用澳洲坚果壳制备的活性炭从水溶液中吸附六价铬
Sequestration of hexavalent chromium from aqueous solutions by activated carbon derived from Macadamia nutshells.
作者信息
Pakade V E, Nchoe O B, Hlungwane L, Tavengwa N T
机构信息
Department of Chemistry, Faculty of Applied and Computer Sciences, Vaal University of Technology, Private Bag x 021, Vanderbijlpark 1900, South Africa E-mail:
Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg 2050, South Africa.
出版信息
Water Sci Technol. 2017 Jan;75(1-2):196-206. doi: 10.2166/wst.2016.506.
The purpose of this study was to investigate the feasibility of activated carbons prepared from Macadamia nutshells as an efficient adsorbent for the removal of hexavalent chromium (Cr(VI)) from aqueous solutions. The activated carbon was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), CHNS analyzer and Brunauer-Emmett-Teller (BET). For effective removal of Cr(VI), the optimum parameters found were pH 2, 120 min of contact time and 0.2 g of sorbent. The adsorption data fitted well into the Freundlich model, suggesting a multilayer sorption process. The results demonstrated that Macadamia activated carbon could be used as cost-effective biosorbent for the treatment of aqueous solutions contaminated by Cr(VI) with an adsorption capacity of 22.3 mg g. The mode of removal involved adsorption and reduction of Cr(VI) to Cr(III).
本研究的目的是探究用澳洲坚果壳制备的活性炭作为从水溶液中去除六价铬（Cr(VI)）的高效吸附剂的可行性。通过傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、CHNS分析仪和布鲁诺尔-埃米特-泰勒（BET）对活性炭进行了表征。为有效去除Cr(VI)，发现的最佳参数为pH值2、接触时间120分钟和吸附剂0.2克。吸附数据很好地符合弗伦德里希模型，表明是一个多层吸附过程。结果表明，澳洲坚果活性炭可作为一种经济高效的生物吸附剂，用于处理被Cr(VI)污染的水溶液，吸附容量为22.3毫克/克。去除方式包括Cr(VI)的吸附和还原为Cr(III)。
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