纳米氢氧化镁改性PVDF超滤膜的制备与表征
发布时间：2018-09-07 18:14
【摘要】：通过相转化法制备了纳米PVDF/Mg(OH)_2共混超滤膜,研究了负载Mg(OH)_2对PVDF膜结构和性能的影响。以牛血清蛋白(BSA)为模拟污染物进行超滤试验,测试膜的纯水通量和截留率;测定膜表面和水之间的接触角,进而定量分析比较膜表面的亲水性;利用微机电子控制万能试验机测试膜的机械性能;通过扫描电镜(SEM)、原子力显微镜(AFM)、X射线衍射仪(XRD)等方法表征膜表面特征。结果表明,添加纳米Mg(OH)_2的改性膜保持了原有膜的晶型结构,证明纳米Mg(OH)_2与PVDF材料有很好的相容效果。当纳米Mg(OH)_2添加量为0.8%(质量分数)时,改性效果达到最优。此时,接触角从73.1°降至59.6°,纯水通量为333.37 L/(m~2·h),较未改性前提高了126.3%,膜的拉伸最大力为6.8 N,断裂伸长率为16.2%,较未改性膜的机械性能有明显提高,膜的抗污染性也显著提高。
[Abstract]:Nano-sized PVDF/Mg (OH) _ 2 ultrafiltration membranes were prepared by phase-inversion method. The effects of Mg (OH) _ 2 loading on the structure and properties of PVDF membranes were studied. Using bovine serum protein (BSA) as the simulated pollutant, the ultrafiltration test was carried out to measure the pure water flux and retention rate of the membrane, and the contact angle between the membrane surface and the water was measured to quantitatively analyze and compare the hydrophilicity of the membrane surface. The mechanical properties of the films were tested by a microcomputer controlled universal testing machine, and the surface characteristics of the films were characterized by scanning electron microscope (SEM), atomic force microscope (AFM) and X-ray diffraction (XRD). The results showed that the modified films with nano-scale Mg (OH) _ 2 kept the crystal structure of the original film, which proved that nano-sized Mg (OH) _ 2 and PVDF had good compatibility effect. When the content of nano Mg (OH) _ 2 is 0.8% (mass fraction), the modification effect is optimal. The contact angle was reduced from 73.1 掳to 59.6 掳, the pure water flux of 333.37 L / (mm2 h),) was increased 126.3%, the tensile strength of the membrane was 6.8N, the elongation at break was 16.2T, the mechanical properties of the membrane were improved obviously, and the anti-fouling property of the membrane was also improved significantly.
【作者单位】： 中国矿业大学环境与测绘学院;
【分类号】：TQ051.893;X703
[Abstract]:Nano-sized PVDF/Mg (OH) _ 2 ultrafiltration membranes were prepared by phase-inversion method. The effects of Mg (OH) _ 2 loading on the structure and properties of PVDF membranes were studied. Using bovine serum protein (BSA) as the simulated pollutant, the ultrafiltration test was carried out to measure the pure water flux and retention rate of the membrane, and the contact angle between the membrane surface and the water was measured to quantitatively analyze and compare the hydrophilicity of the membrane surface. The mechanical properties of the films were tested by a microcomputer controlled universal testing machine, and the surface characteristics of the films were characterized by scanning electron microscope (SEM), atomic force microscope (AFM) and X-ray diffraction (XRD). The results showed that the modified films with nano-scale Mg (OH) _ 2 kept the crystal structure of the original film, which proved that nano-sized Mg (OH) _ 2 and PVDF had good compatibility effect. When the content of nano Mg (OH) _ 2 is 0.8% (mass fraction), the modification effect is optimal. The contact angle was reduced from 73.1 掳to 59.6 掳, the pure water flux of 333.37 L / (mm2 h),) was increased 126.3%, the tensile strength of the membrane was 6.8N, the elongation at break was 16.2T, the mechanical properties of the membrane were improved obviously, and the anti-fouling property of the membrane was also improved significantly.
【作者单位】： 中国矿业大学环境与测绘学院;
【分类号】：TQ051.893;X703
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