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Investigation on adsorption and regeneration performances of multi-walled carbon nanotubes by supercritical water technique 被引量:1

Investigation on adsorption and regeneration performances of multi-walled carbon nanotubes by supercritical water technique
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摘要 In this paper, adsorption and regeneration characteristics of multi-walled carbon nanotubes (MWNTs) used as adsorbent were investigated for the removal of 1,3-beuzenediol (BDO) from water by the supercritieal water (SCW) technique. FFIR, XPS, SEM and dispersion stability tests were used to characterize the structure and surface morphology of CNTs. The results showed that CNTs surfaces were slightly activated and strongly etched in supercritieal water system. The adsorption capacity of SCW-treated CNTs was higher than that of raw CNTs. The adsorbed amounts for treated CNTs and raw CNTs samples at the same initial concentration of 60 mg/L were ca. 16.42 and 7.30 mg/g, respectively. The BDO adsorption of treated CNTs was due to the physical adsorption. The experimental data fit Freundlich isotherm model better than Langmuir one. The loaded adsorbent could be efficiently desorbed and regenerated by SCW technique. Therefore, SCW is a promising and environmentally friendly technique for the improvement of adsorption and regeneration of CNTs. In this paper,adsorption and regeneration characteristics of multi-walled carbon nanotubes (MWNTs) used as adsorbent were investigated for the removal of 1,3-benzenediol (BDO) from water by the supercritical water (SCW) technique. FTIR,XPS,SEM and dispersion stability tests were used to characterize the structure and surface morphology of CNTs. The results showed that CNTs surfaces were slightly activated and strongly etched in supercritical water system. The adsorption capacity of SCW-treated CNTs was higher than that of raw CNTs. The adsorbed amounts for treated CNTs and raw CNTs samples at the same initial concentration of 60 mg/L were ca. 16.42 and 7.30 mg/g,respectively. The BDO adsorption of treated CNTs was due to the physical adsorption. The experimental data fit Freundlich isotherm model better than Langmuir one. The loaded adsorbent could be efficiently desorbed and regenerated by SCW technique. Therefore,SCW is a promising and environmentally friendly technique for the improvement of adsorption and regeneration of CNTs.
出处 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2009年第3期355-360,共6页 哈尔滨工业大学学报(英文版)
基金 Sponsored by the Project from Natural Scientific Research Innovation Foundation in Harbin Institute of Technology(Grant No. HIT.NSRIF.2008.05)
关键词 MWNTS ADSORPTION supercritical water REGENERATION 多壁碳纳米管 再生性能 环保技术 超临界水 吸附剂 实验数据拟合 表面形貌 光电子能谱
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