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首页> 外文期刊>RSC Advances >Convenient pH-responsive removal of Acid Black 1 by green l-histidine/iron oxide magnetic nanoadsorbent from water: performance and mechanistic studies
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Convenient pH-responsive removal of Acid Black 1 by green l-histidine/iron oxide magnetic nanoadsorbent from water: performance and mechanistic studies

机译：通过绿色L-组氨酸/氧化铁磁性纳米装载物从水中方便的pH-响应除去酸黑1：性能和机械研究

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摘要

This study was aimed at developing green histidine-modified Fe3O4 nanoparticles (His-MNPs) for the adsorptive removal of Acid Black 1 (AB1) from aqueous solution. The His-MNPs were characterized by atomic force microscopy, scanning electron microscopy-energy dispersive X-ray spectrometry, infra-red spectra and thermogravimetry. These MNPs were spherical (average diameter 11-28 nm) with polydispersity index of 1.40 and about 13% mass coating of histidine. To optimize AB1 adsorption on HisMNPs and understand its mechanism, the influences of different operational variables (pH, adsorbent amount, temperature, initial AB1 concentration, contact time, ionic strength, etc.) on adsorption were examined with adsorption isotherms, kinetics and thermodynamic studies. The AB1 adsorption from water was fast with equilibrium time = 45 min. The adsorption equilibrium was best fitted to the Langmuir isotherm model (q(max) = 166.7 mg g(-1) at the adsorbent dose of 0.2 g L-1, temperature 30 degrees C and pH 4). The linearity order for other isotherms was as follows: Dubinin-Radushkevich (D-R) Temkin Freundlich. The kinetics of the AB1 adsorption demonstrated the best compliance with the pseudosecond- order model, predominantly controlled by film diffusion as compared to intraparticle diffusion. Thermodynamic parameters (Delta H degrees and Delta G degrees) reflected the exothermic and spontaneous adsorption process. The values of Delta G degrees, Delta H degrees, activation energy and D-R free adsorption energy were all consistent with the physisorptive removal of AB1. The spectral (electronic and IR) and pH studies further corroborated the mechanism of AB1 removal by His-MNPs. The His-MNPs showed efficient adsorption, easy regeneration and excellent reusability, assisted by their pH-responsive properties. The prepared adsorbent can provide a safe, effective and economical alternative strategy for removing azo dyes from wastewater.
机译：该研究旨在开发绿色组氨酸改性的Fe3O4纳米颗粒（His-Mnps），用于从水溶液中吸附酸黑色1（AB1）的吸附除去。他-MNP的特征在于原子力显微镜，扫描电子显微镜 - 能量分散X射线光谱，红外光谱和热重率。这些MNP具有球形（平均直径11-28nm），多分散指数为1.40和约13％的组氨酸质量涂层。为了优化对HismNPS的AB1吸附并理解其机制，用吸附等温线，动力学和热力学研究检查不同操作变量（pH，吸附量，温度，初始AB1浓度，接触时间，离子强度，接触时间，离子强度等）的影响。从水中吸附来自水的吸附，平衡时间快速＆ 45分钟。吸附平衡最适合于Langmuir等温模型（Q（max）= 166.7mg g（-1），在0.2g l-1，温度30℃和pH 4）。其他等温线的线性顺序如下：Dubinin-Radushkevich（D-R）＆ Temkin＆ Freundlich。 AB1吸附的动力学证明了与椎间内侧扩散相比，主要通过薄膜扩散控制的伪级阶模型。热力学参数（Delta H度和Delta G度）反映了放热和自发的吸附过程。 δG度，δH度，活化能量和D-R游吸附能量的值均符合AB1的物质去除。光谱（电子和IR）和pH研究进一步证实了他-MNP的AB1去除的机制。他的MNPS显示出有效的吸附，易再生和优异的可重用性，通过其pH响应性辅助。制备的吸附剂可提供安全，有效且经济的替代策略，用于从废水中除去偶氮染料。

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  • 来源
    《RSC Advances》 |2019年第6期|共19页
  • 作者

    Qurrat-ul-Ain; Khatoon Jaweria; Shah Muhammad Raza; Malik Muhammad Imran; Khan Iffat Abdul Tawab; Khurshid Sumaira; Naz Raheela;

  • 作者单位

    Univ Karachi Dept Chem Fac Sci Karachi 75270 Pakistan;

    Fed Urdu Univ Arts Sci &

    Technol Dept Chem Gulshan E Iqbal Campus Karachi 75300 Pakistan;

    Univ Karachi ICCBS HEJ Res Inst Chem Karachi 75270 Pakistan;

    Univ Karachi ICCBS HEJ Res Inst Chem Karachi 75270 Pakistan;

    Fed Urdu Univ Arts Sci &

    Technol Dept Chem Gulshan E Iqbal Campus Karachi 75300 Pakistan;

    Fed Urdu Univ Arts Sci &

    Technol Dept Chem Gulshan E Iqbal Campus Karachi 75300 Pakistan;

    Univ Karachi Dept Chem Fac Sci Karachi 75270 Pakistan;

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  • 正文语种 eng
  • 中图分类 化学;
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