Membrane Biofouling Control by Surface Modification of Quaternary Ammonium Compound Using Atom-Transfer Radical-Polymerization Method with Silica Nanoparticle as Interlayer.
Membrane Biofouling Control by Surface Modification of Quaternary Ammonium Compound Using Atom-Transfer Radical-Polymerization Method with Silica Nanoparticle as Interlayer.
复制标题
以二氧化硅纳米颗粒为中间层的原子转移自由基聚合法对季铵化合物进行表面改性控制膜生物污染
DOI：
10.3390/membranes10120417
复制
发表时间：
2020-12-11
期刊：
影响因子：
4.2
通讯作者：
Zhang X
中科院分区：
文献类型：
--
作者：
Ren L;Ping M;Zhang X
通过电子转移原子转移自由基聚合法(ARGET ATRP)再生表面活化剂，将季铵化合物(QAC)接枝到聚偏氟乙烯(PVDF)膜上，制备了一种简便的抗生物污染膜。在改性过程中，通过硅化反应将亲水性二氧化硅纳米层固定在膜表面作为中间层进行QAC接枝，使膜具有良好的表面性能(如亲水表面和带负电荷的表面)。QAC改性膜(MQ)的亲水性和渗透性显著提高，这主要是由于二氧化硅纳米颗粒的引入和亲水性季铵盐基的暴露而不是长的烷基所致。此外，QAC在膜表面的覆盖使MQ膜具有明显的抗菌效果，对革兰氏阴性杆菌和金黄色葡萄球菌的抑菌率分别为99.9%和99.9%。间歇过滤试验表明，与对照膜相比，MQ膜具有更好的抗生物污染性能，这归因于膜的亲水性和抗菌活性的提高。此外，经过反复的污染清洗试验，MQ膜也表现出令人印象深刻的QAC稳定性。这些改性方案为制备用于废水处理的高性能抗生物污染QAC基膜提供了一种新的稳健的方法。
A facile approach to fabricate antibiofouling membrane was developed by grafting quaternary ammonium compounds (QACs) onto polyvinylidene fluoride (PVDF) membrane via surface-initiated activators regenerated by electron transfer atom-transfer radical-polymerization (ARGET ATRP) method. During the modification process, a hydrophilic silica nanoparticle layer was also immobilized onto the membrane surface as an interlayer through silicification reaction for QAC grafting, which imparted the membrane with favorable surface properties (e.g., hydrophilic and negatively charged surface). The QAC-modified membrane (MQ) showed significantly improved hydrophilicity and permeability mainly due to the introduction of silica nanoparticles and exposure of hydrophilic quaternary ammonium groups instead of long alkyl chains. Furthermore, the coverage of QAC onto membrane surface enabled MQ membrane to have clear antibacterial effect, with an inhibition rate ~99.9% of Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive), respectively. According to the batch filtration test, MQ had better antibiofouling performance compared to the control membrane, which was ascribed to enhanced hydrophilicity and antibacterial activity. Furthermore, the MQ membrane also exhibited impressive stability of QAC upon suffering repeated fouling–cleaning tests. The modification protocols provide a new robust way to fabricate high-performance antibiofouling QAC-based membranes for wastewater treatment.