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Surface-Charge-Controlled Synthesis of ZnIn2S4 Nanosheet-Based Materials for Selective Adsorption of Organic Dyes
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-04-06 , DOI: 10.1021/acsanm.1c00409 Afaq Ahmad Khan 1 , Aniruddha Molla 1 , Arif Chowdhury 1 , Sunita Kumari 1 , Sahid Hussain 1
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-04-06 , DOI: 10.1021/acsanm.1c00409 Afaq Ahmad Khan 1 , Aniruddha Molla 1 , Arif Chowdhury 1 , Sunita Kumari 1 , Sahid Hussain 1
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In recent years, controlling and manipulating the materials’ surface charges have gained significant attention because of efficient application in various fields such as catalysis, dye adsorption, chromatography, etc. In this study, we have controlled the surface charge of ZnIn2S4 nanomaterials (NMs) by loading Zn2+ ions on the surface of materials. The ζ-potential studies revealed that the average surface charge of the NMs was successfully controlled from −30.3 to +31.4 mV. The X-ray diffraction patterns suggested that the phase of the NMs is changed from hexagonal ZnIn2S4 to cubic ZnIn2S4 with slight trigonal ZnS moieties. Further, the electron microscopy results displayed that the morphology of the NMs gradually changed from a sheetlike structure to a hybrid of sphere/petals and finally a very small flakelike structure with an increasing loading concentration of Zn2+ ions. Moreover, the nanosheet micrograph showed the different numbers of sheet layers, which are composed of 2–6 layers. The Brunauer–Emmett–Teller analysis indicated that the specific surface area is increased from 48.2 to 118.6 m2 g–1 after the loading of Zn2+ ions. The obtained NMs displayed a high adsorption selectivity performance for organic dyes. A separation factor (α21) of 95% was obtained for anionic Congo red (CR) over positively charged nanoflakes and 85% for cationic methylene blue (MB) dyes on negatively charged nanosheet. The as-prepared nanosheet and nanoflakes also showed efficient adsorption behavior toward two different kinds of antibiotics such as tetracycline and ciprofloxacin. The adsorption process followed the Langmuir isotherm model for the MB, CR, and ciprofloxacin, whereas tetracycline adsorption obeyed the Freundlich isotherm model. The adsorbents displayed a pseudo-second-order rate kinetic model. The recyclability of the best adsorbents was found up to five times without significant loss of removal efficiency.
中文翻译：
ZnIn 2 S 4纳米片基材料的表面电荷控制合成用于有机染料的选择性吸附
近年来，由于在催化，染料吸附，色谱等各个领域的有效应用，控制和操纵材料的表面电荷受到了广泛关注。在本研究中，我们控制了ZnIn 2 S 4纳米材料的表面电荷。（NMs）通过在材料表面上加载Zn 2+离子来实现。ζ电位研究表明，NMs的平均表面电荷已成功控制在-30.3至+31.4 mV之间。X射线衍射图表明NMs的相从六方ZnIn 2 S 4变为立方ZnIn 2 S 4带有轻微的三角形ZnS部分。此外，电子显微镜结果显示，NMs的形态逐渐从片状结构变为球形/花瓣的杂物，最后变成非常小的片状结构，并增加了Zn 2+离子的负载浓度。此外，纳米片显微照片显示出不同数量的片层，这些片层由2至6层组成。Brunauer-Emmett-Teller分析表明，负载Zn 2+离子后，比表面积从48.2增加到118.6 m 2 g –1。所得的NMs显示出对有机染料的高吸附选择性性能。分离系数（α 2 1在带正电的纳米薄片上，阴离子刚果红（CR）的收率为95％），而在带负电的纳米片材上获得的阳离子亚甲基蓝（MB）染料的回收率为85％。所制备的纳米片和纳米片还显示出对两种不同种类的抗生素（例如四环素和环丙沙星）的有效吸附行为。MB，CR和环丙沙星的吸附过程遵循Langmuir等温模型，而四环素吸附遵循Freundlich等温模型。吸附剂显示出伪二级速率动力学模型。发现最佳吸附剂的可回收性高达五倍，而去除效率没有明显损失。
更新日期：2021-04-23
中文翻译：
ZnIn 2 S 4纳米片基材料的表面电荷控制合成用于有机染料的选择性吸附
近年来，由于在催化，染料吸附，色谱等各个领域的有效应用，控制和操纵材料的表面电荷受到了广泛关注。在本研究中，我们控制了ZnIn 2 S 4纳米材料的表面电荷。（NMs）通过在材料表面上加载Zn 2+离子来实现。ζ电位研究表明，NMs的平均表面电荷已成功控制在-30.3至+31.4 mV之间。X射线衍射图表明NMs的相从六方ZnIn 2 S 4变为立方ZnIn 2 S 4带有轻微的三角形ZnS部分。此外，电子显微镜结果显示，NMs的形态逐渐从片状结构变为球形/花瓣的杂物，最后变成非常小的片状结构，并增加了Zn 2+离子的负载浓度。此外，纳米片显微照片显示出不同数量的片层，这些片层由2至6层组成。Brunauer-Emmett-Teller分析表明，负载Zn 2+离子后，比表面积从48.2增加到118.6 m 2 g –1。所得的NMs显示出对有机染料的高吸附选择性性能。分离系数（α 2 1在带正电的纳米薄片上，阴离子刚果红（CR）的收率为95％），而在带负电的纳米片材上获得的阳离子亚甲基蓝（MB）染料的回收率为85％。所制备的纳米片和纳米片还显示出对两种不同种类的抗生素（例如四环素和环丙沙星）的有效吸附行为。MB，CR和环丙沙星的吸附过程遵循Langmuir等温模型，而四环素吸附遵循Freundlich等温模型。吸附剂显示出伪二级速率动力学模型。发现最佳吸附剂的可回收性高达五倍，而去除效率没有明显损失。
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