Study on Catalytic Performance of rGH/Fe‐g‐C₃N₄ Photocatalysis‐Fenton Synergy System[1]

Abstract

Graphene and Fe‐g‐C3N4 were combined to form a three‐dimensional catalytic gel material with visible light response. The graphene gel enabled the rapid recovery of the catalyst and improved cycling performance. In this work, the co‐degradation efficiency of the rGH/Fe‐g‐C3N4 photocatalytic‐Fenton system was investigated using phenol to simulate organic pollutants. A phenol concentration of 20±0.1 mg L−1 could be completely degraded by the 10% rGH/Fe‐g‐C3N4 after 50 min, and the photocurrent was 5.1 times and 1.8 times larger than that of g‐C3N4 and Fe‐g‐C3N4, respectively. In this system, the reaction of photogenerated electrons with Fe3+ promotes the rapid transfer of photogenerated charges. Additionally, Fe2+ participates in the Fenton reaction to rapidly form ⋅OH to promote cycling of the Fe valence state. Moreover, the π‐π conjugated graphene accelerates the transfer of electrons and results in the direct reduction of H2O2 to form ⋅OH. Furthermore, compared with the powder Fe‐g‐C3N4 catalyst, 10% rGH/Fe‐g‐C3N4 showed excellent recoverability and cyclability. After seven cycles, the degradation efficiency reached >86±1%. Finally, a degradation experiment with coking wastewater was carried out under optimized conditions. After 60 min, the COD and TOC values decreased from 67.8±1 mg L−1 and 21.6±0.2 mg L−1, to 21.6±1 mg L−1 and 6.7±0.2 mg L−1, respectively.

Visible‐light‐driven photocatalytic degradation of antibiotics by newly molding g‐C3N4/graphitized biochar composites

“…Antibiotics have been administered in large quantities in medical and animal husbandry. [1,2] Although it could be degraded with natural conditions, the accumulative effect of antibiotics discharged into the water causes this contaminant to persist in the water. [3,4] If not effectively removed, the resulting flooding of water with low concentrations of antibiotic pollution can harm the environment and ecology.…”

“…Antibiotics have been administered in large quantities in medical and animal husbandry [1,2] . Although it could be degraded with natural conditions, the accumulative effect of antibiotics discharged into the water causes this contaminant to persist in the water [3,4] .…”