Journal of Membrane Science ( IF 9.5 ) Pub Date : 2021-02-19 , DOI: 10.1016/j.memsci.2021.119193 L.H.T. Lyly , Y.S. Chang , W.M. Ng , J.K. Lim , C.J.C. Derek , B.S. Ooi
This study evaluates the performance and cleaning efficiency of direct contact membrane distillation (DCMD) by changing its surface energy via thermal actuation. Thermoresponsive SiO2-PNIPAM particles were dosed into the DCMD with different surface energy and its thermal cleaning efficiency was evaluated against the model organic foulants namely Bovine Serum Albumin (BSA) and Sodium Alginate (SA). The impact of SiO2-PNIPAM dosing on the performance of membrane distillation as well as its defouling efficiency were evaluated under thermal actuation effect. Results showed that composite membrane has higher flux recovery (93%–95%) compared to pristine membrane (55%–90%). The thermoresponsive membranes were analysed for their surface free energy (SFE) to understand their fouling and cleaning behaviour. Based on SFE analysis, it was found that both low and high SFE thermoresponsive membranes surface that fouled by BSA and SA foulants were able to restore their hydrophobicity after thermal actuation. The stability of the embedded hydrogel could be maintained after thermal actuation which indicated sufficient interactions between the hydrogel with the PVDF membrane matrix.
中文翻译:
通过表面能驱动将具有热清洗性能的SiO 2 -PNIPAM定量加入膜蒸馏
这项研究通过通过热驱动改变其表面能来评估直接接触膜蒸馏(DCMD)的性能和清洁效率。将具有热敏性的SiO 2 -PNIPAM颗粒以不同的表面能加入到DCMD中,并针对模型有机污垢物即牛血清白蛋白(BSA)和海藻酸钠(SA)评估其热清洁效率。SiO 2的影响在热激励作用下评价了-PNIPAM对膜蒸馏性能的定量及其除污效率。结果表明,与原始膜(55%–90%)相比,复合膜具有更高的通量回收率(93%–95%)。分析热敏膜的表面自由能(SFE),以了解其结垢和清洁行为。基于SFE分析,发现被BSA和SA污垢污染的低SFE和高SFE热敏膜表面都能在热驱动后恢复其疏水性。在热致动之后可以保持嵌入的水凝胶的稳定性,这表明水凝胶与PVDF膜基质之间有足够的相互作用。