Abstract To hinder the recombination process of light-induced electron-hole pairs, as well as extending the absorption edge to visible light region, TiO2 was co-doped by lanthanum (La) and nitrogen (N) elements, and immobilized onto diatomite (LNT/D) via a facile sol-gel method. Its physicochemical properties such as light absorption range, phase structure and morphology were systematically analyzed. The synergy between two dopants, as well as diatomite and TiO2 were studied. The introduction of La and N narrowed the bandgap of TiO2 and thus extended its light absorption range to visible light region. The adsorption capability of carrier diatomite promoted the overall photodegradation efficiency by attracting target pollutants around photocatalyst TiO2. The photoactivity of LNT/D was evaluated by degradating Rhodamine B (RhB) under visible light. Its photocatalytic mechanism was investigated. LNT/D also indicated excellent photo-stability and recyclability, showing its great potential to be applied in wastewater remediation process.

中文翻译：

---

La和N共掺杂TiO 2 /硅藻土复合材料的光催化活性增强

摘要 为了阻碍光致电子-空穴对的复合过程，并将吸收边扩展到可见光区，TiO2 共掺杂镧 (La) 和氮 (N) 元素，并固定在硅藻土 (LNT) 上。 /D) 通过简便的溶胶-凝胶方法。对其光吸收范围、相结构和形貌等理化性质进行了系统分析。研究了两种掺杂剂以及硅藻土和二氧化钛之间的协同作用。La和N的引入缩小了TiO2的带隙，从而将其光吸收范围扩展到可见光区域。载体硅藻土的吸附能力通过吸引光催化剂 TiO2 周围的目标污染物来提高整体光降解效率。通过在可见光下降解罗丹明 B (RhB) 来评估 LNT/D 的光活性。对其光催化机理进行了研究。LNT/D 还表现出优异的光稳定性和可回收性，显示出其在废水修复过程中的巨大应用潜力。