Reactivity of rimsulfuron in newly formed inclusion combinations by using cyclodextrin and zeolite

Abstract

Extending our investigations on environment protection by agrochemicals diffusion and accumulation, newly formed inclusion combinations of rimsulfuron into zeolite-NaY (Z-NaY)\ud and -cyclodextrin (-CD) were studied and compared. The reactivity of the included herbicide under UV-irradiation and in the dark was assessed. Many guest/host ratios were tested: the best results were found using 3 g (6.953 mmol) of rimsulfuron per kilogram of zeolite, with 80% inclusion success (5.562 mmol kgÿ1), and a 1: 2 molar ratio, 190 g of rimsulfuron per kilogram\ud of -CD with 58% inclusion success. The herbicide Z-NaY-combined underwent rapid and effective (halflive 2–7 h) degradation either catalytically or photochemically, giving rise to\ud different identified by-products. On the contrary, -CD was able to protect rimsulfuron totally both in the dark and under 24-h direct UV irradiation. On the basis of the obtained results,\ud a different utilization of the two inclusion materials has been suggested

Stability and Removal of Naproxen and Its Metabolite by Advanced Membrane Wastewater Treatment Plant and Micelle–Clay Complex

“…Kinetic parameters were calculated by means of integrated equations describing zero‐, first‐, and second‐order reactions using mean values of triplicate data . The best fit was checked by the least‐square method of estimation (data not shown).…”

Transformation Kinetics and Mechanism of the Sulfonylurea Herbicides Pyrazosulfuron Ethyl and Halosulfuron Methyl in Aqueous Solutions

“…Cyclodextrin can reversibly host a variety of guest molecules to form inclusion complexes by noncovalent interaction. Therefore, there is interest in incorporating cyclodextrin into insoluble materials, for example, zeolite and silica , to adsorb pesticide residues for the treatment of drinking water sources. Whereas cyclodextrin has been reported to affect the hydrolysis of some pesticides , , our results suggest that cyclodextrin is not expected to react with PE and HM in aqueous solutions, providing very useful information for the further evaluation of using cyclodextrin-coated sorbents to remove pesticide residues from contaminated water.…”

“…Cyclodextrins are cyclic oligosaccharides consisting of six or more cyclically linked glucopyranose units with numerous primary and secondary hydroxyl groups. Previous studies have shown that cyclodextrins may catalyze the hydrolysis of the pesticides malathion (16) or prevent rimsulfuron hydrolysis and photolysis (17).…”

Complexes of Inclusion of Functionally-Substituted Hydrasons of Isonicothic Acid With Cyclodextrines and Their Antiradical Activity

“…Preparation of inclusion complexes (3)(4)(5) of functionally substituted N-benzylidene-and allylideneisonicotinhydrazide (1,2) with β-and hydroxypropyl-β-cyclodextrin. We chose the method of coprecipitation, since this method makes it possible to obtain a very pure preparation of the inclusion complex in a crystalline form.…”

“…Due to this, CSDs are widely used in the food, cosmetic, pharmaceutical industry, in the production of dyes, in analytical chemistry, in the elimination of environmental pollution by ecotoxicants, etc. [5][6][7].…”