Phosphate sorption capacity of European volcanic soils

2010 ◽  
Vol 59 (1) ◽  
pp. 77-84
Author(s):  
Gy. Füleky
Keyword(s):  
Sorption Capacity ◽  
Soil Property ◽  
High Ratio ◽  
Surface Reactivity ◽  
Soil Horizon ◽  
Phosphate Adsorption ◽  
Volcanic Soils ◽  
Phosphate Binding ◽  
Phosphate Sorption ◽  
Sorption Ability

The aim of the presented study was to prepare the phosphate sorption isotherms of 20 European volcanic soil profiles and some other Hungarian and German volcanic soils (n = 114) used in the experiment and to establish the soil characteristics determining the phosphate sorption capacity of these soils. The Langmuir isotherm well describes the phosphate sorption of European volcanic soils at bright concentration interval 0–600 mg·dm -3 P. The calculated phosphate adsorption maximum (P max ) is an excellent soil property for characterizing the surface activity of soils developed on volcanic parent material. The calculated phosphate sorption maxima of soils included in the experiment ranged from 0 to 10.000 mg P·kg -1 . Some of the volcanic soils sorbed a high ratio of the added phosphate at low concentrations, while others sorbed somewhat less. The difference in the phosphate binding affinity of soils caused the differences in the shape of the Langmuir adsorption isotherms. P retention % is a WRB diagnostic requirement of andic soil horizon. It was supposed that the phosphate sorption maximum (P max ) gives a better characterization of the surface reactivity of volcanic soils. As it was predicted, oxalate soluble Al is the most important soil property, which dominantly (in 73%) explained the phosphate sorption ability of European volcanic soils.

scholarly journals Phosphate sorption and desorption by two contrasting volcanic soils of equatorial Africa

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5820 ◽  
Author(s):  
Sara Gonzalez-Rodriguez ◽  
Maria Luisa Fernandez-Marcos
Keyword(s):  
Plant Growth ◽  
Sorption Isotherms ◽  
Active Species ◽  
Soil Samples ◽  
Phosphate Adsorption ◽  
Phosphorus Fertilization ◽  
Phosphorus Concentration ◽  
Limiting Factor ◽  
Volcanic Soils ◽  
Phosphate Sorption

Volcanic soils cover 1% of the Earth’s surface but support 10% of the world’s population. They are among the most fertile soils in the world, due to their excellent physical properties and richness in available nutrients. The major limiting factor for plant growth in volcanic soils is phosphate fixation, which is mainly attributable to active species of aluminium and iron. The sorption and desorption of phosphate is studied on the surface horizons of two African agricultural soils, a silandic Andosol (Rwanda) and a vitric Andosol (São Tomé and Principe). Both soils are slightly acid. The silandic Andosol is rich in active aluminium forms, while the vitric Andosol has high amounts of crystalline iron and aluminium oxides. Sorption isotherms were determined by equilibrating at 293K soil samples with phosphate solutions of concentrations between 0 and 100 mg P L−1 in NaNO3; phosphate was determined by visible spectrophotometry in the equilibrium solution. To study desorption, the soil samples from the sorption experiment were equilibrated with 0.02 M NaNO3. The isotherms were adjusted to mathematical models. In almost all the concentration range, the adsorption of phosphate by the silandic Andosol was greater than 90% of the amount added, being lower in the vitric Andosol but always higher than 65%. The high sorption by the silandic Andosol is attributed to its richness in non-crystalline Fe and Al, while in the vitric Andosol crystalline iron species seem to play a relevant role in the adsorption. The sorption isotherms of both soils fitted to the Temkin model, the adjustment to the Langmuir or Freundlich models being unsatisfactory; throughout the range studied, the sorption increases with increasing phosphorus concentration, a maximum sorption is not predictable (as occurs when the sorption is adjusted to the Langmuir model). For an added P concentration of 100 mg L−1 (3.2 mmol L−1), the sorption is 47.7 µmol P g−1 in the silandic Andosol and 41.6 µmol P g−1 in the vitric Andosol. The desorption is low and the comparison of the sorption and desorption isotherms reveals a pronounced hysteresis, that is, the irreversibility of the sorption. The high phosphate sorption and its irreversibility are comparable to those published for other volcanic soils with high contents of allophane, active aluminium and free iron. The strong phosphate adsorption is a serious limiting factor for plant growth, which requires a careful management of phosphorus fertilization.

