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Updated: Jul 26, 2026
Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
Published on: August 16, 2018
Fast-selective electro-driven membrane reactor in fluoride/silica crystallization for microelectronic wastewaters
Yangbo Qiu1, Lei Xia2, Long-Fei Ren3
1School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China; Department of Civil Engineering, The University of Hong Kong, Pokfulam, 999077, Hong Kong Special Administrative Region of China.
This study introduces an electro-driven membrane reactor (EMR) for high-purity sodium fluorosilicate crystallization from microelectronic wastewater. The novel EMR effectively removes pollutants and recovers valuable ionic resources and water.
Area of Science:
- Environmental Science
- Chemical Engineering
- Materials Science
Background:
- Microelectronic industry wastewater poses complex pollution challenges.
- Resource recovery is crucial for wastewater reuse in this sector.
- Simultaneous high-efficiency crystallization and purity of ionic resources remain difficult.
Purpose of the Study:
- To develop an electro-driven membrane reactor (EMR) for ex-situ crystallization of fluoride/silica from microelectronic wastewater.
- To achieve high-purity fluorosilicate recovery.
- To demonstrate selective recovery from complex wastewater matrices.
Main Methods:
- An electro-driven membrane reactor (EMR) with independent chambers and a bipolar membrane was designed.
- An internal ultrafiltration membrane facilitated ion migration and nanoparticle/organic rejection.
- Optimization of voltage, membrane type, operation mode, and flux was performed.
Main Results:
- Selective recovery of sodium fluorosilicate (Na2SiF6) with over 99.5% purity was achieved.
- A crystallization rate of 64.5% was verified under optimal conditions.
- Effective rejection of coexisting ions, nanoparticles, and organic pollutants was demonstrated.
Conclusions:
- The proposed EMR offers an innovative strategy for pollutant elimination and resource recovery from microelectronic wastewater.
- This technology enables the simultaneous recovery of ionic resources and fresh water.
- The EMR shows potential for scalable application in industrial wastewater treatment.
