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Citation: HUANG Hai-Ning, GAO Shao-Bin, LI Xin, CHEN Hong, GE Li-Kai. Microfluidic Chips for Effective Desalination of Seawater Based on Ionic Concentration Polarization[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(12): 1808-1813. doi: 10.11895/j.issn.0253-3820.160294 shu

Microfluidic Chips for Effective Desalination of Seawater Based on Ionic Concentration Polarization

1.
Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China;
2.
Pen-Tung Sah Institute of Micro-Nano Science and Technology of Xiamen University, Xiamen 361005, China

Received Date: 14 April 2016
Revised Date: 20 October 2016

Fund Project: This work was supported by the National Natural Science foundation of China (Nos. 21203159, U1505243), the project of Ocean Development Research Institute of Xiamen, Xiamen Southern Oceanographic Center (No. 14GHS016NF16), the Fujian Natural Science funding (No.2015J01064), and the guiding project of Fujian Province of China (No. 2016H0036).

Desalination of seawater is one of the potential solutions to the freshwater shortage nowadays. Large-scale infrastructures and high cost are required in present desalination technologies, which hinder the widely used desalted seawater. Developing new desalination techniques could be of substantial benefit. In this study, poly(dimethylsiloxane) based microfluidic chips were developed to desalt the salt water by ion concentration polarization (ICP). Effects of the bias voltages, the flow rates of salt water, the dimensions of the micro channels and the lengths of the nano channels filled with Nafion polymer were investigated to improve the desalination efficiency. An optimized structure was obtained where the depth-to-width ratio of the micro channel was 1:20 and the length of the nano channel was 450 μm. When a bias voltage of 25 V and a flow rate of 4 μL/min of the salt water were applied, a champion desalination efficiency of 99% was reached. The study has important guiding significance for development of energy-efficient desalination devices in the near future.
- Seawater desalination,
- Microfluidic chip,
- Ion concentration polarization
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