水合氧化铁对含磷废水的吸附特性研究

以Fe(NO3)3为前驱物,制备了水合氧化铁吸附剂样品,以NaOH为解吸剂,研究了样品对模拟废水中磷酸根的吸附和解吸性能。结果表明,水合氧化铁对磷酸根有较好的吸附效果;随着pH的降低,水合氧化铁对磷酸根的吸附能力增强,在pH为2时吸附达92.5%;吸附前15 min吸附速率较快,约150 min达到平衡,吸附动力学曲线符合二级动力学模型;用水合氧化铁对初始浓度为50~100 mg/L模拟含磷废水吸附,随着初始浓度的增大,磷的去除率下降;水合氧化铁对磷酸根的吸附等温线较符合Langmuir吸附模型;用NaOH对水合氧化铁行解吸,浓度为40 g/L有最好的解吸率,60 min时达到解吸平衡。

Study on Phosphate Contained Wastewater Adsorption by Hydrous Iron Oxide

Hydrous iron oxide(HIO) adsorbent was prepared with Fe(NO3)3 as raw materials,and the sample of HIO for phosphate(P) sorption and desorption was studied using NaOH as the analysis.The results showed that the absorption of phosphate(P) by HIO was rather strong;As pH decreased,the sorption capacity of HIO increased,while absorption removal reaching 92.5% under conditions of pH 2,the absorption rate is faster during 15 minutes and balanced after about 150 min,and the sorption kinetics followed the second-order model.A 50~100 g/L initial concentration was used for desorption of P from HIO,as initial concentration increased,the removal of phosphorus decreased.and the absorption isotherm could be fitted by the Langmuir equation.HIO was desorbed by NaOH,the absorption rate is the best under Concentration of 40 g/L,the adsorption property is balanced after 60 minutes.