Zhang Yixuan, Cheng Yuxiao, Chen Ningning, Zhou Yuyan, Li Bingyu, Gu Wei, Shi Xinhao, Xian Yuezhong
Department of Chemistry, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China.
Shanghai Entry-Exit Inspection and Quarantine Bureau, Shanghai 200135, China.
J Colloid Interface Sci. 2014 May 1;421:85-92. doi: 10.1016/j.jcis.2014.01.022. Epub 2014 Jan 30.
Reduced graphene oxide (rGO) nanosheets decorated with tunable magnetic nanoparticles (MNPs) were synthesized by a simple co-precipitation method and employed for recyclable removal of bisphenol A (BPA) from aqueous solution. The morphological characterization shows that Fe3O4 nanoparticles are uniformly deposited on rGO sheets. The magnetic characterization demonstrates that composites with various amounts of Fe3O4 nanoparticles are superparamagnetic. Due to the superparamagnetism, rGO-MNPs were used as recyclable adsorbents for BPA removal in aqueous solution. The kinetics of the adsorption process and the adsorption isotherm were investigated. The results indicate that the adsorption process is fitted to Langmuir model and the composites with lower density of MNPs represent better adsorption ability. In addition, its kinetics follows pseudo-second-order rate equation. Moreover, the adsorbents could be recovered conveniently by magnetic separation and recyclable used because of the easy desorption of BPA.
通过简单的共沉淀法合成了负载可调控磁性纳米颗粒（MNPs）的还原氧化石墨烯（rGO）纳米片，并将其用于从水溶液中循环去除双酚A（BPA）。形态表征表明，Fe3O4纳米颗粒均匀沉积在rGO片上。磁性表征表明，含有不同含量Fe3O4纳米颗粒的复合材料具有超顺磁性。由于具有超顺磁性，rGO-MNPs被用作从水溶液中循环去除BPA的吸附剂。研究了吸附过程的动力学和吸附等温线。结果表明，吸附过程符合朗缪尔模型，MNPs密度较低的复合材料表现出更好的吸附能力。此外，其动力学遵循准二级速率方程。而且，由于BPA易于解吸，吸附剂可通过磁分离方便地回收并循环使用。
