values of the axial deformation and the axial force of RECC and RC beams are very close within 120 minutes of heating. The position of contraflexure point is changing during the experiment and it disappears during the cooling phase. © 2016, Science Press. All right reserved.


Zhao X.,Nanjing Southeast University | Evans T.M.,North Carolina State University | Tao J.,China MCC17 Group CO
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

To avoid the tremendous complication and difficulty of the digital image analysis method in the laboratory which is an important approach to study the microstructure of granular materials that plays significant role and govern the macroscale of granular soils, a new method to perform the digital image analysis of microstructure of the granular soils based on numerical simulation is proposed. A series of numerical models are developed to simulate the plane strain tests of granular soil. Based on the numerical results, two methods are proposed to simulate digital image method in the laboratory: the RENCI 3D slicer method which is a direct analogous to the laboratory method, and the geometric algorithm method which takes advantage of the numerical method and is considered to be more accurate and be able to get more information of the microstructure. Some analyses of the local void ratio distribution and the particle orientation distribution are performed as on physical laboratory experiment. The proposed numerical digital image analysis method is proved to be a valid and more efficient approach for stereological analysis of microstructure of granular soils. © 2012 SPIE.


Zhang H.,Anhui University of Technology | Xun J.,China MCC17 Group Co. | Cao X.,Anhui University of Technology
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2015

TiO2 was modified by doping Cu and Ce. The effect of Cu-Ce molar percentage of TiO2, Cu-Ce molar ratio and sintering temperature on photocatalytic performance of Cu-Ce/TiO2 were studied by orthogonal design and BP neural network, then, the preparation of Cu-Ce/TiO2 was optimized. The optimal Cu-Ce/TiO2 properties were characterized by X-ray diffraction, scanning electron microscopy, and ultraviolet-visible spectroscope. The results showed that the optimized program were Cu-Ce at the molar percentage of 2.88% in TiO2, with Cu-Ce at a molar ratio of 1:1 and sintering temperature of 570 ℃. Co-doping Cu and Ce ions can effectively avoid generating more dislocation out of doped TiO2 lattice on its crystal surface and near surface so as to suppress the lattice distortion; thus enhance the ability of the transformation from TiO2 anatase to rutile crystal, and effectively inhibit the recombination of electron hole pairs, resulting in the dielectric confinement effect. ©, 2015, Science Press. All right reserved.


Peia L.-Z.,Anhui University of Technology | Yinb L.-Z.,China MCC17 Group Co. | Wanga J.-F.,Anhui University of Technology | Chena J.,Anhui University of Technology | And 3 more authors.
Materials Research | Year: 2010

Magnesium oxide and magnesium aluminate (MgAl2O4) spinel (MAS) powders have been synthesized by a simple aqueous sol-gel process using citrate polymeric precursors derived from magnesium chloride, aluminium nitrate and citrate. The thermal decomposition of the precursors and subsequent formation of cubic MgO and MAS were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetrydifferential scanning calorimetry (TG-DSC) and Fourier transform infrared spectra (FTIR). The single phase cubic MgO powder and MAS powder form after heat treatment at 800 and 1200 °C, respectively. The particle size of the MgO and MAS powders is about 100 nm and several micrometers, respectively. Ball milling eliminates the size of MgO and MgAl2O4 spinel powders by decreasing the conglomeration of the powders.


Pei L.Z.,Anhui University of Technology | Yang L.J.,Anhui University of Technology | Yang Y.,Anhui University of Technology | Fan C.G.,Anhui University of Technology | And 3 more authors.
Materials Characterization | Year: 2010

Large-scale single crystalline calcium silicate nanowires have been synthesized via a simple and facile hydrothermal route using nanoscale SiO 2 and CaO powders as the starting materials. Xonotlite [Ca 6(Si6O17)(OH)2] nanowires were first achieved after hydrothermal treatment at 220 °C for 12 h. After being calcinated at 800 °C for 1 h, the Ca6(Si6O 17)(OH)2 nanowires are completely transformed into β-CaSiO3 nanowires. The β-CaSiO3 nanowires have a diameter of 30-150 nm and a length of tens of micrometers. The hydrothermal conditions and the size of the raw materials play important roles on the size of the nanowires. A possible growth mechanism of the nanowires is also proposed. © 2010 Elsevier Inc.


