木质素磺酸钠改性聚砜膜的制备及其在正渗透膜中的应用

发布时间：2018-03-18 15:16

本文选题：木质素　切入点：聚砜　出处：《高分子学报》2017年05期 　论文类型：期刊论文

【摘要】：采用木质素磺酸钠作为亲水添加剂,通过浸没沉淀相转化法制备了木质素磺酸钠共混改性聚砜膜,以改善聚砜膜的亲水性,并用作正渗透膜的支撑层,以降低内浓差极化效应.利用扫描电子显微镜、衰减全反射傅里叶变换红外光谱仪、水接触角仪等研究了不同木质素磺酸钠添加量对聚砜膜的结构和表面性质的影响.结果表明,添加木质素磺酸钠后,聚砜膜的指状孔变得规整且狭长.水接触角实验证实添加木质素磺酸钠能改善聚砜膜的亲水性,当木质素磺酸钠含量为0.4 wt%时,聚砜膜的表面水接触角可降低至65°.正/反渗透测试装置分别用于表征正渗透膜的传质性质和结构参数.结果表明,以0.4 wt%木质素磺酸钠改性聚砜膜为支撑层的正渗透膜的水渗透性能(A=3.12×10~(-5) LMH×Pa~(-1))优于纯聚砜基底正渗透膜(0.76×10~(-5)LMH×Pa~(-1)),而且前者的结构参数(S=2010mm)远小于后者(3450mm),说明木质素磺酸钠改性聚砜膜有效弱化了正渗透膜的内浓差极化效应.
[Abstract]:Sodium lignosulfonate was used as hydrophilic additive. Sodium lignosulfonate blend modified polysulfone membrane was prepared by immersion precipitation phase inversion method in order to improve the hydrophilicity of polysulfone membrane and be used as the support layer of the membrane. In order to reduce the polarization effect of internal concentration difference, using scanning electron microscope, attenuating total reflection Fourier transform infrared spectrometer, The effects of different amount of sodium lignosulfonate on the structure and surface properties of polysulfone membrane were studied by water contact angle analyzer. The finger pore of polysulfone membrane became regular and narrow. The water contact angle experiment showed that the addition of sodium lignosulfonate could improve the hydrophilicity of polysulfone membrane, when the content of sodium lignosulfonate was 0.4 wt%, The surface water contact angle of polysulfone membrane can be reduced to 65 掳. The positive / reverse osmosis test device is used to characterize the mass transfer properties and structural parameters of the membrane respectively. The water permeability of the membrane with 0.4 wtwt% sodium lignosulfonate modified polysulfone membrane is better than that of pure polysulfone substrate membrane (0.76 脳 10 ~ (-5) H _ (OH) 脳 Pao ~ (-1)), and the structure parameter of the former is much smaller than that of the latter's (3450 mm ~ (-1)), which shows that the modified polysulfonic acid membrane is better than that of the pure polysulfone substrate (0.76 脳 10 ~ (10) ~ (-5)), and the structure parameter of the former is much smaller than that of the latter (3.45 mm ~ (-1)), indicating that the structure of the former is much smaller than that of the latter. Sulfone membrane effectively weakens the polarization effect of internal concentration difference of osmotic membrane.
【作者单位】：宁波大学材料科学与化学工程学院;中国科学院宁波材料技术与工程研究所中国科学院海洋新材料与应用技术重点实验室;
【基金】：国家自然科学基金(基金号51403107,21404112) 宁波市自然科学基金(基金号2015A610014) 中国科学院海洋新材料与应用技术重点实验室开放课题(项目号2016K07) 宁波大学王宽诚幸福基金资助
【分类号】：TQ051.893

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