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首页> 外文期刊>Desalination and water treatment >Biosorption of toxic congo red dye from aqueous solution by eco-friendly biosorbent Saccharum bengalense: kinetics and thermodynamics
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Biosorption of toxic congo red dye from aqueous solution by eco-friendly biosorbent Saccharum bengalense: kinetics and thermodynamics

机译：环保型生物吸附剂孟加拉糖酵母对水溶液中有毒刚果红染料的生物吸附：动力学和热力学

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摘要

In the present study, Saccharum bengalense (SB), a potential biosorbent, was investigated for the removal of toxic Congo red (CR) dye. The effect of various operating variables, viz. adsorbent dosage, pH, contact time, and temperature on the removal of dye has been studied. Almost 94% removal of dye is possible after 50min at pH 2.0 under batch test conditions. It was found that a pseudo-second-order mechanism was predominant and the overall rate of the dye adsorption process appears to be controlled by more than one step. The intra-particle diffusion model was applied to investigate the rate determining step. Langmuir, Fre-undlich, and Dubinin-Radushkevich adsorption isotherm models were applied to describe the biosorption isotherm. The biosorption data were better represented by the Langmuir model and the biosorption capacity (q_(max)) of SB for CR was achieved at 125mg/g. Thermo-dynamic parameters such as standard free energy change (ΔG°), standard enthalpy change (ΔH°), and standard entropy change (ΔS°) were calculated and revealed the spontaneous, endothermic, and feasible nature of the adsorption process. Biomass derived from the pulp of SB was evaluated as an effective biosorbent for removal of CR dye.
机译：在本研究中，对孟加拉糖精（SB）（一种潜在的生物吸附剂）进行了研究，以去除有毒的刚果红（CR）染料。各种操作变量的影响，即。已经研究了吸附剂的用量，pH，接触时间和温度对去除染料的影响。在批处理条件下于pH 2.0下50分钟后，几乎可以去除94％的染料。发现伪二级机理是主要的，并且染料吸附过程的总速率似乎由一个以上的步骤控制。应用粒子内扩散模型研究速率确定步骤。 Langmuir，Fre-undlich和Dubinin-Radushkevich吸附等温线模型用于描述生物吸附等温线。朗格缪尔模型更好地代表了生物吸附数据，在125mg / g的条件下，SB对CR的生物吸附能力（q_（max））得以实现。计算了热力学参数，例如标准自由能变化（ΔG°），标准焓变（ΔH°）和标准熵变（ΔS°），并揭示了吸附过程的自发性，吸热性和可行性。来自SB纸浆的生物质被评估为去除CR染料的有效生物吸附剂。

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  • 来源
    《Desalination and water treatment》 |2013年第30期|5638-5648|共11页
  • 作者

    Muhammad Imran Din; Zaib Hussain; Muhammad Latif Mirza; Muhammad Makshoof Athar; Asadullah Madni; Saeed Ahmad;

  • 作者单位

    Department of Chemistry, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan,Institute of Chemistry, University of Punjab, Lahore 54590, Pakistan;

    Institute of Chemistry, University of Punjab, Lahore 54590, Pakistan;

    Department of Chemistry, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan;

    Institute of Chemistry, University of Punjab, Lahore 54590, Pakistan;

    Department of Pharmacy, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan;

    Department of Pharmacy, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan;

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

    Biosorbent; Saccharum bengalense; Congo red; Kinetics;

    机译：生物吸附剂孟加拉糖刚果红;动力学;

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