scholarly journals Simultaneous removal of nitrogen and phosphorus by cetylpyridinium bromide modified zeolite

2017 ◽  
Vol 76 (11) ◽  
pp. 2895-2906 ◽  
Author(s):  
Chengle Li ◽  
Jing Yao ◽  
Tian C. Zhang ◽  
Wenya Xing ◽  
Ying Liang ◽  
...  
Keyword(s):  
Ammonium Nitrate ◽  
Adsorption Capacity ◽  
Sorption Capacity ◽  
Synthetic Wastewater ◽  
Phosphate Adsorption ◽  
Ammonium Concentration ◽  
Simultaneous Removal ◽  
Cetylpyridinium Bromide ◽  
Modified Zeolite ◽  
Phosphate Sorption

Abstract In this study, surfactant modified zeolite-clinoptilolite (SMZ) by CPB (cetylpyridinium bromide) was used for simultaneous removal of ammonium, nitrate and phosphate in synthetic wastewater, and the sorption properties of SMZ were determined and compared with natural zeolite. Results showed that natural clinoptilolite had good affinity for ammonium (8.940 mg/g), but not for nitrate (0.427 mg/g) and phosphate (0.801 mg/g). With the increase of surfactant loading from 5 g/L to 40 g/L, the sorption capacity for nitrate increased from 0.462 mg/g to 4.661 mg/g. when the surfactant loading is 40 g/L, the SMZ has a phosphate adsorption capacity of 2.119 mg/g. The SMZ had a significant enhancement on nitrate and phosphate sorption, could simultaneously remove ammonium, nitrate and phosphate at specific conditions, with removal efficiency up to 85.2%, 83.1% and 56.7%, respectively. Orthogonal experiments showed that ammonium concentration was the most important factor for ammonium sorption on SMZ. Surfactant loading was the major factor for nitrate and phosphate sorption. With the increase of surfactant loading from 5 g/L to 40 g/L, the sorption capacity for nitrate increased from 0.462 mg/g to 4.661 mg/g. When the surfactant loading is 40 g/L, the SMZ has the best phosphate adsorption capacity 2.119 mg/g. Samples were characterized by X-ray diffraction (XRD) and Brunauer–Emmett–Teller (BET). Semi-empirical quantum mechanics molecular simulation indicated that electrostatic attraction existed between CPB and dihydrogen phosphate ion. Results indicate that SMZs might have great potential of removing cations and anions simultaneously in the aquatic environment, which is good for eutrophication control and nutrients removal.

Removal of Anions from Solution by Calcined Hydrotalcite and Regeneration of Used Sorbent in Repeated Calcination-Rehydration-Anion Exchange Processes

1999 ◽  
Vol 64 (9) ◽  
pp. 1517-1528 ◽  
Author(s):  
František Kovanda ◽  
Eva Kovácsová ◽  
David Koloušek
Keyword(s):  
Anion Exchange ◽  
Sorption Capacity ◽  
Sorption Isotherms ◽  
Layered Crystal ◽  
Calcined Hydrotalcite ◽  
Capacity Evaluation ◽  
Exchange Processes ◽  
Sorption Ability ◽  
Subsequent Calcination ◽  
Rehydration Process

