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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


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
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