120th General Meeting of the KCS

Type Oral Presentation
Area Current Trends in Environmental and Energy Chemistry
Room No. Room 301
Time THU 10:55-:
Code ENVR.O-8
Subject Removal of Tetrabromobisphenol A in Wastewater using a Sequential System of Bimetallic Nanoparticles and Enzyme
Authors YOON-SEOK CHANG
Division of Environmental Science and Engineering, Pohang University of Science and Technology, Korea
Abstract Tetrabromobisphenol, TBBPA, is an efficient, reliable, and effective flame retardant, but concerns have been raised due to TBBPA's ability to leach into the environment and produce adverse effects on human health and ecosystems overall. This study investigated the degradation of TBBPA using an integrated system consisting of palladized zerovalent iron nanoparticles (Pd/nFe) and an oxidative enzyme, laccase. The Pd/nFe reductively debrominated TBBPA (> 90% of TBBPA) to produce bromo-free byproducts, including bisphenol A (BPA). After that, the metabolites, especially BPA, was rapidly oxidized by laccase in the presence of mediators. The influence of humic acid to activities of Pd/nFe and laccase in nano-enzyme hybrid system was also investigated. The effect of humic acid on remediation efficiency was not significant. In our study, we also observed that NPs treatment and wastewater components are factors which can reduce activity of laccase in BPA degradation. As a result, laccase was encapsulated in the copper-alginate beads (lac-bead) to maintain its activity. The lac-bead system was able to remove over 90% of BPA after 24 h in both NPs treated and wastewater solutions. The results indicate that the nano-enzyme remediation system is a simple remedying system with high pollutant removal efficiency in complex contaminated sites.
E-mail yschang@postech.ac.kr