Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/157052
Title: Polyoxometalates for bifunctional applications: catalytic dye degradation and anticancer activity
Authors: Ong, Boon Chong
Lim, Hong Kit
Tay, Chor Yong
Lim, Teik-Thye
Dong, Zhili
Keywords: Engineering::Materials
Issue Date: 2022
Source: Ong, B. C., Lim, H. K., Tay, C. Y., Lim, T. & Dong, Z. (2022). Polyoxometalates for bifunctional applications: catalytic dye degradation and anticancer activity. Chemosphere, 286(Part 3), 131869-. https://dx.doi.org/10.1016/j.chemosphere.2021.131869
Project: RG102/18
2018-T1-001-077
Journal: Chemosphere
Abstract: Improving the efficiencies of organic compound degradations by catalytic materials is a challenging materials research field. In our research, we successfully synthesized cobalt-based polyoxometalates (CoV-POMs) via a simple crystallization-driven self-assembly method. The incorporation of the newly synthesized CoV-POMs into peroxymonosulphate (PMS), forming a mixture, greatly enhancing the catalytic activation for a complete degradation of dye solution. The positive synergic effect between CoV-POMs and PMS was substantiated by a relatively meager degradation of less than 10% in the system without CoV-POMs, in which CoV-POMs played a vital role to activate PMS towards free radicals generation for dye degradation. Methylene blue (MB) and rhodamine B (RB) dyes were completely decolorized under 60 min with the presence of 40 mg/L CoV-POMs and 150 mg/L PMS. The CoV-POMs/PMS system was pH dependance with a lower dye degradation efficiency at elevated pH. The effect of pH was more prominent in RB dye, in which the degradation efficiency dropped drastically from 93.3% to 41.12% with the increase in the solution pH from 7 to 11. The quenching tests suggested that sulfate radicals were the dominant active species involving in the dye degradation reaction. Besides MB and RB dyes, CoV-POMs/PMS system also showed significant activity towards the degradation of phenol red (PR) and methyl orange (MO) dyes. In the biological test, CoV-POMs exhibited non-toxic behavior towards normal cells that reduced safety concern for the large-scale wastewater treatment application. In addition, the testing divulged the anticancer property of CoV-POMs with more than 35 % of A549 lung adenocarcinoma and MDA-MB-231 breast adenocarcinoma were killed with 250 mg/L CoV-POMs. The selective lethality of CoV-POMs towards cancer cells was found to be caused by different extents of cellular apoptosis. In overall, the synthesized bifunctional CoV-POMs manifested superior activities in the examined applications, specifically dye degradation and anticancer.
URI: https://hdl.handle.net/10356/157052
ISSN: 0045-6535
DOI: 10.1016/j.chemosphere.2021.131869
Rights: © 2021 Elsevier Ltd. All rights reserved. This paper was published in Chemosphere and is made available with permission of Elsevier Ltd.
Fulltext Permission: embargo_20240207
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
ERI@N Journal Articles
MSE Journal Articles
NEWRI Journal Articles
SBS Journal Articles

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