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PVA/nano-TiO2 hybrid membranes: Preparation and application for alkali recovery
Authors: YAO Lanzhong, LI Xueyun, MIAO Jibin, QIAN Jiasheng*, XIA Ru, YANG Bin
Units: School of Chemistry & Chemical Engineering, Anhui University, Anhui Province Key Laboratory of Environment-friendly Polymer Materials, Hefei 230601, China
KeyWords: 3-mercaptopropyltriethoxysilane;sulfonated nano-TiO2;hybrid membranes;alkali recovery ;diffusion dialysis
ClassificationCode:TQ028.8, O631
year,volume(issue):pagination: 2016,36(1):81-87

Abstract:
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.

Funds:
国家自然科学基金(51273001),博士点基金(2011340110003)

AuthorIntro:
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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