δ-MnO_2吸附剂对废水中有机染料的去除作用

Removal of Organic Dye from Wastewater with δ-MnO_2

以甲基橙溶液模拟有机染料废水,研究了δMnO2吸附剂对有机染料的吸附特性及影响吸附效果的主要因素.结果表明:在0.05 mol/L的NaNO3介质中,δMnO2甲基橙体系的吸附-pH曲线呈“反S型”,去除率随pH值的降低而增大.甲基橙在δMnO2/水界面上的吸附可用Langmuir吸附等温方程进行描述,温度对吸附等温线影响很小.吸附剂投加量对吸附等温线影响显著,随吸附剂投加量的增大而下移.在25℃,pH6.0、吸附剂投加量为200 mg/L的条件下,甲基橙的饱和吸附量为263 mg/g.甲基橙在δMnO2/水界面上的吸附为不可逆过程.

The adsorption characteristics of methyl orange simulating dye on δ-MnO2and their main affecting factors were studied. The results showed that the adsorption-pH curves have shown ＂reverse S-shape＂ in 0.05 mol/L NaNO3 solution. In addition, the tendency of the adsorption was downward with the increasing of pH value,which was more evident in the middle than at two ends. Langmuir adsorption isotherm was very fit for the adsorption date. Temperature had little effect on adsorption isotherm. But adsorption isotherm decreased evidently with the increasing of adsorbent dose. When the temperature was 25℃ and pH6.0, the maximum amount of adsorption was 263 mg/g. It was found that the adsorption of methyl orange on δ-MnO2 was irreversible.