Multiple effect of thermal treatment approach on PVDF membranes: Permeability enhancement and silver nanoparticles immobilization
Multiple effect of thermal treatment approach on PVDF membranes: Permeability enhancement and silver nanoparticles immobilization
复制标题
DOI：
10.1016/j.jece.2021.105769
复制
发表时间：
2021-08
影响因子：
7.7
通讯作者：
Diyana Kamarudin;N. Awanis Hashim;B. Ong;Yuriko Kakihana;Mitsuru Higa;H. Matsuyama
中科院分区：
文献类型：
--
作者：
Diyana Kamarudin;N. Awanis Hashim;B. Ong;Yuriko Kakihana;Mitsuru Higa;H. Matsuyama
将贵金属银纳米粒子(AgNPs)作为消毒剂浸渍到聚合物膜中是生产安全饮用水的经验性改性方法之一。然而，尽管有大量的淋溶现象报道，但AgNPs在膜制备和应用过程中的分散和固定却很少被讨论。本研究制备了一型银纳米粒子(AgNPs-1)和二型银纳米粒子(AgNPs-2)，并将其加入到聚偏氟乙烯(PVDF)超滤膜中。研究了温度分别为25℃、40℃和55℃的热处理对PVDF膜物化性能的影响。在最高温度下制备的AgNPs-1和AgNPs-2复合膜具有更好的力学性能和纯水通量。在制备过程中，PVDF/PVP/AgNPs-2膜释放的银量最少(3.81%)，而在40℃浇注的PVDF/PVP/AgNPs-1膜释放的银量最大(42.34%)。值得注意的是，在0.5bar的死端过滤过程中，所有膜中都没有发现银的浸出。含有AgNPs-1和AgNPs-2的膜对E有显著的杀菌性能。大肠杆菌，降幅分别为90.38%和80.77%。因此，在55℃下制备的含AgNPs的膜具有更好的机械性能，提高了AgNPs的渗透性和良好的固定化稳定性，这表明了热处理方法。
Impregnation of the noble metal, silver nanoparticles (AgNPs) as a disinfectant into the polymeric membrane is one of the empirical modification methods in producing safe drinking water. However, the dispersion and immobilization of AgNPs during membrane fabrication and application is least discussed despite numerous leaching phenomena reported. In this study, silver nanoparticles type 1 (AgNPs-1) and type 2 (AgNPs-2) were prepared and incorporated into polyvinylidene fluoride (PVDF) ultrafiltration membrane with the presence of thermal treatment. The effect of thermal treatment was studied at temperature 25 °C, 40 °C and 55 °C which significantly influenced the physicochemical characteristics of the PVDF membrane. Membrane incorporated with AgNPs-1 and AgNPs-2 fabricated at highest temperature portrayed improved mechanical properties and pure water flux. PVDF/PVP/AgNPs-2 membrane released the smallest amount of Ag (3.81%) while PVDF/PVP/AgNPs-1 cast at 40 °C released the largest amount of Ag (42.34%) during the phase inversion at fabrication. Notably, no Ag leaching was found in all membranes during the dead-end filtration at 0.5 bar. Membranes with AgNPs-1 and AgNPs-2 showed remarkable bactericidal performance towardsE. coliwith a percentage reduction of 90.38% and 80.77%, respectively. Thus, membranes with AgNPs fabricated at 55 °C offered better mechanical properties of the enhanced permeability and excellent stability of AgNPs immobilization which signified the thermal treatment approach.