Degradation of sulfadiazine by hydroxylamine hydrochloride/Fe-MOFs/persulfate system
WU Cheng-zi1,2,3, ZHANG Wei1,2,3, WAN Yan-tao1,2,3, XIU Guang-li1,2,3
1. State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237; 2. Shanghai Key Laboratory of Environmental Standards and Risk Management of Chemical Pollutants, Shanghai 200237; 3. Shanghai Institute of Pollution Control and Ecological Safety, Shanghai 200092, China
Abstract：Hydroxylamine hydrochloride was used to promote Fe(Ⅲ)/Fe(Ⅱ) cycle in iron-based metal organic framework (Fe-MOFs)/persulfate(PS) system to degrade sulfadiazine (SDZ) in water. The structure and morphology of Fe-MOFs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The influence of initial pH, PS, Fe-MOFs, HA, SDZ, co-existing ions and humic acid on the removal of SDZ were investigated and the prospect for practical application of this system was also evaluated. The results showed that Fe-MOFs/PS/HA system had a good removal performance of SDZ in a wide initial pH range (3~6), and the removal of SDZ at 180min reached above 90.1%. The appropriate amount of HA could promote the degradation of SDZ in Fe-MOFs/PS system. The results of the free radical scavenging and electron paramagnetic resonance experiments showed that the SO4-·、·OH、O2-· and 1O2 were produced in the Fe-MOFs/PS/HA system during the degradation process of SDZ. Within the experiment scope of this study, the degradation performance of SDZ by Fe-MOFs/PS/HA system decreased gradually with the increase of pH value in the range of (pH=3~6). With the increase of the concentration of PS, HA and Fe-MOFs, the removal of SDZ exhibited the rising-then-falling pattern. Chlorine ion, humic acid and other factors had the negative effects on the removal of SDZ in the system in actual surface water, however HA could enhance the degradation of SDZ in the natural environment. The result of recycle experiment revealed that Fe-MOFs system had a good reusability and exhibited a great application potential.
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