Fabrication of MIL-Fe (53)/modified g-C3N4 photocatalyst synergy H2O2 for degradation of tetracycline

An improved porous g-C3N4 material was prepared by calcination with equal quality of melamine and cyanuric acid. The improved g-C3N4 was recorded as CM and an appropriate amount of MIL-Fe (53) was loaded on the CM to synthesize Fe-MOF/CM (denoted as x% Fe-MOF/CM, which x was the mass of MIL-Fe (53) for a given amount of CM) by self-assembly synthesis method. Photocatalytic degradation experiments showed that the 3 % Fe-MOF/CM-H2O2 system can degrade 100 % tetracycline (10 ppm) within 60 min. The efficiency of this system to degrade tetracycline was about 3.6 times than that of pure g-C3N4. More importantly, the 3 % Fe-MOF/CM-H2O2 photocatalyst system still has excellent degradation effect on high concentration of TC (30 ppm), which can reach about 100 % within 60 min. This system exhibited high degradation efficiency of TC than g-C3N4 and CM, especially under the high concentration of TC condition. The reason could ascribe the addition of Fe-MOF enhanced the adsorption performance of the material. Moreover, Fe3+ and H2O2 formed a Fenton-like system, which enabled the rapid separation of e- and h+. Finally, the possible degradation pathway was suggested through the intermediates identified by GC–MS. The photocatalytic mechanism would provide some suggestions for degradation of TC in waste water.