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Enhanced photo-degradation of bisphenol a under simulated solar light irradiation by Zn-Ti mixed metal oxides loaded on graphene from aqueous media

机译:从含水介质中加载Zn-Ti混合金属氧化物的模拟太阳光照射下的双酚A的光降解

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摘要

In the present study, the mixed metal oxides (rGO-ZnTi-MMO-x, x presents weight percentage of GO) were obtained by thermal treatment of a Zn-Ti layered double hydroxides-graphene oxide (GO-ZnTi-LDHs) composite. rGO-ZnTi-MMOs were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectra techniques. The photocatalytic activity of the obtained photocatalysts showed significantly enhanced activities in the degradation of bisphenol A (BPA). Compared with pristine ZnTi-MMOs, 88.12% of BPA at 10 mg L-1 was degraded using 0.5 g L-1 of rGO-ZnTi-MMO-2% as a catalyst under 3 h of simulated solar light irradiation. Photo-generated holes, OH and singlet oxygen radicals were demonstrated to be the predominant active species responsible for the photo-degradation of BPA. UV-vis diffuse reflectance spectra, photoluminescence spectra electrochemical impedance spectroscopy and transient photocurrent response of the photocatalyst confirmed that the enhanced photocatalytic activity of rGO-ZnTi-MMOs composites was attributed to the extended visible light absorption region and efficient transportation and separation of photo-induced electron-hole pairs of rGO-ZnTi-MMOs with unique hetero-nanostructure. Therefore, this work presents a facile method for the fabrication of a kind of graphene-based photocatalyst for water treatment.
机译:在本研究中,通过热处理Zn-Ti层叠双氢氧化物 - 石墨烯(Go-ZnTi-LDHS)复合材料,得到混合金属氧化物(Rgo-ZnTI-MMO-X,X,呈Po的重量百分比)获得。通过扫描电子显微镜,透射电子显微镜,X射线衍射和X射线光电子谱技术来表征Rgo-ZnTi-MMO。所得光催化剂的光催化活性在双酚A(BPA)的降解中显示出显着增强的活性。与原始ZnTI-MMO相比,使用0.5g L-1的rgo-ZnTI-MMO-2%作为模拟太阳光照射的3小时,88.12%的BPA在10mg -1的rgo-ZnTI-MMO-2%下降。将光产生的孔,OH和单线氧自由基证明是负责BPA的光降解的主要活性物质。光致发光光谱电化学阻抗光谱和光催化剂的瞬态光电流响应证实,RGO-ZnTi-MMOS复合材料的增强光催化活性归因于延长的可见光吸收区和有效的光诱导的运输和分离rgo-znti-mmos的电子 - 孔对,具有独特的杂纳米结构。因此,该工作介绍了制备一种基于石墨烯的光催化剂进行水处理的容易方法。

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  • 来源
    《RSC Advances》 |2016年第32期|共10页
  • 作者单位

    S China Univ Technol Coll Environm &

    Energy Guangzhou 510006 Guangdong Peoples R China;

    S China Univ Technol Coll Environm &

    Energy Guangzhou 510006 Guangdong Peoples R China;

    S China Univ Technol Coll Environm &

    Energy Guangzhou 510006 Guangdong Peoples R China;

    S China Univ Technol Coll Environm &

    Energy Guangzhou 510006 Guangdong Peoples R China;

    S China Univ Technol Coll Environm &

    Energy Guangzhou 510006 Guangdong Peoples R China;

    S China Univ Technol Coll Environm &

    Energy Guangzhou 510006 Guangdong Peoples R China;

    S China Univ Technol Coll Environm &

    Energy Guangzhou 510006 Guangdong Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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