TiO2 photocatalysis has gained attention as a cost‐effective way of degrading contaminants. However, it relies on UV excitation and experiences rapid carrier recombination. To address these drawbacks, novel xylan‐based carbon dots@hydrogenated TiO2 (CDs@TiO2‐x) composited by direct Z‐scheme heterojunction is fabricated as a visible light‐driven photocatalytic material, which broadens the range of light absorption to visible light and suppresses the recombination of photogenerated carriers. The spindle‐shaped CDs@TiO2‐x has C/N/O/S groups, positive charges, and oxygen vacancies on its surface, and can degrade 89% of methylene blue and 87% of methyl orange within 90 min, and 99% of rhodamine B within 60 min in visible light. It also eradicates 99.9% of E. coli in 2 h and 97.1% of S. aureus in 2.5 h. These performances surpass CDs and TiO2‐x, and exhibit advantages in similar composite materials. The degradation pathways of dyes and the specific antibacterial processes induced by ROS are thoroughly investigated through LC‐MS testing and related enzyme activity assays. DFT calculations study the role of oxygen vacancies, heterojunction mechanism, and catalytic sites. This study has developed a novel nanocomposite with applications in both dye degradation and sterilization, offering insights for multifunctional materials based on photocatalysis and heterojunction.

中文翻译：

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直接Z型木聚糖基碳点@TiO2-x纳米复合材料用于可见光驱动光催化染料降解和抗菌

二氧化钛2光催化作为一种​​经济高效的污染物降解方法而受到关注。然而，它依赖于紫外线激发并经历快速的载流子复合。为了解决这些缺点，新型木聚糖基碳点@氢化TiO2(CD@TiO2-x）由直接Z型异质结复合而成的可见光驱动光催化材料，将光吸收范围扩大到可见光并抑制光生载流子的复合。纺锤形CDs@TiO2-x表面具有C/N/O/S基团、正电荷和氧空位，可见光下90分钟内可降解89%的亚甲基蓝和87%的甲基橙，60分钟内可降解99%的罗丹明B 。它还消除了 99.9%大肠杆菌2 小时内 97.1%金黄色葡萄球菌2.5小时内。这些性能超越了 CD 和 TiO2-x，并在同类复合材料中表现出优势。通过 LC-MS 测试和相关酶活性测定，深入研究了染料的降解途径和 ROS 诱导的特定抗菌过程。 DFT 计算研究氧空位、异质结机制和催化位点的作用。这项研究开发了一种新型纳米复合材料，可用于染料降解和灭菌，为基于光催化和异质结的多功能材料提供了见解。