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Environ Sci Pollut Res Int. 2016 Oct;23(19):19107-15. doi: 10.1007/s11356-016-7084-4. Epub 2016 Jun 25.

Adsorption of ammonium on biochar prepared from giant reed.

Hou J1,2, Huang L3,4, Yang Z1,2, Zhao Y1,2, Deng C1, Chen Y1,2, Li X1.

Author information

1
Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resource and Environment, Southwest University, 216 Tiansheng St, Chongqing, 400715, People's Republic of China.
2
Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400716, People's Republic of China.
3
Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resource and Environment, Southwest University, 216 Tiansheng St, Chongqing, 400715, People's Republic of China. panda11@126.com.
4
Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400716, People's Republic of China. panda11@126.com.

Abstract

Giant reed was used as precursor for making biochar in order for the adsorption of NH4 (+)-N from aqueous solution. And the adsorption of the product to NH4 (+)-N was examined. The surface features of biochar were investigated by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy/energy dispersive spectrometer (SEM-EDS), and X-ray diffraction (XRD). XRD patterns showed several peaks and correspond to the high amount of crystalline material. The crystals contain KCl, K2O, CaO, MgO, and SiO and possess high surface area which enhances adsorption. The influence of different parameters such as initial concentration, adsorption time, pH, and ionic strength has been carried out. The adsorption could reach equilibrium through 24 h reaction and had the best adsorption amount at the solution pH values from 7 to 9. The cation has great influence on the adsorption of NH4 (+)-N, whereas the anion exerted a weaker effect. The adsorption followed pseudo-first-order and pseudo-second-order models. And the intraparticle diffusion and desorption studies further elucidated that the mechanism of adsorption on the product was ion exchange. The product equilibrium data was well described by the Langmuir and Freundlich model. The maximum adsorption capacities were 1.490 mg/g. Biochar derived from giant reed at 500 °C was suggested as a promising adsorbent for the removal of NH4 (+)-N from slightly polluted wastewater.

KEYWORDS:

Adsorption experiments; Adsorption kinetics and isotherms; Ammonium; Biochar; Giant reed

PMID:
27344654
DOI:
10.1007/s11356-016-7084-4
[Indexed for MEDLINE]

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