文章信息/Info

Title:

Research Progress on Synthesis of Layered Double Hydroxides(LDHs) and Their Applications in Photocatalysis

作者:

李海金1; 韓秋彤2; 賈虎1; 周勇2; 鄒志剛2

1. 安徽工業大學數理科學與工程學院，安徽 馬鞍山 243002

2. 南京大學物理學院 環境材料與再生能源研究中心 江蘇省納米技術重點實驗室，江蘇 南京 210093

Author(s):

LI Haijin1; HAN Qiutong2; JIA Hu1; ZHOU Yong2; ZOU Zhigang2

1. School of Mathematics and Physics, Anhui University of Technology, Ma�餫nshan 243002, China

2. Eco�睲aterials and Renewable Energy Research Center, Jiangsu Key Laboratory for Nano Technology,School of Physics, Nanjing University, Nanjing 210093, China

關鍵詞:

層狀雙金屬氫氧化物; 合成方法; 光催化; 光電催化; 展望

Keywords:

layered double hydroxides;  synthesis methods;  photocatalysis;  photoelectrocatalysis;  outlook

DOI:

10.7502/j.issn.1674-3962.2019.02.02

文獻標志碼:

A

摘要:

層狀雙金屬氫氧化物(layered double hydroxides, LDHs)具有層板化學組分可調、層間陰離子易交換、插層分子種類多、比表面積大等優點，可作為理想的光催化劑，具有重要的應用前景。LDHs光催化劑的制備方法主要有共沉淀法、水熱法、離子交換法等，在此基礎上，探討了LDHs光催化材料在光催化產氫或產氧、光催化還原CO2、光降解有機污染物以及光電催化等領域的應用。盡管LDHs材料的光催化應用研究取得了良好的進展，但是LDHs光催化材料的催化活性仍然較低，實現太陽能的高效利用及光催化反應過程的高轉化率仍然具有很大的挑戰性。針對這一困境，可以采取以下措施：① 開發新的納米材料合成技術，實現LDHs材料的成分、微結構的可控合成；② 發展原位表征技術，直觀研究光催化反應的微觀動態過程和相關規律；③ 構建新穎的LDHs基光催化材料，使其光子吸收與利用率、光生載流子分離效率與表面催化反應效率協同提高，獲得較高光催化效率。

Abstract:

Layered double hydroxides (LDHs) photocatalysts have emerged as one of the most ideal photocatalysts, owing to their flexibility in composition of hydroxide layer, facile exchange ability of interlayer anions and a range of intercalation molecule, and high specific surface areas. LDHs photocatalysts were prepared by coprecipitation, hydrothermal method, ion exchange route, and other techniques. As one of the promising photocatalysts, the research progress and application of LDHs photocatalysts in photocatalytic and/or photoelectrocatalytic O2 generation and H2 evolution, photoreduction of CO2, and photodegradation of organic pollutants are reviewed. Despite the many recent advances in photocatalytic performance of LDHs, the low photocatalytic efficiency of LDHs is always a key factor and great challenge to restrict the practical application of this technology. For high conversion efficiency of photocatalytic reaction, some strategies may be adoped to enhance the photocatalytic efficiencies of LDHs: ① development of new synthesis methods to controllably produce LDHs with an optimum compositions and nanostructures; ② exploration of advanced in�瞫itu tehniques to directly characterize microdynamic reaction process and correlations between photocatalytic properties and influence factor for LDHs photocatalysts under reaction condition; ③ design of novel LDHs�瞓ased photocatalysts to achieve high photocatalytic efficiency by the aid of synergistic enhancement in photon absorption and utilization, the separation of photogenerated carriers and surface photocatalytic reaction efficiency.