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Publication Metadata only Reduction of DBP precursors and their THMFPs in leachate contaminated groundwater by PAC adsorption(2017-07-31) Kanlayanee Yimyam; Aunnop Wongrueng; Pharkphum Rakruam; Saoharit Nitayavardhana; Athit Phetrak; Suthida Theepharaksapan; Suraphong Wattanachira; Chiang Mai University; Mahidol University; Srinakharinwirot Universitycontaminated groundwater around an inactive open-dumping landfill was selected as the raw water. The PAC adsorption reaction was proven to be the pseudo second order kinetic reaction and the Freundlich isotherm. The dissolved organic carbon (DOC), dissolvedPublication 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.