还原氧化石墨烯吸附剂吸附二元混合物中的铅(II)和铬(VI)离子的合成、表征和模型建立

IF 3.3 4区 物理与天体物理 Q2 CHEMISTRY, PHYSICAL
Amina Kanwal, Tayyaba Shahzadi, Tauheeda Riaz, Maria Zaib
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引用次数: 0

摘要

石墨烯及其衍生物作为多功能催化剂,因其卓越的潜力而备受青睐。在此,我们以还原氧化石墨烯(rGO)为载体,合成了铜/镍@rGO 纳米复合材料。在其表面嵌入了铜和镍的纳米颗粒(NPs)混合物,用于吸附二元混合物中的重金属离子,即 Pb2+ 和 Cr6+。纳米复合材料的合成过程由紫外-可见光谱监测。傅立叶变换红外光谱分析确认了参与纳米复合材料合成和稳定的官能团。通过 XRD 光谱计算,纳米复合材料的平均粒径为 26 nm。SEM 分析显示了纳米复合材料的线状结构,而 EDX 则提供了有关元素组成的信息。在钨灯和无钨灯条件下,用合成材料去除二元混合物中的阳离子(Pb2+ 和 Cr6+)。在钨灯下,当二元混合物中的阳离子浓度为百万分之 5 时,10 毫克吸附剂在 45 °C 温度下作用 40 分钟后,94% 的阳离子被高效去除。热力学研究表明,阳离子与纳米催化剂的反应是自发和放热性质的。对实验值采用了动力学模型,假二阶的回归系数(R2)接近统一值(0.99),被认为是吸附的最佳拟合方法。在吸附等温线中,拟合效果最好的模型是 Freundlich 等温线,因为其 R2 值(0.97)接近统一。对这些吸附等温线也进行了误差分析,以获得精确的结果。通过解吸过程对材料的可重复使用性进行了 5 次分析,证实了其稳定性和更高的催化效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Synthesis, Characterization, and Modeling of Reduced Graphene Oxide Supported Adsorbent for Sorption of Pb(II) and Cr(VI) Ions from Binary Mixture

Synthesis, Characterization, and Modeling of Reduced Graphene Oxide Supported Adsorbent for Sorption of Pb(II) and Cr(VI) Ions from Binary Mixture

Graphene and its derivatives as multifunctional catalysts are in high demand, owing to their exceptional potential. Here, we synthesized Cu/Ni@rGO nanocomposite by using reduced graphene oxide (rGO) as a support which provided large surface area. A mixture of Cu and Ni nanoparticles (NPs) was embedded on its surface for sorption of heavy metal ions, i.e., Pb2+ and Cr6+, from binary mixture. Synthesis process of nanocomposite was monitored by UV-visible spectroscopy. FTIR analysis was performed to confirm the functional groups involved in synthesis and stabilization of the nanocomposite. The average size of nanocomposite was 26 nm calculated by XRD spectroscopy. SEM analysis revealed the thread-like structure of nanocomposite, while EDX gave information about elemental composition. Synthesized material was used to remove cations (Pb2+ and Cr6+) from binary mixture under tungsten lamp and without tungsten lamp. Under tungsten lamp, at 5 ppm concentration of binary mixture of cations, after 40 min of interaction with 10 mg adsorbent dosage at 45 °C temperature, 94% of cations was removed very efficiently. Thermodynamics studies showed that reaction of cations with nanocatalyst was spontaneous and exothermic in nature. Kinetics models were employed on experimental values and regression coefficient (R2) was near to unity (0.99) for pseudo 2nd order, which was considered the best fitted method for adsorption. Among sorption isotherms, the best fitted model was Freundlich isotherm as its R2 value (0.97) is near to unity. On these adsorption isotherms, error analysis was also applied to attain precision on results. Reusability of material was analyzed 5 times by desorption process which confirmed its stability and higher catalytic efficiency.

Graphical Abstract

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来源期刊
Plasmonics
Plasmonics 工程技术-材料科学:综合
CiteScore
5.90
自引率
6.70%
发文量
164
审稿时长
2.1 months
期刊介绍: Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons. Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.
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