聚乙二醇添加剂对氢氧化镁/聚醚砜杂化膜结构和性能的影响

Effect of polyethylene glycol additive on the structure and performance of Mg(OH)_2/PES hybrid membranes

以聚醚砜(PES)为成膜聚合物,聚乙二醇-400(PEG-400)为分散剂,采用相转化法,原位生成纳米氢氧化镁[Mg(OH)_2],成功制备出具有高渗透性能且抗污染的有机-无机杂化膜.本文详细研究PEG-400对杂化膜的结构及性能的影响,通过红外光谱证实纳米Mg(OH)_2的原位生成,采用电镜表征膜的微观结构,并且对杂化膜的渗透性能、截留率、接触角、孔隙率及抗污染性能进行测试.结果表明,PEG-400不仅影响制备膜的孔道结构,且利用其分子链中的氧原子与Mg^(2+)配位,促进Mg^(2+)在高分子体系中的分散,减少纳米粒子在相转化过程中的团聚.当添加PEG-400的添加量为8 g时,改性的Mg(OH)_2/PES杂化膜的性能最佳:纯水通量达到188.39 L/(m^2·h),对BSA截留率为98%,通量恢复率为80%.

Magnesium hydroxide(Mg(OH)2)/polyethersulfone (PES) organic-inorganic hybrid membrane was prepared through phase inversion method, mentioning that Mg(OH)2 was in-suit synthesized. Using polyethylene glycol (PEG 400) as a dispersant, the Mg(OH)2/PES hybrid membrane presents high performance of permeability and anti-fouling. FTIR and SEM analysises were performed, and the permeation flux, BSA retention rate, the surface hydrophilicity, porosity, and antifouling property of the membrane were investigated. The results indicated that not only PEG 400 can affect the pore structure of the prepared membrane, but also the oxygen atoms of PEG 400 can coordinate with the Mg ^2+, which promoted the dispersion of Mg ^2+ in the polymer system, and reduced the agglomeration of the nanoparticles. Additionally, taking all the tested performance into consideration, when the dosage of PEG 400 was 8 g, the hybrid Mg(OH) 2/PES membrane had the best performance: pure water flux was 188 L/(m^2·h), rejection rate was 98%, and recovery flux ratio was 80.56%.