Issue 5, 2022

Adding exogenous protein relieves the toxicity of nanoparticles to anammox granular sludge by adsorption and the formation of eco-coronas

Abstract

MgO nanoparticles (NPs) are widely used in bactericides, fuel cells and electronic materials and are frequently detected in aquatic environments. Anaerobic ammonium oxidation (anammox) is a highly efficient and economical autotrophic nitrogen removal process. To date, the effects of MgO NPs on anammox granular sludge have remained unknown. This work systematically evaluated the short- and long-term effects of MgO NPs on anammox process performance and explored an effective strategy to relieve stress. The half maximal inhibitory concentration (IC50) of MgO NPs to anammox granular sludge was 69.5 mg L−1. During the long-term experiment, the anammox process experienced a reduction in nitrogen removal ability under the stress of 50.0 mg L−1 MgO NPs. Moreover, the enzymatic activity and synthesis of heme c significantly decreased. Adding 40.0 mg L−1 bull serum albumin (BSA) effectively relieved the stress caused by 50.0 mg L−1 MgO NPs, and the anammox activity recovered to 97.0% of the original level. Multiple spectral analyses verified the adsorption of MgO NPs by BSA. Furthermore, the formation of an eco-corona was observed by transmission electron microscopy, which also contributed to decreasing the biotoxicity of the MgO NPs. The results of this study provide guidance for treating NP-containing wastewater during the anammox process.

Graphical abstract: Adding exogenous protein relieves the toxicity of nanoparticles to anammox granular sludge by adsorption and the formation of eco-coronas

Supplementary files

Article information

Article type
Paper
Submitted
09 Dec 2021
Accepted
17 Mar 2022
First published
18 Mar 2022

Environ. Sci.: Nano, 2022,9, 1794-1804

Adding exogenous protein relieves the toxicity of nanoparticles to anammox granular sludge by adsorption and the formation of eco-coronas

W. Ma, X. Wang, J. Zhang, J. Guo, Y. Lin, Y. Yao, G. Li, Y. Cheng, N. Fan and R. Jin, Environ. Sci.: Nano, 2022, 9, 1794 DOI: 10.1039/D1EN01138C

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements