Issue 1, 2020

Effect of the irrigation water type and other environmental parameters on CeO2 nanopesticide–clay colloid interactions

Abstract

In this work, the stability and aggregation behaviour of CeO2 nanoparticles (NPs) was investigated to predict their fate in the agricultural environment. For this, the aggregation kinetics of CeO2 NPs was studied under varying pH, ionic strength (IS), dissolved organic matter (DOM) and carbonate concentrations in the presence of clay. Furthermore, different types of irrigation water have been used to check the fate of CeO2 nanoparticles (NPs) in complex aqueous matrices. The results show that critical coagulation concentration (CCC) values obtained for CeO2 NPs, i.e. 26.5 mM and 7.9 mM for NaCl and CaCl2 respectively, drastically decreased to 16.2 mM and 1.87 mM in the presence of bentonite clay colloids, which may lead to their deposition within the soil matrix. However, the presence of bicarbonate ions (0.1–2 mM) along with DOM (1–20 mg L−1) may result in their stabilization and co-transport of CeO2 NPs with clay in water bodies having low ionic strength. It was also observed that the negative charge of a bentonite clay suspension was completely reversed with an increase in CeO2 concentration by 37.5 times. The critical charge reversal concentration value was 284.4 mg L−1 in Milli-Q water whereas values were observed to be 680 mg L−1 in synthetic-soft water, followed by natural river water (867 mg L−1) and synthetic-hard water (910 mg L−1). The synergistic effect of temperature and ionic strength was observed on the aggregation behaviour of CeO2 NPs in environmental water samples of varying composition.

Graphical abstract: Effect of the irrigation water type and other environmental parameters on CeO2 nanopesticide–clay colloid interactions

Supplementary files

Article information

Article type
Paper
Submitted
23 set 2019
Accepted
21 nov 2019
First published
21 nov 2019

Environ. Sci.: Processes Impacts, 2020,22, 84-94

Effect of the irrigation water type and other environmental parameters on CeO2 nanopesticide–clay colloid interactions

E. Tiwari, M. Mondal, N. Singh, N. Khandelwal, F. A. Monikh and G. K. Darbha, Environ. Sci.: Processes Impacts, 2020, 22, 84 DOI: 10.1039/C9EM00428A

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