TiO₂ nanorods (T) were combined with a narrow band gap semiconductor β-Bi₂O₃ (B) to form a heterojunction, which makes it possible for TiO₂ to become active as a photocatalyst also under visible light illumination. To further increase the photocatalytic activity of TiO₂ + Bi₂O₃/(BiO)₂CO₃ (TB) composite, we used a hydrothermal procedure to link it with reduced graphene oxide (rGO). Structural, surface and electronic properties of the obtained catalysts were analyzed and correlated to their performance in photocatalytic oxidation of aqueous bisphenol A (BPA) solution conducted in a batch reactor under visible light illumination. XRD, FTIR, UV–vis DR spectroscopy and photocurrent measurements of visible light illuminated TB composite catalyst clearly showed that (i) β-Bi₂O₃ acts as a photosensitizer for TiO₂ and (BiO)₂CO₃ present in the TB composite, (ii) holes (h⁺) are photo-generated in valence band (VB) of β-Bi₂O₃ and due to the β-Bi₂O₃/TiO₂ heterojunction transferred into VB of TiO₂, (iii) p-n junction between β-Bi₂O₃ and TiO₂ allows the photo-generated electrons (e⁻) in the conduction band (CB) of β-Bi₂O₃ to transfer to TiO₂, and (iv) p-n junction between β-Bi₂O₃ and (BiO)₂CO₃ allows the photo-generated electrons in the conduction band of β-Bi₂O₃ to transfer to (BiO)₂CO₃. This means that more charge carriers are available to participate in the catalytic visible-light triggered oxidation process for the degradation of organic pollutants dissolved in water. The highest photocurrent density was measured for multi-phase TBR (TB + rGO) composite, which indicates that visible-light generated charge carriers in TB composite are injected into the reduced graphene oxide. The latter acts as a web for charge carrier percolation and suppresses the recombination of electron-hole pairs, thus resulting in improved catalytic activity of TBR. The results of UV–vis DR spectroscopy and photocurrent density measurements were entirely in line with the results of photocatalytic oxidation of water dissolved bisphenol A (BPA) in batch reactor under visible light illumination.

的TiO ₂纳米棒（T）具有窄带隙半导体β-Bi系合并₂ ö ₃（B），以形成异质结，这使得它可能的TiO ₂作为光催化剂也下可见光照明被激活。为了进一步提高TiO ₂  + Bi ₂ O ₃ /（BiO）₂ CO ₃的光催化活性（TB）复合材料，我们使用了水热工艺将其与还原型氧化石墨烯（rGO）连接。分析了所得催化剂的结构，表面和电子性质，并将其与在可见光照射下在间歇反应器中进行的双酚A（BPA）水溶液的光催化氧化性能进行了关联。XRD，FTIR，紫外-可见可见光的DR光谱和光电流测量照射TB复合催化剂清楚地表明：（ⅰ）β-Bi系₂ ö ₃充当的TiO光敏剂₂和（生物）₂ CO ₃存在于TB复合，（ⅱ）空穴（h ⁺）在价带（VB）光生β-Bi系₂ ö ₃并且由于β-Bi系₂ ö ₃ /二氧化钛₂异质结转移到VB的TiO ₂，（ⅲ）p - ñ之间结β-Bi系₂ ö ₃和TiO ₂允许光生电子（e ^- ）在的导带（CB）β-Bi系₂ ö ₃转移到的TiO ₂，和（iv）p - ñ β-Bi系之间结₂ ö ₃和（生物）₂ CO ₃允许在导带中的光生电子β-的Bi ₂O ₃转移至（BiO）₂ CO ₃。这意味着更多的载流子可用于参与催化可见光触发的氧化过程，以降解溶解在水中的有机污染物。测量了多相TBR（TB + rGO）复合材料的最高光电流密度，这表明TB复合材料中可见光产生的电荷载流子被注入还原的氧化石墨烯中。后者充当用于电荷载流子渗滤的网并抑制电子-空穴对的复合，因此导致改善的TBR催化活性。紫外可见DR光谱和光电流密度测量的结果与可见光照射下间歇反应器中水溶性双酚A（BPA）的光催化氧化结果完全一致。