Nano-scale minerals in-situ supporting CeO2 nanoparticles for off-on colorimetric detection of L-penicillamine and Cu2+ ion

Jiajia Lian; Pei Liu; Qingyun Liu

doi:10.1016/j.jhazmat.2022.128766

Nano-scale minerals in-situ supporting CeO₂ nanoparticles for off-on colorimetric detection of L-penicillamine and Cu²⁺ ion

J Hazard Mater. 2022 Jul 5:433:128766. doi: 10.1016/j.jhazmat.2022.128766. Epub 2022 Mar 24.

Authors

Jiajia Lian¹, Pei Liu², Qingyun Liu³

Affiliations

¹ College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
² Analysis and Testing Center, Henan Polytechnic University, Jiaozuo 454000, China; College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
³ College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, China. Electronic address: qyliu@sdust.edu.cn.

PMID: 35364537
DOI: 10.1016/j.jhazmat.2022.128766

Abstract

Realizing the high value-added utilization of cheap minerals in environmental catalysis has important practical significance. Herein, four nano-scale minerals, namely halloysite (Hal) nanotubes, palygorskite (Pal) nanorods, and montmorillonite (Mon) and hydrotalcite (LDH) nanosheets, were selected for in-situ supporting CeO₂ nanoparticles (NPs) by a facile one-pot hydrothermal method. Among various nanocomposites (NCs), CeO₂/Pal behaves the highest peroxidase-like activity, attributing to larger surface area for uniformly dispersing CeO₂ NPs and more exposed active oxygen vacancy (O_vac) defects. A novel off-on colorimetric strategy was constructed for detecting toxic L-penicillamine (LPA) and Cu²⁺ ion with limit of detections (LODs) of 8.37 and 9.80 μM, respectively. Density functional theory (DFT) calculations show that the O_vac defect on CeO₂(111) surface can catalyze the heterolytic cleavage of H₂O₂ into H₂O and oxygen radical (•O), instead of being two hydroxyl radicals (•OH) on clean surface. It can also act as trapping site for O₂ and H₂O adsorption, improving the oxygen affinity and hydrophilicity of CeO₂/Pal. This study provides a feasible strategy for designing mineral-based nanozymes and an insight into the possible catalytic mechanism.

Keywords: Adsorption; CeO(2); Detection; Nano minerals; O(vac) defect.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Cerium*
Colorimetry / methods
Hydrogen Peroxide
Minerals
Nanoparticles*
Penicillamine

Substances

Minerals
Cerium
Hydrogen Peroxide
Penicillamine