通过蒸汽裂解层状钛酸盐K2Ti2O5减少水热合成暴露（001）面TiO2的尿素消耗

IF 5.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-07-11 DOI:10.1016/j.materresbull.2025.113660

Wenjing Xiang , Anwen Lv , Rui Sun , Chang Liu

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引用次数: 0

摘要

虽然在水热处理钛酸盐中使用尿素代替HF是合成高暴露（001）面TiO2的更环保的方法，但该方法仍然需要大量的尿素消耗。在这项研究中，我们证明了与直接酸洗K2Ti2O5 （2TiH, 19 m²/g）得到的钛酸相比，蒸汽预处理K2Ti2O5然后酸洗（得到钛酸2TiH- mp， 225 m²/g）在随后的水热处理中显著减少了尿素需求。在0.5 M尿素中，在200°C下水热处理24小时，得到二氧化钛，2TiH- mp的面暴露率为47%(001)，而2TiH的面暴露率为27%。2tih - mp衍生的晶体在亚甲基蓝降解中表现出增强的光催化活性，最佳样品达到68%（001）面曝光。这种性能的增强归因于（001）表面上丰富的不饱和Ti5C位点，这些位点是吸附和降解过程的高活性中心。

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Reducing urea consumption in hydrothermal synthesis of TiO2 with exposed (001) facets via steam splitting of layered titanate K2Ti2O5

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Reducing urea consumption in hydrothermal synthesis of TiO2 with exposed (001) facets via steam splitting of layered titanate K2Ti2O5

While using urea as a substitute for HF in the hydrothermal treatment of titanates represents a more environmentally benign approach for synthesizing TiO₂ with high exposure of (001) facets, this method still necessitates substantial urea consumption. In this study, we demonstrate that pretreatment of K₂Ti₂O₅ with steam treatment followed by acid washing (yielding titanic acid 2TiH-mP, 225 m²/g) significantly reduces urea requirements during subsequent hydrothermal processing, compared to titanic acid obtained through direct acid washing of K₂Ti₂O₅ (2TiH, 19 m²/g). Hydrothermal treatment in 0.5 M urea at 200 °C for 24 h yielded titanium dio1xide with 47 % (001) facet exposure from 2TiH-mP, versus 27 % from 2TiH. The 2TiH-mP-derived crystals exhibited enhanced photocatalytic activity in methylene blue degradation, with optimal samples achieving 68 % (001) facet exposure. This performance enhancement is attributed to abundant unsaturated Ti5C sites on the (001) facets, which serve as highly active centers for adsorption and degradation processes.

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.