水介质中C60纳米晶体颗粒对Cu^(2+)的吸附特性

Adsorption Characteristics of Cu^(2+) by Nano-C60 Aggregates in Aqueous Medium

研究了水介质中C60纳米晶体颗粒(nC60)对Cu2+的吸附性能及其影响因素。结果表明:C60纳米晶体颗粒能够吸附环境污染物重金属铜,其吸附过程符合Langmuir吸附等温模式;C60纳米晶体颗粒对重金属铜的吸附主要为其表面负电荷的静电吸附,吸附容量会随pH值由4增加到5时而增大,但继续增大到6时由于铜离子形态的变化,吸附容量减小;当nC60的浓度增大或存放的时间愈长,其聚集程度愈大,会使表面有效吸附位点有所减少,影响吸附效果。水介质中C60纳米晶体颗粒对Cu2+的吸附性能研究对于评价富勒烯纳米材料排入水体后的环境效应具有重要意义。

The work presents the adsorption and its influencing factors of copper by aqueous nano-C60 aggregates. Results show that nC60 aggregates could effectively adsorb the copper from aqueous solution, and it obeys the Langmuir isothermal adsorption mod- el; the adsorption of Cu2＋ by nC60 aggregates mainly owes to its surface negative charged attraction. When the pH is designed at 5, the adsorption capacity of Cu2＋ by nC60 is the highest compared to the situation when pH is 4, but the adsorption capacity decreased when the pH was designed at 6 mainly due to the change of Cu ion form. When the nC60 aggregates＇ concentration increased or the preservation time for nC60 aggregates extended, the adsorption of Cu2＋ by nC60 aggregates decreased because the increasing of the nC60 concentration or its preservation time could increase its aggregation extent of nC60 aggregates, which could decrease its surface adsorption sites, and thus decrease its adsorption capacity for Cu. The results suggest that nC60 aggregates can change the transport and fate of existing environmental pollution.