材料期刊网

碳纳米管纱作为填料应用于硝基芳烃污水处理

Sushil R. Kanel , Heath Misak , Dhriti Nepal , Shankar Mall , Seth W. Brittle , Ioana Sizemore , David M. Kempisty , Mark N. Goltz

新型炭材料 doi:10.1016/S1872-5805(16)60021-5

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。

关键词: 碳纳米管纱 , 2,4-二硝基甲苯 , 吸附 , Freundlich吸附等温线 , 新兴技术

Effect of melt superheating on the morphology of MC carbide in a cast Ni-base superalloy M963

武汉理工大学学报-材料科学版(英文版)

The eject of the mall superheating temperature on the as-cast microstructure of a cast nickel-base superalloy M963 has been investigated. The results show that the as-cast microstructure of the alloy consists of gamma solid solution matrix, gamma' precipitate in cubic shape, (gamma + gamma') eutectic and MC carbide, and the morphology of MC carbide in the microstructure can be varied from coarse scriptlike, fine scriptlike to fine cubelike or discontinuous particles by increasing the melt superheating temperature. The mechanism, of melt superheating is discussed by means of differential thermal analysis (DTA) technique.

关键词: cast nickel-base superalloy;melt superheating;MC carbide;differential;thermal analysis