Improved Photodegradation Efficiency of 2,4-DCP Through a Combined Q3Fe(III)-Decorated Porous g-C3N4/H2O2 System

Graphitic carbon nitride (g-C 3 N 4 ) is a photocatalyst with wide application in removal of organic pollutants. In this study, we designed a porous g-C 3 N 4 (p-g-C 3 N 4 )/8-quinolinolato iron(III) (Q 3 Fe)/H 2 O 2 system to enhance the organic pollutant removal efficiency by combining photocatalysis and Fenton interaction under neutral condition. The p-g-C 3 N 4 was prepared through a two-step thermal oxidation reaction. Afterwards, Q 3 Fe-coupled p-g-C 3 N 4 was prepared by an impregnating method. The 2,4-dichlorophenol (2,4-DCP) photodegradation ratio and decomposition rate of the p-g-C 3 N 4 /Q 3 Fe/H 2 O 2 system are approximately 5 and 18 times as high as those of individual p-g-C 3 N 4 system, respectively. Besides, its degradation rate is 4.3 times as high as that in the p-g-C 3 N 4 /H 2 O 2 system. Meanwhile, Q 3 Fe/g-C 3 N 4 also exhibits higher activity than individual p-g-C 3 N 4 in 2,4-DCP photo-decomposing. On the basis of the results of the radical trapping experiments and the Fe(II) concentration in different systems, the synergistic effect between photocatalysis and Fenton reaction is vital for the efficient pollutant degradation. The coupled system combining p-g-C 3 N 4 with Q 3 Fe and H 2 O 2 shows potential for efficient treatment of recalcitrant organic pollutants. The combined system in this work indicated a new idea for the decomposition of organic pollutants.