Download or read book Removal of Perfluorooctanoic Acid Using Zerovalent Iron Based Materials written by Wasiu Adedapo Lawal and published by . This book was released on 2019 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: Perfluorinated alkyl substances (PFASs) are highly persistent organic contaminants that have become a global health concern. Few studies so far have demonstrated successful decomposition of PFASs under ambient condition. As a result, this feasibility study aimed to quickly examine whether or not zerovalent iron (ZVI)-based materials, in particular palladium-doped nanoscale ZVI (so-called nZVI/Pd) known to dehalogenate many halogenated chemicals, can remove perfluorooctanoic acid (PFOA) in water, one of the most widely used PFASs. Batch experiments were performed to evaluate the effects of various operating parameters including reaction pH, nZVI/Pd dose, and PFOA concentration, and thus to find best treatment options for PFOA. Significant removal of PFOA was observed at low pH and high nZVI/Pd dosage while nZVI/Pd was superior to micron-size ZVI and nZVI without Pd. However, decrease in total organic carbon was very similar to PFOA removal, negligible amounts of fluoride ions were detected in water, and mass spectrometry analysis indicated no significant formation of reaction intermediates. The results implied that the observed PFOA removal was more closely associated with adsorption than reaction (i.e., defluorination). Kinetic models and adsorption isotherm models were employed to explain the PFOA removal and obtain insights on the physicochemical processes around nZVI/Pd interacting with PFOA.