title: Sorption of polychlorinated biphenyls onto biochars derived from corn straw and the effect of propranolol.
abstract: The sorption of three polychlorinated biphenyls (PCBs) in single-solute and bi-solute systems in the presence of propranolol was studied on biochars at pyrolyzing temperatures of 200°C (BC200) and 700°C (BC700). Hydrophobicity and molecular planarity played a major role in PCB sorption onto BC200 and BC700, respectively. The steric hindrance caused by non-planarity made the strong specific sorption sites on BC700 less accessible to nonplanar PCBs. In bi-solute systems for BC200, propranolol monomers at an initial concentration (Cinit) of 0.8mg/L inhibited the sorption of PCB4 by competing for sorption sites. Propranolol at Cinit larger than 1.2mg/L could form hemimicelle structures on the biochar surface, providing a favorable phase for PCB4 partitioning, thereby increasing Koc up to 1.15 times. For BC700, propranolol prohibited PCB4 sorption mainly by pore-blocking, with the log Koc being reduced from 4.92 to 3.94. This study informs the application of biochar in mixture-contaminated environment.
authors: MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
authors: Fei
authors: F
authors: Wang
authors: MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
authors: Xinhao
authors: X
authors: Ren
authors: MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China. Electronic address: sunhongwen@nankai.edu.cn.
authors: Hongwen
authors: H
authors: Sun
authors: MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
authors: Ling
authors: L
authors: Ma
authors: MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
authors: Hongkai
authors: H
authors: Zhu
authors: MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
authors: Jiayao
authors: J
authors: Xu
mesh_terms: D002606:Charcoal / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D011433:Propranolol / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D003313:Zea mays / Q000737:chemistry*
chemical_list: D012989:Soil Pollutants; C540010:biochar; D002606:Charcoal; D011433:Propranolol; D011078:Polychlorinated Biphenyls
keywords: Bi-solute sorption; Corn straw biochar; Polychlorinated biphenyls; Propranolol; Sorption