Kim, Jae-Hyun Park, Jeong-Ann Kang, Jin-Kyu Kim, Song-Bae Lee, Chang-Gu Lee, Sang-Hyup Choi, Jae-Woo 2024-01-20T07:32:52Z 2024-01-20T07:32:52Z 2021-09-05 2015-03 1226-1025 https://pubs.kist.re.kr/handle/201004/125695 The aim of this study was to examine the phosphate (P) removal by quintinite from aqueous solutions. Batch experiments were performed to examine the effects of reaction time, temperature, initial phosphate concentration, initial solution pH and stream water on the phosphate adsorption to quintinite. Kinetic, thermodynamic and equilibrium isotherm models were used to analyze the experimental data. Results showed that the maximum P adsorption capacity was 4.77 mgP/g under given conditions (initial P concentration = 2-20 mgP/L; adsorbent dose = 1.2 g/L; reaction time = 4 hr). Kinetic model analysis showed that the pseudo second-order model was the most suitable for describing the kinetic data. Thermodynamic analysis indicated that phosphate sorption to quintinite increased with increasing temperature from 15 to 45 degrees C, indicating the spontaneous and endothermic nature of sorption process (Delta H-0=487.08 kJ/mol; Delta S-0=1,696.12 J/(K. mol); Delta G(0)=-1.67 to -52.56 kJ/mol). Equilibrium isotherm analysis demonstrated that both Freundlich and Redlich-Peterson models were suitable for describing the equilibrium data. In the pH experiments, the phosphate adsorption to quintinite was not varied at pH 3.0-7.1 (1.50-1.55 mgP/g) but decreased considerably at a highly alkaline solution (0.70 mgP/g at pH 11.0). Results also indicated that under given conditions (initial P concentration=2 mgP/L; adsorbent dose=0.8 g/L; reaction time=4 hr), phosphate removal in the stream water (1.88 mgP/g) was lower than that in the synthetic solution (2.07 mgP/g), possibly due to the presence of anions such as (bi) carbonate and sulfate in the stream water. English KOREAN SOC ENVIRONMENTAL ENGINEERS Phosphate sorption to quintinite in aqueous solutions: Kinetic, thermodynamic and equilibrium analyses Article 10.4491/eer.2014.053 1 ENVIRONMENTAL ENGINEERING RESEARCH, v.20, no.1, pp.73 - 78 ENVIRONMENTAL ENGINEERING RESEARCH 20 1 73 78 N scopus kci ART001976892 000422792900009 2-s2.0-84926303061 Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology Article Batch experiment Hydrotalcite-like particle Phosphate Quintinite Sorption