Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University , Nanchang, Jiangxi 330063, P. R. China.
Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100864, P. R. China.
ACS Appl Mater Interfaces. 2016 Jul 20;8(28):18140-9. doi: 10.1021/acsami.6b05895. Epub 2016 Jul 6.
Highly porous, three-dimensional (3D) nanostructured composite adsorbents of reduced graphene oxides/Mn3O4 (RGO/Mn3O4) were fabricated by a facile method of a combination of reflux condensation and solvothermal reactions and systemically characterized. The as-prepared RGO/Mn3O4 possesses a mesoporous 3D structure, in which Mn3O4 nanoparticles are uniformly deposited on the surface of the reduced graphene oxide. The adsorption properties of RGO/Mn3O4 to antimonite (Sb(III)) and antimonate (Sb(V)) were investigated using batch experiments of adsorption isotherms and kinetics. Experimental results show that the RGO/Mn3O4 composite has fast liquid transport and superior adsorption capacity toward antimony (Sb) species in comparison to six recent adsorbents reported in the literature and summarized in a table in this paper. Theoretical maximum adsorption capacities of RGO/Mn3O4 toward Sb(III) and Sb(V) are 151.84 and 105.50 mg/g, respectively, modeled by Langmuir isotherms. The application of RGO/Mn3O4 was demonstrated by using drinking water spiked with Sb (320 μg/L). Fixed-bed column adsorption experiments indicate that the effective breakthrough volumes were 859 and 633 mL bed volumes (BVs) for the Sb(III) and Sb(V), respectively, until the maximum contaminant level of 5 ppb was reached, which is below the maximum limits allowed in drinking water according to the most stringent regulations. The advantages of being nontoxic, highly stable, and resistant to acid and alkali and having high adsorption capacity toward Sb(III) and Sb(V) confirm the great potential application of RGO/Mn3O4 in Sb-spiked water treatment.
高度多孔的三维（3D）纳米结构复合吸附剂还原氧化石墨烯/ Mn3O4（RGO/Mn3O4）是通过回流冷凝和溶剂热反应相结合的简便方法制备的，并进行了系统的表征。所制备的 RGO/Mn3O4具有介孔 3D 结构，其中 Mn3O4 纳米颗粒均匀地沉积在还原氧化石墨烯的表面上。通过吸附等温线和动力学的批量实验研究了 RGO/Mn3O4 对 Sb（III）和 Sb（V）的吸附性能。实验结果表明，与文献中报道的六种最近的吸附剂并在本文中的一个表格中总结的相比，RGO/Mn3O4 复合材料具有快速的液体传输和对 Sb 物种的优越吸附能力。RGO/Mn3O4 对 Sb（III）和 Sb（V）的理论最大吸附容量分别为 151.84 和 105.50mg/g，通过 Langmuir 等温线进行建模。RGO/Mn3O4 的应用通过使用含 Sb（320μg/L）的饮用水进行了证明。固定床柱吸附实验表明，Sb（III）和 Sb（V）的有效穿透体积分别为 859 和 633 mL 床体积（BV），直到达到 5ppb 的最大污染物水平，这低于最严格法规规定的饮用水允许的最大限值。RGO/Mn3O4 对 Sb（III）和 Sb（V）具有高吸附容量、无毒、高度稳定、耐酸碱性等优点，证实了其在 Sb 污染水治理中的巨大潜在应用。
