title: Interaction of bisphenol A with dissolved organic matter in extractive and adsorptive removal processes.
abstract: The fate of endocrine disrupting chemicals (EDCs) in natural and engineered systems is complicated due to their interactions with various water constituents. This study investigated the interaction of bisphenol A (BPA) with dissolved organic matter (DOM) and colloids present in surface water and secondary effluent as well as its adsorptive removal by powdered activated carbons. The solid phase micro-extraction (SPME) method followed by thermal desorption and gas chromatography-mass spectrometry (GC-MS) was utilized for determining the distribution of BPA molecules in water. The BPA removal by SPME decreased with the increased DOM content, where the formation of BPA-DOM complexes in an aqueous matrix was responsible for the reduced extraction of BPA. Colloidal particles in water samples sorbed BPA leading to the marked reduction of liquid phase BPA. BPA-DOM complexes had a negative impact on the adsorptive removal of BPA by powered activated carbons. The complex formation was characterized based on Fourier transform infrared (FTIR) and ultraviolet-visible (UV-Vis) spectroscopy, along with the calculation of molecular interactions between BPA and functional groups in DOM. It was found that the hydrogen bonding between DOM and BPA would be preferred over aromatic interactions. A pseudo-equilibrium molecular coordination model for the complexation between a BPA molecule and a hydroxyl group of the DOM was developed, which enabled estimation of the maximum sorption site and complex formation constant as well as prediction of organic complexes at various DOM levels.
authors.affiliation: Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Daegu 702-701, Republic of Korea.
authors.forename: Fei-Die
authors.initials: FD
authors.lastname: Zhu
authors.forename: Kwang-Ho
authors.initials: KH
authors.lastname: Choo
authors.forename: Hyun-Shik
authors.initials: HS
authors.lastname: Chang
authors.forename: Byunghwan
authors.initials: B
authors.lastname: Lee
mesh_terms: D000327:Adsorption; D001559:Benzhydryl Compounds; D002244:Carbon / Q000737:chemistry; D005591:Chemical Fractionation / Q000379:methods*; D008958:Models, Molecular; D008968:Molecular Conformation; D016011:Normal Distribution; D009930:Organic Chemicals / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry* / Q000302:isolation & purification*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D002244:Carbon; D009930:Organic Chemicals; D010636:Phenols; C006780:bisphenol A; D000098826:Bisphenol A Compounds