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以污泥为原料、纳米钴为改性剂,采用水热法在180℃下反应3 h制备污泥生物碳-纳米钴复合材料,研究了不同纳米钴含量的复合材料对刚果红染料的吸附性能,采用X射线衍射、X射线光电子能谱、电子显微镜、及氮气吸脱附、磁滞回线及热重分析等手段对制备的污泥生物碳-纳米钴复合材料进行表征。结果表明,不同纳米钴掺杂量的复合材料对刚果红的去除率差别较大,当纳米钴质量浓度为8 g/L时,复合材料对刚果红的去除率高达97.3%,较单独污泥水热碳化的材料的去除率提高了54.3%。制备的复合材料是以纳米钴为核心,碳层为外壳的结构。且纳米钴的加入,使得复合材料产生了多孔形貌,复合材料的比表面积从42.65 m~2/g提高到71.58 m~2/g。
Using sludge as raw material and nano-cobalt as modifier, the biochar-nanocrystalline cobalt composite was prepared by hydrothermal method at 180 ℃ for 3 h. The adsorption of Congo red dye on composites with different nanometer content of cobalt The prepared biochar-nanocomposites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, electron microscopy, nitrogen adsorption and desorption, hysteresis loop and thermal gravimetric analysis. The results show that the removal rates of congo red differ greatly between the composites doped with different amounts of nano-cobalt. When the mass concentration of cobalt is 8 g / L, the removal rate of the composites to the congo red is as high as 97.3% The removal rate of hydrothermally carbonized material increased by 54.3%. The prepared composite material is a structure with a nano-cobalt as a core and a carbon layer as a shell. With the addition of nanometer cobalt, the composite has a porous morphology, and the specific surface area of the composite increases from 42.65 m 2 / g to 71.58 m 2 / g.