Zhang H.,Anhui University of Technology | Liu S.-C.,China MCC17 Group Co. | Hu Y.,China MCC17 Group Co. | Huang X.-J.,Anhui University of Technology | Ren W.,Henan University of Science and Technology
Chinese Rare Earths | Year: 2015

TiO2 was modified with transition metal Cu and rare earth metal Ce. The scheme was optimized by orthogonal design in a combination with BP neural network to get effective removal efficiency of formaldehyde gas. The three factors four levels orthogonal design table was established with Cu-Ce-doped loading, Cu-Ce molar ratio and sintering temperature as factors and removal efficiency of formaldehyde gas as the goal factor. The optimal modified scheme was found via predicting and selecting the BP network optimization model with three factors as inputs and removal efficiency of formaldehyde gas as output on the basis of the effective fitting function. Cu-Ce-doped loading was 2.92%, Cu-Ce molar ratio was 1: 1 and sintering temperature was 517℃, respectively. The removal efficiency of formaldehyde gas was 61.60%, so the relative error of 3.46% discrepancy compared with the model value 59.47%. ©, 2015, Editorial Office of Chinese Rare Earths. All right reserved.


Zhang H.,Anhui University of Technology | He Z.-F.,China MCC17 Group Co. | Huang X.-J.,Anhui University of Technology
Chinese Rare Earths | Year: 2014

The photocatalysis effect of Cu-Ce/TiO2 was analyzed in the environmental test chamber by orthogonal test and extreme difference analysis. Crystallite size, crystal structure and optical performance were analyzed by X-ray diffraction, scanning electron microscopy and ultraviolet UV-VIS spectroscopy. Results show that influence degrees of Cu-Ce doping load, Cu-Ce molar ratio and sintering temperature are relatively independent, that is, the influence degree of Cu-Ce doping load > that of molar ratio > that of sintering temperature. If A3 = 3 %, B3 = 1:1 and C2 = 500℃, A3B3C2 was optimal solution. Due to doping Cu, Ce, mixed crystal structures like anatase-type and rutile-type are formed in TiO2 crystal structure, which makes the adsorption ability increase and the recombination of surface photo-generated electron and photo-hole reduce. Besides, it also promotes anatase turning into rutile, restrains the enhancement of crystal particle and makes optical absorption band edge red-shifting. ©, 2014, Editorial Office of Chinese Rare Earths. All right reserved.


He X.,Anhui University | Zhu K.,Anhui University | Chen Y.,Anhui University | Chang D.,Anhui University | Liang Y.,China MCC17 Group CO.
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2016

By constructing six test-pieces of right-angle fastener, a test with torsional force and slip force was carried out. The test results show the greater fastener tightening torque produce, the greater joint initial anti-torsional rigidity. When the torsional force and slip-shear force are smaller, the joint initial anti-torsional rigidity is almost equal for different fastener tightening torque. But the increasing of torsional force and slip-shear force, the right-angle fastener is stronger to resist deformation along with a bigger fastener tightening torque. Through statistical analysis of the test data, this paper obtains the formula between initial torsional rigidity of the right-angle fastener and fastener tightening torque and between torsional torque and member corner. This paper considers the joint torsional-shear effect, and adjusts the formula to calculated the length coefficient of scaffolding vertical rod about lateral displacement or not, and compares the length coefficient of scaffolding vertical rod with only considering the joint torsional effect. It will not be good for stability on steel pipe support under torsional force and shear force at the same time. © 2016, Editorial Office of Journal of Xi'an University of Architecture & Technology. All right reserved.


Yin W.,China MCC17 Group Co. | Cui J.,Anhui University of Architecture | Xia G.,Anhui University of Architecture | Jin R.,China MCC17 Group Co. | And 2 more authors.
Applied Mechanics and Materials | Year: 2013

This paper reviews the development status of the new sandwich thermal insulation composite wall, structural features and technical level. We make brief comparison to the application and development of insulation wall in wall materials composition, wall structure forms and wall construction style. Some problems that need to be solved in the engineering practice are discussed and investigated. Based on the housing industrialization, this paper expounds the new sandwich insulation composite wall and proposes some ideas. © (2013) Trans Tech Publications, Switzerland.

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