Positive P/g-C3N4 thermo-coupled photocatalytic oxidation of refractory organics in wastewater for total utilization of solar Vis-IR region
Positive P/g-C3N4 thermo-coupled photocatalytic oxidation of refractory organics in wastewater for total utilization of solar Vis-IR region
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正 P/g-C3N4 热耦合光催化氧化废水中的难降解有机物，实现太阳能可见光-红外区域的完全利用
DOI：
10.1016/j.matchemphys.2020.123307
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发表时间：
2020-10
影响因子：
4.6
通讯作者：
Wang Baohui
中科院分区：
文献类型：
--
作者：
Gu Di;Zhang Shixu;Jiang Tingting;Jiang Hong;Wang Xirui;Wang Baohui
以1-丁基-3-甲基咪唑六氟磷酸盐和三聚氰胺为原料制备了磷掺杂的石墨化碳氮化物(P/g-C3N4)。一些测量包括X射线衍射(XRD)、可见-红外漫反射光谱(VIS-IR DRS)。用傅里叶变换红外光谱(FT-IR)表征了g-C3N4结构单元中P原子的配位情况。通过在g-C3N4和P/g-C3N4上降解难降解的硝基苯来考察其热耦合光催化性能。VIS-IR DRS分析表明，P的掺杂扩展了可见光-红外吸收。P的嵌入改变了薄膜的光学性质，导致能带结构向光子激发和电子/空穴分离方向移动。P/g-C3N4在60℃和30℃时的降解率分别为77.3%和39.9%，而g-C3N4在60℃和30℃时的降解率分别为63.5%和23.9%，且P/g-C3N4的高温降解速率常数是g-C3N4的1.3倍。此外，室外试验证明，与太阳热耦合后，Nb的降解效率和效果显著提高。它是一种新型的光催化剂，通过协同利用太阳能可见光区域的能量来完成废水处理，而不需要任何其他能量的输入。
P-doped graphitic carbon nitride (P/g-C3N4) were prepared by using 1-butyl-3-methylimidazolium hexafluorophosphate and melamine as precursors. Some measurements include X-ray diffraction (XRD), Visible-infrared diffuse reflection spectroscopy (Vis-IR DRS). Fourier transform infrared spectrum (FT-IR) were used for characterizing the coordination of P atoms in the g-C3N4structural units. The thermo-coupled photocatalytic performances were conducted by the degradation of refractory nitrobenzene over g-C3N4and P/g-C3N4. The Vis-IR DRS displayed that the P doping extends the absorption in the Vis-IR region. The embedded P changed the optical properties, resulting in a shift of the energy band structure in favor of the photon excitation and the electron/hole separation. The activities of the P/g-C3N4demonstrated that the degradation rate of NB with was 77.3% at 60 °C and 39.9% at 30 °C, compared with g-C3N4was 63.5% at 60 °C and 23.9% at 30 °C, moreover, the degradation rate constant for P/g-C3N4was 1.3 times higher than g-C3N4in high temperature. Moreover, the efficiency and effectiveness of NB degradation were proven to be significantly enhanced by coupling with solar heat in outdoor tests. It is a novel photocatalyst for wastewater treatment accomplished by the synergistic use of solar Vis-IR region energy without any other input of energy.
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