Guangshan Zhang,Yanei Xue,Qiao Wang,Peng Wang,Hong Yao,Wen Zhang,Jinbo Zhao,Yang Li
Norfloxacin (NOR) is an emerging antibiotics contaminant due to its high resistance to microbial degradation and natural weathering. In this study, Fe-doped ZnS photocatalyst (Zn 0.9 Fe 0.1 S) was deposited on nickel foam (Ni-foam) to improve photocatalytic activity under visible light irradiation. The mass ratio of Zn 0.9 Fe 0.1 S and Ni-foam was optimized to be 0.03 g catalyst versus per g Ni-foam (0.03 Zn 0.9 Fe 0.1 S/Ni-foam), which led to the highest removal rate of 95%. The optimal degradation condition for NOR over 0.03 Zn 0.9 Fe 0.1 S/Ni-foam was pH at 7.0, initial NOR concentration of 5 mg L −1 , and initial photocatalyst concentration of 11.7 g L −1 , with the highest first-order reaction rate constant of 0.025 min −1 and mineralization rate of 63.1%. The NOR removal rate on 0.03 Zn 0.9 Fe 0.1 S/Ni-foam photocatalyst (95%) was approximately four times of that obtained on Zn 0.9 Fe 0.1 S photocatalyst (25%). The increased photocatalytic performance could be attributed to the function of Ni-foam as excellent electron collectors that provided efficient photoinduced charge separation from Zn 0.9 Fe 0.1 S. The reactive species responsible for the degradation of NOR were photo-generated holes, hydroxyl radical , and superoxide radicals. Nearly 90% of the photocatalytic efficiency was retained over seven cycles and the released metal ion concentrations were <0.3% of the total mass of photocatalyst, suggesting high stability of the photocatalyst during the photocatalytic reactions. The aqueous/solid mass transfer and intraparticle mass transfer for Zn 0.9 Fe 0.1 S/Ni-foam were not limiting factors for the degradation of NOR. Therefore the Zn 0.9 Fe 0.1 S/Ni-foam photocatalyst could be applied in the degradation of hazardous pollutants .
Guangshan Zhang,Yanei Xue,Rongjun Su,Qiao Wang,Wen Zhang,Yixing Yuan,Peng Wang
Photocatalysis is an ideal pathway of degradation of emerging contaminants such as endocrine disrupting compounds with least byproducts. This study investigated the synthesis of Zn 0.9 Fe 0.1 S nanoparticles with a one-step microwave irradiation method (MIM) and the photocatalytic degradation of Bisphenol A (BPA) under UV-light irradiation. The results showed that the microwave-assisted synthesis changed the morphology of the catalyst, increased its surface area, shortened the preparation time and improved the activity and longevity of the catalyst in comparison to the traditional hydrothermal method (THM). By tracking the quenching of OH radical, the degradation pathway of BPA by Zn 0.9 Fe 0.1 S photocatalysts was proposed. The effects of reaction solution pH, microwave irradiation time, and power on the catalytic activity were discussed, respectively. The stability and reusability of the catalyst were studied through monitoring dissolved ions release from the catalyst.
Rongjun Su,Yanei Xue,Guangshan Zhang,Qiao Wang,Limin Hu,Peng Wang
The sulfide photocatalyst of Zn 0.9 Fe 0.1 S was successfully synthesized by a facile microwave-assisted method, and Zn 0.9 Fe 0.1 S photocatalysts were characterized using SEM, EDX, XRD and BET. The specific surface area of synthesized Zn 0.9 Fe 0.1 S is 78.1 m 2 g −1 , and total pore volume is 0.4 cm 3 g −1 . With bisphenol A (BPA) as a target pollutant, photocatalytic system of UV + Zn 0.9 Fe 0.1 S + H 2 O 2 was set up. Some influencing parameters, including H 2 O 2 dosage, initial pH value, initial concentration of BPA and Zn 0.9 Fe 0.1 S dosage, were investigated, and the stability of the Zn 0.9 Fe 0.1 S was also studied during the photocatalysis. The optimum values of operating parameters were found at an initial pH value of 5.0, a H 2 O 2 dosage of 0.15 mmol L −1 and a Zn 0.9 Fe 0.1 S dosage of 0.08 g when the initial concentration of BPA was 10 mg L −1 . Under the optimal conditions, the highest removal rate of BPA achieved 95%. After seven consecutive reaction cycles, the degradation efficiency of BPA could still reach 85% and there was only a little dissolution of Zn 2+ and Fe 2+ . Compared with the traditional photo-Fenton system, the UV + Zn 0.9 Fe 0.1 S + H 2 O 2 system can not only improve the degradation efficiency of BPA, but also reduce the dosage of H 2 O 2 and thus reduce the processing cost.
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