N,N-二甲基乙酰胺在水体泥沙中的吸附及光解特性

Adsorption and Photodegradation of N,N-Dimethylacetamide on Suspended Sediment Particles in Water

实验室模拟条件下研究了泥沙对N，N-二甲基乙酰胺（DMAC）的吸附和光解特性以及影响因素．结果表明：DMAC在泥沙中的吸附同时符合Langmuir模型和Freundlich模型．不同紫外光照强度下，DMAC的光解反应半衰期均大于8h．DMAC的光解率随光照强度的增大而增大；在ρ（DMAc）较低范围（〈20mg／L）内，同一紫外光照强度下，初始ρ（DMAC）越高光解速率越快；在pH为6～9的自然环境中，初始pH越高越有利于DMAC的光解；当水体中含有腐殖酸时，DMAC的光解率显著降低．

Adsorption and photodegradation of N, N-dimethylacetamide （DMAC） on suspended sediment particles in water and their influence were studied experimentally. The results demonstrate that DMAC adsorption on sediment particles is in accordance with both the Langmuir and Freundlieh models. The photolytie half-life of DMAC in water is longer than 8 h under different UV illumination intensities. Photodegradation of DMAC in water increases with increasing UV illumination intensity. The photodegradation rate of DMAC is higher with higher initial mass concentration under the same UV illumination intensity in the lower mass concentration range （ 〈 20 mg/L）. The DMAC photodegradation rate increases with the increase of pH in natural pH conditions of 6-9, and decreases remarkably with coexistence of humie acid in water.