文章摘要
江守沛,乔森,周集体.镁修饰多壁碳纳米管吸附回收污水中磷酸盐[J].,2022,62(2):141-148
镁修饰多壁碳纳米管吸附回收污水中磷酸盐
Phosphate recovery from wastewater through adsorption by magnesium modified multi-walled carbon nanotubes
  
DOI:10.7511/dllgxb202202005
中文关键词: 磷回收  吸附  多壁碳纳米管  修饰  脱附
英文关键词: phosphorus recovery  adsorption  multi-walled carbon nanotubes  modification  desorption
基金项目:国家重点研发计划资助项目(2019YFA0705804).
作者单位
江守沛,乔森,周集体  
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中文摘要:
      制备了镁修饰多壁碳纳米管(Mg-CNT)用来吸附回收污水中的磷酸盐,最大理论吸附量(以P计)为211.7 mg/g.通过场发射扫描电子显微镜配备X射线能谱仪(FESEM-EDS)、X射线衍射(XRD)、X射线光电子能谱(XPS)与傅里叶红外光谱(FT-IR)对Mg-CNT进行表征,结果表明MgO纳米片覆盖在多壁碳纳米管表面,并在磷酸盐吸附过程中起主要作用,吸附的产物为Mg3(PO4)2.Langmuir等温吸附模型和准二级动力学模型对磷酸盐的吸附过程拟合较好,表明磷酸盐的吸附为单分子层化学吸附.Mg-CNT对磷酸盐的吸附效果随着溶液初始pH的升高而受到抑制,竞争离子的存在对磷酸盐吸附量没有显著影响.3次吸附-脱附循环后Mg-CNT仍保持了首次吸附时73%的吸附量与较高的磷酸盐脱附率.实验结果表明Mg-CNT在磷酸盐回收方面具有很大的应用潜力.
英文摘要:
      Multi-walled carbon nanotube modified by magnesium (Mg-CNT) is prepared to recover phosphate from wastewater. The theoretical maximum adsorption capacity (based on P) is up to 211.7 mg/g. Mg-CNT is characterized by field emission scanning electron microscopy and energy disperse spectroscopy (FESEM-EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier infrared spectroscopy (FT-IR). The results show that MgO nanoflakes are deposited on the surface of multi-walled CNTs and play a major role in the phosphate adsorption. The adsorption product is Mg3(PO4)2. Langmuir isotherm model and pseudo-second order kinetic model fit the adsorption performance better, which demonstrates that the phosphate adsorbed by Mg-CNT is mono molecular layer chemisorption. The phosphate adsorption performance gets suppression with the increasing of initial pH. The existence of competitive ions has no significant effect on the phosphate adsorption capacity. After three adsorption desorption recycles, Mg-CNT still maintains 73% adsorption capacity of the initial adsorption and high phosphate desorbability. These results imply that Mg-CNT possesses great application potential in phosphate recovery.
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