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首页> 外文期刊>Environmental Pollution >Photocatalysis of bisphenol A by an easy-settling titania/titanate composite: Effects of water chemistry factors, degradation pathway and theoretical calculation
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Photocatalysis of bisphenol A by an easy-settling titania/titanate composite: Effects of water chemistry factors, degradation pathway and theoretical calculation

机译：易沉降的二氧化钛/钛酸酯复合物对双酚A的光催化：水化学因素，降解途径和理论计算的影响

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摘要

Bisphenol A (BPA) is a widely concerned endocrine disrupting chemical and hard to be removed through conventional wastewater treatment processes. In this study, we developed a TiO2 decorated titanate nanotubes composite (TiO2/TNTs) and used for photocatalytic degradation of BPA. TEM and XRD analysis show that the TiO2/TNTs is a nano-composite of anatase and titanate, with anatase acting as the primary photocatalytic site and titanate as the skeleton. TiO2/TNTs exhibited excellent photocatalytic reactivity and its easy-settling property leaded to good reusability. After 5 reuse cycles, TiO2/TNTs also could photo degrade 91.2% of BPA with a high rate constant (k(1)) of 0.039 min(-1), which was much better than TiO2 and TNTs. Higher pH facilitated photocatalysis due to more reactive oxygen species produced and less material aggregation. The presence of NaCl and CaCl2 showed negligible effects on BPA degradation, but NaHCO3 caused an inhibition effect resulting from consumption of center dot OH. Humic acid inhibited degradation mainly due to blockage of the active sites of TiO2/TNTs. Degradation pathway was well interpreted through theoretical calculation. Hydroxyl radical played the dominate role in BPA photodegradation, and the atoms of BPA with high Fukui index based on density-functional theory (DFT) calculation are the radical easy-attacking (f(0)) sites. Considering the good photocatalytic reactivity, reusability, stability and settle property, TiO2/TNTs promises to be an efficient alternative for removal of organic compounds from wastewaters. (C) 2017 Elsevier Ltd. All rights reserved.
机译：双酚A（BPA）是一种广泛关注的内分泌干扰化学物质，很难通过常规废水处理工艺去除。在这项研究中，我们开发了一种TiO2装饰的钛酸酯纳米管复合材料（TiO2 / TNTs），并用于光催化降解BPA。 TEM和XRD分析表明，TiO2 / TNTs是锐钛矿和钛酸酯的纳米复合材料，其中锐钛矿为主要的光催化部位，钛酸酯为骨架。 TiO2 / TNTs表现出优异的光催化反应活性，其易于沉降的特性使其具有良好的可重复使用性。经过5个重复使用循环后，TiO2 / TNTs还能以0.039 min（-1）的高速率常数（k（1））光降解91.2％的BPA，这比TiO2和TNTs更好。由于产生更多的活性氧和较少的材料聚集，较高的pH值有助于光催化。 NaCl和CaCl2的存在对BPA降解的影响可忽略不计，但NaHCO3会引起中心点OH的消耗而产生抑制作用。腐殖酸抑制降解，主要是由于TiO2 / TNTs的活性位阻。通过理论计算可以很好地解释降解途径。羟基自由基在BPA光降解中起主要作用，基于密度泛函理论（DFT）计算的具有高福井指数的BPA原子是自由基易攻击（f（0））的位点。考虑到良好的光催化反应性，可重复使用性，稳定性和沉降性，TiO2 / TNTs有望成为从废水中去除有机化合物的有效替代方法。 （C）2017 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Environmental Pollution》 |2018年第1期|580-590|共11页
  • 作者

    Zhao Xiao; Du Penghui; Cai Zhengqing; Wang Ting; Fu Jie; Liu Wen;

  • 作者单位

    Peking Univ, Minist Educ, Key Lab Water & Sediment Sci, Coll Environm Sci & Engn, Beijing 100871, Peoples R China|China Agr Univ, Ctr Agr Water Res China, Beijing 100083, Peoples R China;

    Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA;

    Fudan Univ, Dept Environm Sci & Engn, Shanghai 200433, Peoples R China;

    Peking Univ, Minist Educ, Key Lab Water & Sediment Sci, Coll Environm Sci & Engn, Beijing 100871, Peoples R China;

    Fudan Univ, Dept Environm Sci & Engn, Shanghai 200433, Peoples R China;

    Peking Univ, Minist Educ, Key Lab Water & Sediment Sci, Coll Environm Sci & Engn, Beijing 100871, Peoples R China|Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Titanate nanotubes; TiO2; Photocatalysis; Bisphenol A; Easy-setting; OFT calculation;

    机译：钛酸盐纳米管;TiO2;光催化;双酚A;易定型;OFT计算;

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