Tuning the structure of cerium-based metal-organic frameworks for efficient removal of arsenic species: The role of organic ligands

Md Nahid Pervez; Changxun Chen; Zongchen Li; Vincenzo Naddeo; Yaping Zhao

doi:10.1016/j.chemosphere.2022.134934

Tuning the structure of cerium-based metal-organic frameworks for efficient removal of arsenic species: The role of organic ligands

Chemosphere. 2022 Sep;303(Pt 1):134934. doi: 10.1016/j.chemosphere.2022.134934. Epub 2022 May 10.

Authors

Md Nahid Pervez¹, Changxun Chen², Zongchen Li², Vincenzo Naddeo³, Yaping Zhao⁴

Affiliations

¹ Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, and Institute of Eco-Chongming, Shanghai, 200241, China; Sanitary Environmental Engineering Division (SEED), Department of Civil Engineering, University of Salerno, via Giovanni Paolo II 132, 84084, Fisciano (SA), Italy.
² Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, and Institute of Eco-Chongming, Shanghai, 200241, China.
³ Sanitary Environmental Engineering Division (SEED), Department of Civil Engineering, University of Salerno, via Giovanni Paolo II 132, 84084, Fisciano (SA), Italy.
⁴ Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, and Institute of Eco-Chongming, Shanghai, 200241, China. Electronic address: ypzhao@des.ecnu.edu.cn.

PMID: 35561775
DOI: 10.1016/j.chemosphere.2022.134934

Abstract

The ability of organic ligands to change the structure of metal-organic frameworks (MOFs) in nature and influence their adsorption efficiency for arsenic species is enormous. The current work was designed to investigate the adsorption performance of cerium-based MOFs with tunable structures through the use of organic ligands (Ce-MOF-66 and Ce-MOF-808) towards arsenic species from water. The structural features of Ce-MOF-66 and Ce-MOF-808 with varying crystallinity, morphology, particle size, and surface area are considerably altered by organic ligands tuning, resulting in clearly distinct arsenate (As (V)) and arsenite (As (III)) adsorption capabilities. The experimental results showed that the Langmuir adsorption capacities of As (V) by Ce-MOF-66 and Ce-MOF-808 reached 355.67 and 217.80 mg/g, respectively, while for As (III) were 5.52 and 402.10 mg/g for Ce-MOF-66 and Ce-MOF-808, respectively. Except for the impact of PO₄^3- on As (V), co-existing ions had no significant influence on adsorption, illustrating the high selectivity. Furthermore, to understand the structure and adsorption mechanism, two adsorbents were characterized by powder X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, specific surface area, Fourier transform infrared and X-ray photoelectron spectroscopy, in which identified that unsaturated sites and ligand exchange were the main adsorption mechanisms of As (V) and As (III). Overall, this research presents a novel approach for developing high-performance Ce-derived MOFs adsorbents to capture arsenic species.

Keywords: Adsorption; Arsenic; Ce-MOF-66; Ce-MOF-808; MOFs; Organic ligands.

MeSH terms

Adsorption
Arsenic* / analysis
Cerium* / chemistry
Ligands
Metal-Organic Frameworks*
Water Pollutants, Chemical* / analysis

Substances

Ligands
Metal-Organic Frameworks
Water Pollutants, Chemical
Cerium
Arsenic