碳纳米管纱( CNTY)因具有优异的力学强度、化学稳定性、热稳定性和高比表面积而成为去除废水中有机污染物的潜在材料。本文将CNTY用于含2,4-二硝基甲苯(DNT)的污水处理。 CNTY对DNT的吸附能力与文献报道值作对比研究,同时探讨吸附动力学。采用SEM-EDX、HRTEM、Raman与XPS表征CNTY吸附DNT前后的尺寸、表面形貌及表面化学。结果表明,经CNTY对DNT污水处理后的水质达到实验室无离子水级纯度。 CNTY对DNT吸附符合Freundlich吸附等温线, Freundlich参数由KF 为55.0 mg/g (L/mg)1/n,指数1/n为0.737得到,表明其比活性炭吸附性弱,但更易再生。 CNTY比活性炭的吸附性速率更快,遵循拟二级动力学模型。 CNTY吸附DNT引起D、G常偏移,归因于CNTs与DNT间电子受体和供体效应。
Carbon nanotube yarn ( CNTY) is a promising material for the removal of organic contaminants from aqueous waste streams owing to its extraordinary mechanical strength, chemical stability, thermal stability and high surface area. CNTY was used to treat water contaminated with a model nitroaromatic compound, 2,4-dinitrotoluene (DNT). The isotherms and kinetics of DNT adsorption onto CNTY were investigated. The adsorption capacities of DNT were compared with the literature values of alternative sorbents. SEM-EDX, HR-TEM, Raman spectroscopy and XPS were used to characterize the size, surface morphology and surface chemistry of the CNTY before and after DNT adsorption. Results indicate that adsorption isotherm of DNT onto CNTY could be fit-ted by the Freundlich isotherm with a Freundlich constant, KF, of 55. 0 mg/g (L/mg)1/n and a Freundlich exponent, 1/n, of 0. 737. Adsorption kinetics can be formulated by the pseudo-second order kinetic model. This study demonstrates the ability of CNTY to remove organic contaminants from water.
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