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Influencing factors on sorption of TNT and RDX using rice husk biochar

机译：稻壳生物炭吸附TNT和RDX的影响因素

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摘要

2,4,6-Trinitrotoluene (TNT) and 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX) are the most commonly used nitro-organic explosives in contemporary military munitions, and readily be introduced into the environment, especially in groundwater supplies. In the present study, rice husk biochar (RHBC) prepared by pyrolysis at 700 degrees C was used for the treatment of TNT and RDX in waste water by batch sorption. The prepared RHBC chemical and physical characteristics were well characterized using analytical spectroscopic techniques. In order to develop the sorption mechanism of TNT and RDX onto RHBC, the factors influencing sorption were studied. The results demonstrated that TNT and RDX sorption depended on the pH value of the aqueous solution, and decreased as pH increased from 2.0 to 6.0 and was attributed with their pKa(1) values along with their physical and chemical characteristics. The batch sorption results revealed that the sorption of the two explosives onto RHBC was rate limiting monolayer chemisorptions on homogeneous surface. These results suggested that the sorption of TNT and RDX occurs through weak electrostatic interactions as well as through charge transfer between - NO2 and pi-pi electrons of explosives and RHBC surface functional groups. (C) 2015 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：2,4,6-三硝基甲苯（TNT）和1,3,5-三硝基-1,3,5-三氮杂环己烷（RDX）是当代军用弹药中最常用的硝基有机炸药，很容易引入环境，尤其是在地下水供应中。在本研究中，通过在700摄氏度下热解制备的稻壳生物炭（RHBC）用于通过分批吸附法处理废水中的TNT和RDX。使用分析光谱技术对制备的RHBC的化学和物理特性进行了很好的表征。为了研究TNT和RDX对RHBC的吸附机理，研究了影响其吸附的因素。结果表明，TNT和RDX的吸附取决于水溶液的pH值，并随着pH从2.0增加到6.0而降低，并归因于它们的pKa（1）值以及它们的物理和化学特性。批吸附结果表明，两种炸药在RHBC上的吸附是均质表面上速率限制的单层化学吸附。这些结果表明，TNT和RDX的吸附是通过弱的静电相互作用以及炸药和RHBC表面官能团的-NO2和pi-pi电子之间的电荷转移而发生的。 （C）2015韩国工业和工程化学学会。由Elsevier B.V.发布。保留所有权利。

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