偕胺肟纤维对还原蓝RSN的吸附研究

Adsorption Properties of Vat Blue RSN by the Fiber Containing Amidoxime Groups-Fe(Ⅲ)

目的研究偕胺肟纤维对还原蓝RSN吸附的工艺条件、吸附规律及吸附反应动力学,从而为治理染料废水污染提供新的方法。方法以偕胺肟化的聚丙烯腈纤维与铁离子反应形成偕胺肟合铁(Ⅲ)纤维作为吸附材料,吸附水溶液中的还原蓝RSN。根据不同的还原蓝RSN初始浓度下吸附时间与吸附后平衡溶液的浓度的关系,用微分法确定反应级数和反应速率常数。由不同温度下的速率常数结合Arrhenius方程得出反应的活化能。结果偕胺肟合铁(Ⅲ)纤维吸附还原蓝RSN的最佳工艺条件,pH值为10.5,温度为45℃,吸附时间为80min。偕胺肟合铁(Ⅲ)纤维对还原蓝RSN的吸附符合Freundlich等温吸附经验式和一级反应动力学特征。结论偕胺肟纤维对还原蓝的吸附工艺简单,偕胺肟纤维具有吸附容量大、吸附速率快、原材料来源广泛、价格便宜和制备简单等优点,可望应用于实际工业废水的处理。

Objective To find new methods to control the pollution of dye, the law of adsorption and adsorption kinetics of vat blue RSN by amidoxime fiber were studied. Methods The amidoxime-Fe（Ⅲ） adsorption fiber was made from PAN fiber containing amidoxime groups reaction with Fe^3＋. The adsorption of vat blue in the aqueous solution on the amidoxime-Fe （Ⅲ） adsorption fiber was studied. The reaction order was determined by infinitesimal calculus, based on the relationship between the adsorption time and the concentration of vat blue. The activation energy was obtained by the rate constant of different temperature and the Arrhenius equation. Results The results of adsorption showed the optimal condition： pH was 10.5, the temperature was 45 ℃ and adsorption time was 80 min. The absorption was accorded with the Freundlich isotherm and the character of the first-order reaction. Conclusion The process of vat blue RSN adsorption by amidoxime fiber is simple and the raw materials of amidoxime fiber is very cheap, so it may be expected to apply to the industrial wastewater treatment