title: Sorption affinities of sulfamethoxazole and carbamazepine to two sorbents under co-sorption systems.
abstract: The Kd of sulfamethoxazole (SMX) on activated carbon (AC) was larger than that of SMX on single-walled carbon nanotubes (SC), but the competition of SMX with carbamazepine (CBZ) for adsorption sites was weaker on AC than SC. Thus, a large Kd value does not necessarily reflect a high affinity. The analysis of the apparent sorption, competition, desorption hysteresis, and the sorption thermodynamics for SMX and CBZ did not provide sufficient information to distinguish their sorption affinities. The release of the adsorbed CBZ was not altered with SMX as the competitor, but SMX release increased significantly after CBZ addition. The higher sorption affinity of CBZ may be explained by the interactions of the CBZ benzene rings with the aromatic structures of the adsorbents. Although the thermodynamic meaning cannot be described, the release ratio of the adsorbed pollutants provides useful information for understanding pollutant sorption strength and associated risks.
authors.affiliation: Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, China.
authors.forename: Chi
authors.initials: C
authors.lastname: Wang
authors.affiliation: Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Li
authors.affiliation: Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, China.
authors.forename: Shaohua
authors.initials: S
authors.lastname: Liao
authors.affiliation: Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, China.
authors.forename: Di
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, China.
authors.forename: Min
authors.initials: M
authors.lastname: Wu
authors.affiliation: Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, China. Electronic address: panbocai@gmail.com.
authors.forename: Bo
authors.initials: B
authors.lastname: Pan
authors.affiliation: Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, 01003, USA.
authors.forename: Baoshan
authors.initials: B
authors.lastname: Xing
mesh_terms: D065966:Absorption, Physicochemical; D000327:Adsorption; D002220:Carbamazepine / Q000032:analysis* / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D002606:Charcoal / Q000737:chemistry; D037742:Nanotubes, Carbon / Q000737:chemistry; D013420:Sulfamethoxazole / Q000032:analysis* / Q000737:chemistry; D013816:Thermodynamics
chemical_list: D037742:Nanotubes, Carbon; D002606:Charcoal; D002220:Carbamazepine; D002244:Carbon; D013420:Sulfamethoxazole
keywords: Competitive sorption; Complementary sorption; Desorption hysteresis; Sorption strength; Thermodynamics