| 硅藻土原位负载网状纳米结构硅酸镁及其对Cr(Ⅵ)吸附性能 | |
| In-Situ Growing NanostructuIn-Situ Growing Nanostructured Magnesium Silicate on Diatomite: Adsorption Properties of Cr(Ⅵ) | |
| 摘要: 采用MgCl2·6H2O作为镁源，NH3·H2O作为沉淀剂，十六烷基三甲基溴化铵（CTAB）作为模板剂，以水热法在硅藻土表面原位生长纳米花状Mg（OH）2，随反应时间增加，转变成单斜晶系网状结构Mg3Si4O10（OH）2纳米花。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、氮气吸附-脱附测试、傅里叶红外光谱（FT-IR）、X射线光电子能谱（XPS）等测试手段对样品进行了表征，结果显示：反应时间为0.5~2.0 h时硅藻土表面以生长Mg（OH）2为主，样品的比表面积为180 m2·g-1；反应时间至3 h时，硅藻土表面Mg（OH）2转化成网状结构Mg3Si4O10（OH）2，样品比表面积增大到350 m2·g-1，此复合结构对Cr（Ⅵ）最大吸附量可达570 mg·g-1。 | |
| 关键词: 纳米结构 复合吸附剂 硅藻土 硅酸镁 吸附 | |
| 基金项目: 国家重点研发计划项目（No.2017YFB0310804）资助。 | |
| Abstract: The nanostructured Mg3Si4O10(OH)2 in situ grown on diatomite were first synthesized via a hydrothermal route. Moreover, Mg(OH)2 nanoflowers were first grown on the surface of diatomite after hydrothermal treatment for 0.5~2 h, these nanoflowers obtained the surface areas of 180 m2·g-1. As the hydrothermal reaction time increasing to 3 h, the Mg(OH)2 nanoflowers were completely transformed to lattice-like structure Mg3Si4O10(OH)2 which possessed the higher surface area of 350 m2·g-1. Mg3Si4O10(OH)2/diatomite composite structure showed a well adsorption performance of 570 mg·g-1 for Cr(Ⅵ). It is firmly believed that the adsorbent has a great significance of removing heavy metal ions in wastewater. | |
| Keywords: nanostructure composite adsorption materials diatomite silicate magnesium adsorption | |
| 投稿时间：2018-11-24 修订日期：2019-02-22 | |
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| 靳翠鑫,杜玉成,吴俊书,牛炎,王学凯,李杨.硅藻土原位负载网状纳米结构硅酸镁及其对Cr(Ⅵ)吸附性能[J].无机化学学报,2019,35(4):621-628. | |
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