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Sequestration of Eosin Dye by Magnesium (II)-Doped Zinc Oxide Nanoparticles: Its Kinetic, Isotherm, and Thermodynamic Studies
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-12-04 , DOI: 10.1021/acs.jced.0c00810 Saruchi 1 , Mayank Sharma 2 , Mohammad Rafe Hatshan 3 , Vaneet Kumar 4 , Ashvinder Rana 5
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-12-04 , DOI: 10.1021/acs.jced.0c00810 Saruchi 1 , Mayank Sharma 2 , Mohammad Rafe Hatshan 3 , Vaneet Kumar 4 , Ashvinder Rana 5
Affiliation
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The current work deals with the synthesis of ZnO NPs and Mg+2-doped ZnO NPs by a simple coprecipitation method. The structure and morphology of the synthesized nanoparticles were studied by Fourier transform infrared spectroscopy, field emission scanning electron microscopy (FESEM), dynamic light scattering (DLS), and X-ray diffraction. Synthesized nanoparticles are used as an adsorbent for the elimination of toxic dye and they exhibited good efficacy toward the removal of eosin dye. The experimental data were examined with different kinetic models like pseudo-first order, pseudo-second order, and intraparticle diffusion. Isotherm models Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich (D-R) were used to study the equilibrium data. Maximum dye adsorption was obtained at pH = 6, an adsorbent dose of 0.6 g, a temperature of 55 °C, an agitation speed of 150 rpm, and a dye concentration of 10 ppm. The maximum dye removal values were found to be 97.9 and 98.4% in ZnO NPs and Mg+2-doped ZnO NPs, respectively. The regeneration efficiencies were 93 and 96% in the first cycle and they were retained up to 71 and 81% after the fifth cycle in ZnO NPs and Mg+2-doped ZnO NPs, respectively. This envisaged that doping with Mg+2 improves the stability and reusability of ZnO NPs. The RL value of dye adsorption onto Mg+2-doped ZnO NPs is lower than that onto ZnO NPs. The R2 value of pseudo-second order was <0.99 and was in agreement with the experimental values of adsorption kinetics. The value of ΔG° is negative, which indicates that the dye adsorption process is spontaneous.
中文翻译：
镁（II）掺杂的氧化锌纳米粒子螯合曙红染料的动力学，等温线和热力学研究
目前的工作涉及ZnO NP和Mg +2的合成一种简单的共沉淀方法制备掺杂的ZnO NPs。通过傅立叶变换红外光谱，场发射扫描电子显微镜（FESEM），动态光散射（DLS）和X射线衍射研究了合成纳米颗粒的结构和形态。合成的纳米颗粒用作消除有毒染料的吸附剂，并且在去除曙红染料方面表现出良好的功效。用不同的动力学模型检查了实验数据，例如伪一级，伪二级和粒子内扩散。等温线模型Langmuir，Freundlich，Temkin和Dubinin–Radushkevich（DR）用于研究平衡数据。在pH = 6，吸附剂量为0.6 g，温度为55°C，搅拌速度为150 rpm和染料浓度为10 ppm的情况下，可获得最大的染料吸附。分别+2掺杂的ZnO NP。在第一个循环中，再生效率分别为93％和96％，在第五个循环后，分别在ZnO NPs和Mg +2掺杂的ZnO NPs中分别保持高达71％和81％。可以设想，掺杂Mg +2可以改善ZnO NP的稳定性和可重复使用性。染料吸附在Mg +2掺杂的ZnO NPs上的R L值低于在ZnO NPs上吸附的R L值。拟秒级的R 2值<0.99，与吸附动力学的实验值一致。Δ的值ģ °是负的，这表示该染料吸附过程是自发的。
更新日期：2021-01-14
中文翻译：
镁（II）掺杂的氧化锌纳米粒子螯合曙红染料的动力学，等温线和热力学研究
目前的工作涉及ZnO NP和Mg +2的合成一种简单的共沉淀方法制备掺杂的ZnO NPs。通过傅立叶变换红外光谱，场发射扫描电子显微镜（FESEM），动态光散射（DLS）和X射线衍射研究了合成纳米颗粒的结构和形态。合成的纳米颗粒用作消除有毒染料的吸附剂，并且在去除曙红染料方面表现出良好的功效。用不同的动力学模型检查了实验数据，例如伪一级，伪二级和粒子内扩散。等温线模型Langmuir，Freundlich，Temkin和Dubinin–Radushkevich（DR）用于研究平衡数据。在pH = 6，吸附剂量为0.6 g，温度为55°C，搅拌速度为150 rpm和染料浓度为10 ppm的情况下，可获得最大的染料吸附。分别+2掺杂的ZnO NP。在第一个循环中，再生效率分别为93％和96％，在第五个循环后，分别在ZnO NPs和Mg +2掺杂的ZnO NPs中分别保持高达71％和81％。可以设想，掺杂Mg +2可以改善ZnO NP的稳定性和可重复使用性。染料吸附在Mg +2掺杂的ZnO NPs上的R L值低于在ZnO NPs上吸附的R L值。拟秒级的R 2值<0.99，与吸附动力学的实验值一致。Δ的值ģ °是负的，这表示该染料吸附过程是自发的。
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