1. Studies on removal of NH4 +-N from aqueous solution by using the activated carbons derived from rice husk
- Author
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Zhu, Kairan, Fu, Hao, Zhang, Jinghui, Lv, Xiaoshu, Tang, Jie, and Xu, Xinhua
- Subjects
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AQUEOUS solutions , *AMMONIA , *FOURIER transform infrared spectroscopy , *SCANNING electron microscopy , *RICE hulls , *ADSORPTION (Chemistry) , *ATMOSPHERIC temperature , *CARBON in soils - Abstract
Abstract: 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. [Copyright &y& Elsevier]
- Published
- 2012
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