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Removal of dyes by a novel fly ash-chitosan-graphene oxide composite adsorbent

机译:用新型飞灰 - 壳聚糖 - 石墨烯氧化物复合吸附剂去除染料

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摘要

A novel graphene oxide-based adsorbent (FCGO) is synthesized from fly ash cross-linked with chitosan and graphene oxide and characterized through scanning electron microscopy, X-ray diffraction and Fourier transform infrared analyses. The adsorbent effectively removes anionic and cationic dyes, namely, acid red GR (ARG) and cationic red X-5GN (CRX), respectively. The removal ratio of ARG by FCGO decreases with increasing initial pH in acidic solutions but is not affected at pH higher than 6. By contrast, initial pH minimally influences the removal ratio of CRX. After the adsorption of ARG and CRX by FCGO, the final pH becomes close to neutral in acidic medium because of the protonation effect. The adsorption kinetics of ARG and CRX follow the pseudo-second-order kinetic model. Adsorption is mainly controlled by boundary diffusion and internal diffusion for ARG but only by boundary diffusion for CRX, and the process satisfactorily fits with the Redlich-Peterson model. The maximum adsorption capacities are 38.87 and 64.50 mg g(-1) for ARG and CRX, respectively. Negative Delta G(0) values (ARG: -2.909 kJ mol(-1) to -4.592 kJ mol(-1), CRX: -2.526 kJ mol(-1) to -4.738 kJ mol(-1)) and positive Delta H-0 values (ARG: 22.299 kJ mol(-1) and CRX: 15.669 kJ mol(-1)) indicate that adsorption is a spontaneous and endothermic process.
机译:与脱乙酰壳多糖和氧化石墨烯的新型的基于氧化石墨烯的吸附剂(FCGO)从飞灰合成的交联和通过表征扫描电子显微镜,X射线衍射和Fourier变换红外分析。吸附剂有效地去除阴离子和阳离子染料,即,分别酸性红GR(ARG)和阳离子红色X-5GN(CRX)。通过FCGO ARG的去除率与在酸性溶液中增加初始pH降低,但在pH不影响比6.相比之下更高,初始pH值最低限度地影响CRX的除去率。 ARG和CRX通过FCGO吸附后,将最终的pH值变得接近,以在酸性介质中,因为中性的质子化的效果。 ARG和CRX的吸附动力学遵循伪二级动力学模型。吸附主要是通过用于ARG界扩散和内部扩散,而是仅由过程令人满意地与瑞德利奇彼得森模型拟合界扩散为CRX,和控制。最大吸附容量分别为38.87和64.50毫克克(-1)分别ARG和CRX。负德尔塔G(0)的值(ARG:-2.909千焦耳摩尔(-1),以千焦-4.592摩尔(-1),CRX:-2.526千焦耳摩尔(-1),以千焦-4.738摩尔(-1))和阳性德尔塔H-0的值(ARG:22.299千焦耳摩尔(-1),CRX:15.669千焦耳摩尔(-1))表明,吸附是自发的吸热过程。

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  • 来源
    《RSC Advances》 |2016年第22期|共8页
  • 作者单位

    Anhui Univ Technol Sch Energy &

    Environm Maanshan 243002 Peoples R China;

    Anhui Univ Technol Sch Energy &

    Environm Maanshan 243002 Peoples R China;

    Anhui Univ Technol Sch Energy &

    Environm Maanshan 243002 Peoples R China;

    Shangluo Univ Shaanxi Key Lab Comprehens Utilizat Tailings Reso Shangluo 726000 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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