：Rhodium oxide quantum dots (ROQDs) and carbon quantum dots (CQDs) were controllably assembled on [Bi₂O₂]²⁺ slices and [WO₄]^2- slices of thin layered Bi₂WO₆, respectively, to construct broad spectrum response ROQDs/Bi₂WO₆/CQDs heterojunctions by a two-step process including photodeposition ROQDs and hydrothermal anchoring CQDs. 0.1%ROQDs/Bi₂WO₆/4.2%CQDs exhibited optimized photoactivity for 4-chlorophenol (4-CP) degradation (K_app = 2.15×10^-2 min^-1) under the visible light (420 nm﹤λ﹤800 nm) irradiation, about 9.5 times as that of pristine Bi₂WO₆ (K_app = 2.26 ×10^-3 min^-1). ROQDs-modifying played a crucial role in enhancing photoactivity under the visible light of λ > 420 nm, whereas CQDs- modifying played a decisive role under the visible light of λ > 550 nm. Built-in electric fields at the ROQDs/Bi₂WO₆ and CQDs/Bi₂WO₆ interfaces and the intimate interfaces as charge transfer channels produced significant synergetic effects on promoting charge carrier separation and reducing charge transfer resistance. More importantly, the oxidative power of h⁺ was enhanced by forming Z-scheme ROQDs/Bi₂WO₆ heterojunction, thus making more contribution to 4-CP degradation by both h⁺ and ·OH than ·O^2-. In addition, ROQDs and CQDs co-modification further improved light harvesting capacity, enlarged specific surface, pore volume, and average pore diameter, as well as increased surface hydroxyl and absorbed oxygen. Enhanced visible light photoactivity was attributed to the cooperation of all above factors. This work provides a viable avenue to develop efficient double heterojunction photocatalysts for environment purification and solar energy conversion.

：将氧化铑量子点（ROQDs）和碳量子点（CQDs）分别可控地组装在薄层Bi ₂ WO _6的[Bi ₂ O ₂ ] ²⁺切片和[WO ₄ ] ²切片上，以构建宽光谱ROQDs / Bi ₂ WO ₆ / CQDs异质结的反应通过两步过程进行，包括光沉积ROQDs和热液锚定CQDs。0.1％ROQDs / Bi ₂ WO ₆ /4.2%CQDs对4-氯苯酚（4-CP）降解表现出优化的光活性（K _app = 2.15×10 ^-2 min ^-1 ）在可见光（420  nm ﹤λ﹤800  nm）照射下，约为原始Bi ₂ WO _6的9.5倍（K _app = 2.26×10 ^-3  min ^-1）。在λ> 420  nm的可见光下，ROQDs修饰在增强光活性中起关键作用，而在λ> 550  nm的可见光下，ROQDs修饰起决定性作用。ROQDs / Bi ₂ WO ₆和CQDs / Bi ₂ WO _6的内置电场界面和紧密界面作为电荷转移通道，在促进电荷载流子分离和降低电荷转移阻力方面产生了显着的协同作用。更重要的是，通过形成Z型ROQDs / Bi ₂ WO ₆异质结增强了h ⁺的氧化能力，因此，与⁺ O ^2-相比，h ⁺和·OH对4-CP降解的贡献更大。。此外，ROQD和CQD的共改性进一步提高了光收集能力，扩大了比表面积，孔体积和平均孔径，并增加了表面羟基和吸收的氧气。可见光光活性增强归因于上述所有因素的共同作用。这项工作为开发用于环境净化和太阳能转化的高效双异质结光催化剂提供了可行的途径。