Sulfide adsorption by “green synthesized Fe3O4@ZnO core/shell” nanoparticles from aqueous solution and industrial rich amine solution: kinetic and equilibrium study

• Published in: International journal of environmental science and technology (Tehran) Vol. 20; no. 3; pp. 3101 - 3120
• Main Authors: Gonbadi, M., Sabbaghi, S., Saboori, R., Derakhshandeh, A., Narimani, M., Fatemi, A. Z.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.03.2023
• Subjects: Aquatic Pollution; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Science and Engineering; Original Paper; Soil Science & Conservation; Waste Water Technology; Water Management; Water Pollution Control; Adsorption; Green Fe; Rich amine solution; @ZnO core–shell nanoparticles; Sulfide removal; Co-precipitation; O
• ISSN: 1735-1472; 1735-2630
• DOI: 10.1007/s13762-023-04755-6

Hydrogen sulfide is very corrosive, poisonous, flammable and dangerous for environment. For making natural gas usable, hydrogen sulfide must be removed. In industry, alkaline solution such as amine is used for hydrogen sulfide removal process. So, finding an efficient method for amine regeneration is very important. In this research, for sulfide adsorption from aqueous solution and industrial rich amine solution, a green synthesized of Fe 3 O 4 @ZnO core/shell nanoparticles, with a spherical shape, high magnetic property and an average particle size of 39 nm were carried out by use of an Iranian green tea extraction as a reduction agent and characterized by UV–Vis spectroscopy, FTIR spectroscopy, XRD, FE-SEM, EDX, TEM and VSM analysis. For obtaining the highest amount of sulfide adsorption from solution, the effects of nanoparticle loading, initial concentration, time and initial pH were studied and the optimum condition was calculated by Design Expert software. An I-optimal method was utilized and the optimum condition of the process was nanoparticle loading 0.68%wt, initial concentration 800 ppm, time 17 min and initial pH 8, which was led to 99% removal of sulfide. Freundlich and Langmuir isotherm models were evaluated by adsorption equilibrium data, and as a result, Langmuir model illustrated the better conformity with the experimental data. In addition, the kinetic study is performed using two different models, pseudo-first-order and pseudo-second, and finally, pseudo-second-order selected as the best. Graphical abstract