Biofuels institute, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.
Biofuels institute, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.
J Hazard Mater. 2022 Jun 5;431:128596. doi: 10.1016/j.jhazmat.2022.128596. Epub 2022 Feb 26.
Widespread application of synthetic dyes could generate colored wastewaters causing a range of serious environmental problems. Due to the complex nature of effluents from textile industries, it is difficult to obtain satisfactory treatment of dyes-contaminated wastewater using one single method. Biohybrids coupling of photocatalysts and biocatalysts have great potential in environmental purification. However, how to select suitable organisms and enhance the hybrid's catalytic activities remain challenging. Here, a novel biohybrid system (Clostridium thermocellum-CdS), created for light-driven biodecolorization under thermophilic treatment by using non-photosynthetic microorganism C. thermocellum self-photosensitized with CdS nanoparticles was established. The biohybrids exhibited remarkable decolorization effects on triphenylmethane dyes. The highest decolorization rate was 0.206 min. More importantly, enhanced catalytic activities of cadmium sulfide (CdS)-based biohybrids by controlling the particle sizes of semiconductors were demonstrated. Biohybrids systems (Clostridium thermocellum-CdS) through the self-precipitation of CdS with different particle sizes not only showed dramatic changes in the optical properties but also exhibited a very different decolorization rate. This work can not only further broaden targeted applications of CdS-based biohybrids but also demonstrate a promising route for improving biohybrids corresponding photocatalytic capabilities through in situ precipitation CdS with different particle sizes.
广泛应用合成染料会产生有色废水，从而引发一系列严重的环境问题。由于纺织工业废水的性质复杂，单一方法很难获得令人满意的染料污染废水处理效果。光催化剂和生物催化剂的生物杂化在环境净化方面具有巨大的潜力。然而，如何选择合适的生物和提高杂化体的催化活性仍然具有挑战性。在这里，我们建立了一种新型的生物杂化体系（Clostridium thermocellum-CdS），用于利用非光合微生物 Clostridium thermocellum 自身被 CdS 纳米粒子敏化，在嗜热条件下进行光驱动的生物降解。该生物杂化体对三苯甲烷染料表现出显著的脱色效果。最高脱色率为 0.206 min。更重要的是，通过控制半导体的颗粒尺寸，展示了基于硫化镉（CdS）的生物杂化体的增强催化活性。通过不同颗粒尺寸的 CdS 自沉淀制备的生物杂化体（Clostridium thermocellum-CdS）不仅在光学性质上发生了显著变化，而且表现出非常不同的脱色率。这项工作不仅可以进一步拓宽基于 CdS 的生物杂化体的靶向应用，而且还展示了通过不同颗粒尺寸的原位沉淀 CdS 来提高生物杂化体相应光催化能力的有前途的途径。
