论文部分内容阅读
以酚醛树脂、聚乙烯醇和糠醛的混合物包覆玻璃纤维,经炭化和氯化锌活化制备出一种廉价的纤维状活性炭材料。表征了这种纤维状活性炭材料的表面形态、微晶结构、孔结构、表面化学特征和机械强度,评价了该材料的吸附性能。结果表明,在炭前驱体中加入聚乙烯醇和糠醛可以有效促进孔隙的发育,提升所制备多孔炭材料的孔隙率。当在前驱体中加入聚乙烯醇和糠醛时,所制多孔炭材料的比表面积可达2 023 m~2/g,否则其比表面积则仅为404 m~2/g。聚乙烯醇的加入提高了氯化锌的溶解性,促进了炭前驱体的活化;而糠醛与酚醛交联结构的形成则提高了炭前驱体的热稳定性,提高了炭得率。这两方面的措施均有利于提高样品的比表面积并降低其制备成本。该纤维状活性炭材料具有与传统活性炭纤维相似的微晶结构和吸附性能。
A phenolic resin, polyvinyl alcohol and furfural mixture of glass fiber coated, activated by carbonization and zinc chloride to prepare a cheap fibrous activated carbon material. The surface morphology, crystallite structure, pore structure, surface chemical properties and mechanical strength of this fibrous activated carbon material were characterized, and the adsorption performance of the material was evaluated. The results show that adding polyvinyl alcohol and furfural to carbon precursor can effectively promote the development of pores and increase the porosity of the prepared porous carbon material. When polyvinyl alcohol and furfural were added into the precursor, the specific surface area of the prepared porous carbon material was up to 2 023 m 2 / g, otherwise its specific surface area was only 404 m 2 / g. The addition of polyvinyl alcohol enhanced the solubility of zinc chloride and promoted the activation of carbon precursor. The formation of the crosslinked structure of furfural and phenolic improved the thermal stability and carbon yield of carbon precursor. Both measures are conducive to increase the specific surface area of the sample and reduce its production costs. The fibrous activated carbon material has the similar microcrystalline structure and adsorption performance as traditional activated carbon fibers.