Spectroscopic Investigation of Interfacial Interaction of Manganese Oxide with Triclosan, Aniline, and Phenol

• Published in: Environmental science & technology Vol. 50; no. 20; pp. 10978 - 10987
• Main Authors: Shaikh, Nabil, Taujale, Saru, Zhang, Huichun, Artyushkova, Kateryna, Ali, Abdul-Mehdi S, Cerrato, José M
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 18-10-2016
• Subjects: Aqueous chemistry; Chemical reactions; Manganese compounds; Organic chemicals; Organic chemistry; Oxidation; Phenols; Spectrum analysis
• ISSN: 0013-936X; 1520-5851
• DOI: 10.1021/acs.est.6b02673

We investigated the reaction of manganese oxide [MnO x (s)] with phenol, aniline, and triclosan in batch experiments using X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and aqueous chemistry measurements. Analyses of XPS high-resolution spectra suggest that the Mn­(III) content increased 8–10% and the content of Mn­(II) increased 12–15% in the surface of reacted MnO x (s) compared to the control, indicating that the oxidation of organic compounds causes the reduction of MnO x (s). Fitting of C 1s XPS spectra suggests an increase in the number of aromatic and aliphatic bonds for MnO x (s) reacted with organic compounds. The presence of 2.7% Cl in the MnO x (s) surface after reaction with triclosan was detected by XPS survey scans, while no Cl was detected in MnO x -phenol, MnO x -aniline, and MnO x -control. Raman spectra confirm the increased intensity of carbon features in MnO x (s) samples that reacted with organic compounds compared to unreacted MnO x (s). These spectroscopy results indicate that phenol, aniline, triclosan, and related byproducts are associated with the surface of MnO x (s)-reacted samples. The results from this research contribute to a better understanding of interactions between MnO x (s) and organic compounds that are relevant to natural and engineered environments.