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

By Paolo Dambruoso, Marco Ballestri, Claudia Ferroni, Andrea Guerrini, Giovanna Sotgiu, Greta Varchia and Alessandro Massi

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 result- ing nano-supported catalyst. The NP coagulation procedure relied on various electrocoagulation tech- niques 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 photo- excitation of triplet oxygen to singlet oxygen for the selective and environmentally benign sulfoxidation of a model sulfide in an aqueous medium

Year: 2015
DOI identifier: 10.1039/c4gc01996b
OAI identifier: oai:iris.unife.it:11392/2327825
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