Equilibrium and kinetic studies of phosphate removal from solution onto a hydrothermally modified oyster shell material

Phosphate removal to a hydrothermally modified fumed silica and pulverized oyster shell material for use in wastewater treatments were made. Sorption data modeling (pH's 3-11, P concentrations of 3, 5, 10, 15, 20, & 25 mg/L, and at an ambient temperature of 23°C) indicate that an optimal re...

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Bibliographic Details
Published in:PloS one 2013-04, Vol.8 (4), p.e60243
Main Authors: Chen, Jie, Cai, Yun, Clark, Malcolm, Yu, Yan
Format: Article
Language:English
Subjects:
Acids
Adsorbents
Adsorption
Ambient temperature
Animal Shells - chemistry
Animals
Annealing
Aqueous solutions
Chemical engineering
Chemical kinetics
Data processing
Diffusion
Diffusion rate
Earth Sciences
Engineering
Equilibrium
Experiments
Fumed silica
Hazardous materials
Hazardous substances
Hydrogen-Ion Concentration
Iron alloys
Kinetics
Mass transfer
Materials Science
Modelling
Organophosphates - chemistry
Ostreidae - chemistry
Particle diffusion
pH effects
Phosphates
Phosphorus removal
Physiological aspects
Pulverized
Sewage treatment
Silica
Silica fume
Silicon dioxide
Solutions
Sorption
Studies
Temperature
Wastewater treatment
Water Pollutants, Chemical - chemistry
Water Purification
Zeolites
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Summary:Phosphate removal to a hydrothermally modified fumed silica and pulverized oyster shell material for use in wastewater treatments were made. Sorption data modeling (pH's 3-11, P concentrations of 3, 5, 10, 15, 20, & 25 mg/L, and at an ambient temperature of 23°C) indicate that an optimal removal of P occurs at pH 11. Three kinetic models were also applied (a pseudo-first-order Lagergren kinetic model, a pseudo-second-order (PSO) kinetic and Elovich) and indicate that a PSO model best describes P-removal. In addition, an application of the Weber and Morris intra-particle diffusion model indicates that external mass transfer and intra-particle diffusion were both involved in the rate-determining step. Langmuir, Freundlich modeling of the sorption data also indicate that the heterogeneous Freundlich sorption site model best describes the data although Langmuir data also fit with data tailing suggesting data are not linear. The data collected indicates that the hydrothermally modified fumed silica and pulverized oyster shell material is suitable for use in wastewater treatment, with P-removal to the solids being preferential and spontaneous.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0060243