Environmental Materials Division, National Environmental Engineering Research Institute, Nagpur (M.S.), India.
J Hazard Mater. 2012 Oct 30;237-238:161-9. doi: 10.1016/j.jhazmat.2012.08.023. Epub 2012 Aug 23.
A new alumina supported carbon composite material called "Eggshell Composite" (EC) was synthesized from eggshell waste as calcium source for selective fluoride adsorption from water. The effect of various synthesis parameters like eggshell (ES): Eggshell membrane (ESM) ratio, aluminium loading, mixing time and calcinations temperature to optimize the synthesis conditions for selective fluoride removal has been studied. It was observed that the synthesis parameters have significant influence on development of EC and in turn on fluoride removal capacity. EC synthesized was characterized for elemental composition, morphology, functionality and textural properties. Results showed that EC obtained from eggshell modified with alumina precursor is more selective and efficient for fluoride removal. Langmuir and Freundlich isotherm were used to obtain ultimate fluoride removal capacity. The calcium and alumina species in EC shows synergistic effect in fluoride adsorption process. Fluoride sorption studies were carried out in synthetic, groundwater and wastewater. EC proved to be a potential, indigenous and economic adsorbent for fluoride removal.
一种名为“蛋壳复合材料”（EC）的新型氧化铝负载碳复合材料，是由蛋壳废物作为钙源合成的，用于从水中选择性吸附氟化物。研究了各种合成参数（如蛋壳（ES）与蛋壳膜（ESM）的比例、铝负载量、混合时间和煅烧温度）对优化选择性去除氟化物的合成条件的影响。结果表明，合成参数对 EC 的形成及其去除氟化物的能力有显著影响。对 EC 进行了元素组成、形貌、功能和结构特性的表征。结果表明，用氧化铝前体制备的改性蛋壳合成的 EC 对氟化物的去除具有更高的选择性和效率。采用 Langmuir 和 Freundlich 等温线模型获得了 EC 的最大氟去除容量。EC 中钙和氧化铝物种在氟化物吸附过程中表现出协同效应。在合成水、地下水和废水中进行了氟化物吸附研究。EC 被证明是一种具有去除氟化物潜力、本土性和经济性的吸附剂。
