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通过分级MoS/SH-MWCNT纳米复合材料从工业矿井水中高效去除Pb(II)和Cd(II)

Efficient Removal of Pb(II) and Cd(II) from Industrial Mine Water by a Hierarchical MoS/SH-MWCNT Nanocomposite.

作者信息

Gusain Rashi, Kumar Neeraj, Fosso-Kankeu Elvis, Ray Suprakas Sinha

机构信息

DST-CSIR National Centre for Nanostructured Materials, Council for Scientific and Industrial Research, Pretoria 0001, South Africa.

Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa.

出版信息

ACS Omega. 2019 Aug 14;4(9):13922-13935. doi: 10.1021/acsomega.9b01603. eCollection 2019 Aug 27.

DOI:10.1021/acsomega.9b01603
PMID:31497710
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6714537/
Abstract

In this study, we investigate the adsorption capability of molybdenum sulfide (MoS)/thiol-functionalized multiwalled carbon nanotube (SH-MWCNT) nanocomposite for rapid and efficient removal of heavy metals [Pb(II) and Cd(II)] from industrial mine water. The MoS/SH-MWCNT nanocomposite was synthesized by acid treatment and sulfurization of MWCNTs followed by a facile hydrothermal reaction technique using sodium molybdate and diethyldithiocarbamate as MoS precursors. Morphological and chemical features of the nanocomposite material were studied using various characterization techniques. Furthermore, the effects of adsorbent (MoS/SH-MWCNT nanocomposite) concentration, contact time, initial concentration of heavy-metal ions, and reaction temperature were examined to determine the efficiency of the adsorption process in batch adsorption experiments. Kinetics and isotherm studies showed that the adsorption process followed pseudo-second-order and Freundlich adsorption isotherm models, respectively. Thermodynamic parameters calculated using van't Hoff plots show the spontaneity and endothermic nature of adsorption. MoS/SH-MWCNT nanocomposite demonstrates a high adsorption capacity for Pb(II) (90.0 mg g) and Cd(II) (66.6 mg g) following ion-exchange and electrostatic interactions. Metal-sulfur complex formation was identified as the key contributor for adsorption of heavy-metal ions followed by electrostatic interactions for multilayer adsorption. Transformation of adsorbent into PbMoO S and CdMoO S complex because of the adsorption process was confirmed by X-ray diffraction and scanning electron microscopy-energy-dispersive spectrometry. The spent adsorbent can further be used for photocatalytic and electrochemical applications; therefore, the generated secondary byproducts can also be employed for other purposes.

摘要

在本研究中，我们研究了硫化钼（MoS）/硫醇功能化多壁碳纳米管（SH-MWCNT）纳米复合材料从工业矿井水中快速高效去除重金属[Pb（II）和Cd（II）]的吸附能力。通过对多壁碳纳米管进行酸处理和硫化，然后使用钼酸钠和二乙基二硫代氨基甲酸盐作为MoS前驱体，采用简便的水热反应技术合成了MoS/SH-MWCNT纳米复合材料。使用各种表征技术研究了纳米复合材料的形态和化学特征。此外，在批量吸附实验中，考察了吸附剂（MoS/SH-MWCNT纳米复合材料）浓度、接触时间、重金属离子初始浓度和反应温度对吸附过程效率的影响。动力学和等温线研究表明，吸附过程分别遵循准二级和Freundlich吸附等温线模型。使用范特霍夫图计算的热力学参数表明吸附具有自发性和吸热性质。MoS/SH-MWCNT纳米复合材料通过离子交换和静电相互作用对Pb（II）（90.0 mg/g）和Cd（II）（66.6 mg/g）表现出高吸附容量。金属-硫络合物的形成被确定为重金属离子吸附的关键因素，随后是用于多层吸附的静电相互作用。通过X射线衍射和扫描电子显微镜-能量色散光谱证实了由于吸附过程吸附剂转变为PbMoO₄和CdMoO₄络合物。用过的吸附剂可进一步用于光催化和电化学应用；因此，产生的二次副产物也可用于其他目的。

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本文引用的文献

[1]
Accumulation of Heavy Metals from Battery Waste in Topsoil, Surface Water, and Garden Grown Maize at Omilende Area, Olodo, Nigeria.

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Achieving Controllable MoS Nanostructures with Increased Interlayer Spacing for Efficient Removal of Pb(II) from Aquatic Systems.

ACS Appl Mater Interfaces. 2019-5-29

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