Electrospining Machine: Prof. Jiahui Shao, Shanghai Jiao Tong University: Easy Preparation of COF Modified Membrane for Pollutant Treatment by Electrostatic Spraying

Background

Emerging contaminants (ECs) in water ecosystems have become a global threat to mankind, and these contaminants are mainly from industrial wastewater. Direct contact membrane distillation (DCMD) can utilize residual heat to treat industrial wastewater containing ECs, balancing removal efficiency and operating cost better than other technologies. The preparation of COF-LZU1 modified membranes and their application in direct contact membrane distillation (DCMD) for the treatment of emerging contaminants, as well as the effect of temperature variations on membrane performance, are mainly discussed. However, membrane contamination is a major obstacle to the application of DCMD.

In view of this, Prof. Jiahui Shao's team at Shanghai Jiaotong University prepared COF-LZU1 modified membrane by electrospinning machine and used it for DCMD, and the related research results are summarized as “Facile preparation of COF-LZU1 modified membrane via electrostatic spraying for emerging pollutants”. The related research results were published in the journal “Separation and Purification Technology” under the title of “Facile preparation of COF-LZU1 modified membrane via electrostatic spraying for emerging contaminants treatment in direct contact membrane distillation”. Purification Technology.

The main point of this paper

1.For the first time, anti-fouling covalent organic skeleton COF-LZU1/PVDF composite membrane was prepared by electrospinning machine and used for DCMD.

2.When treating sulfamethoxazole and ibuprofen in the range of pH 4 ~ 7 and temperature 40 ~ 70 °C, the COF-1.0 membrane with a relatively hydrophilic structure showed higher permeate flux and salt drainage performance than the commercial PVDF substrate.

3.A comparison of the membrane performances by the variable-temperature DCMD process further demonstrated that the COF-1.0 showed a better performance in terms of the permeate flux, especially in the gradually decreasing temperature The membrane performance of COF-1.0 was further shown to be better in terms of permeate flux, especially in the case of decreasing temperature.

COF-1.0 membranes offer the following advantages over commercial PVDF substrates

1. The COF-1.0 membrane showed less reduction in permeate flux and exhibited better fouling resistance when treating sulfamethoxazole and ibuprofen.

2. COF-1.0 membranes exhibited higher permeate flux and flux recovery during temperature changes, reducing the deposition of ECs on the membrane surface.

3. The performance of COF-1.0 membranes showed better treatment at different temperatures and demonstrated greater fouling resistance.

These advantages indicate that COF-1.0 membrane has better performance in DCMD process, especially in the treatment of ECs and utilization of waste heat with potential applications.

Originallink: https://doi.org/10.1016/j.seppur.2024.126411