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Wastewater Treatment Using High-Performance In Situ Formed Double-Heterojunction Janus Photocatalyst Microparticles

Hassanin M Ali1,2, Farzaneh Arabpour Roghabadi1, Vahid Ahmadi3

  • 1Department of Process Engineering, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran 14115-114, Iran.

Langmuir : the ACS Journal of Surfaces and Colloids
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This study developed novel Janus photocatalysts on polydimethylsiloxane (PDMS) microparticles for efficient wastewater treatment. The Ag/TiO2@PDMS system effectively degrades organic dyes and pharmaceuticals with high stability.

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nanotechnology

Background:

  • Wastewater contamination by organic dyes and pharmaceuticals poses environmental risks.
  • Developing efficient and stable photocatalysts is crucial for water remediation.
  • Heterojunction photocatalysts offer enhanced performance for pollutant degradation.

Purpose of the Study:

  • To fabricate a novel heterogeneous photocatalysis system for wastewater treatment.
  • To synthesize double-heterojunction Janus photocatalysts on polydimethylsiloxane (PDMS) microparticles.
  • To evaluate the efficiency and stability of the Ag/TiO2@PDMS system for degrading rhodamine B and tetracycline.

Main Methods:

  • Fabrication of size-tunable PDMS microparticles using coflow microfluidic devices.
  • Synthesis of Ag/TiO2 Janus-like photocatalysts on porous PDMS via polymer chain etching and silver source treatment.
  • In situ creation of Ag/TiO2-TiO2 metal-semiconductor heterojunctions.
  • Testing photocatalytic degradation of rhodamine B (RhB) and tetracycline (TC) under visible light.

Main Results:

  • Achieved high decomposition efficiencies: 94.4% for RhB and 91.1% for TC.
  • Optimized conditions included pH 11, visible light, 60 min, and specific catalyst/reagent concentrations.
  • Demonstrated excellent stability with no significant performance loss after five cycles.

Conclusions:

  • The developed Ag/TiO2@PDMS photocatalyst system is highly effective for degrading organic pollutants in wastewater.
  • The Janus-like double-heterojunction structure enhances photocatalytic activity.
  • The system shows promising potential for practical environmental applications due to its efficiency and stability.