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专业: 碳素材料与超硬材料

[交流] 用多功能的多壁碳纳米管吸收汞

Enhanced sorption of mercury from compact ﬂuorescent bulbs and contaminated water streams using functionalized multiwalled carbon nanotubes.Journal of Hazardous Materials 274 (2014) 132–144. 影响因子：4.331
摘要：Three different functionalized multiwalled carbon nanotubes were prepared, namely, oxidized CNTs (CNT OX), iodide incorporated MWCNT (CNT I) and sulfur incorporated MWCNT (CNT S). The as prepared adsorbents were structurally characterized by various spectral techniques like scanning electron microscopy (SEM), energy dispersive X ray (EDAX), Brunauer, Emmett, and Teller (BET) surface area analyzer, Fourier transform infra red (FTIR) and Raman spectroscopy. Loading of iodide and sulfur was evident from the EDAX graphs. The adsorption properties of Hg2+ as a function of pH, contact time and initial metal concentration were characterized by Cold vapor AAS. The adsorption kinetics ﬁtted the Pseudo second order kinetics and equilibrium was reached within 90 min. The experimental data were modeled with Langmuir, Freundlich, Dubinin-Redushkevich and Temkin isotherms and various isotherm parameters were valuated. It was found that the mercury adsorption capacity for the prepared adsorbents were in the order of CNT S > CNT I > CNT OX > CNT. Studies have been conducted to demonstrate the applicability of the sorbent toward the removal of Hg(0) from broken compact ﬂuorescent light (CFL) bulbs and Hg(II) from contaminated water streams.
中文翻译摘要：制备了三种不同的多功能的多壁碳纳米管，即，氧化的CNTs（CNT OX），含碘的MWCNT（CNT I）和含硫的MWCNT（CNT S）。预制备的吸附剂通过各种各样的吸附质在结构上进行表征，例如扫描电子显微镜（SEM），能量色散X射线（EDAX），BET表面积分析，傅里叶变换红外光谱（FTIR）和拉曼光谱学。碘化物和硫的加入由EDAX图表证实。Hg2+的吸收性能与pH、接触时间和最初金属浓度的关系由冷蒸汽原子吸收光谱法表征。吸附动力学与准二级动力学方程相吻合，在90min内达到平衡。实验数据用朗缪尔、弗罗因德利克、杜比宁和特姆金等温线建模，估算了多种等温线参数。发现制备的吸附剂的银吸附能力顺序是CNT S＞CNT I＞CNT OX＞CNT。研究的目的在于将吸附剂应用于去除破碎的灯泡和污染废水中的汞。
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