Food Engineering Department, CSIR-Central Food Technological Research Institute, Mysore, India; Academy of Scientific and Innovative Research, New Delhi, India.
Carbohydr Polym. 2017 Jul 15;168:129-137. doi: 10.1016/j.carbpol.2017.03.045. Epub 2017 Mar 16.
Beta-cyclodextrin capped Graphene-magnetite (G-FeO-BCD) nanocomposite was synthesized by ethylenediamine conjugation and used as an adsorbent for selective removal of Bisphenol-A (BPA) in water. Characterization of nanocomposite revealed BCD conjugated to FeO nanoparticles (30-40nm) embedded on graphene. Adsorption process followed Langmuir model and pseudo second order kinetics with an adsorption capacity of 59.6mg/g. It was found to be highly favourable physisorption and endothermic process as indicated by ΔG° (-3.36kJ/mol) and ΔH° (2.08kJ/mol) values at ambient temperatures. The nanocomposite was highly specific towards BPA compared to its analogs, largely driven by host-guest interaction between BCD and BPA. Nanocomposite had a high magnetization of 97emu/g with superparamagnetic property at room temperature which helps in faster separation using an external magnetic field. Nanocomposite can be regenerated with methanol and can be reused without much loss in adsorption efficiency (<10%) after 6 cycles. It has huge potential and application in selective adsorption of target molecules.
β-环糊精包覆的石墨烯-磁铁矿（G-FeO-BCD）纳米复合材料通过乙二胺偶联合成，用作水相中双酚 A（BPA）的选择性吸附剂。纳米复合材料的表征揭示了 BCD 接枝到嵌入在石墨烯上的 FeO 纳米颗粒（30-40nm）上。吸附过程遵循 Langmuir 模型和准二级动力学，吸附容量为 59.6mg/g。研究表明，在环境温度下，ΔG°（-3.36kJ/mol）和ΔH°（2.08kJ/mol）的值表明该吸附过程是高度有利的物理吸附和吸热过程。与类似物相比，该纳米复合材料对 BPA 具有高度的特异性，这主要是由 BCD 和 BPA 之间的主体-客体相互作用驱动的。该纳米复合材料在室温下具有 97emu/g 的高磁化强度和超顺磁性，有助于在外磁场作用下更快地分离。纳米复合材料可以用甲醇再生，并且在 6 次循环后，吸附效率（<10%）几乎没有损失，可以重复使用。它在目标分子的选择性吸附方面具有巨大的潜力和应用前景。
