Studies on removal of NH4+-N from aqueous solution by using the activated carbons derived from rice husk

被引：98

作者：

Zhu, Kairan ^{[1
]}

Fu, Hao ^{[1
]}

Zhang, Jinghui ^{[1
]}

Lv, Xiaoshu ^{[1
]}

Tang, Jie ^{[1
]}

Xu, Xinhua ^{[1
,2
]}

机构：

[1] Zhejiang Univ, Dept Environm Engn, Hangzhou 310058, Zhejiang, Peoples R China

[2] Huzhou Grad Ctr Environm Sci & Technol Innovat, Huzhou 313000, Peoples R China

来源：

BIOMASS & BIOENERGY | 2012年 / 43卷

关键词：

Activated carbon; Rice husk; Characterization; Adsorption; NH4+-N; Kinetics; ADSORPTIVE REMOVAL; AMMONIA; EQUILIBRIUM; CD(II); ACID;

D O I：

10.1016/j.biombioe.2012.04.005

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

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. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：18 / 25

页数：8

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