Defective analcime/geopolymer composite membrane derived from fly ash for ultrafast and highly efficient filtration of organic pollutants

Ningning Shao; Siqi Tang; Shun Li; Hong Chen; Zuotai Zhang

doi:10.1016/j.jhazmat.2019.121736

Defective analcime/geopolymer composite membrane derived from fly ash for ultrafast and highly efficient filtration of organic pollutants

J Hazard Mater. 2020 Apr 15:388:121736. doi: 10.1016/j.jhazmat.2019.121736. Epub 2019 Nov 21.

Authors

Ningning Shao¹, Siqi Tang², Shun Li², Hong Chen³, Zuotai Zhang⁴

Affiliations

¹ School of Environmental Science and Engineering, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, PR China; Institute of Technology for Marine Civil Engineering, Shenzhen Institute of Information Technology, Shenzhen, 518172, PR China.
² School of Environmental Science and Engineering, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, PR China.
³ School of Environmental Science and Engineering, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, PR China; Key Laboratory of Municipal Solid Waste Recycling Technology and Management of Shenzhen City, Shenzhen, 518055, PR China.
⁴ School of Environmental Science and Engineering, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, PR China; Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, Shenzhen, 518055, PR China; Key Laboratory of Municipal Solid Waste Recycling Technology and Management of Shenzhen City, Shenzhen, 518055, PR China. Electronic address: zhangzt@sustc.edu.cn.

PMID: 31787401
DOI: 10.1016/j.jhazmat.2019.121736

Abstract

Nanofiltration membranes (NFMs) are of great interest for water purification attributed by their excellent performance, while the high fabrication cost greatly limits their use. Herein, an ultra-low-cost zeolite-based NFM was developed by a simple hydrothermal method using fly ash as the raw material and used for the high-efficiency filtration of organic pollutants from wastewater. The as-obtained zeolite membrane was composed of crystalline analcime (ANA) type zeolite and amorphous geopolymer (GP) composite. Benefiting from the defects introduced large cavities and microporous channels in ANA, the ANA/GP composite membrane with a thickness of ∼60 μm exhibited permeation rates as high as 340-440 L/(m²·h·MPa), and the rejection rates are up to 97 % towards methylene blue. Moreover, the fabrication cost of the ANA/GP membrane is only $31.8/m², far lower than the reported efficient NFMs. The development of the ANA/GP-NFM paves the way for developing commercially applicable membranes for organics separation and water purification.

Keywords: Fly ash; Membrane; Nanofiltration; Water purification; Zeolite.

Publication types

Research Support, Non-U.S. Gov't