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首页> 外文期刊>The Science of the Total Environment >Insights into the rapid elimination of antibiotics from aqueous media by tunable C_3N_4 photocatalysts: Effects of dopant amount, co-existing ions and reactive oxygen species
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Insights into the rapid elimination of antibiotics from aqueous media by tunable C_3N_4 photocatalysts: Effects of dopant amount, co-existing ions and reactive oxygen species

机译:可调C_3N_4光催化剂对从水性介质中快速消除抗生素的见解:掺杂量,共存离子和活性氧的影响

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摘要

Conventional photocatalytic nanomaterials are not environmentally sustainable since these are usually produced from scarce mineral and metal precursors. Moreover, high pollutant removal efficiencies by conventional photocatalysts are only attained after several hours of reaction with light. In this study, novel visible light-active photocatalysts were synthesized from environment-friendly carbon precursors and applied for the rapid degradation of sulfamethoxazole (SMX) in aqueous solutions. The photocatalysts were prepared via the co-pyrolysis of urea with varying doping temperature and dopant amount. These variations played a vital role in improving the performance of the photocatalysts and resulted in up to 99% SMX removal within 45 min of visible light irradiation. Characterization of the photocatalysts showed that potassium and iodine dopants were responsible in the red shift and broadening of the light absorption spectrum to the visible region. In addition, the band gap energy narrowed by 0.23 eV resulting in faster charge transfer but slower recombination of the photo-generated electron and hole pairs. Effects of varying concentrations of inorganic salts (NO3-, SO42-, Cl-, PO43-) on SMX removal were also examined. Lastly, the mechanism of SMX photodegradation was elucidated. (C) 2019 Elsevier B.V. All rights reserved.
机译:常规的光催化纳米材料在环境上不可持续,因为它们通常是由稀有的矿物和金属前体制成的。而且,仅在与光反应数小时之后,才能获得常规光催化剂的高污染物去除效率。在这项研究中,新型的可见光活性光催化剂由环境友好的碳前体合成,并用于水溶液中磺胺甲恶唑(SMX)的快速降解。通过在不同的掺杂温度和掺杂剂量下将尿素共热解制备光催化剂。这些变化在改善光催化剂的性能方面起着至关重要的作用,并导致在可见光照射后45分钟内去除高达> 99%的SMX。光催化剂的表征表明,钾和碘掺杂剂是导致红移和光吸收光谱扩展到可见光区域的原因。此外,带隙能量缩小了0.23 eV,导致更快的电荷转移,但光生电子和空穴对的重新结合较慢。还检查了不同浓度的无机盐(NO3-,SO42-,Cl-,PO43-)对SMX去除的影响。最后,阐明了SMX光降解的机理。 (C)2019 Elsevier B.V.保留所有权利。

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