Synthesis of polymeric phthalocyanine sulfonate photosensitizer and its photodegradation on rhodamine B in aqueous medium

Abstract

Novel phthalocyanine sulfonate (H 2 PPcS x ) was synthesized from the sulfonation of a steric polymeric phthalocyanine and investigated as a photocatalyst in a homogenous system. The molecular weight of H 2 PPcS x was characterized as 9213-11692 by MALDI-TOF MS, classified as an oligomer with a 14-18 degree of polymerization. The electronic spectrum indicated a less aggregative tendency of H 2 PPCS x than the usual monomeric phthalocyanine photocatalyst. Efficient photodegradation of butyl Rhodamine B (bu Rh B) catalyzed by H 2 PPcS x was achieved in a homogenous solution; the spectral character indicated that decomposition occurred on the benzene ring in the Rh B molecular. For a 50 mg L -1 bu Rh B solution, the percentage degradation reached 95% in 4 h using 100 mg H 2 PPcS x as a photocatalyst. A mechanism involving the participation of both singlet oxygen and radicals was established for the photodegradation.

Synthesis of end‐functionalized poly(N‐isopropyl acrylamide) with zinc porphyrin and its photocatalytic activity under visible light

“…Poly( N ‐isopropyl acrylamide) (PNIPAM) is a well‐known thermoresponsive polymer, which exhibits a coil–globule transition in aqueous solutions at a lower critical solution temperature (LCST) of 32°C . A great deal of attention has been focused on the thermoresponsive properties of various functional polymers consisting of PNIPAM for their extensive applications, such as drug‐delivery systems and photocatalytic processes .…”