The Research On Sorption Capacity To The Oils And Recovery Capacity Of Exfoliated Graphite

Recently with the development of petroleum industry and oil tanker accidents in the sea, a great lot of waste water appeared which is high concentration, deep color and complicated constitutions is ejected into the rivers and seas, and the water conditions are polluted badly. Because of the bad pollutions, how to deal with them is the focus and the emphases that people care and research. Now the means of disposition are used including the physical, chemical and biological means. Of the physical means, adsorption is the familiar means which is a attachment process from a matter to another. Concellous solid substances can be used as adsorbents, for example, the activated carbon, adsorption resin.By means of sorption test,scanning electron microscope observation,mercury porosimeter and nitrogen adsorption (BET) measuring, the oil sorption behaviour (diesel oil) of porous carbon materials, such as exfoliated graphite(EG)and plant-charcoal, is studied. Also the influence factors affecting oil adsorption efficiency and the sorption mechanism are discussed as well. Finally, it discussed the methods and efficiency of recovery of oil and exfoliate graphite. Oil and exfoliate graphite after recovery are observated.The oil sorption test show that: worm-like EG samples behave more significant high specific sorption than other absorbent for oil and it has high sorption capacity and sorption rate. The sorption capacity of exfoliated graphite is found to depend strongly on the characteristic of oil and exfoliate graphite and condition of operation. By means of SEM observation, mercury porosimeter measuring, it indicates that worm-like EG samples have network-like porous structures. Owing to a majority of macropores and mesopores inside and on their surface, they are suitable for sorbing oil substances with large molecules size, for example, diesel oil. Finally, the adsorption mechanism of worm-like EG was discussed based on thermodynamics and surface chemistry. We guess that EG samples have the tendency of adsorbing other molecules or atoms voluntary in order to decrease their own surface energy. Besides, attaching many active function groups onto surface similar to oil molecules, they have strong selective adsorption ability.Finally, four methods of regenerating of expanded graphite after adsorbing...