The Preparation Of New Type Ammonia Nitrogen Adsorbent Removal And The Inquiry Of Adsorption Properties

Today, with the rapid development of human society, landscape water has been a part of people’s lives, the studies have shown that: When nitrogen and phosphorus ratio over 16:1, it is thought that the eutrophication has happened. This subject mainly aim at attapulgite and zeolite,its pore channels contain crystal water and large amounts of magnesium and silicon ions features. Utilized attapulgite and zeolite composite modified, that can get an efficient and cheap ammonia nitrogen adsorbent,thereby reduce the ammonia content, breaking the proportion of nitrogen and phosphorus in the water, restrain the eutrophication.Preparation by single factor experiment to determined the optimal conditions and the best modified adsorbent, Taking the same quality of attapulgite and sodium hydroxide roasted 2h in a muffle furnace at 500℃, under these conditions prepared an alkali+roasting modified attapulgite. Under Na Cl concentration is 0.8mol/L,microwave modified 8min, microwave power 750 w conditions, through it can prepared a Na Cl+microwave modified zeolite. Considering the economic rationality, Taking the same quality of alkali+roasting modified attapulgite and Na Cl+microwave modified zeolite roasted 2h in a muffle furnace. Through orthogonal test to determine the best adsorption conditions, taking 2g modified sorbent into the composite volume of 100 m L concentration of 100 mg /L ammonia solution, The new type of composite modified adsorbent with 2.0g are joined in 100 m L water, its initial concentration for 50 mg/L,p H is 6, the temperature is 30℃, the adsorbing time is 2h, the ammonia removal efficiency is 90.5% and the adsorption capacity is 4.53mg/g.In order to characterize the adsorbing mechanism of composite modified adsorbent, the experiment researches the adsorbing equilibrium and kinetics model law,The result shows: At 25 ° C, the composite modified adsorbent adsorbs to the balance extent, its isothermal process fits the Freundlich isothermal type, its equation is 066.2145.1e=CQ,the fitting correlation of the formula is R2=0.9880, while the composite modified adsorbent adsorption process fits the pseudo-second-order kinetic adsorption model, its pseudo secondary dynamics equation is t/Qt=0.00474+0.166 t, the fitting correlation of the formula is R2=0.9998。...