Interdisciplinary Centre for Water Research (ICWaR), Indian Institute of Science, Bangalore, 56001, India.
Department of Materials Engineering, Indian Institute of Science, Bangalore, 56001, India.
Chemosphere. 2022 Aug;301:134714. doi: 10.1016/j.chemosphere.2022.134714. Epub 2022 Apr 27.
A novel green nanocomposite has been prepared by immobilizing CaO nanoparticles (CaO NPs) on the surface of graphene oxide. Biogenic CaO-NPs were synthesized from Lala clamshells. Morphological and structural characterizations of the nanocomposite were studied extensively. The adsorption capacity (q) of the nanocomposite for removing Cr(VI) was 38.04 mg g. In addition to this, the adsorption data were adequately simulated with Langmuir, Freundlich, Temkin, and pseudo-second-order models, suggesting that the adsorption process was the combination of external mass transfer and chemisorption. Electrostatic interaction was the dominant mechanism for Cr(VI) removal. In addition, the synthesized nanocomposites also serve as an excellent sensor for Cr(VI) sensing, with a limit of detection (LOD) of 0.02 μM utilizing electrochemical methods. Therefore, this green nanocomposite can simultaneously serve as an adsorbent and sensor for Cr(VI)removal from aqueous solutions.
一种新型绿色纳米复合材料通过将氧化钙纳米颗粒（CaO NPs）固定在氧化石墨烯表面而制备。生物成因的 CaO-NPs 是从拉拉贝壳中合成的。对纳米复合材料的形貌和结构进行了广泛的表征。纳米复合材料对 Cr(VI)的吸附容量（q）为 38.04mg/g。此外，吸附数据与 Langmuir、Freundlich、Temkin 和准二级模型进行了充分模拟，表明吸附过程是外扩散和化学吸附的结合。静电相互作用是去除 Cr(VI)的主要机制。此外，合成的纳米复合材料还可用作 Cr(VI)传感的优异传感器，利用电化学方法检测 Cr(VI)的检测限（LOD）为 0.02 μM。因此，这种绿色纳米复合材料可以同时用作吸附剂和传感器，从水溶液中去除 Cr(VI)。
