论文部分内容阅读
以渤海湾北部海域沉积物为研究对象,研究其对重金属Cu2+、Pb2+的吸附特性。将沉积物分为不同粒级,通过吸附动力学、吸附突跃和吸附等温实验,探讨粒度、pH值、吸附时间和吸附剂初始浓度对重金属吸附的影响。结果表明,沉积物粒径越小,对重金属的吸附量越大;吸附平衡时间有所差异,但在1.5 h均能达到吸附平衡;吸附量均随pH值升高而逐渐增加,但铜的吸附较铅的吸附速度快;铜的吸附量与吸附剂初始浓度呈线性关系,而铅的吸附量在初始浓度较低时变化明显,随初始浓度增加吸附量增加减小;铜的吸附等温线符合Freundlich型,而铅吸附等温线符合Langmuir型,吸附类型存在差异。
Taking the sediments of the northern Bohai Bay as a research object, the adsorption properties of heavy metals Cu2 + and Pb2 + were studied. The sediments were divided into different fractions. The effects of particle size, pH value, adsorption time and the initial concentration of adsorbent on the adsorption of heavy metals were discussed by means of adsorption kinetics, adsorption leaps and isothermal adsorption experiments. The results show that the smaller the sediment particle size, the greater the adsorption capacity of heavy metals; the adsorption equilibrium time is different, but the adsorption equilibrium can be reached in 1.5 h; the adsorption capacity increases with the increase of pH, but the copper The adsorption rate of lead was faster than that of lead. The adsorption capacity of copper showed a linear relationship with the initial concentration of adsorbent. However, the adsorption capacity of lead changed obviously at lower initial concentration and decreased with the increase of initial concentration. The adsorption isotherm of copper It is consistent with Freundlich type, while the lead adsorption isotherm conforms to Langmuir type and the adsorption type is different.