ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Modification of SBA-16 surface by -NH₂ group and its application as adsorbent

S. Soleymani, M. Razavi Mehr, M. H. Fekri, and F. Saki

Department of Chemistry, Faculty of Basic Sciences, Ayatollah Borujerdi University, Borujerd, Iran

E-mail: m.h.fekri@abru.ac.ir

Received: 2 February 2023  Accepted: 30 April 2023

Abstract:

In this research, silicate nanomesopore SBA-16 was synthesized and functionalized by NH₂ group to increase its efficiency, and the purpose of preparing SBA-16-NH₂ was to use it to remove the color pollutant methylene blue. The SBA-16-NH₂ mesoporous structure was analyzed by FTIR, XRD, SEM and TEM. Then, important parameters for pollutant removal were investigated with the help of experiment design software. The results of the predicted experiments demonstrate that the highest absorption of methylene blue can be seen in pH = 2.04, temperature 50 °C, contact time 10 min, initial adsorbent concentration 10 ppm and amount of adsorbent 0.04 g. In optimal conditions, SBA-16-NH₂ adsorbent could remove 98.58% of methylene blue. Also, adsorption isotherms, thermodynamics and kinetics were studied. The results show that the adsorption follows the Langmuir isotherm and is thermodynamically exothermic and spontaneous. The adsorption kinetics is a function of the pseudo-first-order model.

Keywords: Nanomesoporous SBA-16-NH2; Colored pollutants; Methylene blue pigment; Experiment design

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-023-02849-6

Chemical Papers 77 (9) 5129–5141 (2023)