海泡石粘土矿物对Pb2+的吸附动力学研究

由于我国经济发展水平地不断提高提高，环境污染愈演愈烈，土壤及水域中重金属铅污染是其中的典型代表。本文研究的海泡石是一种纤维状多孔富镁质的硅酸盐粘土矿物。所以海泡石具有很好的流变及吸附性。本实验通过研究海泡石对硝酸铅溶液中Pb2+的吸附强度，着重实验研究了海泡石用量、初始pH值、温度等因素对Pb2+吸附效果的影响，同时也分析了海泡石粘土矿物相关的吸附动力学吸附方程。通过实验发现,随着温度的升高、用量的增加,海泡石吸附效果也随之增强;在pH值为4~6条件下时,海泡石对Pb2+吸附效果较好;
通过实验研究发现,海泡石用量、温度、pH都符合动力学吸附方程.测得的数据经过准二级动力学模型曲线拟合结果可知：海泡石用量为0.8g时，它的Qe值最大，为9.337（mg·g-1）；在0.2g的海泡石用量条件下它的Qe值为7.980（mg·g-1），温度动力学吸附研究实验结果表明，Qe随着温度的升高而升高（25℃～45℃）。当温度为45℃条件下Qe值为10.060（mg·g-1）。而在研究pH的动力学实验，对其用准二级动力学模型进行拟合后发现，在pH值为6时；Qe的值最大，为9.852（mg·g-1）。

关键词：海泡石；吸附；铅；准二级动力学

 
Study on Adsorption Kinetics of Sepiolite Clay Minerals to Pb2+
Study on Adsorption Kinetics of Sepiolite Clay Minerals to Pb2+
Abstract:With the continuous development of China's economy and the increasing environmental pollution, heavy metal lead pollution in soil and water is a typical example.The sepiolite studied in this paper is a kind of fibrous porous magnesia silicate clay mineral.So sepiolite has good rheology and adsorbability.Through the study on the adsorption strength of sepiolite to Pb2+ in lead nitrate solution, this experiment emphasizes on facts that influence the adsorption effects on Pb2+ such as epiolite consumption, initial pH and temperature, and also analyses relevant adsorption equation in adsorption kinetics of Sepiolite clay minerals.
It was found in the experiment that the adsorption effect of sepiolite increases with the increase of temperature and dosage, and the effect of sepiolite on Pb2+ is better when the value of pH is 4~6, and also dosage, temperature and pH of sepiolite accord with the kinetic adsorption equation.The measured data is fitted by the quasi two order kinetic model. The result shows that when the sepiolite dosage is 0.8g, the Qe value reaches the top of 9.337 (mg g-1).The Qe value is 7.980（mg·g-1）with the sepiolite dosage of 0.2g.The experimental result of adsorption research based on temperature kinetics shows that Qe rises with the rise of temperature (25 ~ 45 C) and the Qe value is 10.060（mg·g-1）with the temperature of 45℃.And fitted by the quasi two order kinetic model, it is found in the pH kinetics experiment that when pH value is 6, the Qe value reaches the climax of 9.852（mg·g-1）.

Key words:  sepiolite;Adsorbent;lead;pseudo-second order kinetic

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