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首页> 外文期刊>RSC Advances >Selective removal of lead ions from aqueous solutions using 1,8-dihydroxyanthraquinone (DHAQ) functionalized graphene oxide; isotherm, kinetic and thermodynamic studies
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Selective removal of lead ions from aqueous solutions using 1,8-dihydroxyanthraquinone (DHAQ) functionalized graphene oxide; isotherm, kinetic and thermodynamic studies

机译：使用1,8-二羟基醌（DHAQ）官能化的石墨烯氧化物选择性地从水溶液中除去铅离子; 等温，动力学和热力学研究

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摘要

An anthraquinone - graphene structure was fabricated and applied for the removal of lead(II) from aqueous solution. The equilibrium occurred in about 10 min revealing the high adsorption rate at the beginning of the process. The maximum Pb(II) adsorption capacity of the Fe3O4@DHAQ_GO nanocomposite was about 283.5 mg g(-1) that was observed at 323 K and pH 5.5. The Pb(II) adsorption ability increased with the increasing pH. The isotherm and kinetic studies indicated that the Sips isotherm model and the linear form of the pseudo-second kinetic model had a better fit with the experimental results. The positive value of Delta H-0 indicated endothermic interactions between Pb(II) and Fe3O4@DHAQ_GO. The negative Delta G(0) indicated that the reactions are spontaneous with a high affinity for Pb(II). The positive Delta S-0 values indicated increasing randomness at the solid-solute interface during the adsorption process. The selective removal of Pb(II) by the nanocomposite confirms the presence of higher-affinity binding sites for Pb(II) than Cd(II), Co(II), Zn(II), and Ni(II) ions. Furthermore, the Fe3O4@DHAQ_GO nanocomposite revealed an excellent preferential adsorbent for Pb(II) spiked in drinking water samples containing natural ion matrices. EDTA-2NA 0.01 N was found to be a better elution agent than HCl 0.1 M for the nanocomposite regeneration. After five adsorption/desorption cycles using EDTA-2NA 0.01 N, more than 84% of the adsorbed Pb(II) was still desorbed in 30 min. Capturing sub-ppm initial concentrations of Pb(II) and the capability to selectively remove lead from drinking water samples make the Fe3O4@DHAQ_GO nanocomposite practically convenient for water treatment purposes. High adsorption capacity and facile chemical synthesis route are the other advancements.
机译：制造蒽醌 - 石墨烯结构并施加用于从水溶液中除去铅（II）。在大约10分钟内发生平衡显示过程开始时的高吸附速率。 Fe3O4 @ DH​​AQ_GO纳米复合材料的最大PB（II）吸附容量约为283.5mg（-1），在323k和pH5.5处观察。随着pH的增加，Pb（II）吸附能力增加。等温和动力学研究表明，啜饮等温模型和伪第二动力学模型的线性形式具有更好的实验结果。 Delta H-0的正值表明PB（II）和FE3O4 @ DH​​AQ_GO之间的吸热相互作用。负ΔG（0）表明反应是对Pb（II）的高亲和力的自发性。正δ的S-0值表明吸附过程中的固体溶质界面中的随机性增加。通过纳米复合材料选择性除去Pb（II）的Pb（II）证实了Pb（II）的高亲和力结合位点的存在于CD（II），CO（II），Zn（II）和Ni（II）离子。此外，Fe3O4 @ DH​​AQ_GO纳米复合材料显示出掺入含有天然离子基质的饮用水样品中的PB（II）的优先优先吸附剂。发现EDTA-2NA 0.01n是优于HCl 0.1M的更好的洗脱剂，用于纳米复合材料再生。在使用EDTA-2NA的五个吸附/解吸循环后，在30分钟内仍未吸收超过84％的吸附性Pb（II）。捕获PB（II）的次PPM初始浓度和选择性地从饮用水样品中选择性地除去铅的能力使FE3O4 @ DH​​AQ_GO纳米复合材料实际上方便的水处理目的。高吸附能力和容易化学合成途径是其他进步。

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  • 来源
    《RSC Advances》 |2018年第11期|共10页
  • 作者

    Khazaei Mohammad; Nasseri Simin; Ganjali Mohammad Reza; Khoobi Mehdi; Nabizadeh Ramin; Gholibegloo Elham; Nazmara Shahrokh;

  • 作者单位

    Hamadan Univ Med Sci Sch Publ Hlth Dept Environm Hlth Engn Hamadan Iran;

    Univ Tehran Med Sci Dept Environm Hlth Engn Sch Publ Hlth POB 14155-6446 Tehran Iran;

    Univ Tehran Ctr Excellence Electrochem Fac Chem Tehran Iran;

    Univ Tehran Med Sci Dept Pharmaceut Biomat Fac Pharm Tehran Iran;

    Univ Tehran Med Sci Dept Environm Hlth Engn Sch Publ Hlth POB 14155-6446 Tehran Iran;

    Univ Zanjan Fac Sci Dept Chem Zanjan Iran;

    Univ Tehran Med Sci Dept Environm Hlth Engn Sch Publ Hlth POB 14155-6446 Tehran Iran;

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