Chlorinated hydrocarbons are widely detected in groundwater, but conventional removal methodologies are not time-and-cost effective. With the development of iron reducing technology in recent years, research on nano-i...Chlorinated hydrocarbons are widely detected in groundwater, but conventional removal methodologies are not time-and-cost effective. With the development of iron reducing technology in recent years, research on nano-iron and nano-bimetal has become a hot spot. The paper presents the results of impact factors on perchloroethylene （PCE） removal by nano-Ni/Fe method. The data show that the reaction rate of unexposed nano-Ni/Fe is 4 times higher than exposed one; and temperature is one of the important controlling factors. Reaction rate constant KSA increases by 2-3 times with every 10℃ increment of temperature. Within a specific range, higher Ni/Fe ratio favors dechlorination process. When the Ni/Fe is 8%, the dechlorination process reaches the highest rate. Dissoved oxygen in the solution does not favor the degradation of chlorinated hydrocarbons.展开更多
采用透射电子显微镜(TEM)和X射线衍射分析(XRD) ,观察化学共还原法制备的纳米W Ni Fe复合粉末,同时研究了添加纳米复合粉末对W95Ni3.5Fe1 .5高比重合金性能的影响。结果表明:共还原法制得的W Ni Fe复合粉末粒度在3 0nm左右,分布均匀,形...采用透射电子显微镜(TEM)和X射线衍射分析(XRD) ,观察化学共还原法制备的纳米W Ni Fe复合粉末,同时研究了添加纳米复合粉末对W95Ni3.5Fe1 .5高比重合金性能的影响。结果表明:共还原法制得的W Ni Fe复合粉末粒度在3 0nm左右,分布均匀,形状呈不规则状;当添加纳米复合粉末的质量所占比例为3 3 .3 %时,所制得的W95Ni3.5Fe1 .5合金密度、致密性最高,硬度亦较好,这与理论分析计算的添加纳米复合粉末的体积比为2 6%相一致。展开更多
基金the National Natural Science Foundation of China （40572146） the project （2002BA906A28-1B） from the Ministry of Science and Technology of China.
文摘Chlorinated hydrocarbons are widely detected in groundwater, but conventional removal methodologies are not time-and-cost effective. With the development of iron reducing technology in recent years, research on nano-iron and nano-bimetal has become a hot spot. The paper presents the results of impact factors on perchloroethylene （PCE） removal by nano-Ni/Fe method. The data show that the reaction rate of unexposed nano-Ni/Fe is 4 times higher than exposed one; and temperature is one of the important controlling factors. Reaction rate constant KSA increases by 2-3 times with every 10℃ increment of temperature. Within a specific range, higher Ni/Fe ratio favors dechlorination process. When the Ni/Fe is 8%, the dechlorination process reaches the highest rate. Dissoved oxygen in the solution does not favor the degradation of chlorinated hydrocarbons.
