Experimental investigations of arsenic adsorption from contaminated water using chemically activated hematite (Fe2O3) iron ore

Indigenous hematite iron ore was chemically activated as a function of various hydrogen peroxide concentrations (0.5, 1, 1.5, and 2.0 M), activation time, and iron ore size. Adsorption potential was evaluated at various initial arsenic concentrations, contact time, adsorbent dose, and particle size....

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Bibliographic Details
Published in:Environmental science and pollution research international 2021-03, Vol.28 (10), p.12898-12908
Main Authors: Memon, Abdul Qayoom, Ahmed, Shoaib, Bhatti, Zulfiqar Ali, Maitlo, Ghulamullah, Shah, Abdul Karim, Mazari, Shaukat Ali, Muhammad, Atta, Jatoi, Abdul Sattar, Kandhro, Ghulam Abbas
Format: Article
Language:English
Subjects:
Adsorption
Aquatic Pollution
Arsenic
Arsenic - analysis
Atmospheric Protection/Air Quality Control/Air Pollution
Diffusion models
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Ferric Compounds
Ferric oxide
Hematite
Hydrogen peroxide
Hydrogen-Ion Concentration
Iron
Iron compounds
Iron ores
Isotherms
Kinetics
Particle diffusion
Research Article
Waste Water Technology
Water
Water Management
Water Pollutants, Chemical - analysis
Water pollution
Water Pollution Control
Water Purification
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Summary:Indigenous hematite iron ore was chemically activated as a function of various hydrogen peroxide concentrations (0.5, 1, 1.5, and 2.0 M), activation time, and iron ore size. Adsorption potential was evaluated at various initial arsenic concentrations, contact time, adsorbent dose, and particle size. Maximum 95% removal efficiency was achieved at 600-μm size of iron ore, activated with 0.5 M concentration of hydrogen peroxide at 24 h of activation time. The experimental data were further evaluated through Langmuir and Freundlich isotherms. The maximum 14.46 mg/g of adsorption capacity was observed through Langmuir isotherm. Moreover, adsorption kinetics was evaluated using pseudo-first-order and pseudo-second-order kinetics, and the intra-particle diffusion model. The kinetics of arsenic adsorption was best described by using the pseudo-first-order kinetics with a kinetic rate of 0.621 min −1 . The hematite iron ore before and after arsenic adsorption was characterized by XRD, SEM, and EDX.
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-020-11208-x