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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Textile dye removal from aqueous solutions using cheap MgO nanomaterials: Adsorption kinetics, isotherm studies and thermodynamics
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Textile dye removal from aqueous solutions using cheap MgO nanomaterials: Adsorption kinetics, isotherm studies and thermodynamics

机译：使用廉价的MgO纳米材料从水溶液中去除纺织品染料：吸附动力学，等温线研究和热力学

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摘要

In the present study, three MgO nanomaterials (MgOS, MgON and MgOU) were synthesized by sol-gel and two different precipitation methods, respectively, and used for the sorption of Remazol Red RB-133 from aqueous solution. The effect of parameters like contact time, initial dye concentration and temperature on the adsorption capacity was studied. The adsorption isotherm studies were carried out using Langmuir, Freundlich and Temkin models. Langmuir was the most suitable model to describe the adsorption isotherm. Pseudo- first -order model fitted well with good agreement with the experimental values of q(e) (equilibrium adsorption capacity). The complete removal efficiency of the dye on MgOS, MgON and MgOU adsorbents was attained when the contacting time was continued to 11, 40 and 60 min, respectively. Hence, the MgOS adsorbent was found to possess the highest removal efficiency of the dye from aqueous solutions. In addition, the thermodynamic parameters, Delta H degrees, Delta S degrees, Delta G degrees, and E-a were also calculated for Remazol Red RB-133 adsorption onto MgOs adsorbent. In order to reveal the adsorptive characteristic of MgO nanomaterials, XRD, HR-TEM, FT-IR and N-2 adsorption/desorption isotherms were carried out. The results showed that MgOs nanomaterial had potentially lowering capital and operational costs for practical applications. (C) 2015 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
机译：在本研究中，分别通过溶胶-凝胶法和两种不同的沉淀法合成了三种MgO纳米材料（MgOS，MgON和MgOU），并用于从水溶液中吸附Remazol Red RB-133。研究了接触时间，初始染料浓度和温度等参数对吸附容量的影响。吸附等温线研究使用Langmuir，Freundlich和Temkin模型进行。 Langmuir是描述吸附等温线的最合适模型。伪一阶模型与q（e）（平衡吸附容量）的实验值吻合得很好。当接触时间分别持续到11、40和60分钟时，染料可以完全去除MgOS，MgON和MgOU吸附剂。因此，发现MgOS吸附剂具有从水溶液中去除染料的最高效率。另外，还计算了Remazol Red RB-133吸附在MgOs吸附剂上的热力学参数Delta H度，Delta S度，Delta G度和E-a。为了揭示MgO纳米材料的吸附特性，进行了XRD，HR-TEM，FT-IR和N-2等温吸附/解吸等温线。结果表明，MgOs纳米材料潜在地降低了实际应用的资本和运营成本。 （C）2015年日本粉末技术学会。由Elsevier B.V.和日本粉末技术学会出版。版权所有。

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