College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.
Bioresour Technol. 2019 Mar;276:127-132. doi: 10.1016/j.biortech.2018.12.114. Epub 2018 Dec 31.
In this study, the bamboo biomass loaded with ethylenediaminetetraacetic acid (EDTA) intercalated Mg/Al-layered double hydroxides (LDH) was calcined to obtain a novel nano-adsorbent (BC@EDTA-LDH), and BC@EDTA-LDH was used to remove hexavalent chromium (Cr(VI)) in aqueous solutions. The results showed that the interaction between LDH and Cr(VI) on biochar played a dominant part in adsorption. The LDH of Cr(VI) intercalation was successfully reconstructed after adsorption. Fourier transform infrared spectra and X-ray diffraction results confirmed the reconstruction of Mg/Al-LDH. LDH had sustained release effect on the solution. As the pH values increased, the electrostatic repulsion between CrO and OH increased, and there existed competition for adsorption sites. The maximum adsorption capacity of Cr(VI) was 38 mg/g. The data was well-fitted with pseudo second-order model and Langmuir-Freundlich model. BC@EDTA-LDH showed a high adsorption capacity and was potentially suitable for removing heavy metals in wastewater.
在这项研究中，负载乙二胺四乙酸（EDTA）插层镁/铝层状双氢氧化物（LDH）的竹生物质被煅烧以获得一种新型纳米吸附剂（BC@EDTA-LDH），并将 BC@EDTA-LDH 用于去除水溶液中的六价铬（Cr(VI)）。结果表明，生物炭上 LDH 与 Cr(VI)之间的相互作用在吸附中起主导作用。吸附后成功重建了 LDH 中的 Cr(VI)插层。傅里叶变换红外光谱和 X 射线衍射结果证实了 Mg/Al-LDH 的重建。LDH 对溶液具有持续释放作用。随着 pH 值的增加，CrO 和 OH 之间的静电排斥增加，并且存在对吸附位点的竞争。Cr(VI)的最大吸附容量为 38mg/g。数据很好地符合准二级模型和 Langmuir-Freundlich 模型。BC@EDTA-LDH 表现出高吸附容量，很可能适合用于去除废水中的重金属。
