Development and testing of alginate/C3N4porphyrin bead as a self-initiated Fenton photocatalyst for highly efficient atrazine removal
Fenton reaction has been widely used for efficient treatment of organic wastewater. However, its applications are limited by such key factors as pH < 3. In this study, we developed, tested, and optimized an alginate/C 3 N 4 porphyrin bead (C 3 N 4 por-SA) as a recyclable photocatalyst in a photocatalysis-self-Fenton process to overcome these limitations. Porphyrin-modified C 3 N 4 (C 3 N 4 por) was used as the H 2 O 2 donator, while Fe(III) nodes served as the Fenton reagent . The as-prepared floating alginate/C 3 N 4 por bead utilized the light source as a driving force for the catalysis. Under visible light irradiation for 6 h, the model pollutant atrazine was degraded by 70.96 % by the optimized photocatalyst (named as C 3 N 4 por-SA-Fe1Ca5), demonstrating better photocatalytic performance than alginate/C 3 N 4 beads. This improvement was attributed to the higher H 2 O 2 yield from C 3 N 4 por. The alginate/C 3 N 4 por bead showed better photocatalytic activity even after several consecutive cycles and could easily be recovered for reuse. Furthermore, Fe(III)/Ca(II) bimetallic alginate bead exhibited better photocatalytic activity and a higher content of •OH radicals than the Ca(II) monometallic alginate beads, due to the ability of Fe(III) nodes to serve as a Fenton reagent. The influences of light sources, and commonly existing matters (namely SO 4 2− , Cl − , CO 3 2− , NO 3 − , and humic acid) were investigated. Moreover, the alginate/C 3 N 4 por bead demonstrated good photocatalytic performance in a simulated natural environment without the addition of extra H 2 O 2 , with an atrazine removal percentage of up to 96.3 % after 3-h irradiation. These findings indicated the great potential of alginate/C 3 N 4 por bead in practical applications.
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