Journal
DESALINATION
Volume 473, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.desal.2019.114162
Keywords
Reverse osmosis; Thin film nanocomposite; Laponite; Ion exchange; Antibacterial
Categories
Funding
- National Natural Science Foundation of China [21878177, 21773219]
- Tai Shan Scholar Foundation [ts201511003]
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Biofouling is an inevitable issue that can increase operating cost and reduce treatment efficiency, limiting the widespread application of thin film composite (TFC) membranes. Laponite (Lap) is a synthetic silicate nanoclay with the nanodisk structure, which can be used as a suitable metal ions carrier because it is ion exchangeable and biocompatible. In this work, Ag/Lap, Cu/Lap and Zn/Lap were synthesized by ion exchange method. Subsequently, Lap and metal ion exchanged Lap (M/Lap) were incorporated in polyamide (PA) layers to develop thin film nanocomposite (TFN) membranes by interfacial polymerization. The developed TFN membranes possessed improved water flux and remained a good NaCl rejection rate. Meanwhile, the incorporation of M/Lap endowed the TFN membrane with improved fouling resistance. The TFN-M/Lap membranes showed effective bactericidal properties against both E. coli and S. aureus, particularly the TFN-Ag/Lap membrane with prominent antibacterial properties against E. coli (99.2%) and S. aureus (95.1%). Fluorescence experiment, reactive oxygen species detection and the release of metal ions were also examined. The excellent antibiofouling properties of TFN-M/Lap membranes could be interpreted by cell damage resulting from contact between bacterial and metal ions. Our work provides the potential antibacterial materials and a facile approach to develop novel antibiofouling TFN membranes.
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