The influence of carboxymethylcellulose (CMC) on the reactivity of Fe NPs toward decabrominated diphenyl ether: The Ni doping, temperature, pH, and anion effects
Journal
Journal of Hazardous Materials
Journal Volume
322
Journal Volume
322
Pages
145-151
Start Page
145
End Page
151
ISSN
03043894
Date Issued
2017-01-15
Author(s)
Tso, Chih-ping
Abstract
Polybrominated diphenyl ethers (PBDEs) are commonly used brominated flame retardants in many products. They have accumulated in the environment and become widely dispersed. In this study, carboxymethylcellulose (CMC) was applied to modify nanoscale zerovalent iron (NZVI) and bimetallic Ni/Fe nanoparticles (NPs) to prevent NP aggregation. In this study the removal kinetics of the decabrominated diphenyl ethers (DBDE) with CMC-stabilized Fe NPs were evaluated. CMC-stabilized Ni/Fe NPs with an average size of 86.7 nm contained metallic Fe 0 and reduced Ni. The colloidal stability decreased with a decrease in pH, which was further accompanied by a change in the removal rate of DBDE. Our results showed that anions do not change the removal rates of DBDE, with the exception of 10 mM NO 3 − , which induced the formation of Fe (hydro)oxides on the Fe NP surface, which could further coagulate with DBDE. This study provides important information for our understanding of the influence of CMC coatings on the reactivity of Fe NPs. Because CMC coatings prevent the passivation of Fe in the presence of anions, CMC-coated Fe NPs show potential for the in-situ remediation of PBDEs in the environment.
Subjects
Anion
Carboxymethyl cellulose (CMC)
Decabrominated diphenyl ethers (DBDE)
Nanoscale zero-valent iron (NZVI)
Stabilized Fe nanoparticles (NPs)
SDGs
Publisher
Elsevier B.V.
Type
journal article