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首页> 美国卫生研究院文献>Materials >Preparation of a Novel Millet Straw Biochar-Bentonite Composite and Its Adsorption Property of Hg
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Preparation of a Novel Millet Straw Biochar-Bentonite Composite and Its Adsorption Property of Hg

机译：新型小米秸秆生物炭 - 膨润土复合材料的制备及其HG的吸附性能

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The remediation of mercury (Hg) contaminated soil and water requires the continuous development of efficient pollutant removal technologies. To solve this problem, a biochar–bentonite composite (CB) was prepared from local millet straw and bentonite using the solution intercalation-composite heating method, and its physical and chemical properties and micromorphology were then studied. The prepared CB and MB (modified biochar) had a maximum adsorption capacity for Hg2+ of 11.722 and 9.152 mg·g−1, respectively, far exceeding the corresponding adsorption value of biochar and bentonite (6.541 and 2.013 mg·g−1, respectively).The adsorption of Hg2+ on the CB was characterized using a kinetic model and an isothermal adsorption line, which revealed that the pseudo-second-order kinetic model and Langmuir isothermal model well represented the adsorption of Hg2+ on the CB, indicating that the adsorption was mainly chemical adsorption of the monolayer. Thermodynamic experiments confirmed that the adsorption process of Hg2+ by the CB was spontaneous and endothermic. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and a thermogravimetric analysis (TGA) showed that after Hg2+ was adsorbed by CB, functional groups, such as the –OH group (or C=O, COO–, C=C) on the CB, induced complexation between Hg and –O–, and part of Hg (ii) was reduced Hg (i), resulting in the formation of single or double tooth complexes of Hg–O– (or Hg–O–Hg). Therefore, the prepared composite (CB) showed potential application as an excellent adsorbent for removing heavy metal Hg2+ from polluted water compared with using any one material alone.
机译：汞（HG）污染土壤和水的修复需要不断发展有效的污染物去除技术。为了解决这个问题，使用溶液嵌入复合加热方法从局部小米秸秆和膨润土制备生物炭 - 膨润土复合物（CB），然后研究其物理和化学性质和微观术。制备的Cb和Mb（改性Biochar）分别具有11.722和9.152mg·G-1的最大吸附能力，远远超过生物炭和膨润土的相应吸附值（分别为6.541和2.013 mg·G-1） 。使用动力学模型和等温吸附线的CB上Hg2 +的吸附，表明伪二阶动力学模型和朗米尔等温模型良好地代表了Cb上的Hg2 +的吸附，表明吸附是主要是单层的化学吸附。热力学实验证实，CB的HG2 +的吸附过程是自发的和吸热的。傅里叶变换红外光谱（FTIR），X射线光电子能谱（XPS）和热重分析（TGA）显示，在Hg2 +被Cb，官能团（或C = O，COO-）吸附后在Cb上的C = C），Hg和-O-之间的诱导络合和Hg（II）的一部分降低了Hg（i），导致形成Hg-O-（或Hg的双牙复合物） -O-HG）。因此，制备的复合材料（CB）显示出潜在的应用作为除了单独使用任何一种材料的污染水中除去重金属HG2 +的优异吸附剂。

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