Functionalized layered double hydroxide applied to heavy metal ions absorption: A review

Nanotechnology Reviews

article

Zhen Tang¹  Zedong Qiu¹  Shuang Lu¹  Xianming Shi³ 

[1]Department of Civil Engineering Materials, School of Civil Engineering, Harbin Institute of Technology

[2]Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology

[3]Laboratory for Advanced & Sustainable Cementitious Materials, Department of Civil and Environmental Engineering, Washington State University, United States of America

关键词: LDH;    intercalation;    surface modification;    loading on substrates;    selective absorption;    wastewater;   

DOI  :  10.1515/ntrev-2020-0065

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

The use of functional material can help mitigate the pollution by heavy metals, which presents an array of risks to human production and life. This work provides a comprehensive review of the current knowledge on functionalized layered double hydroxide (LDH) as a heavy metal absorption material, by synthesizing the information from a total of 141 relevant publications published since 2005. LDH provides a potentially highly efficient method to adsorb heavy metal ions, which is simple to prepare and of low cost. The lack of functional groups and structural components of pristine LDH, however, limits the absorption capacity and widespread applications of LDH. Through intercalation, surface modification, or loading on substrates, functional groups or structural components are introduced into the pristine LDH to prepare functionalized LDH. In this process, the hydroxyl group and the valence state of [Mg(OH) 6 ] octahedrons play a crucial role. Functionalized LDH can be endowed with selective absorption capacity and enhanced stability and recyclability. After adsorbing heavy metal ions, functionalized LDH can be readily separated from the liquid phase. These aspects are discussed, along with the structure and composition, shape and size, and synthesis methods and research tools of LDH. This work concludes with the discussion of preparation and utilization and a look to the future in terms of identified research needs regarding the preparation, use, and recycling (or upcycling) of economical and environmental-friendly LDH.

【 授权许可】

CC BY