载镧胺基纤维对含氟水的吸附处理

Lanthanum-loaded Amino Fiber for the Treatment of Fluoride-containing Water

将稀土镧负载于胺基纤维上制备新型除氟材料(APAN-La),研究了该吸附剂对水中氟的吸附去除性能.研究表明:镧的负载可显著提高APAN-La对氟的吸附去除效果;APAN-La对氟的吸附平衡时间约为120 min,吸附动力学可用拟二级动力学速率方程式描述,吸附以化学吸附为主;25℃时的吸附等温线符合Langmuir吸附等温式,表明单分子层吸附是氟吸附的主要形式,拟合得到的饱和吸附量为6.74 mg/g;溶液pH值对APAN-La的吸附性能影响显著,最佳吸附发生在酸性环境中;NaOH溶液能对吸附饱和的APAN-La进行有效的脱附,从而为该新型除氟材料的再生利用提供理论基础.

A novel lanthanum-loaded amino fibe（r APAN-La）was prepared for adsorption of fluoride from water.Experimental results showed that the load of La could substantially improve the adsorption property of APAN-La for fluoride.The adsorption equilibrium was reached within 120 minutes,and the adsorption kinetic could be well fitted by the pseudo-second-order kinetic equation,indicating a chemical adsorption.The adsorption isotherm under 25℃ could be well described by the Langmuir equation,and the estimated saturated adsorption capacity was 6.74 mg/g,which suggested that monolayer adsorption of fluoride was the primary mechanism of APAN-La.Solution pH had an obvious impact on the fluoride removal,and the optimal adsorption occurred in acidic solutions.After saturation,the adsorbed fluoride could be efficiently desorbed by NaOH solutions,thus providing a theoretical basis for regeneration of this novel defluoridation material.