DIMEPIPERATE ADSORPTION AND HYDROLYSIS ON AL3+-MONTMORILLONITE, FE3+-MONTMORILLONITE, CA2+-MONTMORILLONITE, AND NA+-MONTMORILLONITE

作者：PUSINO A^*; LIU W; GESSA C

来源：Clays and Clay Minerals, 1993, 41(3): 335-340.

DOI：10.1346/CCMN.1993.0410308

• ADSORPTION
• DIMEPIPERATE
• HYDROLYSIS
• INFRARED SPECTROSCOPY
• INTERLAYER CATIONS
• MONTMORILLONITE
• PESTICIDES

The adsorption of the herbicide dimepiperate S-(alpha,alpha-dimethylbenzyl)-1-piperidinecarbothioate on homoionic Fe3+-, Al3+-, Ca2+-, and Na+-montmorillonite was studied in aqueous medium. The adsorption is described well by the Freundlich equation. The adsorption capacity decreases in the order Fe3+ > Al3+ > Ca2+ > Na+ clay. The dimepiperate adsorption from chloroform solution was also investigated by analytical, spectroscopic, and X-ray powder diffraction techniques. IR results suggest that the adsorption involves the interaction of the thioester carbonyl group of dimepiperate possibly with the surrounding water of metal ions. On Al3+ and Fe3+ clays, this interaction leads to hydrolysis of the thioester bond and formation of the thiol and carbamic acid derivatives that yield alpha-methylstyrene and piperidine, respectively.

• 出版日期1993-6
• 单位浙江大学