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Preparation of electric-sensitive hydrogels and their performance in forward osmosis desalination

Authors： WU Ke-lin1, LUO Hua-yong1, Fang Qian1, RONG Hong-wei1

Units： 1. School of Civil Engineering, Guangzhou University, Guangzhou 510006, China

KeyWords： Forward osmosis; electric-sensitive hydrogels; draw agent; water flux; dewatering

ClassificationCode：TQ050

year,volume(issue):pagination： 2020,40(6):58-64

Abstract：

Electric-sensitive poly(N,N-dimethylacrylamide-co-2-acrylamido-2- methyl-l-propanesulfonic acid) (P(DMAM-co-AMPS)) hydrogels were prepared and explored as draw agents in order to reduce the energy consumption of draw agent regeneration in forward osmosis (FO). The chemical structure, morphology, swelling behavior, mechanical property, water state and electrical sensitivity of the hydrogels were characterized. The water flux and regeneration performance of the hydrogels in the FO process were explored. Results showed that the equilibrium swelling ratio of P(DMAM-co-AMPS) was observed to be 532 g/g, and the swelling behavior followed the Fickian diffusion model. The hydrogels exhibited a significant and reversible deswelling behavior under the stimuli of an external contact electric field. When 2 g/L NaCl solution was used as the feed solution, the hydrogels produced an average water flux of 1.81 L m-2 h-1 during the initial 1 h in the FO desalination process. After 24-h FO operation, a water recovery rate of 67.7% was obtained when the hydrogels were dewatered for 40 min under a voltage of 15 V, showing certain application potentiality.

Funds：

广东省自然科学基金项目(2020A1515010856); 国家自然科学基金项目(51608133); 广州大学新进“优秀青年博士”培养计划项目(YB201718); 广州大学研究生创新能力培养资助计划项目(2018GDJC-M47)

AuthorIntro：

吴科霖（1994~）,男,硕士研究生,主要研究方向为正渗透汲取剂的研发,E-mail: greend@e.gzhu.edu.cn

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