Department of Chemical Engineering Harcourt Butler Technological Institute, Kanpur 208001, U.P., India.
Centre for Environmental Science and Engineering Indian Institute of Technology Kanpur, Kanpur 208016, U.P., India.
J Hazard Mater. 2014 Jun 15;274:132-44. doi: 10.1016/j.jhazmat.2014.03.020. Epub 2014 Mar 25.
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 Hg(2+) 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 evaluated. 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.
三种不同功能化的多壁碳纳米管被制备出来，分别是氧化的碳纳米管（CNT-OX）、碘掺杂的多壁碳纳米管（CNT-I）和硫掺杂的多壁碳纳米管（CNT-S）。所制备的吸附剂通过各种光谱技术进行结构表征，如扫描电子显微镜（SEM）、能量色散 X 射线（EDAX）、Brunauer、Emmett 和 Teller（BET）比表面积分析仪、傅里叶变换红外（FTIR）和拉曼光谱。碘和硫的负载可以从 EDAX 图谱中看出。Hg(2+)的吸附性能作为 pH 值、接触时间和初始金属浓度的函数进行了冷蒸气原子吸收光谱（Cold vapor AAS）分析。吸附动力学符合准二级动力学模型，90 分钟内达到平衡。实验数据采用 Langmuir、Freundlich、Dubinin-Redushkevich 和 Temkin 等温线进行了拟合，并评估了各种等温线参数。结果表明，制备的吸附剂对汞的吸附容量顺序为 CNT-S>CNT-I>CNT-OX>CNT。已经进行了研究，以证明该吸附剂在从破碎的紧凑型荧光灯（CFL）灯泡中去除 Hg(0)和从受污染的水流中去除 Hg(II)方面的适用性。
