科研之友
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摘要
Developing a novel and highly efficient catalytic oxidation system for environmental protection was an important task. In this work, inspired by the photocatalytic system and peroxydisulfate (PDS) system, the magnetic gamma-Fe2O3/h-BN composite was designed for synergetic catalytic. The tetracycline was selected to study the degradation activity of all-obtained samples. Among, the sample with a weight ratio of 7% has the optimum catalytic performance. The enhanced catalytic performance was attributed to the separation of electron-hole pairs and contact with pollutant of gamma-Fe2O3/h-BN composite. Under visible-light illumination, the gamma-Fe2O3/h-BN composite could generate superoxide free radicals (O-2(center dot-))) and holes (h(+)) to decompose pollutant, while the addition of PDS, the PDS would excite to generate hydroxyl radicals (center dot OH) and sulfate radicals (SO4 center dot-) for further degrading pollutant. Under optimal condition, the degradation rate reached 90% within 90 min. In addition, the investigation of tetracycline (TC) degradation under different experimental conditions (pH, catalyst dosage, PDS concentration, various salt) was conducted. This study provided a novel synergetic catalytic system for wastewater treatment.
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