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A Z-scheme iron-based hollow microsphere with enhanced photocatalytic performance for tetracycline degradation

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Abstract

Photocatalytic oxidation has been considered as a potential method for elimination of organic contaminants with low energy consumption. Photodegradation performance is subject to some factors: bandgap, band-edge positions and carrier separation efficiency. Z-scheme heterojunction system can improve photocatalytic performance through optimizing these factors. Thus, a Z-scheme α-Fe2O3/g-C3N4 hollow microsphere was obtained via controlled crosslinking and hydrolysis process (uniform dispersion of two components: through crosslinking; hollow structure: from self-sacrifice of glucose). Numerous constructed pores are beneficial for tetracycline (TC) to adsorb on photocatalysts (7.9 mg/L), which further accelerates TC degradation process. TC degradation rate increased to 67% over α-Fe2O3/g-C3N4-4 (g-C3N4: 48%, α-Fe2O3: 44%) after 2 h irradiation, which results from the quick capture and separation of photogenerated electron–hole pairs and the oxidation and reduction abilities of photocatalysts. This work presents an insight into promoting degradation efficiency of antibiotics and simultaneously reducing photocatalyst cost.

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Acknowledgment

We would like to thank the Analysis and Testing Center of SEU for the characterization of our samples.

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, People’s Republic of China

    Cong Chen, Zhihao Li, Yuting Guo, Liwei Ling, Yingping Zheng, Lili Ren & Min Wu

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  1. Cong Chen
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Correspondence to Min Wu.

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Supplementary Information

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43578_2021_208_MOESM1_ESM.docx

The supplementary material contains equations that are used to calculate bandgap (Eq. S1), apparent rate constant (Eq. S2: pseudo-first-order kinetic model used for describing TC degradation process), adsorption saturation capacity (Eq. S3: pseudo-second-order kinetic model conformed to TC adsorption behavior) and TC degradation rate (Eq. S4). And the results of SEM–EDS tests (Fig. S1) are also provided. Supplementary file1 (DOCX 306 kb).

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Chen, C., Li, Z., Guo, Y. et al. A Z-scheme iron-based hollow microsphere with enhanced photocatalytic performance for tetracycline degradation. Journal of Materials Research 36, 1600–1613 (2021). https://doi.org/10.1557/s43578-021-00208-3

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