Hexagonal boron nitride (h-BN) nanosheets were synthesized through a facile two-step roasting process by using boric acid and melamine as raw materials under ammonia atmosphere. The average thickness ...of the nanosheets was 16 nm. The porous h-BN nanosheets displayed enhanced performance for the removal of copper ion (Cu2+) with adsorption capacity up to 819 mg/g. In addition, the excellent performance was also observed during the process of the adsorption in mixed metal ions. The features of numerous amino connections, large specific surface area (~321 m2/g) and broad range of pore size led to the outstanding adsorption performance.
The Soil and Water Assessment Tool (SWAT) was used to simulate runoff yield in Tao River Basin on ArcView GIS platform. The main objective was to validate the performance of SWAT and the feasibility ...of this model as a simulator of runoff in a catchment. The investigation was conducted using a 6-year historical runoff record from 2001 to 2008 (2001-2004 for calibration and 2005-2008 for validation). The simulated monthly runoff matched the observed values satisfactorily, with Re was less than 20%, R2 > 0.78 and Nash-suttclife (Ens)>0.8 for both calibration and validation period at 4 hydrological stations. These indicated that the simulation of runoff was reasonable, reflecting the validity of SWAT model in Tao River Basin.
At low temperatures, the copper sulfide ore collectors ester-105 will be solidified and influence the flotation indexes. To this problem, this experiments chemically modify the ester-105, and monitor ...the synthesis of the modified ester-105 with the use of chromatography-mass spectrometry which is widely applied in chemistry. Thereby, a specific understanding of the modified ester-105 ingredients is gained. Through a copper flotation test with modified ester-105 as collector, it is found that the modified ester-105 can solve the problem that ester can not well sort copper sulfide at low temperatures. This finding is conducive to promote the use of modified ester-105.
In the computational fluid dynamics study of hydrocyclones, the inlet shape is critical for the initial value of pulp. The 250mm hydrocyclone has been modeled by using the tool of GAMBIT, simulated ...the erosion resistance of hydrocyclone with different inlet through the computational fluid dynamics (CFD), meanwhile the classification experiments of hydrocyclone with different inlets have been done, compared and analyzed the final result, the hydrocyclone with new design inlet was more suitable for the flow rule of pulp, and had a better erosion resistance, which provided a scientific basis for the research of advanced hydrocyclone.
Soil erosion in a catchment has becoming a serious environmental issue for an increasing damage to the surface ecological environment. To quantitatively simulate the sediment yield, the Soil and ...Water Assessment Tool (SWAT) was introduced in Tao River Basin. The investigation was conducted using a 8-year historical observed sediment data from 2001 to 2008. The performance evaluation shows that the simulated monthly sediment yield matched the observed data satisfactorily, with Re was less than 15%, R2 > 0.9 and Nash-suttclife (Ens)>0.8 for both calibration (2001-2004) and validation period (2005-2008) at two observed stations, indicating the validity of SWAT model for sediment yield simulation in the study area. The results of this study can be helpful for solving the soil erosion issue for water environmental protection.
Fe3O4 magnetic nanoscale water-based magnetic fluid was fabricated by co-precipitation with citric acid (CA) and polyethylene amine (PEI) as dispersant. X-ray diffraction (XRD), Fourier transform ...infrared spectroscopy (FTIR), transmission electron microscopy (TEM), scanning electron microscope (SEM) and vibrating sample magnetometer (VSM) were used to investigate the samples.The modified magenetic nanoparticles (MNPs) size of about 50nm and have a saturation magnetization about 0.25emu/g.These nanoparticles can be applied to the study of genophore.
This paper has designed a kind of new wet permanent magnetism disc type high magnetic ore separator, introduced the operational principle of magnetic separator, established the separation space ...magnetic field strength mathematical model, and used the Matlab software to carry on the numerical analysis and to fix permanent disc high magnetic separator design parameter, the permanent magnetism disc type high magnetic separator with reasonable structure was made.
