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Solar light assisted green synthesis of photoreduced graphene oxide for the high-efficiency adsorption of anionic dyes

机译：太阳能光线辅助光绿色合成光导氧化物用于阴离子染料的高效吸附

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摘要

Graphene oxide (GO) with unique physical and chemical properties, such as high specific surface area, chemical stability and environmental friendliness, has been considered as an excellent adsorbent to remove organic dyes from polluted water. However, because of the electrostatic repulsion between the GO and anionic dyes, the adsorption capacity for anionic dyes is undesirable. Here photoreduced GO (PRGO) was prepared by solar light irradiation and used to investigate the adsorption capacity for anionic dyes. The obtained GO and PRGO were characterized by UV-visible absorption, Raman spectroscopy, atomic force microscopy (AFM), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS). The adsorption kinetics and isotherms were evaluated through adsorption experiments of the anionic orange II (OII) dye adsorbed on GO or PRGO. The results revealed that the adsorption was an exothermic process and followed pseudo-second order kinetics. Four more typical anionic dyes, methyl orange (MO), Ponceau S (PS), Azo Rubine (AR), and Trypan Blue (TB), were also used to compare the adsorption capacities between GO and PRGO. It was demonstrated that the adsorption capacity of anionic dyes was significantly enhanced by PRGO, and the maximum enhancement was up to 8 fold. In conclusion, PRGO reduction by solar light irradiation in a green, convenient and cost effective manner, offers promise for the high-efficiency removal of anionic dyes in water treatment.
机译：石墨烯氧化物（GO）具有独特的物理和化学性质，例如高比表面积，化学稳定性和环境友好性，被认为是从污染水中除去有机染料的优异吸附剂。然而，由于去和阴离子染料之间的静电排斥，阴离子染料的吸附能力是不希望的。在这里，通过太阳光照照射制备了曝光（PRGO），并用于研究阴离子染料的吸附能力。通过UV可见的吸收，拉曼光谱，原子力显微镜（AFM），扫描电子显微镜（SEM），傅里叶变换红外（FTIR）和X射线光电子谱（XPS）的特征在于，所获得的Go和PRGO。通过吸附在Go或PRGO上的阴离子橙II（OII）染料的吸附试验来评估吸附动力学和等温。结果表明，吸附是放热过程，然后遵循伪二阶动力学。还用于比较Go和PRGO之间的吸附能力，四种更典型的阴离子染料，甲基橙（Mo），Ponceau S（Ps），偶氮铷（Ar）和台盼蓝（Tb）。结果证明，PRGO明显增强阴离子染料的吸附能力，最大增强率高达8倍。总之，通过太阳光照射的GRGO通过绿色，方便和成本效益的方式减少，提供了对水处理中阴离子染料的高效除去的承诺。

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  • 来源
    《RSC Advances》 |2017年第84期|共11页
  • 作者

    Gong Yani; Qin Chengbing; He Wenjun; Qiao Zhixing; Zhang Guofeng; Chen Ruiyun; Gao Yan; Xiao Liantuan; Jia Suotang;

  • 作者单位

    Shanxi Univ Inst Laser Spect State Key Lab Quantum Opt &

    Quantum Opt Devices Taiyuan 030006 Shanxi Peoples R China;

    Shanxi Univ Inst Laser Spect State Key Lab Quantum Opt &

    Quantum Opt Devices Taiyuan 030006 Shanxi Peoples R China;

    Shanxi Univ Inst Laser Spect State Key Lab Quantum Opt &

    Quantum Opt Devices Taiyuan 030006 Shanxi Peoples R China;

    Shanxi Univ Inst Laser Spect State Key Lab Quantum Opt &

    Quantum Opt Devices Taiyuan 030006 Shanxi Peoples R China;

    Shanxi Univ Inst Laser Spect State Key Lab Quantum Opt &

    Quantum Opt Devices Taiyuan 030006 Shanxi Peoples R China;

    Shanxi Univ Inst Laser Spect State Key Lab Quantum Opt &

    Quantum Opt Devices Taiyuan 030006 Shanxi Peoples R China;

    Shanxi Univ Inst Laser Spect State Key Lab Quantum Opt &

    Quantum Opt Devices Taiyuan 030006 Shanxi Peoples R China;

    Shanxi Univ Inst Laser Spect State Key Lab Quantum Opt &

    Quantum Opt Devices Taiyuan 030006 Shanxi Peoples R China;

    Shanxi Univ Inst Laser Spect State Key Lab Quantum Opt &

    Quantum Opt Devices Taiyuan 030006 Shanxi Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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