title: Effect of humic acid (HA) on sulfonamide sorption by biochars.
abstract: Effect of quantity and fractionation of loaded humic acid (HA) on biochar sorption for sulfonamides was investigated. The HA was applied in two different modes, i.e. pre-coating and co-introduction with sorbate. In pre-coating mode, the polar fractions of HA tended to interact with low-temperature biochars via H-bonding, while the hydrophobic fractions were likely to be adsorbed by high-temperature biochars through hydrophobic and π-π interactions, leading to different composition and structure of the HA adlayers. The influences of HA fractionation on biochar sorption for sulfonamides varied significantly, depending on the nature of interaction between HA fraction and sorbate. Meanwhile, co-introduction of HA with sulfonamides revealed that the effect of HA on sulfonamide sorption was also dependent on HA concentration. These findings suggest that the amount and fractionation of adsorbed HA are tailored by the surface properties of underlying biochars, which differently affect the sorption for organic contaminants.
authors.affiliation: Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China. Electronic address: lianfei2000@gmail.com.
authors.forename: Fei
authors.initials: F
authors.lastname: Lian
authors.affiliation: Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China; College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
authors.forename: Binbin
authors.initials: B
authors.lastname: Sun
authors.affiliation: College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.affiliation: College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
authors.forename: Lingyan
authors.initials: L
authors.lastname: Zhu
authors.affiliation: Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China.
authors.forename: Zhongqi
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, USA.
authors.forename: Baoshan
authors.initials: B
authors.lastname: Xing
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D006812:Humic Substances / Q000032:analysis; D013420:Sulfamethoxazole / Q000737:chemistry*; D000077145:Sulfanilamide; D013424:Sulfanilamides / Q000737:chemistry*
chemical_list: D006812:Humic Substances; D013424:Sulfanilamides; C540010:biochar; D002606:Charcoal; D000077145:Sulfanilamide; D013420:Sulfamethoxazole
keywords: Biochar; Fractionation; Humic acid; Sorption; Sulfonamide