膜科学与技术

PVA/nano-TiO2杂化膜的制备与碱回收性能研究

作者：姚兰忠，李雪云，苗继斌，钱家盛，夏茹，杨斌

单位：安徽大学化学化工学院安徽省绿色高分子材料重点实验室，合肥 230601

关键词： γ-MPTS；纳米二氧化钛；杂化膜；碱回收；扩散渗析

出版年,卷(期):页码： 2016,36(1):81-87

摘要：

利用γ-巯丙基三乙基硅烷（γ-MPTS）对纳米氧化钛颗粒 (p-TiO2)进行了表面修饰引入巯基（-SH），采用双氧水氧化的方法制备了表面带有-SO3H的纳米氧化钛颗粒（s-TiO2）。利用溶液共混的方式将s- TiO2和预交联的PVA溶液混合后涂覆成膜，制备了一系列PVA/nano-TiO2有机-无机杂化膜。对杂化膜的结构测试结果表明其具有良好的机械稳定性，热稳定性和耐碱性：拉伸强度为37.0-53.4 MPa，断裂伸长率为43.2%-146.0%；65℃碱液中的溶胀度为205.4%-220.2%，质量损失为10.0%-15.9%。制备的杂化膜含水量（WR）为90.9%-105.6%，离子交换容量（IEC）为0-0.025 mmol/g。利用NaOH/Na2WO4体系模拟扩散渗析回收NaOH的结果表明：25℃时OH-渗析系数为0.013-0.015 m/h，分离系数为21.8-30.1。

In this research, surface of pure titanium dioxide nanoparticles (p-TiO2)was modified with 3-mercaptopropyltriethoxysilane (γ-MPTS) to introduce -SH firstly and then hydrogen peroxide (H2O2) was used as a green oxidizing agent to introduce -SO3H. After that a series of PVA/nano-TiO2 hybrid membranes were prepared by blending s-TiO2 and pre-crosslinked polyvinyl alcohol (PVA) solution directly. The as-prepared membrane were thermally and mechanically stable, with tensile strength of 37.0-53.4MPa and elongation at break of 43.2%-146.0%. Swelling degree of 205.4%-220.2% and weight loss of 10.0%-15.9% in 65℃ 2 mol/L NaOH solution. The membrane possessed water uptake (WR) of 90.9%-105.6% and ion exchange capacity (IEC) of 0-0.025 mmol/g, respectively. The membranes were used for alkali recovery via the system of NaOH/Na2WO4 based on diffusion dialysis successfully and results showed that dialysis coefficients of OH- (UOH) were in the range of 0.013-0.015 m/h, separation factors (S) were in an acceptable range of 21.8-30.1.

第一作者：姚兰忠（1987-），男，安徽宿州人，硕士研究生，从事有机-无机杂化膜研究，*通讯作者，E-mail：qianjsh@ahu.edu.cn

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