Adsorption of ammonium on biochar prepared from giant reed
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- 作者：Jie Hou ; Lei Huang ; Zhimin Yang ; Yaqi Zhao…
- 关键词：Biochar ; Giant reed ; Ammonium ; Adsorption experiments ; Adsorption kinetics and isotherms
- 刊名：Environmental Science and Pollution Research
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：23
- 期：19
- 页码：19107-19115
- 全文大小：957 KB
- 刊物类别：Earth and Environmental Science
- 刊物主题：Environment
Environment
Atmospheric Protection, Air Quality Control and Air Pollution
Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
Industrial Pollution Prevention - 出版者：Springer Berlin / Heidelberg
- ISSN：1614-7499
- 卷排序：23
文摘
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.