Sorption of agrochemical model compounds by sorbent materials containing beta-cyclodextrin

J Agromedicine. 2010 Apr;15(2):105-16. doi: 10.1080/10599241003618770.

Abstract

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.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adsorption
  • Agrochemicals / chemistry
  • Charcoal / chemistry
  • Methyl Chloride / chemistry*
  • Nitrophenols / chemistry*
  • Silicon Dioxide / chemistry
  • Water Pollution, Chemical*
  • Water Purification / methods
  • beta-Cyclodextrins / chemistry*

Substances

  • Agrochemicals
  • Nitrophenols
  • beta-Cyclodextrins
  • Charcoal
  • Silicon Dioxide
  • Methyl Chloride
  • betadex
  • 4-nitrophenol