文章信息/Info

Title:

Recent Advances on Bismuth Oxyiodide Photocatalysts

作者:

赫榮安; 曹少文; 余家國

武漢理工大學材料復合新技術國家重點實驗室；長沙學院環境光催化應用技術湖南省重點實驗室

Author(s):

HE Rongan;  CAO Shaowen;  YU Jiaguo

Wuhan University of Technology；Changsha University

關鍵詞:

碘氧化鉍; 光催化; 可見光

Keywords:

bismuth oxyiodide;  photocatalysis;  visible light;  heterojunction;  surface modification

DOI:

10.7502/j.issn.1674-3962.2017.01.03

文獻標志碼:

A

摘要:

鉍系半導體材料是一類重要的光催化材料，而碘氧化鉍是其中帶隙較窄的少數幾種之一，其光吸收波長范圍幾乎覆蓋全部可見光，具有較強的可見光響應性能。然而，這一優勢沒有得到充分利用，塊體碘氧化鉍的光催化性能并不理想，需要通過改性，使其光催化性能得到增強。由于碘氧化鉍的結構在鉍系光催化材料中非常具有代表性，幾乎所有鉍系光催化材料的改性增強策略都能用于碘氧化鉍的改性，故其相關研究對于鉍系光催化材料研究有較高的參考價值，引起了許多研究者的關注。為此，本文對近年來圍繞碘氧化鉍結構調控、形貌調控、復合和表面修飾等方面的改性研究進行綜述，分析和總結改性處理在促進光吸收、載流子傳輸與分離、調控帶隙結構等方面的作用機制，為新型可見光光催化材料的研究提供借鑒。

Abstract:

Bismuth-based semiconductors are an important family of photocatalysts, in which bismuth oxyiodide is one of those with narrow band gap and excellent visible light response. However, the photocatalytic activity of bulk bismuth oxyiodide is usually not satisfactory, and need to be improved by various strategies. The layered structure of bismuth oxyiodide is very typical in Bi-based photocatalysts, and almost all strategies for enhancing the photocatalytic performance of Bi-based photocatalysts are adaptable for bismuth oxyiodide. Hence the modification of bismuth oxyiodide is of significant referential importance for Bi-based photocatalysts, and has attracted numerous attentions. Herein, we overview the recent advances on the modification of bismuth oxyiodide in this paper, by using the strategies such as structure and morphology control, composite construction and surface modification. The relevant mechanism on promoting the light absorption, charge carrier migration and separation, and tuning the band structure were also summarized. It is believed that this review will provide a guidance for the development of highly efficient visible-light-driven photocatalysts.