Oxyhumolite influence on adsorption and desorption of phosphate on blast furnace slag in the process of two-stage selective adsorption of Cu(II) and phosphate
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Hana Kohutová
,
Bruno Kostura
Abstract
Two-stage adsorption was used for selective removal of Cu(II) and phosphate from aqueous solutions. In the first stage, adsorption of Cu(II) and phosphate on oxyhumolite (OX) was examined. The pseudo second-order equation was found to be the best fit for the kinetic adsorption data. The adsorption capacity of OX for Cu(II) and phosphate depends on the adsorption time, the equilibrium pH influences only the adsorption of Cu(II). The high adsorption efficiency (E = 95 %, pH 3.5, 0.5 g of the solid sorbent and 50 cm3 of the solution, c = 4 mmol dm−3) of OX for Cu(II) is caused by the presence of humic acids (HA). In the second stage, blast furnace slag (BFS) and activated blast furnace slag (BFS-A) were used to remove phosphates. The presence of OX in the first stage positively influences the adsorption efficiency of sorbents in the second stage due to the soluble humic compounds and residues of humic acids (HA) which support the precipitation of Ca-phosphates on BFS and the ions exchange reactions on BFS-A. Adsorption equilibrium of phosphate on both slags at 298 K can be well described by the Langmuir isotherm equation. Desorption of Cu(II) from OX was around 70 %. The presence of OX in the first stage also influences the desorption of phosphate bound in the second stage. Desorption efficiency of both slags for phosphate was about 60 %.
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© 2013 Institute of Chemistry, Slovak Academy of Sciences
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Articles in the same Issue
- Rapid determination of fosetyl-aluminium in commercial pesticide formulations by high-performance liquid chromatography
- Immobilisation of acid pectinase on graphene oxide nanosheets
- Bench-scale biosynthesis of isonicotinic acid from 4-cyanopyridine by Pseudomonas putida
- Enzymatic synthesis of a chiral chalcogran intermediate
- Separation of Cd(II) and Ni(II) ions by supported liquid membrane using D2EHPA/M2EHPA as mobile carrier
- Fouling of nanofiltration membranes used for separation of fermented glycerol solutions
- Oxyhumolite influence on adsorption and desorption of phosphate on blast furnace slag in the process of two-stage selective adsorption of Cu(II) and phosphate
- Cellulose-precipitated calcium carbonate composites and their effect on paper properties
- Landfill leachate treatment using the sequencing batch biofilm reactor method integrated with the electro-Fenton process
- Effect of sintering temperature on the magnetic properties and charge density distribution of nano-NiO
- Synthesis, optimization, characterization, and potential agricultural application of polymer hydrogel composites based on cotton microfiber
- Cu(II) removal enhancement from aqueous solutions using ion-imprinted membrane technique
- Synthesis of new eburnamine-type alkaloid via direct hydroalkoxylation
- Selection of surfactants as main components of ecological wetting agent for effective extinguishing of forest and peat-bog fires
- Ultrasonic and Lewis acid ionic liquid catalytic system for Kabachnik-Fields reaction
- A simple method for creating molecularly imprinted polymer-coated bacterial cellulose nanofibers
- Determination of pK a of N-alkyl-N,N-dimethylamine-N-oxides using 1H NMR and 13C NMR spectroscopy
