A green and economical MgO/biochar composite for the removal of U(VI) from aqueous solutions
A green and economical MgO/biochar composite for the removal of U(VI) from aqueous solutions
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一种绿色经济的 MgO/生物炭复合材料，用于从水溶液中去除 U(VI)
DOI：
10.1016/j.cherd.2022.02.031
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发表时间：
2022-03-11
影响因子：
3.9
通讯作者：
Tan, Xiaoli
中科院分区：
文献类型：
--
作者：
Chen, Weiwei;Feng, Jinghua;Tan, Xiaoli
采用简便的方法合成了氧化镁/生物炭（MgO/生物炭）复合材料，与许多材料相比，MgO/生物炭具有绿色和经济的特点。在pH = 4.0、m/V = 0.2 g L-1、C-U（VI）初始值= 10 mg L-1、I = 0.01 m NaNO3、T = 298 K条件下，MgO/生物炭对U（VI）的吸附能力达到了最大吸附量514.72 mg g（-1）。采用扫描电镜（SEM）、粉末x射线衍射（XRD）、傅里叶变换红外（FTIR）对MgO/生物炭的形貌、光谱性质、化学成分等进行了系统表征。间歇实验表明，吸附过程以拟二级速率模型为主，吸附等温线符合Langmuir模型。制备的MgO/生物炭在较宽的pH范围内具有良好的U（VI）吸附性能。x射线光电子能谱（XPS）分析表明，U（VI）与MgO/生物炭表面羟基之间的相互作用对高效吸附过程有重要作用。本研究强调了MgO与生物炭优势结合的新机遇，进一步拓宽了利用环保材料从水生环境中分离污染物的新视野。(C) 2022年化学工程师学会。Elsevier Ltd.出版。版权所有。
A magnesium oxide/biochar (MgO/biochar) composite, which was green and economical compared with numerous materials, was synthesized by a facile method. And MgO/biochar performed excellent adsorption ability in the sequestration of U(VI) with the satisfied maximum adsorption capacity (514.72 mg g(-1)) at pH = 4.0, m/V = 0.2 g L-1, C-U(VI)initial = 10 mg L-1, I = 0.01 M NaNO3, T = 298 K. The morphology, spectroscopic properties, chemical composition, etc. of MgO/biochar were characterized systemically by scanning electron microscopy (SEM), powder X-ray diffraction (XRD), Fourier transform infrared (FTIR). The batch experiments showed that the adsorption process was predominated by pseudo-second-order rate model and the adsorption isotherm conformed to the Langmuir model. The prepared MgO/biochar exhibited commendable U(VI) adsorption performance in a wide pH range. Xray photoelectron spectroscopy (XPS) analysis suggested that the interactions between U(VI) and the hydroxyl groups on the surface of the MgO/biochar contribute greatly to the efficient adsorption process. This work underlines new opportunities in combining the advantages of MgO and biochar, and further broadens new horizons of separating pollutants from the aquatic environment by an environment-friendly materials. (C) 2022 Institution of Chemical Engineers. Published by Elsevier Ltd. All rights reserved.