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Current Analytical Chemistry


ISSN (Print): 1573-4110
ISSN (Online): 1875-6727

Research Article

Effect of Suspended Solids and Organic Matter in Water on the Removal of ZnO-NPs by Coagulation

Author(s): Jiaqing Tao, Changrong Zhao, Chang Zhuang, Zhaoyang You* and Kinjal J. Shah*

Volume 18, Issue 10, 2022

Published on: 20 October, 2022

Page: [1131 - 1140] Pages: 10

DOI: 10.2174/1573411018666220826151131


Background: Zinc oxide nanoparticles (ZnO-NPs) have been shown to exert a non-negligible impact on the environment.

Objective: Kaolin and humic acid were used in the aqueous environment to study their effects on the removal of ZnO-NPs.

Methods: In this work, polyaluminum ferric chloride (PAFC)/cationic polyacrylamide (CPAM) coagulants were used together with kaolin and humic acid to study their effects on the removal of ZnO-NPs and analyze their mechanism of action.

Results: The results showed that the removal rate of ZnO-NPs in the humic acid system decreased by about 30% compared to that in the pure water system, and increasing ionic strength and humic acid concentration were not conducive to removing ZnO-NPs. On the other hand, the ZnO-NPs removal rate in the kaolin system was up to 96.28%, and increasing ionic strength and kaolin concentration contributed to the removal of ZnO-NPs. In the humic acid and kaolin systems, the effects of coagulant dosage and pH on the removal of ZnO-NPs were about the same as in the pure water system. Moreover, 5 mg/L humic acid inhibited floc growth during removal of ZnO-NPs by coagulation with PAFC/CPAM. In contrast, 5 mg/L kaolin promoted flocs growth, resulting in stronger and more stable flocs and a 5.25% increase in the fractal dimension compared to the pure water system.

Conclusion: These results suggested that suspended solids and natural organic matter in the water could directly affect the effectiveness of coagulation to remove ZnO-NPs.

Keywords: Metal oxide, kaolin, coagulation, suspended solids, natural organic matter, suspension.

Graphical Abstract

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