【摘要】 利用荔枝皮与Fe3O4合成了磁性微球吸附材料(MLP),并对MLP吸附溶液中Pb2+、Cd2+、Zn2+、Ni2+的影响因素、吸附等温线、动力学、热力学等进行了研究。结果表明:p H和吸附剂投加量对Pb2+去除率的影响较大,而对Cd2+、Zn2+、Ni2+的影响较小;Pb2+和Ni2+的吸附平衡时间分别为100和60 min。MLP对Pb2+、Cd2+、Zn2+、Ni2+的吸附过程均可以用Langmuir等温线模型进行较好的拟合,其最大吸附容量的大小顺序为:Pb2+>Zn2+>Cd2+>Ni2+。MLP吸附Pb2+属于自发放热过程,而对Cd2+、Zn2+、Ni2+的吸附属于非自发放热过程。MLP对4种金属离子的吸附过程遵循准二次反应机理。更多还原

【Abstract】 Magnetic microspheres of litchi pericarp(MLP) were synthesized by the composite materials of litchi pericarps and Fe3O4 as new adsorbents, and the influencing factors, adsorption isotherm models, kinetics and thermodynamics that Pb2+、Cd2+、Zn2+、Ni2+ were adsorbed by MLP were investigated by means of using static experimental method. The results showed that p H and adsorbent dosage exhibited a significant impact on the removal rate of Pb2+. However, There was a little effect on that of Cd2+ 、 Zn2+ 、 Ni2+. The equilibrium time of Pb2+ and Ni2+ adsorption were 100 and 60 min,respectively. The adsorption processes of Pb2+ 、 Cd2+ 、 Zn2+ 、 Ni2+ onto MLP could be well described by Langmuir isotherms models, and the order of maximum adsorption capacity was Pb2+>Zn2+>Cd2+>Ni2+. Additionally, the adsorption process was spontaneous and exothermic for Pb2+ by MLP, while non-spontaneous and exothermic for Cd2+, Zn2+, and Ni2+.The adsorption kinetics of Pb2+、Cd2+、Zn2+、Ni2+ were all well conformed to the pseudo-second-order model.更多还原