Pharmaceutical Chemistry Department, Faculty of Pharmacy, Heliopolis University, Cairo, Egypt.
Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, Cairo, 11562, Egypt.
Environ Sci Pollut Res Int. 2018 Jul;25(19):18476-18483. doi: 10.1007/s11356-018-2060-9. Epub 2018 Apr 26.
Novel magnetite nanoparticles (NPs) modified with pectin coating were fabricated, characterized, and evaluated as potential draw solute in a forward osmosis (FO) process for water desalination applications. The prepared NPs had a spherical shape with an average diameter of 200 nm and saturation magnetization of 23.13 emu/g. Thermogravimetric analysis (TGA) and FTIR spectra elucidated the successful pectin coating on magnetite surface. The potential use of the fabricated NPs in water desalination was conducted via a newly developed lab-scale FO system. Deionized water, saline water (0.2, 0.5, and 1 g% NaCl solution), and real well water (TDS = 0.9 g%) were used as feed solutions. In all experiments, the water flux gradually decreased along with the extension of experimental time and NaCl rejection rate by the FO membrane was measured to be higher than 95%. Moreover, it was found that the pectin-coated magnetite NPs demonstrated to be able to draw clean water across the FO membrane from well water with a remarkable salt rejection of 97%. Thus, it is believed that the proposed FO system using pectin-coated magnetite NPs as draw solute can be a promising technique for desalination of well waters in an environmental-friendly and energy-saving manner.
新型果胶包覆磁铁矿纳米粒子（NPs）被制备、表征，并作为正向渗透（FO）过程中的潜在汲取剂用于海水淡化应用进行了评估。所制备的 NPs 呈球形，平均直径为 200nm，饱和磁化强度为 23.13emu/g。热重分析（TGA）和傅里叶变换红外光谱（FTIR）表明成功地在磁铁矿表面包覆了果胶。通过新开发的实验室规模 FO 系统对所制备的 NPs 在海水淡化中的潜在用途进行了研究。去离子水、盐水（0.2、0.5 和 1g%NaCl 溶液）和实际井水（TDS=0.9g%）被用作进料溶液。在所有实验中，水通量随着实验时间的延长逐渐降低，FO 膜对 NaCl 的截留率被测量为高于 95%。此外，发现果胶包覆的磁铁矿 NPs 能够从井水穿过 FO 膜抽取清洁水，并具有显著的 97%盐截留率。因此，人们相信，使用果胶包覆的磁铁矿 NPs 作为汲取剂的所提出的 FO 系统可以成为一种有前途的环保和节能的井水淡化技术。
