【摘要】 使用羧甲基纤维素钠(CMC)对纳米零价铁(NZVI)改性,并将铜(Cu)作为复合金属,制得改性纳米Fe/Cu双金属.同时采用模拟反应柱模拟可渗透反应墙(PRB)去除地下水中2,4-二氯苯酚(2,4-DCP)的反应过程.改性前后材料的表征以及沉降实验结果表明,改性后的材料有更强分散性.通过考察污染物浓度、材料投加量、Cu的负载率、pH值、流量等因素对降解2,4-DCP的影响,结果表明:反应过程符合一级动力学模型,较低的pH值与较小的流速以及10%的Cu负载率有利于2,4-DCP脱氯,过多的材料投加量和过高的初始2,4-DCP浓度不利于其脱氯.更多还原

【Abstract】 Nano zero-valent iron(NZVI) was modified by carboxymethylcellulose sodium(CMC) and copper(Cu) was used as composite metal to prepare modified nanoscale Fe/Cu bimetal. A reaction column was used to simulate the reaction process of 2,4-dichlorophenol(2,4-DCP) removal from groundwater by permeable reactive barrier(PRB). The characterization of the modified materials and the results of the sedimentation experiments showed that the modified materials had stronger dispersity. The effects of concentration of pollutant, dosage of materials, copper loading rate, pH and flow rate on degradation of 2,4-DCP were investigated andthe result showed that the reaction process followed the pseudo first-order kinetics, lower pH, lower flow rate and 10% copper loading rate were beneficial to the dechlorination of 2,4-DCP, and too high dosage of materials and excessive initial concentration of 2,4-DCP were not conducive to dechlorination.更多还原