Preparation And Methyl Orange Adsorption Properties Of Mesoporous Carbon-nickel Composites

With the rapid development of industry, water pollution timely becomes a serious problem.Therefore, the treatments of industrial wastewater have been attracted great attention. As a commonand effective method of sewage treatment, adsorption can simply and quickly remove the pollutantswhich difficult to decompose. In this case, mesoporous carbon materials can be used as adsorbents forthe removal of pollutants from the sewage. They possess high specific surface areas, regular andtunable pore sizes, large pore volumes, as well as stable frameworks for modification orfunctionalization. In this thesis, different kind of mesoporous carbon materials and mesoporouscarbon/magnetic nanoparticles composites have been synthesized successfully, the adsorptionproperties and magnetic separation of methyl orange on these materials have been investigated aswell.Colloidal carbon spheres with diameter around300nm have been synthesized by using theglucose as carbon source. And on this base, silica sol and TEOS were introduced to produce silica solcarbon spheres （SSCS） and SSCS/Ni composites with specific surface area of650m²/g. Bimodal poresize distributions of SSCS and SSCS/Ni composites can be found, and the specific surface area wasnearly twice as much as the ordinary colloidal carbon spheres. The results of research on theadsorption properties of methyl orange showed that maximum adsorption amount on SSCS was214mg/g, adsorption properties of SSCS/Ni composites was declined because of the pore channelplugging by nickel nanoparticles. However, the magnetic composite can be removed by the effect ofmagnetic separation effect rapidly.Mesoporous carbon nanotube （MCNTs） with high specific areas were prepared through a simplysolventhermal method, using glycol as carbon source and zinc acetate as structure constructor. Theyare light weight and bulky. MCNTs/Ni composites were synthesized by the liquid-solid mixturemethod as well, and then these materials adsorption properties of methyl orange were discussed. Theexperimental results showed that maximum adsorption amount on MCNTs was269mg/g. With theaddition of nickel nanoparticles, the adsorption capacity have been reduced by the reason of collapseand aggregated of nanotubes.Ordered mesoporous carbon （OMC） and carbon/nickel composites （OMC/Ni） with2D hexagonalstructure and high specific surface areas have been synthesized via an evaporation-inducedself-assembly method, using phenolic resin as carbon source, triblock copolymer F127as surfactantand TEOS as additive. In this process, there are two roles for TEOS. On the one hand, it can avoid the shrinkage of the materials during the carbonization at high temperate effectively and improve stabilityof the mesoporous carbon. On the other hand, plenty of pores will be generated because of the removeof SiO₂, and specific surface areas of the materials will be increased greatly. With nickel loadingamount increased, the specific surface area and pore volume of these composites was decreasedgradually. Then we use ferric oxide as catalyst to synthesize graphitic ordered mesoporous carbon（G-OMC） materials. Results of methyl orange adsorption properties indicated that adsorptionproperties on OMC were very good and decreased with increase of nickel loading amount. Aftergraphitization treatment, the adsorption of methyl orange was improved, and the time of adsorptionequilibrium was shortened greatly.