Simultaneous adsorption of Cu2+ and Cr (VI) using HDTMA-modified zeolite: isotherm, kinetic, mechanism, and thermodynamic studies
Abstract
Abstract Clinoptilolite modified by hexadecyltrimethylammonium bromide (HDTMA-Br) was used to simultaneously remove copper and hexavalent chromium from aqueous solutions. The surface properties of HDTMA-modified natural zeolite (HMNZ) were characterized using scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), zeta potential and Fourier transform infrared spectroscopy (FTIR) techniques. SEM images showed that surfactant is adsorbed on the surface of the zeolite, which is confirmed by the FTIR result. The results from BET demonstrated a reduction in the specific surface area and pore volume due to the presence of surfactant molecules on the external surface of zeolite. The effects of important parameters on adsorption efficiency of Cu2+ and Cr (VI) were evaluated by Box-Behnken design. The Langmuir isotherm provided the best fit to the equilibrium data of Cu2+ and Cr (VI), with the maximum adsorption capacity of 0.068 and 0.0093(mmol), respectively. The film diffusion mechanism was found to control the mass transfer, and the adsorption reactions were computed as endothermic for Cu2+ ( = 17.58 kJ) and exothermic for Cr (VI) ( −26.18 kJ). The results indicated that surfactant modification changes the surface charge of zeolite from negative to positive, which makes zeolites economic adsorbents with the possibility of simultaneous removal of cations and oxyanions. The results also showed that the removal efficiency of Cr (VI) increases in the presence of copper cations due to there being more positive sites on the adsorbent surface.
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The reduction in surface area and pore volume could be because of the blocking of pore channels of natural zeolites with surfactant.
“The reduction in the surface area and pore volume could be because of the blocking of pore channels of natural zeolites with surfactant (Mendoza-Barrón et al., 2010;Zekavat et al., 2020;Zeng et al., 2010).”
From Adsorption of heavy metals on natural zeolites: A review (2023) · cites this paper as Zekavat et al., 2020
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Adsorption of heavy metals on natural zeolites: A review
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“The reduction in the surface area and pore volume could be because of the blocking of pore channels of natural zeolites with surfactant (Mendoza-Barr ´ on et al., 2010; Zekavat et al., 2020; Zeng et al., 2010).”
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- Authors
- Zekavat, S. R., Raouf, F., & Talesh, S. S. A.
- Affiliations
- University of Guilan (IR)
- Corresponding author
- Raouf, Fereshteh
- Venue
- Water Science and Technology
- Publisher
- IWA Publishing
- Published
- 2020-09-18
- Volume
- 82
- Issue
- 9
- Pages
- 1808-1824
- ISSN
- 0273-1223 (ISSN-L)
- 1996-9732
- OpenAlex
- W3092326578
- Cited by
- 25
- References
- 41
- Citations by year
- 2026: 3 · 2025: 6 · 2024: 5 · 2023: 8 · 2022: 3
- FWCI
- 0.84
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Water Science & Technology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Environmental Science › Waste Management and Disposal › Chemical Synthesis and Characterization
- Physical Sciences › Chemistry › Inorganic Chemistry › Zeolite Catalysis and Synthesis
- Keywords
- simultaneous adsorption, copper removal, hexavalent chromium removal, clinoptilolite, cetyltrimethylammonium bromide, surfactant-modified zeolite, Langmuir isotherm, film diffusion, adsorption thermodynamics, surface charge, heavy metal removal from water
- MeSH terms
- Adsorption, Chromium, Hydrogen-Ion Concentration, Kinetics, Thermodynamics, Water Pollutants, Chemical, Spectroscopy, Fourier Transform Infrared, Zeolites
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