It’s highly desired to design and fabricate effective Z-scheme photocatalysts by promoting the charge transfer and separation. Herein, we firstly fabricated the ratio-optimized g-C₃N₄/α-Fe₂O₃ nanocomposites by adjusting the mass ratio between two components through a simple wet-chemical process. The resulting nanocomposites display much high photocatalytic activities for CO₂ conversion and phenol degradation compared to bare α-Fe₂O₃ and g-C₃N₄. Noteworthily, the photocatalytic activities are further improved by constructing Al-O bridges, by 4-time enhancement compared to those of α-Fe₂O₃. Based on the steady-state surface photovoltage spectra, transient-state surface photovoltage responses, photoelectrochemical I-t curves and the evaluation of produced OH amounts, the exceptional photoactivities of Al-O bridged g-C₃N₄/α-Fe₂O₃ nanocomposites are attributed to the significantly promoted charge transfer and separation by constructing the g-C₃N₄/α-Fe₂O₃ heterojunction and the Al-O bridges. Moreover, the charge transfer and separation of this photocatalyst have been confirmed to obey the Z-scheme mechanism, as supported by the single-wavelength photocurrent action spectra and single-wavelength photoactivities for CO₂ conversion. Furthermore, the mechanism of the photocatalytic CO₂ conversion has been elaborately elucidated through the electrochemical reduction and the photocatalytic experiments especially with isotope ^₁₃CO₂ and D₂O, that the produced H atoms as intermediate radicals would dominantly induce the conversion of CO₂ to CO and CH₄.

中文翻译：

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对于CO特殊光催化活性₂对Al-O转换桥接GC ₃ Ñ ₄ /的α-Fe ₂ ö ₃ Z-方案纳米复合材料和用同位素机构洞察

迫切需要通过促进电荷转移和分离来设计和制造有效的Z型光催化剂。在此，我们首先制造的比率优化GC ₃ Ñ ₄ /的α-Fe _2层ö ₃通过一个简单的湿式化学处理调节两种组分的质量比的纳米复合材料。将得到的纳米复合材料显示CO得多高的光催化活性₂相比裸的α-Fe的转化率和苯酚降解₂ ö ₃和GC ₃ Ñ ₄。Noteworthily，光催化活性被进一步通过构造的Al-O桥改善，由4-时间增强相比，这些的的α-Fe ₂O ₃。基于稳态表面光电压谱，瞬态表面光电压响应，光电化学It曲线及其产生的评价OH量的Al-O的特殊photoactivities桥接GC ₃ Ñ ₄ /的α-Fe ₂ ö _3个纳米复合材料通过构建所述gC归因于显著促进电荷转移和分离₃ Ñ ₄ /的α-Fe ₂ ö ₃异质结和Al-O桥。而且，已经证实该光催化剂的电荷转移和分离遵循Z方案机理，这由用于CO ₂转化的单波长光电流作用谱和单波长光活性所支持。此外，光催化CO ₂的机理通过电化学还原和光催化实验，特别是对^₁₃ CO ₂和D ₂ O同位素的光催化实验，已经清楚地说明了这种转化，即作为中间基团产生的H原子将主要诱导CO ₂转化为CO和CH ₄。