川西平原还田秸秆DOM对矿物细颗粒吸附SMX的影响

发布时间：2019-03-22 11:54

【摘要】：为探明还田秸秆溶解性有机质(DOM)对矿物细颗粒吸附磺胺甲恶唑(SMX)的影响机理,研究了矿物细颗粒吸附SMX的动力学过程以及DOM对此过程的影响,比较分析了矿物颗粒吸附前后的傅里叶变换红外光谱(FI-IR)特征.结果表明,SMX在矿物表面的吸附动力学过程符合双室一级动力学模型,表明其吸附过程存在多域吸附或多点位吸附;DOM作用下蒙脱石、钠长石和方解石的吸附量不同程度得到提升,其增量分别为28.94,28.34,2.40μg/g,而3种矿物的模型拟合度均有所降低.通过红外光谱分析,吸附后的蒙脱石较吸附前在波数3700、1600与1000cm~(-1)附近的尖锐吸收峰和在波数3600~3000cm~(-1)的宽吸收带明显减弱,而与DOM作用下波谱基本一致,DOM作用下吸附量的提升与蒙脱石溶出Al~(3+)与DOM结合使得吸附位点增加有关;钠长石在吸附前后红外光谱一致,而DOM作用下在波数1013、781和460cm~(-1)处的吸收峰明显减弱,表明DOM被吸附于钠长石表面,通过共吸附或累积方式增加了吸附量;方解石在吸附前后以及DOM作用下红外光谱基本一致,说明DOM对方解石无影响,吸附的增量则源于DOM对SMX的结合.
[Abstract]:In order to investigate the mechanism of the effect of dissolved organic matter (DOM) on the adsorption of sulfamethoxazole (SMX) by fine mineral particles, the dynamic process of SMX adsorption by fine mineral particles and the effect of DOM on this process were studied. Fourier transform infrared (FI-IR) spectra of mineral particles before and after adsorption were compared and analyzed. The results show that the adsorption kinetics of SMX on mineral surface accords with the first-order dynamic model in two chambers, which indicates that there is multi-domain adsorption or multi-site adsorption in the adsorption process. The adsorption capacity of montmorillonite, albite and calcite increased by 28.94, 28.34 and 2.40 渭 g / g respectively under the action of DOM, while the model fitting degree of the three minerals decreased. The absorption peaks near 3700, 1600 and 1000cm ~ (- 1) and the broad absorption band at 3600cm ~ (- 1) of 3600m ~ (- 1) were obviously weakened after the adsorption of montmorillonite compared with those before adsorption, and the spectra of the adsorbed montmorillonite were basically consistent with those of DOM, and the absorption spectra of the adsorbed montmorillonite were similar to those of the adsorbed montmorillonite under the action of . The increase of adsorption capacity under the action of DOM is related to the increase of adsorption sites due to the binding of montmorillonite dissolution Al~ (3) with DOM. The infrared spectra of albite were consistent before and after adsorption, but the absorption peaks at wave number 1013781 and 460 cm ~ (- 1) of DOM decreased obviously, indicating that DOM was adsorbed on the surface of albite, and the adsorption capacity was increased by means of co-adsorption or accumulation. The infrared spectra of calcite were basically consistent before and after adsorption and under the action of DOM, indicating that DOM had no effect on calcite, and the increment of adsorption was due to the binding of DOM to SMX.
【作者单位】：西南科技大学环境与资源学院;西南科技大学固体废物处理与资源化教育部重点实验室;中国环境科学研究院环境基准与风险评估国家重点实验室;成都树德怀远中学;
【基金】：国家自然科学基金项目(41403081) 四川省应用基础研究计划项目(2015JY0168) 西南科技大学高端引进人才项目(13zx7126);西南科技大学教学改革与研究项目(14xn0019);西南科技大学研究生创新基金资助项目(15ycx035) 绵阳市科技计划项目(15S-02-1)
【分类号】：X131.3;X712

【相似文献】