In this study, four kinds of graphite oxide (GO) with different oxidation degree have been prepared by a modified Hummers method, by changing the amount of oxidation agent KM_nO₄. To investigate the relationship between the oxidation degree of GO and the adsorption capacity for heavy metal irons, Pb²⁺ solution has been selected as a model waste water. The effects of initial Pb²⁺ concentration, solution pH and contact time on the adsorption capacity of series GO have been studied. It is found that the adsorption capacity does not always increase with the increasing of oxidation degree. The adsorption process of series GO for Pb²⁺ are well described by the Langmuir isotherm model, which reveales that the adsorption process is homogeneous monolayer coverage.

中文翻译：

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GO的氧化度与Pb2 +吸附能力关系的研究

在这项研究中，通过改进的Hummers方法，通过改变氧化剂KM _n O ₄的量，制备了四种氧化度不同的氧化石墨（GO）。为了研究GO的氧化程度与重金属铁的吸附能力之间的关系，选择了Pb ²⁺溶液作为模型废水。研究了初始Pb ²⁺浓度，溶液PH和接触时间对GO系列吸附容量的影响。可以发现，随着氧化程度的增加，吸附能力并不总是增加。GO系列对Pb ²⁺的吸附过程 Langmuir等温模型很好地描述了吸附过程，表明吸附过程是均匀的单层覆盖。