Study on the Mechanism of NH_4-N Adsorption by Modified Walnuts Shell
The mechanism of ammonia adsorption on modified walnut shells was studied by the imitation of adsorption isothermal equation and the calculation for adsorption kinetics parameter and thermodynamics parameter such as △G0,△H0 and △S0.The results show that the adsorption meets with Lagergren second rate equation with endothermic and automatic process.Under 305K,310K,315K condition the maximum adsorption capacity reached 9.80,11.11and 13.48g/kg,respectively.The modified walnuts shell was characterized by FTIR and SEM,the result shows that ammonia adsorption on modified nuts shell concerned with physical adsorption and oxido-reduction.The modified walnuts shell is a valuable bioadsorbent.