The contamination of surface and ground water by bentazone has attracted increasing global concern in recent years. We conducted a detailed investigation using MIEX resin to eliminate bentazone from waters. Batch expe...The contamination of surface and ground water by bentazone has attracted increasing global concern in recent years. We conducted a detailed investigation using MIEX resin to eliminate bentazone from waters. Batch experiments were carried out to evaluate the effect of process parameters, such as retention time, resin amount, and initial pesticide concentration, on removal efficiency of bentazone. Results showed the sorption process was fast and bentazone could be efficiently removed in 30 minutes. The kinetic process of bentazone sorption on MIEX resin was well described by pseudo second-order model and intraparticle diffusion was the rate controlling step. The MIEX resin possessed the highest sorption capacity of 0.2656 mmol/mL for bentazone according to Langmuir fitting, Bentazone is a hydrophobic ionizable organic compound, and both ionic charge and hydrophobic aromatic structure governed the sorption characteristics on MIEX resin. The different removal efficiencies of ionic and non-ionic pesticides, combined with the charge balance equations of bentazone, SO4^2-, NO3- and Cl-, indicated that removal of bentazone using MIEX resin occurred primarily via ion exchange.展开更多
垃圾渗滤液生化出水COD_(Cr)为924.2 mg/L,MIEX~树脂对垃圾渗滤液生化出水最优投加量为1.725 g∶50.0 m L,COD去除率为56.51%,UV_(254)去除率77.44%。pH为8.72时,MIEX~树脂对垃圾渗滤液生化出水COD和UV_(254)的去除率最高。随着电...垃圾渗滤液生化出水COD_(Cr)为924.2 mg/L,MIEX~树脂对垃圾渗滤液生化出水最优投加量为1.725 g∶50.0 m L,COD去除率为56.51%,UV_(254)去除率77.44%。pH为8.72时,MIEX~树脂对垃圾渗滤液生化出水COD和UV_(254)的去除率最高。随着电解质的加入,MIEX~树脂对垃圾渗滤液生化出水中COD和UV_(254)的去除率降低。升高温度有利于MIEX~树脂对垃圾渗滤液生化出水中COD和UV_(254)的去除。MIEX~树脂可用2 mol/L Na OH溶液再生。机理研究表明:MIEX~树脂可通过阴离子交换和疏水作用去除垃圾渗滤液生化出水中的COD和UV_(254)。展开更多
基金supported by the National High-Tech Research and Development Program (863) of China(No. 2008AA06A414)the National Natural Science Foundation of China (No. 50921064)
文摘The contamination of surface and ground water by bentazone has attracted increasing global concern in recent years. We conducted a detailed investigation using MIEX resin to eliminate bentazone from waters. Batch experiments were carried out to evaluate the effect of process parameters, such as retention time, resin amount, and initial pesticide concentration, on removal efficiency of bentazone. Results showed the sorption process was fast and bentazone could be efficiently removed in 30 minutes. The kinetic process of bentazone sorption on MIEX resin was well described by pseudo second-order model and intraparticle diffusion was the rate controlling step. The MIEX resin possessed the highest sorption capacity of 0.2656 mmol/mL for bentazone according to Langmuir fitting, Bentazone is a hydrophobic ionizable organic compound, and both ionic charge and hydrophobic aromatic structure governed the sorption characteristics on MIEX resin. The different removal efficiencies of ionic and non-ionic pesticides, combined with the charge balance equations of bentazone, SO4^2-, NO3- and Cl-, indicated that removal of bentazone using MIEX resin occurred primarily via ion exchange.
文摘垃圾渗滤液生化出水COD_(Cr)为924.2 mg/L,MIEX~树脂对垃圾渗滤液生化出水最优投加量为1.725 g∶50.0 m L,COD去除率为56.51%,UV_(254)去除率77.44%。pH为8.72时,MIEX~树脂对垃圾渗滤液生化出水COD和UV_(254)的去除率最高。随着电解质的加入,MIEX~树脂对垃圾渗滤液生化出水中COD和UV_(254)的去除率降低。升高温度有利于MIEX~树脂对垃圾渗滤液生化出水中COD和UV_(254)的去除。MIEX~树脂可用2 mol/L Na OH溶液再生。机理研究表明:MIEX~树脂可通过阴离子交换和疏水作用去除垃圾渗滤液生化出水中的COD和UV_(254)。
