Surfactant- and template-free hydrothermal assembly of Cu2O visible light photocatalysts for trimethoprim degradation
Surfactant- and template-free hydrothermal assembly of Cu2O visible light photocatalysts for trimethoprim degradation
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DOI：
10.1016/j.apcatb.2020.119741
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发表时间：
2021-05
影响因子：
22.1
通讯作者：
K. Sekar;Chitiphon Chuaicham;Umamahesh Balijapalli;Wei Li;K. Wilson;Adam F. Lee;K. Sasaki
中科院分区：
文献类型：
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作者：
K. Sekar;Chitiphon Chuaicham;Umamahesh Balijapalli;Wei Li;K. Wilson;Adam F. Lee;K. Sasaki
无表面活性剂，低温水热合成的Cu 2 O纳米结构的光催化降解的甲氧苄啶（TMP），一种环境异生物质的应用。通过体相和表面显微镜及光谱分析，确定了不同尺寸和形状的Cu 2 O纳米结构的光物理性质。TMP氧化降解的可见光光活性对光激发的电荷载流子体复合的速率敏感，因此Cu 2 O微晶的尺寸也敏感。观察到分级Cu 2 O纳米结构的最佳光降解活性，该纳米结构包括成核为50 - 80 nm颗粒的11 nm微晶，其自身聚结成400 nm致密团聚体。比活度为1.12 μmol.g−1。min-1，与之前报道的需要更高能量和/或强度的UV照射的结果相当。TMP的逐步羟基化和氧化裂解形成单环片段是由在分级Cu 2 O纳米结构上光生的羟基自由基驱动的，其表现出>25 h的优异催化稳定性。
A surfactant-free, low temperature hydrothermal synthesis of Cu2O nanostructures is demonstrated for application to the photocatalytic degradation of trimethoprim (TMP), an environmental xenobiotic. Photophysical properties of different size and shape Cu2O nanostructures were determined by bulk and surface microscopic and spectroscopic analyses. Visible light photoactivity for the oxidative degradation of TMP is sensitive to the rate of photoexcited charge carrier bulk recombination, and therefore the size of Cu2O crystallites. Optimum photodegradation activity was observed for a hierarchical Cu2O nanostructure, comprising 11 nm crystallites nucleated as 50−80 nm particles, themselves coalesced into 400 nm compact agglomerates. The specific activity of 1.12 μmol.g−1. min−1for a 0.1 mM TMP aqueous solution is comparable to previous reports that required higher energy and/intensity UV irradiation. The stepwise hydroxylation and oxidative cleavage of TMP to form monocylic fragments is driven by hydroxyl radicals photogenerated over the hierarchical Cu2O nanostructure, which exhibits excellent catalytic stability for >25 h.