The dual-function photocatalytic systems with a promising capability for hydrogen evolution and simultaneous pollutant degradation are surely a significant step towards waste-to-energy conversion goals. However, the performance of such photocatalysts is often limited by poor visible-light activity, charge separation and surface reverse reaction involving photogenerated electrons and radicals/intermediates. In this work, we report hydrothermal synthesis of novel Bi₇O₉I₃/B₄C (BIBC) heterojunction photocatalyst for advanced Norfloxacin antibiotic degradation with simultaneous hydrogen evolution under visible light. In particular, BIBC-30 heterojunction shows H₂ evolution rate of 812 μmol g⁻¹h⁻¹ with simultaneous 94.2% NFN removal which are much higher than bare B₄C (∼6 times) and Bi₇O₉I₃ (∼4 times). Under oxic/aerobic conditions too, a high 456.3 μmol g⁻¹h⁻¹H₂ evolution with nearly complete norfloxacin degradation was achieved. The low band gap of Bi₇O₉I₃ and presence of metallic Bi^o extends the absorbance to NIR region and B₄C enlarges the surface area of junction along with suppression of the back reaction. It was observed that BIBC heterojunction exhibits manifolds H₂ evolution rate with NFN as sacrificial agent (18.3% apparent quantum efficiency) is manifolds higher than pure water, methanol, triethanolamine and rhodamine B. An effective Z-scheme charge transfer facilitated by Bi^o is active in the intimately coupled heterojunction with suitably placed energy bands. This work shows that waste to energy conversion can be promisingly achieved by performing H₂ evolution and pollutant removal simultaneously.

双功能光催化系统具有良好的析氢和同时降解污染物的能力，无疑是朝着废物能源转化目标迈出的重要一步。然而，这种光催化剂的性能通常受到较差的可见光活性、电荷分离和涉及光生电子和自由基/中间体的表面逆反应的限制。在这项工作中，我们报告了新型 Bi ₇ O ₉ I ₃ /B ₄ C (BIBC) 异质结光催化剂的水热合成，用于高级诺氟沙星抗生素降解，同时在可见光下析氢。特别是，BIBC-30 异质结显示出812 μmol g ^{-1 的}H ₂析出率h ^-1同时具有 94.2% NFN 去除率，远高于裸 B ₄ C（~6 倍）和 Bi ₇ O ₉ I ₃（~4 倍）。在好氧/好氧条件下，也实现了高达 456.3 μmol g ^-1 h ^-1 H _{2 的}释放，并且几乎完全降解诺氟沙星。Bi ₇ O ₉ I ₃的低带隙和金属Bi ^{o 的}存在将吸收扩展到NIR 区域，B ₄ C 扩大了结的表面积，同时抑制了逆反应。观察到 BIBC 异质结表现出流形 H ₂以 NFN 作为牺牲剂的进化速率（18.3% 表观量子效率）比纯水、甲醇、三乙醇胺和罗丹明 B 高出许多倍。由 Bi ^o促进的有效 Z 型电荷转移在具有适当放置能量的紧密耦合异质结中是活跃的乐队。这项工作表明，通过同时进行 H ₂析出和污染物去除，可以很有希望地实现废物到能源的转换。