Sorption of agrochemical model compounds by sorbent materials containing beta-cyclodextrin.
Polymeric sorbent materials that incorporate beta-cyclodextrin (CD) have been prepared and their sorption behavior toward two model agrochemical contaminant compounds, p-nitrophenol (PNP) and methyl chloride examined. The sorption of PNP was studied in aqueous solution using ultraviolet-visible (UV-Vis) spectroscopy, whereas the sorption of methyl chloride from the gas phase was studied using a Langmuir adsorption method. The sorption results for PNP in solution were compared between granular activated carbon (GAC), modified GAC, CD copolymers, and CD-based mesoporous silica hybrid materials. Nitrogen porosimetry at 77 K was used to estimate the surface area and pore structure properties of the sorbent materials. The sorbents displayed variable surface areas as follows: copolymers (36.2-157 m(2)/g), CD-silica materials (307-906 m(2)/g), surface modified GAC (657 m(2)/g), and granular activated carbon (approximately 10(3) m(2)/g). The sorption capacities for PNP and methyl chloride with the different sorbents are listed in descending order as follows: GAC > copolymers > surface modified GAC > CD-silica hybrid materials. In general, the differences in the sorption properties of the sorbents were related to the following: (i) surface area of the sorbent, (ii) CD content and accessibility, (iii) and the chemical nature of the sorbent material.
Wilson
Lee D
LD
Department of Chemistry, University of Saskatchewan, Saskatoon, Canada. lee.wilson@usask.ca
Mohamed
Mohamed H
MH
Guo
Rui
R
Pratt
Dawn Y
DY
Kwon
Jae Hyuck
JH
Mahmud
Sarker T
ST
D000327:Adsorption; D016573:Agrochemicals / Q000737:chemistry; D002606:Charcoal / Q000737:chemistry; D008737:Methyl Chloride / Q000737:chemistry*; D009596:Nitrophenols / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D014877:Water Pollution, Chemical; D018508:Water Purification / Q000379:methods; D047392:beta-Cyclodextrins / Q000737:chemistry*
D016573:Agrochemicals; D009596:Nitrophenols; D047392:beta-Cyclodextrins; D002606:Charcoal; D012822:Silicon Dioxide; D008737:Methyl Chloride; C031215:betadex; C024836:4-nitrophenol