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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K/nF为55.0 mg/g(L/mg)1,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。
Due to its excellent mechanical strength, chemical stability, thermal stability and high specific surface area, CNTY becomes a potential material for removing organic pollutants in wastewater. CNTY is used for wastewater treatment with 2,4-dinitrotoluene (DNT). CNTY DNT adsorption capacity compared with the reported value of the literature, and to explore the adsorption kinetics. SEM-EDX, HRTEM, Raman and XPS were used to characterize the size, surface morphology and surface chemistry of CNTY adsorbed DNT. The results showed that the quality of the DNT wastewater treated by CNTY reached no ionized water purity in the laboratory. The adsorption of DNTY on CNTY conformed to the Freundlich adsorption isotherm. The Freundlich parameter was obtained from K / nF of 55.0 mg / g (L / mg) 1 and the index 1 / n of 0.737. CNTY adsorbs faster than activated carbon, following a pseudo-second order kinetic model. Adsorption of DNT on CNTY induced a constant shift in D and G due to electron acceptor and donor effects between CNTs and DNT.