Synthetic Metals ( IF 4.4 ) Pub Date : 2021-01-13 , DOI: 10.1016/j.synthmet.2020.116691 Lakshmi Prasanna Lingamdinne , Suhyun Lee , Yoon-Young Chang , Janardhan Reddy Koduru , Jae-Kyu Yang
Lanthanum hydroxide nanoparticles doped graphene oxide (GO-La(OH)3) was facile synthesized by sol–gel process and analyzed by spectroscopy and microscopy techniques including Fourier transform infrared (FT-IR), X-ray photoelectron (XPS), X-ray diffraction (XRD) spectroscopy and scanning electron microscopy equipped with energy-dispersive X-ray (SEM-EDX) spectroscopy. The prepared material exhibited high adsorption capacities of 78.82 and 71.42 mg g−1 for U(VI) and Pb(II), respectively. Batch studies confirmed that the adsorption was altered when conditions such as aqueous solution pH, dosage, and system temperature were varied, which indicates that the adsorption process comprises of chemical surface complexation. Further, it was conferred from the 2-pKa diffusion model fitting was well explained the adsorption process. The main and novel observations from the doping of GO surface with La can be termed as La-composites (such as La oxide and La(OH)3) are the alteration of the GO adsorption efficiency, enhancing of adsorbent separation rate from the aqueous solutions, and increases stability of the composite. In addition, the adsorption capacity was increased with the reaction temperature. The overall results have been indicating that the simple preparation of material having easy recovery and reliable adsorption efficiency for radioactive and heavy metals treatment applications.
中文翻译:
轻松合成氢氧化镧掺杂的氧化石墨烯,用于清除水中的放射性和重元素
溶胶-凝胶法可轻松合成氢氧化镧纳米颗粒掺杂的氧化石墨烯(GO-La(OH)3),并通过光谱和显微镜技术进行分析,包括傅里叶变换红外(FT-IR),X射线光电子(XPS),X-射线衍射(XRD)光谱和配有能量色散X射线(SEM-EDX)光谱的扫描电子显微镜。所制备的材料表现出78.82和71.42mg g -1的高吸附容量。分别用于U(VI)和Pb(II)。批处理研究证实,当改变水溶液的pH,剂量和系统温度等条件时,吸附会发生变化,这表明吸附过程包括化学表面络合。此外,从2-pKa扩散模型得出的拟合结果很好地解释了吸附过程。从La掺杂GO表面得到的主要和新颖的观察结果可以称为La复合物(例如La氧化物和La(OH)3)是GO吸附效率的改变,提高了吸附剂从水溶液中的分离率,并增加了复合材料的稳定性。另外,吸附容量随反应温度而增加。总体结果表明,对于放射性和重金属处理应用而言,简单制备的材料具有易于回收和可靠的吸附效率。