Efficient drop reactor processing of methylene blue degradation with silver nanowire catalysts

Dwayne Chung Kim Chung, Eric Shen Lin, Linghui Peng, Xuchuan Jiang, Jian Wern Ong, Hassan Ali Abid, Zhixiong Song, Oi Wah Liew, Tuck Wah Ng

Research output: Contribution to journalArticleResearchpeer-review


A drop-based approach to facilitate the remediation of methylene blue (MB) solution via catalytic degradation with silver nanowires on a superhydrophobic substrate with a 2 mm hole without fouling is presented here. Studies on the dynamical response of drop removal via pressure rate perturbation, showed greater elapsed times at the 7.61 μL/s air flowrate with 25 μL and 30 μL volume drops than at higher air flowrates used. These results are accounted for by the rate of air flow through the plastron, used to equilibrate the lowering of pressure in the transparent receptacle that tends to prevent drop dislodgement, being only able to operate up to a specific upper limit. A method that calculates the absorbance values based on the intensity spectrum of the nanowire solution as reference was found to reveal the time progress degradation of MB solution by spectrometry. It showed that a 25 μL drop of the MB solution could be degraded within 15 s using 0.25 mg of the silver nanowire.

Original languageEnglish
Article number125749
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Publication statusAccepted/In press - 19 Oct 2020


  • catalysis
  • drop reactor
  • methylene blue
  • silver nanowire
  • Superhydrophobic

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