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Microfluidic fabrication of porous polydimethylsiloxane microparticles for the treatment of toluene-contaminated water

  • Zheng Lian
  • Yong Ren
  • Jun He
  • George Z. Chen
  • Kai Seng Koh
Research Paper
  • 111 Downloads
Part of the following topical collections:
  1. 2018 International Conference of Microfluidics, Nanofluidics and Lab-on-a-Chip, Beijing, China

Abstract

In this paper, pristine and two types of porous polydimethylsiloxane (PDMS) microparticles were fabricated using oil-in-water (O/W) single emulsion template by the needle-based microfluidic multiphase system. By manipulating the flow rate of either the dispersed or continuous phase, microparticles of various sizes were obtained. The capillary number of the continuous phase for all flow conditions applied in this study was less than 0.1, suggesting that the flow regime was dripping. The coefficients of variation (CV) of sizes under different flow conditions were less than 1.5% which indicates the particles to be highly monodispersed. The surface morphology and particle size were characterized by optical microscope and scanning electron microscope. Pristine PDMS microparticles (PDMS-P) and PDMS microparticles templated from tetrachloromethane (CCl4) and white granulated sugars (PDMS-C and PDMS-S, respectively) were prepared under the same flow conditions. Subsequently, the microparticles were adopted for treatment of a synthetic wastewater that contained organic compounds such as toluene under static and dynamic states for comparison. The effects including the releasing amount, size of particles, porosity of microparticles and initial concentration of pollutants were investigated based on the toluene concentration variation, which was quantified by a gas chromatograph-headspace sampler (GC-HS). It has been found that 50 mg of porous PDMS microparticles are capable of realising over 65% of toluene removal efficiency of 200 ppm toluene aqueous solution within 2 h. The microparticles were collected and reused 30 times with unchanged treatment capacity.

Keywords

Microfluidics Monodispersed microparticles Porous structure Volatile organic pollutant Absorption 

Notes

Acknowledgements

The authors acknowledge the financial support from the International Doctoral Innovation Centre, Ningbo Bureau of Education, Ningbo Bureau of Science and Technology, and the University of Nottingham. This research was supported by Young Scientist Program from National Natural Science Foundation of China under Grant no. NSFC51506103/E0605, and Zhejiang Provincial Natural Science Foundation of China under Grant no. LQ15E090001. The research was also supported by Inspiration Grant from Faculty of Science and Engineering, University of Nottingham Ningbo China. The authors would like to thank Ms. Qiaoqi Zhu and Ms. Tianyuan Peng for assistance on the microfluidic experiments of microparticle collection and characterization, as well as Mr. Daniel Dai from Agilent Technologies (Shanghai) Co. for helpful technical discussion.

Supplementary material

10404_2018_2157_MOESM1_ESM.docx (1 mb)
Supplementary material 1 (DOCX 1036 KB)

Supplementary material 2 (MP4 10429 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.International Doctoral Innovation CentreUniversity of Nottingham Ningbo ChinaNingboChina
  2. 2.Department of Mechanical, Materials and Manufacturing EngineeringUniversity of Nottingham Ningbo ChinaNingboChina
  3. 3.Department of Chemical and Environmental EngineeringUniversity of Nottingham Ningbo ChinaNingboChina
  4. 4.Research Group for Fluids and Thermal EngineeringUniversity of Nottingham Ningbo ChinaNingboChina
  5. 5.School of Engineering and Physical SciencesHeriot-Watt University MalaysiaPutrajayaMalaysia

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