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Application of biogenic iron precipitation by strain H117 for tetracycline removal: mechanism of adsorption and activation

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Abstract

To date, biogenic metals have opened up a window for new applications in adsorption of contaminants. But there is still little attention to be paid in the removal of tetracycline (TC) by biogenic iron precipitation (BIP). In this paper, the BIP, from iron-based mixotrophic denitrification batch reactor, was estimated for its adsorption property of TC under various parameters to simulate the behavior in aquatic environment. The maximum adsorption capacity for TC was 195.336 mg g−1. Analyses of spectrum verified the existence of Fe3O4 and FeOOH in BIP, which was the main reason for the removal of TC. The adsorption kinetic and isotherm of TC were well fitted to Elovich and Langmuir isotherm models, respectively, indicating that the adsorption process was mainly controlled by chemical adsorption. Furthermore, we proposed a potential mechanism of adsorption: a combination of cation-π, hydrogen bonding (H-bonding), and electrostatic interaction. Additionally, the activation experiment showed that BIP could enhance the degradation of TC (more than 98.00% removal within 1.0 h) by advanced oxidation process (AOP), due to the existence of FeOOH and Fe3O4. Considering its effectiveness in both adsorption and activation performance, BIP is highlighted as an economical and eco-friendly material for TC removal and offers a promising method to resolve sludge disposal in biological treatment of iron-rich groundwater.

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Abbreviations

TC:

Tetracycline

BIP:

Biogenic iron precipitation

H-bonding:

Hydrogen bonding

AOP:

Advanced oxidation process

TCs:

Tetracyclines

SEM:

Scanning electron microscopy

XRD:

X-ray diffraction

FTIR:

Fourier transform infrared spectroscopy

HPLC:

High-performance liquid chromatography

PS:

Persulfate

PFO:

Pseudo-first order

PSO:

Pseudo-second order

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Acknowledgments

This research work was partly supported by the National Natural Science Foundation of China (NSFC) (No. 51978556, No. 51678471), Shaanxi Science Fund for Distinguished Young Scholars (No. 2019JC-31), and The Key Research and Development Program in Shaanxi Province (No. 2018ZDXM-SF-029).

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Junfeng Su: conceptualization, methodology, supervision. Shuai Zhang: investigation, methodology, writing—original draft, writing—review and editing. Zhijie Zheng: investigation, data curation. Lei Xue: methodology, supervision.

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Correspondence to Junfeng Su.

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Responsible Editor: Tito Roberto Cadaval Jr

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Su, J., Zhang, S., Zheng, Z. et al. Application of biogenic iron precipitation by strain H117 for tetracycline removal: mechanism of adsorption and activation. Environ Sci Pollut Res 28, 4815–4826 (2021). https://doi.org/10.1007/s11356-020-10857-2

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  • DOI: https://doi.org/10.1007/s11356-020-10857-2

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