Enhanced photocatalytic performance of direct Z-scheme g-C3N4-TiO2 photocatalysts for the decomposition of formaldehyde in air
Enhanced photocatalytic performance of direct Z-scheme g-C3N4-TiO2 photocatalysts for the decomposition of formaldehyde in air
复制标题
增强直接Z型g-C3N4-TiO2光催化剂分解空气中甲醛的光催化性能
DOI：
10.1039/c3cp53131g
复制
发表时间：
2013-01-01
影响因子：
3.3
通讯作者：
Xiao, Wei
中科院分区：
文献类型：
--
作者：
Yu, Jiaguo;Wang, Shuhan;Xiao, Wei
甲醛（HCHO）是一种主要的室内污染物，长期暴露于HCHO中可能会导致鼻肿瘤和皮肤刺激等健康问题。光催化氧化被认为是最有前途的甲醛降解方法。本文首次以廉价的P25和尿素为原料，通过简单的煅烧路线制备了不含电子介体的直接g-C3 N4-TiO 2 Z型光催化剂。通过光催化氧化分解空气中的甲醛，评价了所制备样品的光催化活性。结果表明，所制备的Z型光催化剂的光催化活性与g-C3 N4的含量密切相关。在最佳g-C3 N4含量（本研究中的样品U100）下，HCHO分解的表观反应速率常数为7.36 x 10（-2）min（-1），超过纯P25的表观反应速率常数（3.53 x 10（-2）min（-1））2.1倍。增强的光催化活性可以归因于g-C3 N4-TiO 2 Z-方案光催化剂的形成，这导致光生载流子的有效空间分离。考虑到制备方法的简单性，这项工作将为室内空气净化的高性能Z方案光催化剂的设计提供新的见解。
Formaldehyde (HCHO) is a major indoor pollutant and long-term exposure to HCHO may cause health problems such as nasal tumors and skin irritation. Photocatalytic oxidation is considered as the most promising strategy for the decomposition of HCHO. Herein, for the first time, a direct g-C3N4-TiO2 Z-scheme photocatalyst without an electron mediator was prepared by a facile calcination route utilizing affordable P25 and urea as the feedstocks. Photocatalytic activities of the as-prepared samples were evaluated by the photocatalytic oxidation decomposition of HCHO in air. It was shown that the photocatalytic activity of the prepared Z-scheme photocatalysts was highly dependent on the g-C3N4 content. At the optimal g-C3N4 content (sample U100 in this study), the apparent reaction rate constant was 7.36 x 10(-2) min(-1) for HCHO decomposition, which exceeded that of pure P25 (3.53 x 10(-2) min(-1)) by a factor of 2.1. The enhanced photocatalytic activity could be ascribed to the formation of a g-C3N4-TiO2 Z-scheme photocatalyst, which results in the efficient space separation of photo-induced charge carriers. Considering the ease of the preparation method, this work will provide new insights into the design of high-performance Z-scheme photocatalysts for indoor air purification.