Effectiveness of hematite derived from iron sand for adsorbing chromium (VI) – Characterization, isotherm models, and thermodynamics

• Autorzy: Susanti Evi , Fathimah Assyadatina , Zulti Fifia , Nafisyah Eva , Rosidah , Latief Sutanto

Identyfikatory

DOI

10.12911/22998993/195625

• Języki publikacji: EN

Abstrakty

EN

The industry has suffered major chromium wastewater issues. Chromium is a heavy metal that can threaten both nature and people’s health. Adsorption is a simple, environmentally friendly, and effective process for removing chromium from wastewater. Iron sand is an alternate adsorbent that can adsorb chromium. The iron sand in this research originated from Sukabumi, Indonesia, with a hematite content of 63.335%. The goal of this study is to evaluate the adsorption mechanism of hematite based on adsorbent weight, Cr(VI) initial concentration, pH of the solution, and contact time. This study was conducted experimentally throughout multiple phases. First, hematite was characterized using XRD, BET, FTIR and XRF to assess crystal structure, mineral composition, surface area, functional groups and the percentage of hematite in iron sand. Subsequently, the pH and contact time were optimized. The highest adsorption capacity is then determined using the Langmuir and Freundlich isotherms. The study found that hematite has a surface area before and after adsorption of 619.486 m²/g and 334.783 m²/g, with XRD peaks at 2θ = 33.037° and 35.357°, Fe-O bonds with a wavelength of 647.17 cm^-1 and hematite content of 63.335%. Optimal Cr(VI) adsorption occurs at pH 1, with a contact time of 120 minutes, Cr(VI) concentration of 50 mg/L, 5.0 g mass of hematite, with an adsorption capacity (Qe), and adsorption efficiency (%) of 3.83 mg/g and 75.95%. The Freundlich isotherm model accurately represents adsorption, revealing a heterogeneous surface. The linear equation of the Freundlich curve is Log Qe = 0.1152 Log Ce + 0.6376, R² = 0.9999, with the value of adsorption capacity (kf) = 4.3411 mg/g and adsorption intensity (n) = 8.681. The enthalpy of adsorption (ΔH_ads) at a concentration of 20 mg/L, 2.5 g, pH 3, and 30 minutes is -95.852 kJ/mol, indicating chemisorption.

Słowa kluczowe

EN

Cr(VI); hematite; adsorption; optimization; isotherm; enthalpy

• Wydawca: Polskie Towarzystwo Inżynierii Ekologicznej ; Lublin University of Technology
• Czasopismo: Journal of Ecological Engineering
• Rocznik: 2025
• Tom: Vol. 26, nr 1
• Strony: 223--233
• Opis fizyczny: Bibliogr. 28 poz., rys., tab.

Twórcy

autor

Susanti Evi

• Research Centre for Limnology and Water Resources, National Research and Innovation Agency, Republic of Indonesia, Jl. Raya Jakarta – Bogor KM. 46 Cibinong, Indonesia

• https://orcid.org/0000-0002-9558-9684

autor

Fathimah Assyadatina

• Student in the Department of Chemistry, Faculty of Mathematics and Sciences, Pakuan University, Bogor, Indonesia

autor

Zulti Fifia

• Research Centre for Limnology and Water Resources, National Research and Innovation Agency, Republic of Indonesia, Jl. Raya Jakarta – Bogor KM. 46 Cibinong, Indonesia

autor

Nafisyah Eva

• Research Centre for Limnology and Water Resources, National Research and Innovation Agency, Republic of Indonesia, Jl. Raya Jakarta – Bogor KM. 46 Cibinong, Indonesia

autor

Rosidah

• Research Centre for Limnology and Water Resources, National Research and Innovation Agency, Republic of Indonesia, Jl. Raya Jakarta – Bogor KM. 46 Cibinong, Indonesia

autor

Latief Sutanto

• Department of Chemistry, Faculty of Mathematics and Sciences, Pakuan University, Bogor, Indonesia

Bibliografia

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