TPPS supported on core-shell PMMA nanoparticles: The development of continuous-flow membrane-mediated electrocoagulation as a photocatalyst processing method in aqueous media

Paolo Dambruoso, Marco Ballestri, Claudia Ferroni, Andrea Guerrini, Giovanna Sotgiu, Greta Varchi, Alessandro Massi

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Herein, the successful utilization of core shell poly-methyl methacrylate nanoparticles (CS-PMMA NPs) as a valuable support for organocatalyst immobilization in aqueous medium is presented along with an unprecedented direct current-based electrochemical method for processing a water colloid of the resulting nano-supported catalyst. The NP coagulation procedure relied on various electrocoagulation techniques and it was achieved through water electrolysis occurring in a dialysis membrane immersed in the colloid. Mass recoveries of up to 95% w/w were obtained for the NPs within 1 h of electrolysis. This was optimized at a constant current of 90 mA or a constant potential of 24 V. The disclosed NP separation procedure was effectively exploited in a continuous-flow reaction/separation/recycle sequence involving the tetraphenylporphyrin tetrasulfonate (TPPS) organo-photocatalyst immobilized on CS-PMMA NPs (NP2s). After an optimization study aimed at maximizing the chemical efficiency of the entire synthetic and purification process, the nano-supported catalyst NP2 (0.05 mol%) efficiently promoted the photoexcitation of triplet oxygen to singlet oxygen for the selective and environmentally benign sulfoxidation of a model sulfide in an aqueous medium.

Original languageEnglish (US)
Pages (from-to)1907-1917
Number of pages11
JournalGreen Chemistry
Volume17
Issue number3
DOIs
StatePublished - Mar 1 2015

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution

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