Microwave-assisted optimization of platinum-nickel nanoalloys for catalytic water treatment

Hanyu Ma, Haitao Wang, Chongzheng Na

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

Blending noble metal catalysts with inexpensive transition metals can reduce material cost in catalytic water treatment by improving the catalytic reactivity. An important challenge is, however, to synthesize a series of alloy nanoparticles with varied compositions so that the screening of catalytic reactivity can be performed rapidly for a contaminant of interest. Here, we report a facile approach for the rapid synthesis of bimetallic nanoalloys using cycle-controlled microwave-assisted polyol reduction, with an option of fixing the nanoalloys directly on graphene supports in a one-pot operation. Using Pt and Ni as the model noble and promoter metals, we show that Pt/Ni nanoparticles with diameters ranging from 2.8 to 4. nm can be readily synthesized within minutes. The surface Ni percentage of the nanoparticles are varied from 0 to 100%, which serves as a model system for nanoalloy screening. Using the model contaminant p-nitrophenol, we further show that the reactivity-composition relationship has a classic volcano shape as the Sabatier principle predicts. The highest reactivity is found with a surface Ni percentage of approximately 50%.

Original languageEnglish
Pages (from-to)198-204
Number of pages7
JournalApplied Catalysis B: Environmental
Volume163
DOIs
StatePublished - Feb 2015

Keywords

  • Bimetallic alloy
  • Industrial wastewater treatment
  • Nano catalyst
  • Nitroaromatic reduction
  • Noble metal catalyst

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