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Trends of Natural and Acid-Engineered Pumice Onto Phosphorus Ions in Aquatic Environment: Adsorbent Preparation, Characterization, and Kinetic and Equilibrium Modeling Publisher



Safari GH1 ; Zarrabi M2 ; Hoseini M1 ; Kamani H3 ; Jaafari J1 ; Mahvi AH1, 4, 5
Authors
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Authors Affiliations
  1. 1. School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Faculty of Health, Department of Environmental Health Engineering, Alborz University of Medical Sciences, Karaj, Iran
  3. 3. Health Promotion Research Center and School of Public Health, Zahedan University of Medical Sciences, Zahedan, Iran
  4. 4. Centers for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
  5. 5. National Institute of Health Research, Tehran University of Medical Sciences, Tehran, Iran

Source: Desalination and Water Treatment Published:2015


Abstract

Abstract: The objective of this study was to investigate the potential of natural and acid-modified pumice as an adsorbent in phosphorous removal from aqueous solution. Various experimental parameters such as initial phosphorous concentration, adsorbent dosage, contact time, and pH were investigated. The most common isotherms and the kinetic adsorption models were used for survey of phosphorous adsorption mechanism. Results indicated that pH plays a significant role in the adsorption of phosphorous. The adsorption capacity increased with increase in contact time and initial phosphorous concentration and after 30 and 45 min, reached equilibrium for modified and natural pumice, respectively. Maximum adsorption of phosphorous (9.74 mg/g) was obtained in the pH ranging from 5 to 7, pumice dosage of 2 g/L, and contact time of 30 min using the modified pumice. Further increase of adsorbent dosage over 2 g/L didn’t have significant effect on the phosphorous adsorption. The experimental results showed that absorption process and equilibrium data were well fitted using the pseudo-second-order kinetic model (R2 > 0.99) and Langmuir No 2 isotherm (R2 > 0.99). The foreign anions such as Cl−, NO3 −, SO4 2−, and HCO3 − didn’t have noticeable effects on the phosphorous adsorption. In general, the adsorption capacity of acid-modified pumice in the same conditions is more than natural pumice (55–60%). As general conclusion; modified pumice can be used successfully as low-cost and effective absorbent for phosphorous removal from aqueous solution. © 2014 Balaban Desalination Publications. All rights reserved.
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