Adsorption of Pd(II) ions by electrospun fibers with effective adsorption sites constructed by N, O atoms with a particular spatial configuration: Mechanism and practical applications

Min Li; Mingyue Wang; Lin Zhang; Yuzhu Fan; Liang Xu; Zhiyuan Ma; Zhidong Wen; Haichao Wang; Nianshou Cheng

doi:10.1016/j.jhazmat.2023.132014

Adsorption of Pd(II) ions by electrospun fibers with effective adsorption sites constructed by N, O atoms with a particular spatial configuration: Mechanism and practical applications

J Hazard Mater. 2023 Sep 15:458:132014. doi: 10.1016/j.jhazmat.2023.132014. Epub 2023 Jul 6.

Authors

Min Li¹, Mingyue Wang¹, Lin Zhang¹, Yuzhu Fan¹, Liang Xu², Zhiyuan Ma³, Zhidong Wen⁴, Haichao Wang⁵, Nianshou Cheng⁶

Affiliations

¹ Department of Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, PR China.
² School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan, 243032, PR China.
³ State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals, Guangzhou 510650, PR China.
⁴ School of Resources and Environmental Engineering, Ludong University, Yantai, Shandong 264025, PR China.
⁵ School of Resources and Environmental Engineering, Ludong University, Yantai, Shandong 264025, PR China. Electronic address: limin1406@163.com.
⁶ College of Chemistry and Materials Engineering, Anhui Science and Technology University, Bengbu, Anhui 233030, PR China. Electronic address: syj8905@126.com.

PMID: 37423131
DOI: 10.1016/j.jhazmat.2023.132014

Abstract

The separation and recovery of palladium from electronic waste (e-waste) are of great significance as they can alleviate environmental pollution and avoid resource loss. Herein, a novel nanofiber modified by 8-hydroxyquinoline (8-HQ-Nanofiber) with adsorption sites co-constructed by N and O atoms of hard bases was fabricated, which has good affinity properties for the Pd(II) ions belonging to soft acid in the leachate of e-waste. The adsorption mechanism of 8-HQ-Nanofiber for Pd(II) ions was revealed from the perspective of molecular level relied on a series of characterizations, such as FT-IR, ss-NMR, Zeta potential, XPS, BET, SEM and DFT. The adsorption of Pd(II) ions on 8-HQ-Nanofiber reached equilibrium within 30 min and the maximum uptake capacity was 281 mg/g at 318.15 K. The adsorption behavior of Pd(II) ions by 8-HQ-Nanofiber was described by the pseudo-second-order and Langmuir isotherm models. The 8-HQ-Nanofiber exhibited relatively good adsorption performance after 15 times of column adsorption. Finally, based on hard and soft acids and bases (HSAB) theory, a strategy to regulate the Lewis alkalinity of adsorption sites by specific spatial structures is proposed, which provides a new direction for the design of adsorption sites.

Keywords: Adsorption; Electrostatic spinning; Nanofiber; Pd(II) ions.