کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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677374 | 1459850 | 2012 | 8 صفحه PDF | دانلود رایگان |
Water pollution caused by ammonia nitrogen has attracted a great attention as its toxicity affects both the environment and human health. The objective of this paper was to investigate the adsorption behavior of NH4+-N from aqueous solution by activated carbons prepared from rice husk. The physico-chemical properties of the activated carbon were characterized by Brunauer-Emmett-Teller (BET) test, Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). It was found that the NH4+-N adsorption on the rice husk derived carbons was dependent on adsorbent dosage and solution pH. The adsorption kinetics and isotherms of NH4+-N by rice husk carbon were also investigated, and good correlation coefficients were obtained for the pseudo-second order kinetic equation. Dubinin-Radushkevitch (D-R) adsorption isotherm model could better describe the adsorption behavior of NH4+-N on the rice husk carbon. Calculated by D-R model, the adsorption course of NH4+-N on the rice husk carbon was favored chemical ion-exchange mechanism. Moreover, the activated carbon adsorbed NH4+-N was highly fertilizer conservation especially for the nitrogen element. It was proposed that the amount of removed NH4+-N from aqueous solutions would increase evidently treated by rice husk carbon if combined with biological method.
► The dosage of rice husk carbon and pH affected the removal of NH4+-N from aqueous solution.
► D-R model could better describe the adsorption behavior of NH4+-N on the rice husk carbon.
► The removing of NH4+-N would be risen by rice husk carbon if combined with biological method.
Journal: Biomass and Bioenergy - Volume 43, August 2012, Pages 18–25