将铁锰铈(Fe-Mn-Ce)负载于PA6静电纺丝上制备抗团聚性强、吸附效果好且易分离回收的新型吸附剂Fe-Mn-Ce-PA6。扫描电子显微镜(SEM)、X射线衍射(XRD)和傅里叶变换红外光谱(FT-IR)分析均显示Fe-Mn-Ce颗粒已成功负载到PA6静电纺丝上。吸附实验研究结果表明,Fe-Mn-Ce含量为25%时制备的吸附剂对水中Pb(Ⅱ)和Cr(Ⅵ)具有良好的吸附效果,且其在Pb(Ⅱ)初始浓度为10mg/L,吸附剂投加量为0.2g/L,pH为6的条件下对Pb(Ⅱ)的去除率为98%;在Cr(Ⅵ)初始浓度为20mg/L,吸附剂投加量为0.2g/L,pH为6的条件下对Cr(Ⅵ)的去除率为98.5%。该吸附剂对Pb(Ⅱ)和Cr(Ⅵ)的吸附等温模型均符合Freundlich模型,而吸附动力学行为分别符合准一级动力学模型和准二级动力学模型。循环再生实验表明,该吸附剂经五次循环后对Pb(Ⅱ)和Cr(Ⅵ)依然可以保持良好的去除率。
Fe-Mn-Ce was loaded on PA6 electrospinning fibers to prepare a new adsorbent (Fe-Mn-Ce-PA6) with strong anti-agglomeration,great adsorption effect and easy separation and recovery.The results of scanning electron microscopy (SEM),X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) showed that the Fe-Mn-Ce particles were successfully loaded on PA6 electrospinning fibers.Adsorption experiments revealed that the adsorbent prepared with 25% Fe-Mn-Ce had excellent adsorption effect for Pb(Ⅱ)and Cr(Ⅵ) in water,and the removal rate for Pb(Ⅱ) was 98% under the conditions of the initial Pb(Ⅱ) concentration of 10mg/L,the adsorbent dosage of 0.2g/L and pH of 6.The removal rate for Cr(Ⅵ) reached 98.5% under the conditions of the initial Cr(Ⅵ) concentration of 20mg/L,the adsorbent dosage of 0.2g/L and pH of 6.The adsorption isothermal models for Pb(Ⅱ)and Cr(Ⅵ) both conformed to the Freundlich model,while the adsorption kinetic behaviors were in accordance with the quasi primary and quasi secondary kinetic models,respectively.The cycle regeneration experiments indicated that the adsorbent could still maintain good removal rates for Pb(Ⅱ) and Cr(Ⅵ) after five cycles.
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基金资助
陕西省科技攻关项目(2019GY186);陕西省重点研发计划项目(2022GY-161);国家级大学生创新创业训练计划项目(202110709008)
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