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Sodium alginate modified magnetic nanoparticle draw solution and its forward osmosis performance

Authors： CHI Rujing, WANG Zhichao, ZHANG Mengbo, ZHU Kaihao, CAO Dongyun, DU Chunhui

Units： School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, China

KeyWords： magnetic particles; sodium alginate; forward osmosis; draw solution

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2020,40(4):72-79

Abstract：

Fe3O4-SA magnetic nanoparticles with good dispersibility and magnetic response were prepared by emulsification blending precipitation method. The structure and performance of the magnetic nanoparticles were characterized by the infrared spectroscopy, transmission electron microscopy, hysteresis loops and thermogravimetric analysis, and at the same time the forward osmosis performance of FO using Fe3O4-SA magnetic nanoparticles as the draw solution was also investigated. The results showed that SA was coated successfully on the surface of Fe3O4 particles and the nanoparticle size is about 20nm. The osmotic pressure of 80 g/L Fe3O4-SA aqueous solution reached 1270 mOSM/L. When 8 wt% Fe3O4-SA aqueous solution was used as the draw solution for the FO process, the permeation flux could reach 2.04 L/(m2·h). Fe3O4-SA aqueous solution had low reverse solute flux, its value was 0.04 g/(m2·h) which was much lower than those of NaCl and SA when the concentrations were 80g/L. These phenomena suggested that this magnetic nanoparticle had good forward osmosis separation performance.

Funds：

国家级大学生创新创业训练计划项目（项目编号:GJ201823002）

AuthorIntro：

第一作者简介：池如镜（1998－），女，浙江温州人，在读本科生，环境工程专业，E-mail: 909547405@qq.com 通讯作者，E-mail: chunhuidu@zjgsu.edu.cn

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