活性碳纤维阴极电芬顿反应降解微囊藻毒素研究

以具有高比表面积的活性碳纤维作为阴极,通过电芬顿反应降解水中微囊藻毒素(MCRR,MCLR)的电化学方法系统考察了电流密度、pH值和Fe2+浓度等因素对微囊藻毒素降解效果的影响.实验结果表明,在Fe2+浓度为1.0mmol/L和电流密度为6.6mA/cm2条件下,电化学处理60min,MCRR(8.81mg/L)去除率为75%,MCLR(6.36mg/L)去除率为94%.证明过氧化氢可以通过电化学还原在活性碳纤维阴极表面高效产生,微囊藻毒素可被高效降解去除.

Raman Spectrum of SWNTs at Different Excitation Wavelengths

The single-walled carbon nanotubes(SWNTs) was synthesized by electric arc discharge method, and the normal Raman and resonant Raman scattering spectra of SWNTs were measured at 457.5 and 632.8 nm laser excitation wavelengths. By theoretical analysis, the diameter distributions of SWNTs were obtained, the style and configuration parameter were speculated further. By a Lorentzian line-shape analysis of the spectral feature for G mode, the component of the tangential stretch mode of SWTNs was assigned. The variational curve of the value of I-G/I-D for its changing with the variation of the laser power was obtained under 632.8 nm excitation. Disfigurement structure of SWNTs have a variety when laser power is 2.5 mW. In the Raman scattering spectra of SWNTs under 457.5 nm excitation, the new Raman peak under 1 421 cm+{-1} is discovered for the first time.