Synthetic hydrotalcite calcined at 350-550 °C was used for the removal of arsenate, chromate, and vanadate ions from water solutions. The initial anion concentrations were 0.002 mol l-1. The sorption isotherms were measured at 20 °C and at neutral pH. The Langmuir adsorption isotherm was used for the sorption capacity evaluation. The ability of the calcined hydrotalcite to remove the anions from solution decreased in the order of vanadate - arsenate - chromate. The hydrotalcite calcined at 450 °C exhibited the best sorption ability for all the anions. The sorbed anions were released by anion exchange in a carbonate-containing solution and the hydrotalcite after subsequent calcination was used again for the removal of anions. The repeating cycles calcination-rehydration-anion exchange gradually reduced the adsorption capacity of the hydrotalcite. The sorption capacity decreased by 50% after the first two cycles but it did not change significantly in the subsequent cycles. When chromate anions were adsorbed, the decrease in sorption capacity was not observed during repeated calcination-rehydration-anion exchange cycles. The change in the sorption capacity was influenced by the ability of calcined hydrotalcite to regenerate the layered crystal structure during the rehydration process.

scholarly journals Sorption of V and VI group metalloids (As, Sb, Te) on modified peat sorbents

2016 ◽  
Vol 14 (1) ◽  
pp. 46-59 ◽  
Author(s):  
Linda Ansone-Bertina ◽  
Maris Klavins
Keyword(s):  
Sorption Capacity ◽  
Batch Tests ◽  
Physical Sorption ◽  
Sorption Ability ◽  
A Minor ◽  
Competing Ions ◽  
Optimal Ph ◽  
Sorption Time

AbstractThe present work investigates arsenic, antimony and tellurium sorption using iron modified peat. The results were obtained using batch tests and the sorption was studied as a function of initial metalloid concentration, pH and sorption time, as well as the presence of competing substances. The obtained results indicate that modification of peat with Fe compounds significantly enhances the sorption capacity of the sorbents used for sorption of arsenic, antimony and tellurium. The optimal pH interval for the sorption of Sb(III) is 6.5–9 and for As(V) and Sb(V) – 3–6, while As(III) and tellurium sorption using Fe-modified peat is favourable in a wider interval of 3–9. The presence of competing ions as well as HA affect sorption of metalloids on Fe-modified peat. A minor impact on the reduction of metalloid sorption was detected in the presence of nitrate, sulphate, carbonate and tartrate ions, while in the presence of phosphate and HA the sorption ability of metalloids can be considerably reduced. The obtained results of kinetic experiments indicate that sorption of metalloids on Fe-modified peat mainly occurs relying on mechanisms of physical sorption processes.

scholarly journals Fe3O4nanoparticles coated with a guanidinium-functionalized polyelectrolyte extend the pH range for phosphate binding

2017 ◽  
Vol 5 (35) ◽  
pp. 18476-18485 ◽  
Author(s):  
Laura Paltrinieri ◽  
Min Wang ◽  
Sumit Sachdeva ◽  
Nicolaas A. M. Besseling ◽  
Ernst J. R. Sudhölter ◽  
...  
Keyword(s):  
Phosphate Adsorption ◽  
Functional Coatings ◽  
Phosphate Binding ◽  
Alkaline Conditions ◽  
Ph Range

This work shows the enhanced effect of functional coatings on phosphate adsorption at alkaline conditions using Fe3O4NPs.

Geostatistical assessment of the regional distribution of phosphate sorption capacity parameters (FeOX and AlOX) in northern Belgium

Geoderma ◽  
1995 ◽  
Vol 66 (3-4) ◽  
pp. 285-296 ◽  
Author(s):  
Richard Lookman ◽  
Nadia Vandeweert ◽  
Roel Merckx ◽  
Karel Vlassak
Keyword(s):  
Sorption Capacity ◽  
Regional Distribution ◽  
Phosphate Sorption

scholarly journals Time changeability model of the bog ore sorption ability

2014 ◽  
Vol 21 (1) ◽  
pp. 113-123
Author(s):  
Kazimierz Gaj ◽  
Hanna Cybulska-Szulc
Keyword(s):  
Statistical Analysis ◽  
Regression Model ◽  
Sorption Capacity ◽  
Time Variation ◽  
Iron Ore ◽  
Theoretical Calculations ◽  
Sorption Ability ◽  
Laboratory Examinations

