A novel method to produce composite sorbent material compromising porous diatomaceous earth (DE) and surface functionalized amorphous MnO2 is reported. Via a simple in situ redox reaction over the carbonized DE powders, a uniform layer of amorphous MnO2 was anchored onto the DE surface. The hybrid adsorbent was characterized by X-ray diffraction, scanning electron microscopy, and infrared spectroscopy. The batch method has been employed to investigate the effects of surface coating on adsorption performance of DE. According to the equilibrium studies, the adsorption capacity of DE for adsorbing lead ions after MnO2 modification increased more than six times. And the adsorption of Pb2+ on the MnO2 surface is based on ion-exchange mechanism. The developed strategy presents a novel opportunity to prepare composite adsorbent materials by integrating nanocrystals with porous matrix.

中文翻译：

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无定形氧化锰对硅藻土的均匀表面改性及其对铅离子的吸附特性

报道了一种生产复合吸附剂材料的新方法，该吸附剂材料包括多孔硅藻土 (DE) 和表面功能化的无定形 MnO2。通过在碳化 DE 粉末上进行简单的原位氧化还原反应，均匀的无定形 MnO2 层被固定在 DE 表面。通过 X 射线衍射、扫描电子显微镜和红外光谱对混合吸附剂进行了表征。已采用批量方法研究表面涂层对 DE 吸附性能的影响。根据平衡研究，经过MnO2改性后DE吸附铅离子的吸附能力增加了6倍以上。Pb2+ 在 MnO2 表面的吸附是基于离子交换机制。