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Sorption affinities of sulfamethoxazole and carbamazepine to two sorbents under co-sorption systems.

Environmental pollution (Barking, Essex : 1987) (2014-08-26)
Chi Wang, Hao Li, Shaohua Liao, Di Zhang, Min Wu, Bo Pan, Baoshan Xing
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.

MATERIALS
Product Number
Brand
Product Description

Supelco
Sulfamethoxazole, analytical standard
Sigma-Aldrich
Activated charcoal, suitable for cell culture, suitable for plant cell culture
Supelco
Activated charcoal, powder
Supelco
Activated charcoal, puriss. p.a., powder
Supelco
Activated charcoal, suitable for GC
Supelco
Activated charcoal, for the determination of AOX, 50-150 μm particle size
Supelco
Sulfamethoxazole, VETRANAL®, analytical standard
Sigma-Aldrich
Activated charcoal, DARCO®, 12-20 mesh, granular
Sigma-Aldrich
Activated charcoal, DARCO®, −100 mesh particle size, powder
Sigma-Aldrich
Activated charcoal, DARCO®, 4-12 mesh particle size, granular
Sigma-Aldrich
Activated charcoal, DARCO®, 20-40 mesh particle size, granular
Sigma-Aldrich
Activated charcoal, powder, -100 particle size (mesh), decolorizing
Sigma-Aldrich
Activated charcoal, untreated, granular, ≤5 mm
Sigma-Aldrich
Activated charcoal, untreated, granular, 8-20 mesh
Sigma-Aldrich
Activated Charcoal, meets USP testing specifications
Sigma-Aldrich
Activated charcoal, acid-washed with hydrochloric acid
Sigma-Aldrich
Activated charcoal, untreated, granular, 20-60 mesh
Carbon - Vitreous, rod, 200mm, diameter 1.0mm, glassy carbon
Carbon - Vitreous, foil, 100x100mm, thickness 2.0mm, glassy carbon
Carbon - Vitreous, foil, 8x8mm, thickness 0.5mm, glassy carbon
Carbon - Vitreous, foil, 100x100mm, thickness 1.0mm, glassy carbon
Carbon - Vitreous, rod, 200mm, diameter 10mm, glassy carbon
Carbon - Vitreous, foil, 100x100mm, thickness 6.0mm, glassy carbon
Carbon - Vitreous, foil, 10mm disks, thickness 0.2mm, glassy carbon
Carbon - Vitreous, foam, 150x150mm, thickness 2.5mm, bulk density 0.05g/cm3, porosity 96.5%
Carbon - Vitreous, rod, 200mm, diameter 3.0mm, glassy carbon
Carbon - Vitreous, rod, 200mm, diameter 5.0mm, glassy carbon
Carbon - Vitreous, foil, 8mm disks, thickness 1.0mm, glassy carbon
Carbon - Vitreous, rod, 200mm, diameter 7.0mm, glassy carbon
Carbon - Vitreous, foil, 10x10mm, thickness 4.0mm, glassy carbon