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Kinetics of Ionic Dyes Adsorption with Magnetic-Modified Sewage Sludge

机译:磁性改性污泥吸附离子染料的动力学

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摘要

Sewage sludge is modified by pretreatment with a synthetic ferrite process, which turns the sewage sludge into an absorbent for ionic dyes and the adsorbent can be removed by a magnetic field. When Fe_3O_4 is synthesized on the surface of sewage sludge, the surface potential of particles is manipulated by adjusting the pH. For Fe_3O_4 synthesis, the molar ratio of Fe~(2+) to Fe~(3+) was 1. In our experiment, two magnetic adsorbents are made (A5 and A10) using 5 g and 10 g doses of sewage sludge, respectively. A5 is used to adsorb Procion Red Mx-5B (PR) and A10 is used to adsorb Methyl-ene Blue (MB). The specific surface area of A5 is 49.08 m~2/g. The ideal pH for PR adsorption is found to be 3 with a maximum adsorption capacity of 0.031 mmol/g (18.83 mg/g). For A10, the specific surface area is 39.84 m~2/g, and ideal pH is 6 for MB adsorption with maximum adsorption capacity being 0.078 mmol/g (2506 mg/g). The kinetics study reveals that MB and PR adsorptions fit well a pseudo-second-order kinetic model, and the values of activation energy calculated from the rate constants are 42.82 kJ/mol and 47.19 kJ/mol for MB and PR, respectively. MB and PR adsorption can be characterized as activated chemical adsorption.
机译:污水污泥可通过合成铁氧体工艺进行预处理,从而将污水污泥转变为离子染料的吸收剂,并且可以通过磁场去除吸附剂。在污水污泥表面合成Fe_3O_4时,通过调节pH值可以控制颗粒的表面电势。对于Fe_3O_4的合成,Fe〜(2+)与Fe〜(3+)的摩尔比为1。在我们的实验中,分别使用5 g和10 g剂量的污泥制备了两种磁性吸附剂(A5和A10)。 。 A5用于吸附Procion Red Mx-5B(PR),A10用于吸附亚甲基蓝(MB)。 A5的比表面积为49.08m〜2 / g。发现PR吸附的理想pH为3,最大吸附容量为0.031 mmol / g(18.83 mg / g)。对于A10,比表面积为39.84 m〜2 / g,MB吸附的理想pH为6,最大吸附容量为0.078 mmol / g(2506 mg / g)。动力学研究表明,MB和PR的吸附非常适合拟二级动力学模型,根据速率常数计算出的MB和PR的活化能分别为42.82 kJ / mol和47.19 kJ / mol。 MB和PR吸附可表征为活性化学吸附。

著录项

  • 来源
    《Environmental progress》 |2014年第3期|905-912|共8页
  • 作者

    Shao-Hua Hu; Shen-Chih Hu;

  • 作者单位

    Department of Civil Engineering & Environmental Resource Management, Dahan Institute of Technology, Hualien 971, Taiwan;

    Department of Materials Science and Engineering, National Dong Hwa University, Hualien 971, Taiwan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ferrite; methylene blue; procion red MX-5B;

    机译:铁氧体亚甲蓝;procion红色MX-5B;
  • 入库时间 2022-08-17 13:28:13

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