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Nitrate adsorption from aqueous solutions by calcined ternary Mg-Al-Fe hydrotalcite
- Source :
- Water Science and Technology. 75:2194-2203
- Publication Year :
- 2017
- Publisher :
- IWA Publishing, 2017.
-
Abstract
- Calcined ternary hydrotalcite like compounds had been synthesized by co-precipitation and calcined at 450 °C for 6 h. It had been applied into the nitrate removal from aqueous solutions. Various factors during adsorption process, such as chemical composition of adsorbents, adsorbent dosage, initial concentration of nitrate, initial pH and co-existing anions on nitrate adsorption had been investigated. It was found that 1.5 g/L CHTlcs (Mg/Al/Fe molar ratio = 3:0.1:0.9) could achieve ideal adsorption efficiency at an initial nitrate concentration of 100 mg/L. The value of pH had little effect on nitrate adsorption. The co-existing anions had the inhibitory effect on nitrate adsorption, which was in the order of PO43− > SO42− > Cl− > ClO4−. The batch adsorption studies showed that experimental data were well described by the pseudo-second-order kinetic model and Langmuir isotherm model, and the maximum isotherm adsorption capacity was 123.305 mg/g. The adsorption of nitrate was a spontaneous exothermic process with the reduction of entropy. The proposed adsorption mechanism obtained from characterization was that CHTlcs uptake nitrate through reconstruction effect and adsorption on external surface.
- Subjects :
- Anions
Magnesium Hydroxide
Environmental Engineering
Exothermic process
Inorganic chemistry
Magnesium Compounds
Aluminum Hydroxide
02 engineering and technology
010402 general chemistry
01 natural sciences
Water Purification
law.invention
chemistry.chemical_compound
symbols.namesake
Adsorption
Nitrate
law
Calcination
Aluminum Compounds
Water Science and Technology
Nitrates
Perchlorates
Aqueous solution
Hydrotalcite
Langmuir adsorption model
Hydrogen-Ion Concentration
021001 nanoscience & nanotechnology
0104 chemical sciences
Solutions
Kinetics
chemistry
symbols
0210 nano-technology
Ternary operation
Iron Compounds
Water Pollutants, Chemical
Subjects
Details
- ISSN :
- 19969732 and 02731223
- Volume :
- 75
- Database :
- OpenAIRE
- Journal :
- Water Science and Technology
- Accession number :
- edsair.doi.dedup.....934d467631dada4049b07589a6934903