Preparation of C/TiO2-SO42- and their water splitting performance

doi:10.11949/j.issn.0438-1157.20170308

Abstract

Abstract:

The SO₄^2- modified TiO₂(25) and the unmodified TiO₂(150) have been prepared by sol-gel method via controlling the amount of introduced deionized water. Two series of C modified C_x/TiO₂(25) and C_x/TiO₂(150) samples were obtained by impregnating the TiO₂(25) and TiO₂(150) in carbon dots solution with various concentrations. The lattice spacing, crystalline, light absorption, pore size, specific surface area and element composition of the prepared catalysts were characterized by TEM, XRD, FT-IR, UV-Vis, BET and XPS. The results indicated that compared with the unmodified TiO₂(150), the SO₄^2- modified TiO₂(25) exhibited a distinct red shift phenomenon and broader visible light response for the light absorption. Moreover, the O_ads/O_latt ratios can be improved distinctly for the TiO₂(25) when the carbon dots were introduced. The catalytic performance showed that the addition of C can enhance the corresponding photocatalytic activity.

Key words: SO₄^2-, composites, nanomaterials, catalyst, carbon dots, photocatalytic, hydrogen production

摘要：

通过溶胶-凝胶制备过程中水含量控制，分别获得了硫酸根修饰的TiO₂（25）和无修饰的TiO₂（150）两种二氧化钛载体。在两种载体上，通过浸渍法引入不同浓度的碳点胶体，获得了系列不同C含量的C_x/TiO₂（25）和C_x/TiO₂（150）催化剂。利用TEM、XRD、FT-IR、UV-Vis、BET、XPS等表征分析了催化剂的表面形貌、晶格间距、晶型结构、光吸收、孔结构及元素组成。结果显示：相对于无硫酸根修饰的TiO₂（150）催化剂，硫酸根修饰的TiO₂（25）催化剂的光吸收发生显著红移，展示了更宽的可见光响应；对于TiO₂（25）样品，C的引入可提高其O_ads/O_latt比值。催化性能研究显示，C的引入可以提高其光催化活性。

关键词: 硫酸根, 复合材料, 纳米材料, 催化剂, 碳点, 光催化, 制氢

CLC Number:

O611

TENG Xuegang, YANG Renchun, REN Chao, LIU Lulu, WANG Mingxing. Preparation of C/TiO₂-SO₄^2- and their water splitting performance[J]. CIESC Journal, 2017, 68(11): 4414-4422.

滕雪刚, 杨仁春, 任超, 刘璐璐, 汪明星. C/TiO₂-SO₄^2-的制备及其光解水性能[J]. 化工学报, 2017, 68(11): 4414-4422.

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Preparation of C/TiO₂-SO₄^2- and their water splitting performance

C/TiO₂-SO₄^2-的制备及其光解水性能

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