热改性粉煤灰对水中铜的动态吸附研究

以热改性粉煤灰作为吸附剂，采用固定床吸附装置，探究了床层高度、流量、初始浓度等因素对Cu2+动态吸附曲线的影响。在此基础上进行了动态吸附模型的研究，分别研究了Thomas、Yoon-Nelson和Adams-Bohart三种吸附模型。同时也探讨了双组分污染物体系中MFA对Cu2+的动态吸附效果。结果表明，Cu2+的穿透时间随初始离子浓度和流量的增加而缩短，随床层高度的增加而延长。MFA吸附Cu2+的动态行为符合Thomas和Yoon-Nelson模型。降低床层高度、增加初始浓度和流量可以提高Cu2+的吸附速率。根据MFA吸附Cu2+前后的表征，吸附主要机理包括含氧官能团与Cu2+的络合和Na+等阳离子与Cu2+的离子交换。在双组分污染物体系中，溶液中的Zn2+、Pb2+对MFA的Cu2+吸附均产生抑制作用，其影响大小为Pb2+>Zn2+。 

Study on Dynamic Adsorption of Copper in Water by Thermally Modified Fly Ash

The thermally modified fly ash was applied to adsorb Cu2+ in the fixed-bed column. The effects of bed height, flow rate and initial concentration on the dynamic adsorption curve of Cu2+ were investigated. On such a basis, the adsorption behavior was fitted by dynamic adsorption models. In addition, the dynamic adsorption effect of MFA on Cu2+ in the binary system was investigated. The results showed that the breakthrough time increased with the decrease of initial concentration and flow rate and the increase of bed height. The dynamic adsorption data was well fitted by the Thomas and Yoon-Nelson models. Decreasing the bed height, increasing the initial concentration and the flow rate were conducive to improve the adsorption rate. According to the characterization of MFA before and after the adsorption, the mechanisms of Cu2+ adsorption mainly include the complexation with oxygen-containing functional groups and the cation exchange. The presence of Zn2+ and Pb2+ had the inhibition effect on the adsorption performance of Cu2+,and the influence followed the order of Pb2+>Zn2+.