介孔碳-镍复合物对甲基橙的吸附性能研究

以三嵌段共聚物(F127)作为表面活性剂,低分子量酚醛树脂和六水合硝酸镍分别作为碳源和镍源,利用挥发诱导自组装方法制备了有序介孔碳-镍纳米复合物;采用X射线衍射仪和透射电子显微镜分析了复合物的相组成和微结构;测定了样品的氮气吸脱附特性和对甲基橙的吸附性能,采用二级动力学方程和吸附等温线对吸附结果进行了拟合.结果表明,镍纳米微粒的平均粒径约为20nm;当纳米镍的负载量为2%时,复合物样品具有很高的Brunauer-Emmett-Teller(BET)比表面积(1 610m2/g)和较大的孔容(1.29cm3/g).与此同时,复合物样品的氮气吸脱附特性与二级动力学方程拟合结果具有很好的相关性,吸附量高达324mg/g;吸附等温线拟合结果表明,样品对甲基橙的吸附过程为单分子层吸附,与Langmuir吸附等温式的相关性良好.

Adsorption behavior of methyl orange on mesoporous carbon-nickel composite

Nanocomposite of ordered mesoporous carbon decorated with nickel nanoparticles was synthesized by evaporation-induced self-assembly of carbon source phenolic resin and nickel source Ni（NO3）2 ~ 6H20 in the presence of triblock copolymer F127 as the surfactant. The phase composition and microstructure of as-prepared mesoporous C-Ni nanocomposite were an- alyzed by means of X-ray diffraction and transmission electron microscopy. The adsorption-de- sorption behavior of N2 as well as the adsorption behavior of methyl orange on as-prepared nanocomposite was evaluated, and the adsorption behavior was simulated using pseudo-second- order kinetic model and adsorption isotherm. Results indicate that Ni nanoparticles have an av- erage size of about 20 nm, and the nanocomposite containing 2% Ni （mass fraction） possesses a large Brunauer-gmmett-Teller surface area of 1 610 m2/g and a large pore volume of 1. 29 cma/g. In the meantime, adsorption-desorption analysis and the adsorption kinetics investiga- tion indicated that the adsorption of N2 on as-prepared nanocomposite follows pseudo-second- order kinetic model, with the adsorption capacity being as high as 324 mg/g. The adsorption of methyl orange on the nanocomposite is a monolayer adsorption process, well corresponding to Langmuir adsorption isotherm.