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首页> 外文期刊>Advanced Functional Materials >Enhanced Photocatalytic Activity using Layer-by-Layer Electrospun Constructs for Water Remediation
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Enhanced Photocatalytic Activity using Layer-by-Layer Electrospun Constructs for Water Remediation

机译：使用逐层电纺构造修复水的增强的光催化活性

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Endocrine disrupters such as bisphenol A (BPA) are environmental pollutants that interfere with the body's endocrine system because of their structural similarity to natural and synthetic hormones. Due to their strong oxidizing potential to decompose such organic pollutants, colloidal metal oxide photocatalysts have attracted increasing attention for water detoxification. However, achieving both long-term physical stability and high efficiency simultaneously with such photocatalytic systems poses many challenges. Here a layer-by-layer (LbL) deposition approach is reported for immobilizing TiO_2 nanoparticles (NPs) on a porous support while maintaining a high catalytic efficiency for photochemical decomposition of BPA. Anatase TiO_2 NPs ≈7nm in diameter self-assemble in consecutive layers with positively charged polyhedral oligomeric silsesquioxanes on a high surface area, porous electrospun polymer fiber mesh. The TiO_2 LbL nanofibers decompose approximately 2.2 mg BPA per mg of TiO_2 in 40 h of illumination (AM 1.5G illumination), maintaining first-order kinetics with a rate constant (k) of 0.15 h~(-1) for over 40 h. Although the colloidal TiO_2 NPs initially show significantly higher photocatalytic activity (k≈0.84 h~(-1)), the rate constant drops to k≈0.07 h~(-1) after 4h of operation, seemingly due to particle agglomeration. In the BPA solution treated with the multilayered TiO_2 nanofibers for 40 h, the estrogenic activity, based on human breast cancer cell proliferation, is significantly lower than that in the BPA solution treated with colloidal TiO_2 NPs under the same conditions. This study demonstrates that water-based, electrostatic LbL deposition effectively immobilizes and stabilizes TiO_2 NPs on electrospun polymer nanofibers for efficient extended photochemical water remediation.
机译：诸如双酚A（BPA）之类的内分泌干扰物是环境污染物，由于其与天然和合成激素的结构相似，会干扰人体的内分泌系统。胶态金属氧化物光催化剂由于其强大的氧化能力可分解此类有机污染物，因此越来越受到人们对水排毒的关注。然而，利用这样的光催化系统同时实现长期的物理稳定性和高效率提出了许多挑战。此处报道了一种逐层（LbL）沉积方法，可将TiO_2纳米颗粒（NPs）固定在多孔载体上，同时保持BPA的光化学分解的高催化效率。直径约7nm的锐钛矿型TiO_2 NPs在高表面积的多孔电纺聚合物纤维网上与带正电荷的多面体低聚倍半硅氧烷自组装成连续的层。 TiO_2 LbL纳米纤维在40 h照射（AM 1.5G照射）下每mg TiO_2分解约2.2 mg BPA，在超过40 h的时间内保持速率常数（k）为0.15 h〜（-1）的一级动力学。尽管胶体TiO_2 NPs最初显示出明显较高的光催化活性（k≈0.84h〜（-1）），但操作4h后，速率常数下降到k≈0.07h〜（-1），这似乎是由于颗粒团聚所致。在多层TiO_2纳米纤维处理40小时的BPA溶液中，基于人乳腺癌细胞增殖的雌激素活性明显低于在相同条件下用胶体TiO_2 NPs处理的BPA溶液。这项研究表明，基于水的静电LbL沉积可有效地固定和稳定电纺聚合物纳米纤维上的TiO_2 NP，从而有效地进行光化学水的修复。

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  • 来源
    《Advanced Functional Materials》 |2010年第15期|P.2424-2429|共6页
  • 作者

    Jung Ah Lee; rnYoon Sung Nam; rnGregory C. Rutledge; rnPaula T. Hammond;

  • 作者单位

    Department of Chemical Engineering and Institute for Soldier Nanotechnologies Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge, MA 02139 (USA);

    rnDepartment of Biological Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge, MA 02139 (USA);

    rnDepartment of Chemical Engineering and Institute for Soldier Nanotechnologies Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge, MA 02139 (USA);

    rnDepartment of Chemical Engineering and Institute for Soldier Nanotechnologies Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge, MA 02139 (USA);

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