Design and synthesis of a combined meso-adsorbent/chemo-sensor for extraction and detection of silver ions

Mahmoud A Hussein; Khalid A Alamry; Qana A Alsulami; Emad A Elshehy; Waleed A El-Said

doi:10.1016/j.saa.2022.120938

Design and synthesis of a combined meso-adsorbent/chemo-sensor for extraction and detection of silver ions

Spectrochim Acta A Mol Biomol Spectrosc. 2022 May 5:272:120938. doi: 10.1016/j.saa.2022.120938. Epub 2022 Jan 24.

Authors

Mahmoud A Hussein¹, Khalid A Alamry¹, Qana A Alsulami¹, Emad A Elshehy², Waleed A El-Said³

Affiliations

¹ Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
² Nuclear Materials Authority, P.O. Box 530, El Maadi, Cairo, Egypt. Electronic address: eelshehy@yahoo.com.
³ Chemistry Department, Faculty of Science, Assiut University, Assiut 71516, Egypt; College of Science, Department of Chemistry, University of Jeddah, P.O. Box 80327, Jeddah 21589, Saudi Arabia.

PMID: 35124483
DOI: 10.1016/j.saa.2022.120938

Abstract

We synthesized a new pH-dependent meso-captor/sensor for the visual monitoring and selective sequestering of Ag(I) ions from wastewater. The SBA-16 microspheres were successfully synthesized via a direct hydrothermal treatment through surfactant-assisted cooperative self-assembly. The meso-captor/sensor was designed via the direct immobilization of the chromogenic Acid Blue 90 (AB90) chelate into cubical large, open mesoporous SBA-16 carriers and investigate of its ability to detect and retain silver ions from aqueous solutions. Results show that the synthesized SBA-16 microspheres were retained after modification and the AB90 functional groups were immobilized hierarchically inside the mesopore channels. This was evidenced by the N₂ adsorption, X-ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared (FTIR), Scanning Electron Microscope (SEM), High-Resolution Transmission Electron Microscope (HR-TEM), and elemental analyses. Batch adsorption experiments were carried out and the effects of various parameters on Ag(I) ions removal and detection were determined. The optimum adsorption/detection of Ag(I) ions were recorded at a pH of 6.2 within 30 min with color change from a brilliant blue to a pale blue-gray. The spectral response for [SBA-16@AB90 → Ag(I)] complex showed a maximum reflectance at λ_max = 385 nm within 2.5 min response time (t_R); the LOD was close to 3.87 µg/L while the LOQ approached 12.83 µg/L, this was attributed to the concentration range at which a linear signal has been observed against Ag(I) analyte concentration (i.e., 5 to 1000 µg/L) at pH 6.2 with standard deviation (SD) of 0.077 (RSD% = 9.5 at n = 8).

Keywords: Adsorption; Porous materials; SBA-16 microspheres; Sensors; Silver; Wastewater.

MeSH terms

Adsorption
Ions
Silver* / chemistry
Spectroscopy, Fourier Transform Infrared
Wastewater* / chemistry

Substances

Ions
Waste Water
Silver