The Eu(III) separation in supported dispersion liquid membrane (SDLM),with polyvinylidene fluoride membrane (PVDF) as the support and dispersion solution containing HNO3 solution as the stripping solution and Di(2-ethylhexyl) phosphoric acid (D2EHPA) dis-solved in kerosene as the membrane solution,was studied.The effects of pH value,initial concentration of Eu(III) and different ionic strengths in the feed phase,volume ratio of membrane solution and stripping solution,concentration of HNO3 solution,concentration of carrier,different stripping agents in the dispersion phase on the separation of Eu(III) were also investigated,respectively.As a result,the optimum separation conditions of Eu(III) were obtained as the concentration of HNO3 solution was 4.00 mol/L,concentration of D2EHPA was 0.160 mol/L,and volume ratio of membrane solution to stripping solution was 30:30 in the dispersion phase,and pH value was 5.00 in the feed phase.Ionic strength had no obvious effect on the separation of Eu(III).Under the optimum conditions studied,when initial concentration of Eu(III) was 1.00×10–4 mol/L,the separation rate of Eu(III) was up to 94.2% during the separation period of 35 min.The kinetic equation was developed in terms of the law of mass diffusion and the theory of interface chemistry.The results were in good agreement with the literature data.
A novel process for fabricating high-density and high diffraction efficiency inor- ganic gratings has been proposed by combining laser interference and chemical etching. In the present work, UV photosensitive Zr-contained sol was synthesized, and photosensitive ZrO2/BzAc gel films on (100) silicon were prepared using the sol-gel method. Subsequently, inorganic film gratings with a pitch of 1 μm were fabricated by laser interference in this photosensitive gel film combining with the process of heat treatment. In order to increase the depth-to-width ratio of the grat- ings, chemical etching was adopted by using iodine-saturated KOH as anisotropic etchant, which improved the diffraction efficiency of the gratings effectively. Fur- thermore, the diffraction efficiency was improved by gold coating to enhance the surface glossiness and reflection coefficient.
WANG ZheZheZHAO GaoYangMA JieYuanPENG HaiJunLI MeiLian
The transport of Dy(Ⅲ) through a dispersion supported liquid membrane(DSLM) consisting of polyvinylidene fluoride membrane(PVDF) as the liquid membrane support and dispersion solution including HCl solution as the stripping solution and 2-ethyl hexyl phosphonic acid-mono-2-ethyl hexyl ester(PC-88A) dissolved in kerosene as the membrane solution,was studied. The effects of pH value,initial concentration of Dy(Ⅲ) and different ionic strength in the feed phase,volume ratio of membrane solution and stripping solution,concentration of HCl solution,concentration of carrier,different stripping agents in the dispersion phase on transport of Dy(Ⅲ) were also investigated,respectively. As a result,when the concentration of HCl solution was 4.0 mol/L,concentration of PC-88A was 0.10 mol/L,and volume ratio of membrane solution and stripping solution was 40:20 in the dispersion phase,and pH value was 5.0 in the feed phase,the transport effect of Dy(Ⅲ) was the best. Ionic strength had no obvious effect on transport of Dy(Ⅲ) . Under the optimum condition studied,when initial concentration of Dy(Ⅲ) was 0.8×10-4 mol/L,the transport rate of Dy(Ⅲ) was up to 96.2% during the transport time of 95 min. The kinetic equation was developed in terms of the law of mass diffusion and the theory of interface chemistry. The diffusion coefficient of Dy(Ⅲ) in the membrane and the thickness of diffusion layer between feed phase and membrane phase were obtained and the values were 1.99×10-7 m2/s and 15.97 μm,respectively. The results were in good agreement with experimental results.
The transport of Tb(III) in dispersion supported liquid membrane(DSLM) with polyvinylidene fluoride membrane(PVDF) as the support and dispersion solution including HCl solution as the stripping solution and di(2-ethylhexyl) phosphoric acid(D2EHPA) dissolved in kerosene as the membrane solution, has been studied. The effects of pH value, initial concentration of Tb(III) and different ionic strength in the feed phase, volume ratio of membrane solution to stripping solution, concentration of HCl solution, concentration of carrier, different stripping agents in the dispersion phase on the transport of Tb(III) have also been investigated, respectively. As a result, the optimum transport conditions of Tb(III) were obtained, i.e., the concentration of HCl solution was 4.0 mol/L, the concentration of D2EHPA was 0.16 mol/L, the volume ratio of membrane solution to stripping solution was 30:30 in the dispersion phase and pH value was 4.5 in the feed phase. Ionic strength had no obvious effect on the transport of Tb(III). Under the optimum conditions, the transport percentage of Tb(III) was up to 96.1% in a transport time of 35 min when the initial concentration of Tb(III) was 1.0×10–4 mol/L. The diffusion coefficient of Tb(III) in the mem-brane and the thickness of diffusion layer between feed phase and membrane phase were obtained and the values were 1.82×10–8 m2/s and 5.61 μm, respectively. The calculated results were in good agreement with the literature data.
