Removal of Chlorpheniramine and Variations of Nitrosamine Formation Potentials in Municipal Wastewaters by Adsorption Onto the GO-FeO
Overview
Toxicology
Affiliations
Chlorpheniramine is a pharmaceutical pollutant and a precursor of carcinogenic nitrosamines during disinfection/oxidation. In our previous study, graphene oxide coated with magnetite (GO-FeO) was capable of removing chlorpheniramine in deionized water by adsorption. This study investigated the removal of chlorpheniramine and its nitrosamine formation potentials (FPs) by adsorption onto magnetic GO-FeO, with respect to the influence by using real municipal wastewaters as the background. In the results, the adsorption performances of chlorpheniramine in wastewaters decreased in the order: GO-FeO suspension > GO-FeO particles > activated carbon. Chlorpheniramine adsorptions on GO-FeO particles and activated carbon were reduced by using real wastewaters as the background, whereas chlorpheniramine adsorption on GO-FeO suspension was enhanced due to the effects of surface charge on GO-FeO and ionic strength variation in water. The fittings of adsorption isotherms indicated that the wastewater background reduced the surface heterogeneity of GO-FeO suspension and improved the adsorption performance. Appreciable removal efficiencies of NDMA and other nitrosamine FPs were observed when GO-FeO particles were added in real wastewaters. However, when chlorpheniramine was present in wastewaters, chlorpheniramine adsorption and degradation reaction simultaneously occurred on the surface of GO-FeO, increasing NDMA and other nitrosamine FPs in wastewaters after GO-FeO addition for chlorpheniramine adsorption. The assumption was further demonstrated by observing the NDMA-FP increase during chlorpheniramine adsorption on GO-FeO in deionized water. GO-FeO is a potential adsorbent for chlorpheniramine removal. Nevertheless, the low treatment efficiencies at high doses limit its application for nitrosamine FP adsorptions in real wastewaters.
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Lin C, Chen W Nanomaterials (Basel). 2021; 11(12).
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