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Adsorption of Cd(II) from aqueous solution by biogenic selenium nanoparticles

机译：生物硒纳米粒子水溶液吸附CD（II）

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摘要

Biogenic selenium nanoparticles (BioSeNPs), which were produced by aerobic granular sludge in a sequencing batch reactor (SBR), were used to remove cadmium from aqueous solution. Batch experiments were carried out to investigate the effect of contact time, initial solution pH and adsorbent dosage on adsorption. The Langmuir model was more suitable to describe the adsorption process than the Freundlich model, with a monolayer maximum adsorption capacity of 59.7 mg g(-1) for Cd(II) adsorption by the BioSeNPs. The isotherm data were also well described by the Temkin model, which further supported that Cd(II) adsorption was a chemisorption process. The adsorption kinetics data were well described by the pseudo-second-order kinetic model with r(2) values exceeding 0.999. The overall rate process was influenced by both external mass transfer and intraparticle diffusion, but was mainly controlled by intraparticle diffusion. The negative values of Delta G(0) and Delta H-0 indicated that the adsorption process was spontaneous and exothermic. Energy dispersive X-ray spectrometry (EDS) analysis confirmed that Cd(II) was adsorbed onto BioSeNPs. After being loaded with Cd(II), the BioSeNPs had less negative zeta potential values and no obvious change in the isoelectric point was observed. The Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis indicated that the removal of Cd(II) was a complicated process, in which electrostatic attraction and surface complex formation were involved. The results demonstrated that BioSeNPs could be used to remove cadmium from aqueous solution with high efficiency.
机译：通过在测序批量反应器（SBR）中通过有氧颗粒污泥产生的生物硒纳米颗粒（Biosenps），用于从水溶液中除去镉。进行批量实验以研究接触时间，初始溶液pH和吸附剂剂量对吸附的影响。 Langmuir模型更适合于描述比Freundlich模型的吸附过程，具有59.7mg G（-1）的单层最大吸附容量，用于Biensps的CD（II）吸附。 ISotherm数据也通过Temkin模型很好地描述，其进一步支持CD（II）吸附是化学吸附过程。吸附动力学数据通过伪二阶动力学模型良好地描述，R（2）值超过0.999。整体速率过程受外部传质和粒前扩散的影响，但主要由骨质下扩散控制。 Delta G（0）和Delta H-0的负值表明吸附过程是自发性和放热的。能量分散X射线光谱法（EDS）分析证实CD（II）被吸附在Biosenps上。在加载CD（II）之后，Biensps具有较少的负Zeta电位值，并且观察到等电点的明显变化。傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）分析表明，去除CD（II）是一种复杂的方法，其中涉及静电吸引和表面复杂的形成。结果表明，Biensps可用于以高效率从水溶液中除去镉。

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  • 来源
    《RSC Advances》 |2016年第18期|共9页
  • 作者

    Yuan Fanghui; Song Chao; Sun Xuefei; Tan Linrui; Wang Yunkun; Wang Shuguang;

  • 作者单位

    Shandong Univ Sch Environm Sci &

    Engn Shandong Key Lab Water Pollut Control &

    Resource Jinan 250100 Peoples R China;

    Shandong Univ Sch Environm Sci &

    Engn Shandong Key Lab Water Pollut Control &

    Resource Jinan 250100 Peoples R China;

    Shandong Univ Sch Environm Sci &

    Engn Shandong Key Lab Water Pollut Control &

    Resource Jinan 250100 Peoples R China;

    Shandong Univ Sch Environm Sci &

    Engn Shandong Key Lab Water Pollut Control &

    Resource Jinan 250100 Peoples R China;

    Shandong Univ Sch Environm Sci &

    Engn Shandong Key Lab Water Pollut Control &

    Resource Jinan 250100 Peoples R China;

    Shandong Univ Sch Environm Sci &

    Engn Shandong Key Lab Water Pollut Control &

    Resource Jinan 250100 Peoples R China;

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