| As the world population continues to grow, the development of national industry constantly, now many countries are suffering from the lack of fresh water resources crisis, desalination became the main way to solve the problem. Capacitive deionization technology is a low power, environmental protection, high-tech and efficient desalination. It was conducted by using the theory of electric double layer adsorption and desalination of a new type of water treatment technology. The core of the technology and the key is the preparation of high performance carbon electrode material. This topic use oxide graphite and PAN as raw materials. Through successful preparation of a new type of electrostatic spinning method of r GO/PCNF electrode materials, for a series of characterization of graphene/carbon nanofibers, and focuses on the effect of the presence of graphene on carbon nanofibers and new type electrode adsorption desalting performance.This paper use the electrostatic spinning of GO/PAN material, through SEM and Raman study of graphite oxide add effects on structure and properties of the nanofibers. Studying found that graphite oxide to add, make the diameter of the nanofibers and oxidation with graphite by parcel, embedded between the fibers and the free three ways to connect, careful analysis found that graphite oxide with PAN connection to form a network structure of "face to the line", could improve the ability of electron transfer and ion migration, thus enhance the electrical conductivity of electrode; TG-DTA curve analysis found that piece of rigid structure of graphite oxide layer because of its good thermal performance, so as to improve the thermal stability and thermal effect of the nanofibers.The GO/PAN pre-oxidation under the different temperature, again under the different temperature carbonization, get uniform pore structure, specific surface area and good mechanical properties of r GO/PCNF. Pre-oxidation and carbonization process parameters determined by SEM analysis, the results show that fiber in the pre-oxidation temperature is 250℃, the carbonization temperature 1100℃ when the carbon fiber with good performance; By TEM analysis, found that after thermal reduction of graphene and carbon fiber connection way has three: package, embedded and free, and the different methods of graphene is impact in structure and performance of carbon fiber is different; XRD and Raman analysis showed that the presence of graphene improved the crystallization properties of carbon nanofibers, and the more content of graphene crystal properties of carbon fiber, the better; By nitrogen stripping absorption test of carbon nanofibers, four point probe test and tensile test found that carbon nanofibers containing graphene electrode 43.72 m2/g increased specific surface area, electrical conductivity increased nearly 10 times, showed that the content of graphene, the more the greater the specific surface area and conductivity, but its mechanical properties in the m(GO: PAN) = 0.15:1.0 the best value.Finally, The preparation of r GO/PCNF as self-supporting electrode capacitance to ion technology, for a study of electric adsorption performance comparing different electrode logarithm, electrode spacing, the working voltage, inlet velocity and the added amount of desalination efficiency of graphite oxide. Study found that when the quality of graphite oxide and PAN ratio was 0.15:1.0, the working voltage of 1.5 V, electrode gap of 2 mm, control the water flow to 10 m L/min, The adsorption quantity of carbon nanofibers was 2.02 mg/g. Compared with traditional electrode materials in the literature. New electrode material in capacitance desalting showed higher adsorption capacity and excellent stability. |
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