Facile synthesis of organic-inorganic layered nanojunctions of g-C3N4/(BiO)2CO3 as efficient visible light photocatalyst.
Facile synthesis of organic-inorganic layered nanojunctions of g-C3N4/(BiO)2CO3 as efficient visible light photocatalyst.
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DOI：
10.1039/c4dt00513a
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发表时间：
2014-07
影响因子：
4
通讯作者：
Wendong Zhang;Yanjuan Sun;F. Dong;Wei Zhang;Shuo Duan;Qin Zhang
中科院分区：
文献类型：
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作者：
Wendong Zhang;Yanjuan Sun;F. Dong;Wei Zhang;Shuo Duan;Qin Zhang
采用一锅法在室温下将（BiO）2CO 3纳米片原位沉积到g-C3 N4纳米片表面，制备了新型g-C3 N4/（BiO）2CO 3有机-无机纳米复合光催化剂。采用X射线衍射（XRD）、傅里叶变换红外（FT-IR）、X射线光电子能谱（XPS）、透射电子显微镜（TEM）、高分辨透射电子显微镜（HRTEM）、紫外-可见漫反射光谱（DRS）、N2吸附-脱附分析和电子自旋共振（ESR）等手段对样品进行了表征。通过在可见光照射下降解水溶液中的罗丹明B（RhB）和苯酚来评价合成样品的光催化活性。对于RhB和苯酚的降解，g-C3 N4/（BiO）2CO 3纳米结表现出比纯g-C3 N4和（BiO）2CO 3更高的可见光催化活性。光催化活性的提高主要归因于g-C3 N4 {002}和（BiO）2CO 3 {002}之间的能带结构匹配、染料光敏化以及有效的晶面耦合作用。stecO_2（-）自由基被确定为主要活性物种。此外，具有高度暴露的{002}晶面的纯（BiO）2CO 3对RhB的降解也表现出优异的可见光光活性，这可能源于间接染料光敏化。本研究为大气CO2在绿色合成化学中的高效利用提供了新的思路。
Novel g-C3N4/(BiO)2CO3 organic-inorganic nanojunctioned photocatalysts were synthesized by in situ depositing (BiO)2CO3 nanoflakes onto the surface of g-C3N4 nanosheets through a one-pot efficient capture of atmospheric CO2 method at room temperature. The as-synthesized samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), UV-vis diffuse reflectance spectroscopy (DRS), N2 adsorption-desorption analysis and electron spin resonance (ESR). The photocatalytic activity of as-synthesized samples was evaluated by degrading Rhodamine B (RhB) and phenol in aqueous solution under visible-light irradiation. The g-C3N4/(BiO)2CO3 nanojunctions showed much higher visible-light photocatalytic activity than those of pure g-C3N4 and (BiO)2CO3 for the degradation of RhB and phenol. The enhanced photocatalytic activity can be mainly ascribed to the well-matched band structures, dye photosensitization and efficient crystal facets coupling interaction between g-C3N4 {002} and (BiO)2CO3 {002}. The ˙O2(-) radicals were identified as the main active species. Furthermore, the pure (BiO)2CO3 with highly exposed {002} crystal facets also exhibited excellent visible-light photoactivity for the degradation of RhB, which can be originated from the indirect dye photosensitization. The present work could provide a new strategy for the efficient utilization of atmospheric CO2 in green synthetic chemistry.