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Adsorption enhancement of methylene blue dye at kaolinite clay-water interface influenced by electrolyte solutions

机译:电解质溶液影响高岭土粘土界面亚甲基蓝染料的吸附

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摘要

The contamination of surface water by dyes released from the effluent of textile industries is a major environmental concern. Adsorption is a cheap and easy separation technique to remove dyes from the effluent water. In this study, the adsorption behaviors of a widely used cationic dye, methylene blue (MB), on kaolinite clay surface in the presence and absence of electrolytes have been reported. The adsorption isotherms of MB in the absence of electrolytes follow the Langmuir model, however, in the presence of electrolytes they follow the Freundlich model. At a constant dye concentration (below the saturation equilibrium concentration), the dye adsorption increases linearly along with the increasing ionic strength of the electrolyte solutions. Among the four electrolytes (NaCl, CaCl2, Na2SO4, Na2HPO4) studied here, Na2HPO4 has the highest adsorption enhancement ability, similar to 127% with respect to that of pure MB at a 2 mM initial concentration. This study shows that the adsorption capacity of kaolinite clay can be enhanced significantly by the use of electrolytes, which is very useful for the remediation of dye contaminated waste water.
机译:从纺织业流出物中释放的染料污染地表水是一个主要的环境问题。吸附是一种便宜且易于分离的技术,以从流出水中除去染料。在本研究中,已经报道了在存在和不存在电解质的情况下,在存在和不存在电解质中,广泛使用的阳离子染料,亚甲基蓝(Mb)的吸附行为。在没有电解质的情况下,MB的吸附等温线遵循Langmuir模型,然而,在电解质存在下,它们遵循Freundlich模型。在恒定的染料浓度(低于饱和平衡浓度以下),染料吸附随着电解质溶液的不断增加的离子强度而导致线性增加。在这里研究的四个电解质(NaCl,CaCl 2,Na 2 SO 4,Na 2 HPO 4)中,Na 2 HPO 4具有最高的吸附增强能力,相对于纯MB的初始浓度为纯MB的相对于127%。本研究表明,通过使用电解质可以显着提高高岭石粘土的吸附能力,这对于修复染料污染的废水非常有用。

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  • 来源
    《RSC Advances》 |2015年第39期|共6页
  • 作者单位

    Natl Inst Technol Dept Chem Engn Interfaces &

    Nanomat Lab Rourkela 769008 Orissa India;

    Natl Inst Technol Dept Chem Engn Interfaces &

    Nanomat Lab Rourkela 769008 Orissa India;

    Natl Inst Technol Dept Chem Engn Interfaces &

    Nanomat Lab Rourkela 769008 Orissa India;

    Natl Inst Technol Dept Chem Engn Interfaces &

    Nanomat Lab Rourkela 769008 Orissa India;

    Natl Inst Technol Dept Chem Engn Interfaces &

    Nanomat Lab Rourkela 769008 Orissa India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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