污泥生物碳-纳米钴复合材料的水热法制备及应用

Synthesis and Application of Sludge Biochar/Co Nanoparticles Produced by a Hydrothermal Reaction

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。

The biochar coupled with Cobalt nanoparticle were prepared by a hydrothermal reaction under 180 ℃ for 3 h. The Congo red adsorption properties of composite materials with different amounts of Co dosage were investigated. The samples obtained were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, electron microscopy, nitrogen adsorption-desorption, the hysteresis loop and thermal gravimetric analysis：The results showed that when the mass concentration of Co was 8 g/L, the removal rate was 97.3% which increased by 54.3% compared with the blank test （using solely sludge biochar）. That the structure of composite materials were Co encapsulated by biochar. With the addition of Co, the composite material performed porous morphology, and the specific surface area increased from 42.65 m2/g to 71.58 m2/g.