科研之友
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摘要
The pharmaceutical wastewater has the characteristics of high COD concentration，high salinity and poor biodegradability，so it is difficult to treat with by simple physical，chemical or biological methods . While the advanced oxidation process is expected to be used for the advanced treatment of pharmaceutical wastewater because of its strong oxidation capacity.Nano zero-valent iron（nZVI）was prepared by liquid phase reduction of ferric chloride with sodium borohydride. Taking graphite phase C3N4（g-C3N4）as the carrier，a series of Fe/g-C3N4 composite materials with different mass ratio of nZVI and g-C3N4 were prepared by liquid phase reduction surface deposition for catalyzing the advanced oxidation of COD in pharmaceutical wastewater. g-C3N4 can disperse the nZVI load on its surface well and inhibits its agglomeration. In the experiment of removing pharmaceutical wastewater，g-nZVI with mass ratio of nZVI∶g-C3N4=2∶1 showed the highest COD removal efficiency. The highest COD removal efficiency determined by treated pharmaceutical wastewater by g-nZVI reached 75% at pH=3 and the dosage of g-nZVI=1.5 g/L. It has sufficed the standard of continuing degradation in the biochemical reaction tank. Mechanism study showed that the main active substances for COD removal were superoxide radicals and hydroxyl radicals generated by molecular oxygen activated processes driven by nZVI. ? 2023 Editorial Office of Industrial Water Treatment, CNOOC Tianjin Chemical Research and Design Institute Co., Ltd.
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