State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China.
Water Sci Technol. 2011;64(9):1892-7. doi: 10.2166/wst.2011.138.
Polyvinylidene fluoride (PVDF) flat ultrafiltration membranes modified by nano-sized alumina (Al₂O₃) particles were prepared by phase inversion process and their properties and anti-fouling performances were examined. The influence of three types of natural organic matters on the modified membrane fouling was also studied. Raw water was taken from two different locations, i.e., Harbin and Zhaoyuan, of Songhua River. Dissolved organic compounds in the raw water were fractionated using XAD resins into three fractions, i.e., hydrophobic fraction, transphilic fraction, and hydrophilic fraction (HPI). The three adsorbed compounds were further eluted and dissolved into distilled water respectively to prepare the feed for the fouling tests. All solutions were adjusted to a concentration of 10.6 mg C/L, which equals to the total organic carbon (TOC) of the raw water. Results show that the addition of nano-Al₂O₃ particulars did not affect the inherent traits of the PVDF membranes, however, its surface hydrophilic properties were improved significantly with the addition of nanoparticles and anti-fouling performance was enhanced as well. The HPIs in the Songhua River were the main foulant, causing more fouling to membrane than hydrophobic and transphilic matters.
聚偏二氟乙烯（PVDF）平膜通过相转化法制备，并对其进行纳米氧化铝（Al₂O₃）颗粒改性，考察了改性膜的性能和抗污染性能。研究了三种天然有机物对改性膜污染的影响。原水取自松花江的两个不同地点，哈尔滨和肇源。采用 XAD 树脂将原水中的溶解有机物分为疏水性、亲脂性和亲水性（HPI）三部分。将三种吸附的化合物进一步洗脱并溶解到蒸馏水中，分别制备污染试验的进料。所有溶液的浓度均调整为 10.6mg C/L，相当于原水的总有机碳（TOC）。结果表明，纳米 Al₂O₃颗粒的添加并未改变 PVDF 膜的固有特性，但添加纳米颗粒后，其表面亲水性显著提高，抗污染性能也得到增强。松花江中的 HPIs 是主要的污染物，比疏水性和亲脂性物质对膜造成更大的污染。
