Le Thu Dieu, Tran Luyen Thi, Dang Hue Thi Minh, Tran Thi Thu Huyen, Tran Hoang Vinh
School of Chemical Engineering, Hanoi University of Science and Technology, 1 Dai Co Viet Road, Hanoi, Vietnam.
J Anal Methods Chem. 2021 Mar 9;2021:6670913. doi: 10.1155/2021/6670913. eCollection 2021.
In this work, an effective nanocomposite-based adsorbent directed to adsorb cobalt (Co) ion was successfully synthesized from graphene oxide (GO), polyvinyl alcohol (PVA), and magnetite (FeO) nanoparticles via a coprecipitation technique. The synthesized GO/PVA/FeO nanocomposite was applied for Co ion removal with the optimized working conditions including 100 min of contact time, 0.01 g of adsorbent dosage, pH of 5.2, and 50°C of temperature. The investigation of adsorption kinetics showed that the adsorption of Co ion onto the GO/PVA/FeO nanocomposite followed the pseudo-second-order kinetic model with the rate constant k being 0.0026 (g mg·min). The Langmuir model is suitable to describe the adsorption of Co ion onto the GO/PVA/FeO nanocomposite with the maximum sorption capacity ( ) reaching 373.37 mg·g. The obtained results also indicated that the GO/PVA/FeO nanocomposite can adsorb/regenerate for at least 5 cycles with a little reduction in removal efficiency. Therefore, we believe that the GO/PVA/FeO nanocomposite could be used as a potential adsorbent for heavy metal treatment in terms of high adsorption capacity, fast adsorption rate, and recyclability.
在这项工作中，通过共沉淀技术成功地从氧化石墨烯（GO）、聚乙烯醇（PVA）和磁铁矿（FeO）纳米颗粒合成了一种用于吸附钴（Co）离子的高效纳米复合吸附剂。合成的GO/PVA/FeO纳米复合材料用于去除Co离子，优化的工作条件包括接触时间100分钟、吸附剂用量0.01克、pH值5.2和温度50°C。吸附动力学研究表明，Co离子在GO/PVA/FeO纳米复合材料上的吸附遵循准二级动力学模型，速率常数k为0.0026（g·mg⁻¹·min⁻¹）。Langmuir模型适用于描述Co离子在GO/PVA/FeO纳米复合材料上的吸附，最大吸附容量（ ）达到373.37 mg·g⁻¹。所得结果还表明，GO/PVA/FeO纳米复合材料可以吸附/再生至少5个循环，去除效率略有降低。因此，我们认为GO/PVA/FeO纳米复合材料因其高吸附容量、快速吸附速率和可回收性，可作为重金属处理的潜在吸附剂。
