Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Heterogeneous Nucleophilic Transformation of Metolachlor by Bisulfide on Alumina Surface
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 α‐Al2O3>γ‐AlOOH>γ‐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 SN2 mechanism by bisulfide with accelerated rate through mediating the heterogeneous reactions with aluminas.
Heterogeneous Nucleophilic Transformation of Metolachlor by Bisulfide on Alumina Surface
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 α‐Al2O3>γ‐AlOOH>γ‐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 SN2 mechanism by bisulfide with accelerated rate through mediating the heterogeneous reactions with aluminas.
Heterogeneous Nucleophilic Transformation of Metolachlor by Bisulfide on Alumina Surface
Wei, Lan (Autor:in) / Li, Fangbai (Autor:in) / Liu, Chengshuai (Autor:in) / Liu, Chuanping (Autor:in) / Chen, Manjia (Autor:in) / Lan, Qing (Autor:in)
CLEAN – Soil, Air, Water ; 41 ; 856-864
01.09.2013
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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