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A Novel Nanocomposite as an Efficient Adsorbent for the Rapid Adsorption of Ni(II) from Aqueous Solution

机译：新型纳米复合材料作为从水溶液中快速吸附Ni（II）的有效吸附剂

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A sulfhydryl-lignocellulose/montmorillonite (SLT) nanocomposite was prepared using a chemical intercalation reaction. The SLT nanocomposite was characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), and Transmission Electron Microscopy (TEM), the results demonstrated that an intercalated-exfoliated nanostructure was formed in the SLT nanocomposite. Batch experiments were conducted to optimize parameters such as SLT nanocomposite dosage, the initial concentration of Ni(II), solution pH, temperature, and time. The results indicated that the attractive adsorption capacity reached 1134.08 mg/g with 0.05 g of SLT at an initial concentration of Ni(II) of 700 mg/L, solution pH of 5.5, adsorption temperature of 50 °C, and adsorption time of 40 min, meanwhile, the Ni(II) adsorption capacity significantly decreased with the increase in ionic strength. The pseudo-second order kinetic model could describe the whole adsorption process well, and the isotherm adsorption equilibrium conformed to the Freundlich model. The adsorption mechanism of SLT was also discussed by means of FTIR and Energy-Dispersive X-Ray (EDX). Dramatically, the introduction of sulfhydryl achieves the increased activated functional groups content of SLT nanocomposite, leading to remarkably higher adsorption amount on Ni(II). The desorption capacity of SLT was dependent on parameters such as HNO3 concentration, desorption temperature, and ultrasonic desorption time. The satisfactory desorption capacity and desorption efficiency of 458.21 mg/g and 40.40% were obtained at an HNO3 concentration, desorption temperature, and ultrasonic desorption time of 0.4 mol/L, 40 °C, and 30 min, respectively. The regeneration studies showed that the adsorption capacity of SLT was consistent for four cycles without any appreciable loss and confirmed that the SLT was reusable. Owing to such outstanding features, the novel SLT nanocomposite proved the great potential in adsorption for Ni(II) removal from aqueous solution, and exhibited an extremely significant amount of Ni(II), compared to pristine lignocellulose/montmorillonite and the conventional spent adsorbents.
机译：使用化学嵌入反应制备了巯基-木质纤维素/蒙脱土（SLT）纳米复合材料。通过傅立叶变换红外光谱（FTIR），X射线衍射（XRD），扫描电子显微镜（SEM）和透射电子显微镜（TEM）对SLT纳米复合材料进行了表征，结果表明在SLT纳米复合材料中形成了嵌入剥落的纳米结构。 SLT纳米复合材料。进行批处理实验以优化参数，例如SLT纳米复合材料的剂量，Ni（II）的初始浓度，溶液的pH，温度和时间。结果表明，在初始浓度为700 mg / L的Ni（II），溶液pH为5.5，吸附温度为50°C，吸附时间为40的条件下，0.05 mg SLT的吸附容量达到1134.08 mg / g。最小，同时，随着离子强度的增加，Ni（II）的吸附能力显着下降。拟二级动力学模型可以很好地描述整个吸附过程，等温线吸附平衡符合Freundlich模型。还通过FTIR和能量色散X射线（EDX）讨论了SLT的吸附机理。引人注目的是，巯基的引入使SLT纳米复合材料的活化官能团含量增加，从而导致在Ni（II）上的吸附量显着增加。 SLT的解吸能力取决于HNO3浓度，解吸温度和超声解吸时间等参数。在0.4 mol / L，40°C和30分钟的HNO3浓度，解吸温度和超声解吸时间下，分别获得了令人满意的458.21 mg / g和40.40％的解吸容量和解吸效率。再生研究表明，SLT的吸附能力在四个循环中保持一致，没有任何明显的损失，并证实了SLT可重复使用。由于具有这些突出的特征，与原始木质纤维素/蒙脱土和传统的废吸附剂相比，新型SLT纳米复合材料在从水溶液中去除Ni（II）的吸附方面具有巨大潜力，并显示出非常大量的Ni（II）。

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