文献类型： 外文期刊
第一作者： Wei, Lan
作者： Wei, Lan;Chen, Manjia;Wei, Lan;Li, Fangbai;Liu, Chengshuai;Liu, Chuanping;Chen, Manjia;Lan, Qing;Wei, Lan;Wei, Lan;Chen, Manjia
作者机构：
关键词： Aluminum oxide;Chloroacetanilide herbicides;Heterogeneous nucleophiles;Nucleophilic reagent;Nucleophilic substitution
期刊名称：CLEAN-SOIL AIR WATER （ 影响因子：1.77； 五年影响因子：1.955 ）
ISSN： 1863-0650
年卷期： 2013 年 41 卷 9 期
页码：
收录情况： SCI
摘要： The present research elucidates the accelerating effect of alumina minerals on metolachlor transformation using sulfur nucleophiles and also determines the metolachlor transformation mechanisms in the heterogeneous reaction systems. Metolachlor transformation was first systematically investigated under different conditions. Then, the Fourier transform infrared (FTIR) spectra were used to characterize the changes in the surface bonds of the aluminas. The transformation products were qualitatively identified using LC/MS. The results showed that bisulfide can produce efficient metolachlor transformation rates, and the presence of the aluminas can further accelerate the transformation by achieving complete transformation in <21 days. In addition, a higher pH and higher bisulfide concentration are more favorable for metolachlor transformation. When normalized to the surface area, the metolachlor transformation rates were found to follow the order of -Al2O3>-AlOOH>-Al2O3 in the presence of different aluminas. FTIR results indicated that the enhancement of metolachlor transformation rates by bisulfide with aluminas can be attributed to the surface active nucleophiles on alumina surfaces formed through AlS and AlO bonds. The substitution of chlorine on the metolachlor followed the S(N)2 mechanism by bisulfide with accelerated rate through mediating the heterogeneous reactions with aluminas.
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