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首页> 外文期刊>RSC Advances >Construction of carbon quantum dots/single crystal TiO2 nanosheets with exposed {001} and {101} facets and their visible light driven catalytic activity
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Construction of carbon quantum dots/single crystal TiO2 nanosheets with exposed {001} and {101} facets and their visible light driven catalytic activity

机译：{001}和{101}面暴露的碳量子点/单晶TiO2纳米片的构建及其可见光驱动的催化活性

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Carbon quantum dots were successfully doped into anatase TiO _(2) single crystal nanosheets (TNS) with exposed {001} and {101} reactive facets by a facile solvothermal process. SEM and TEM confirmed the as-prepared TiO _(2) nanosheet structure and that the dominant exposed face is the {001} facet, and the loaded N-CDs are nearly spherical with an average size of about 3 nm. XPS results confirmed that the deposited N-CDs were chemically integrated into the TiO _(2) nanosheets. UV-vis DRS spectroscopy shows that with the dotting of N-CDs, the absorption edge of N-CDs/TNS has been extended into the visible light region. The ability of the N-CDs/TNS to degrade Rhodamine B (RhB) in aqueous solution under visible light irradiation ( λ ≥ 400 nm) was investigated. The results show that the photocatalytic performance of N-CDs/TNS was substantially improved relative to pure TNS. The photodegradation efficiency reached its maximum value with 6 mL of N-CDs/TNS, showing a 9.3-fold improvement in photocatalytic activity over TNS. Fluorescence spectroscopy (PL) and electron paramagnetic resonance (EPR) studies were conducted to characterize the active species during the degradation period, based on which the possible photodegradation mechanism of N-CDs/TNS by visible light irradiation was given.
机译：碳量子点被成功地掺杂到具有方便的溶剂热过程暴露的{001}和{101}反应面的锐钛矿型TiO_（2）单晶纳米片（TNS）中。 SEM和TEM证实了所制备的TiO_（2）纳米片结构，并且主要的暴露面为{001}面，并且负载的N-CD几乎为球形，平均尺寸为约3nm。 XPS结果证实，沉积的N-CD被化学整合到TiO_（2）纳米片中。紫外可见DRS光谱显示，随着N-CD的掺杂，N-CD / TNS的吸收边缘已扩展到可见光区域。研究了N-CDs / TNS在可见光（λ≥400 nm）照射下降解水溶液中若丹明B（RhB）的能力。结果表明，相对于纯TNS，N-CDs / TNS的光催化性能得到了显着改善。使用6 mL N-CDs / TNS时，光降解效率达到最大值，与TNS相比，光催化活性提高了9.3倍。进行了荧光光谱（PL）和电子顺磁共振（EPR）研究，以表征降解期间的活性物质，在此基础上，给出了可见光照射下N-CDs / TNS可能的光降解机理。

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