Preparation And Electrophoretic Properties Of Nitrogen-Sulfur Doped Carbon Aerogels

As the shortage of fresh water resources has become an important factor restricting the rapid development of today's society and economy, so in recent years, a variety of desalination technology research fiery. Among them, the capacitive deionization (CDI) technology has become a new generation of green desalination technology. CDI technology is driven by external power, so that the ions flowing through the salt solution into the directional into the porous electrode material, and in the form of electric double layer (EDL) stored in the electrode material. It is a kind of green renewable desalination method, and it has very important development prospects. For the development of CDI technology, it is essential to find an electrode material that can be quickly desalted.In this paper, organic aerogels were prepared by sol-gel method using graphene oxide (GO), resorcinol (R), formaldehyde (F), thiourea (T) as raw materials and sodium carbonate (C) as the catalyst. And then through the high temperature carbonation to form a carbon aerogel, which contains two heteroatom S and N. Experiments studied the changes of material properties by varying the thiourea (T) and the amount of the high temperature carbonization temperature. The results show that when the ratio of thiourea(T) to resorcinol (R) is 0.2:1 and the carbonization temperature is 800 ?,the properties of the obtained material are better, and the specific capacitance at the current of 1mA is 182.95 F/g. TRF-0.2 was used as the electrode material for electro-adsorption. The adsorption capacity of TRF-0.2 was 18.35 mg/g when the voltage was 1.2V and the concentration of NaCl solution was 800 mg/L. Indicating that the material used as CDI has a certain value.At the same time, we also experimented with some operating conditions for capacitive deionization (CDI) and membrane capacitive deionization(MCDI) devices. It was found that the adsorption capacity of NaCl in the MCDI device was 37.16 mg/g under 1.2V. The results show that the selectivity of the materials to different salt solutions is mainly related to the ionization radius of the ions. The smaller the ionization radius is, the easier it is to be adsorbed. Finally, the current efficiency and energy consumption of CDI and MCDI devices are analyzed. As the voltage increases, the current efficiency of the electroabsorption device has decreases and the energy consumption has increases.The experimental results show that the operating conditions of CDI and MCDI technology and the influence of equipment parameters on the adsorption effect are learned. In order to solve the shortage of fresh water resources, we provide some theoretical bases and practical bases for TRF as electrode materials.