| The development and application of new materials are very important for the development of the modern economy. Metal-organic porous materials have attracted much attention due to their interdisciplinary knowledge characteristics, and are widely applied in adsorption separation, catalysis, optics, magnetics, etc. So far, the research reports of copper-nickel-metal-organic porous materials used in the liquid phase adsorption are still scarce. Therefore, the properties of large surface area, high porosity, synergies, structural diversification for the dye wastewater treatment based on the requirement of environmental protection is of great current interest.In this paper, two types of metal-organic porous materials, Cu-BTC and Ni/Cu-BTC are synthesized by hydrothermal method. The synthesized samples were characterized by N2 adsorption-isotherms, TG/DTA, XRD, respectively. The structures of Cu-BTC and Ni/Cu-BTC matched that reported in the literatures. The BET specific surface areas of Cu-BTC and Ni/Cu-BTC are 1379 m2/g and 1156 m2/g, and the superior thermodynamic stabilities up to 623 K. The Cu-BTC and Ni/Cu-BTC were evaluated in batch tests for adsorption and separation the dyes (methylene blue (MB) and congo red (CR)) from model wastewater. Various conditions were evaluated, including adsorption equilibrium time, temperature, initial concentration and pH conditions. The results show that that two types of the porous material reached adsorption equilibrium at 240 min. The adsorption capacities of MB and CR increased with the increase in initial solution concentration. Three adsorption and kinetic models including Langmuir, Freundlich, Tekmin pseudo-first-order, pseudo-second-order and intra-particle diffusion equations were used to investigate the adsorption process. The Langmuir isotherm model and pseudo-second-order kinetic model could well describe the MB and CR adsorption behaviors onto Cu-BTC and Ni/Cu-BTC materials. Temperature-dependent adsorption behaviors of MB and CR show that the adsorption is a spontaneous and endothermic process accompanying an entropy increases. The adsorption capacity (1078 mg/g) of CR onto Ni/Cu-BTC which contains bimetallic unsaturated sites was significantly higher than that of single metal Cu-BTC (877 mg/g). It indicates that doping of Cu and Ni two kinds of metal elements on Ni/Cu-BTC material has more excellent properties of dye adsorption.In addition, mesoporous carbon material FAPC-1 is synthesized by a hard template method with the metal-organic porous material Cu-BTC as a template and furfuryl alcohol as carbon source. The material was characterized by N2 adsorption-desorption isotherms, TG/DTA, XRD, TEM, FT-IR. The results showed that the BET surface area and the total pore volume of the sample are 664 m2/g and 0.64 cm3/g, respectively. Its pore size is collectively about 4 nm. As a result, the as-synthesized carbon material was mesoporous structure. CO2 adsorption performance of mesoporous carbon materials FAPC-1 was tested in room temperature and ambient pressure. The results show its adsorption capacity can reach 2.14 mmol/g, which is superior to the other previously reported in the literatures.This thesis work has shown that the single metal especially bimetallic unsaturated organic porous material has an important applications prospect in the field of dye wastewater purification. At the same time, the mesoporous carbon material synthesized with Cu-BTC as a template has a potential application in the field of CO2 gas adsorption storage. |
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