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Publication Open Access Use of Agricultural Residues to Remove Iron from Groundwater in Modified Airlift Aerator(2019) Thanakrit Neamhom; Mahidol University. Faculty of Public Health. Department of Environmental Health ScienceThis work investigated groundwater iron adsorption capacity from rice husk, rice straw, water hyacinth and coconut shell, agricultural residues commonly found in Thailand. This study also investigated the adsorption behaviorPublication Open Access Fast and Efficient Removal of Hexavalent Chromium from Water by Iron Oxide Particles(2018) Duangta Kitkaew; Athit Phetrak; Sumate Ampawong; Rachaneekorn Mingkhwan; Doungkamon Phihusut; Kamolnetr Okanurak; Chongrak Polprasert; Mahidol University. Faculty of Public Health. Department of Sanitary Engineering; Mahidol University. Center of Excellence on Environmental Health and Toxicology (EHT); Mahidol University. Faculty of Tropical Medicine. Department of Social and Environmental Medicine; Mahidol University. Faculty of Tropical Medicine. Department of Tropical Pathology; Chulalongkorn University. Environmental Research Institute; Thammasat University. Faculty of Engineering. Department of Civil EngineeringIron oxide particles (IOPs) were synthesized by chemical co-precipitation technique and further used as an adsorbent in removing hexavalent chromium (Cr(VI)) from aqueous solutions during batch adsorption. The IOP adsorbent had specific surface area of 65 m2/g, total pore volume of 0.25 cm3/g and mostly contained a mesoporous structure. The analysis of scanning and transmission electron microscopy indicated that the adsorbent contained a substantial amount of iron oxide of about 66%, which was well distributed throughout the adsorbent. The IOP adsorbent showed a rapid and efficient Cr(VI) removal that followed Langmuir adsorption isotherm model with maximum adsorption capacity of 2.39 mg-Cr(VI)/g-IOP, demonstrating a monolayer formation on the adsorptive sites of IOP. The kinetic adsorption of Cr(VI) on the IOP followed the pseudo-second-order model, suggesting chemisorption. Thus, the IOP adsorbent provides a potentially effective technology in eliminating of Cr(VI) from water since it can remove appreciable amounts of Cr(VI) with a relatively short contact time of 30 min.