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首页> 外文期刊>RSC Advances >Synthesis and characterization of MCM-49/MCM-41 composite molecular sieve: an effective adsorbent for chromate from water
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Synthesis and characterization of MCM-49/MCM-41 composite molecular sieve: an effective adsorbent for chromate from water

机译：MCM-49 / MCM-41复合分子筛的合成与表征：从水中铬酸盐的有效吸附剂

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摘要

In this work a porous material, an MCM-49/MCM-41 composite molecular sieve, was synthesized via a microwave assisted hydrothermal process and characterized to observe its optimal properties for heavy metal chromate removal. The adsorption properties of chromate onto MCM-49/MCM-41 and the factors that influence its adsorption, such as chromate concentration and contact time, were investigated. It was found that MCM-49/MCM-41 is micro/mesoporous with a surface area of 372 m(2) g(-1) and average pore size of 2.9 nm. The adsorption capacity of MCM-49/MCM-41 was as high as 4.10 mg g(-1) for chromate at a temperature of 298 K, when the initial concentration of chromate was 50 mg L-1. The adsorption isotherm data of chromate fit well with both Freundlich and Langmuir adsorption isotherm models and the adsorption kinetics was well fitted using a pseudo-second order kinetic model. Thermodynamic parameters such as the standard Gibbs free energy (Delta G), enthalpy change (Delta H) and standard entropy change (Delta S) were also evaluated. Thermodynamic analysis indicates that the adsorption of chromate onto MCM-49/MCM-41 is a spontaneous and exothermic process. These results suggest that MCM-49/MCM-41 could serve as a promising adsorbent for potential applications in the removal of chromate from wastewater.
机译：在这作用中，通过微波辅助水热法合成多孔材料，一种MCM-49 / MCM-41复合分子筛，并表征了其对重金属铬酸盐除去的最佳性能。研究了Chromate对MCM-49 / MCM-41的吸附性能以及影响其吸附的因素，例如铬酸盐浓度和接触时间。发现MCM-49 / MCM-41是微/介孔的表面积372m（2）g（-1）和平均孔径为2.9nm。当铬酸盐的初始浓度为50mg L-1时，MCM-49 / MCM-41的吸附容量高达4.10mg g（-1），在298k的温度下铬酸盐。铬酸盐的吸附等温线与Freundlich和Langmuir吸附等温线型号均匀，并且使用伪二阶动力学模型很好地拟合了吸附动力学。还评估了热力学参数，例如标准的Gibbs自由能（Delta G），焓变（Delta H）和标准熵变（Delta S）。热力学分析表明，铬酸盐对MCM-49 / MCM-41的吸附是自发性和放热过程。这些结果表明MCM-49 / MCM-41可以作为有希望的吸附剂，用于潜在应用在废水中除去铬酸盐。

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  • 来源
    《RSC Advances》 |2016年第75期|共9页
  • 作者

    Wei Liguo; Zhang Hongsen; Dong Yongli; Song Weina; Liu Xiaoxu; Zhao Zhifei;

  • 作者单位

    Heilongjiang Univ Sci &

    Technol Coll Environm &

    Chem Engn Harbin 150022 Peoples R China;

    Heilongjiang Univ Sci &

    Technol Coll Environm &

    Chem Engn Harbin 150022 Peoples R China;

    Heilongjiang Univ Sci &

    Technol Coll Environm &

    Chem Engn Harbin 150022 Peoples R China;

    Heilongjiang Univ Sci &

    Technol Coll Environm &

    Chem Engn Harbin 150022 Peoples R China;

    Heilongjiang Univ Sci &

    Technol Coll Environm &

    Chem Engn Harbin 150022 Peoples R China;

    Heilongjiang Univ Sci &

    Technol Coll Environm &

    Chem Engn Harbin 150022 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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