Study On Adsorption Characteristic Of Sepiolite

In this study , activated sepiolite get by different active method and the sorbent made by it is used to study the adsorptive capability for ammonia- nitrogen. The main contents includes the method of purify , activation , modify , prilling for sepiolite , and as a main point ,the adsorption characterization also is studied .To get the purified sepiolite the following method can be used . First , large numbers impurity is get rid of by siftted out from the original mine of sepiolite ,then to get rid of remainder impurities by separated the fasciculus in the dispersant solution . However , the actual specific surface of the not activated sepiolite is very less then its theoretic specific surface . So , to get the best capability , the sepiolite must be activated .To get activated sepiolite , different method is taken into account , such as to oxidize by hydrogen peroxide , treat by hydro-thermal method , activate by solution of nitric acid and hydrochloric acid and modify by sodium chloride. As a result , the adsorption capability of sepiolite getting by the first method hardly has no difference , that of sepiolite getting by the second method has a obviously increase , moreover as it is to further activate by sour , comparing to the just purified sepiolite ,the time is shorter, and the acidity is lower , and the adsorbability of sepiolite get by the third way show that the activated sepiolite treat by is better then that get by nitric acid And it is found that under the alkaline system the adsorbability of the sepiolite witch modified by sodium chloride is even better .For the filter function of sepiolite is not ideal , to improve the practicability , the method for making sorbent granule with it is studied . During this study , organic (crylic acid ester , poly vinyl alcohol) , inorganic bond ( clay , bentonite ) and vesicant (sodium bicarbonate ) is considered . And the result indicate that the adsorbability of the sorbent made by organic bond is not ideal compared with that made of inorganic bond , further more , comparing the tow kind of inorganic bond , adsorbability of that made of bentonite is the better .Furthermore , in this study , with the sorbent made of sepiolite , the control mechanism during the progress of adsorption is judged by the broken phase contactmethod and the relationship between separation factor and total mass transfer coefficient is discussed by data get by shallow-bed method .