Biochars derived from giant reed (Arundo donax L.) with different treatment: characterization and ammonium adsorption potential

文献类型： 外文期刊

第一作者： Zhao, Yaqi

作者： Zhao, Yaqi;Huang, Lei;Chen, Yucheng;Zhao, Yaqi;Huang, Lei;Chen, Yucheng

作者机构：

关键词： Arundo donax L.;Biochar;Mild alkali pretreatment;Pyrolysis temperature;Adsorption characteristics;Ammonium

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

ISSN： 0944-1344

年卷期： 2017 年 24 卷 33 期

页码：

收录情况： SCI

摘要： The adsorption characteristics of Arundo donax L.(AD) biochars for ammonium(NH4 (+)-N) were investigated. Absorbents were characterized through scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy analyses. AD-500 and AD-800 were produced from raw AD and pyrolyzed from room temperature to 500 and 800 degrees C, respectively. PD-500 was prepared by impregnating AD with a mild alkali solution and pyrolyzing from room temperature to 500 degrees C. The feasibility of the use of AD-500, AD-800, and PD-500 removing NH4 (+)-N from an aqueous solution was examined. The adsorption system followed the pseudo-first-order model. Results showed that the adsorption capacities of AD-biochars for NH4 (+)-N were enhanced after the final pyrolysis; temperature was increased or the mild alkali pretreatment was administered. When the initial NH4 (+)-N concentration was changed from 4 to 8 mM, the NH4 (+)-N sorption capacity of the biochar increased from 23 to 51%, with the final pyrolysis temperature increasing from 500 to 800 degrees C. The improved ratios were 12 to 33% when the biochar was prepared at 500 A degrees C after the mild alkali pretreatment, and NH4 (+)-N sorption was enhanced due to ion exchange in the PD biochar.

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