Abstract Basing on long-standing cyclic measurements of sludge-originated biogas composition and considering statistical analysis of their results, a regression model describing time variation of biogas desulfurization using bog iron ore has been developed. The model was verified by theoretical calculations and results from laboratory examinations of the sorbent. It was also used to estimate the depletion time and sorption capacity of the bed and to determine the demand index for bog ore.

Surface-modified apricot pits as biochar feedstock and phosphate sorbent

2020 ◽  
Author(s):  
Gerhard Soja ◽  
Stefan Wyhlidal ◽  
Wolfgang Friesl-Hanl ◽  
Kathrin Zwölfer ◽  
Julia Edlinger ◽  
...  
Keyword(s):  
Surface Modification ◽  
Sorption Capacity ◽  
Vegetable Oils ◽  
Liquid Media ◽  
Phosphate Sorption ◽  
Sorption Dynamics ◽  
Negative Effect ◽  
Screw Reactor ◽  
Surface Modified

<p>Pits from fruit like apricots, peaches and cherries are an under-utilized resource. If there is any use at all, they may be extracted for special vegetable oils. Mostly the pits are combusted or left to rot. However, they are also an appropriate feedstock for pyrolytic carbonization. This study investigated the biochar produced from apricot pits for its potential to sorb phosphate from liquid media and from artificial wastewater.</p><p>Shredded apricot pits were pyrolyzed at 450 °C in a lab-scale screw reactor (Pyreka 3.0). Additionally, the impregnation of the feedstock with Mg(OH)<sub>2</sub> before pyrolysis was studied to test the hypothesis that phosphate sorption to biochar takes advantage of metal bridges on the biochar surface.</p><p>The results of isotherm sorption experiments showed that the pre-pyrolysis Mg-surface modification of the pits improved the sorption capacity of the biochar up to 42 mg PO<sub>4</sub>-P/g whereas the unmodified biochar adsorbed only about one tenth. When KH<sub>2</sub>PO<sub>4</sub> was used as the only sorbate, EDX-mapping showed the formation of K-struvite-crystals in the pores of the biochar. Desorption experiments showed a major release of the adsorbed phosphate within a few hours. Sorption competition experiments with phosphate and nitrate showed no negative effect of nitrate on phosphate sorption. Feedstock impregnation with Ca(OH)<sub>2</sub> resulted in more variable sorption dynamics.</p><p>The results could be confirmed by deploying the surface-modified apricot pit biochar for the reduction of the phosphate load in artificial wastewater.</p>

The comparative significance and utility of the Freundlich and Langmuir parameters for characterizing sorption and plant availability of phosphate in soils

Soil Research ◽  
1982 ◽  
Vol 20 (3) ◽  
pp. 233 ◽  
Author(s):  
ICR Holford
Keyword(s):  
Sorption Capacity ◽  
Plant Uptake ◽  
Langmuir Equation ◽  
Plant Availability ◽  
Phosphate Sorption ◽  
Surface Equation ◽  
Highly Correlated ◽  
Two Parameters

In studies using 62 Australian and English soils, the two parameters of the Freundlich sorption equation were compared with phosphate sorption capacity, calculated from the Langmuir 'two-surface' equation, and sorptivity and affinity indices calculated from the simple Langmuir equation applied to an isotherm concentration range of 0-5�g phosphorus/ml. The Freundlich extensive parameter was most highly correlated with sorptivity, and to a decreasing extent with sorption capacity and affinity. It appears to be fundamentally a sorptivity index which reflects the sorption capacity more than the affinity component of sorption, although greatly underestimating sorption capacity. The reciprocal of the Freundlich exponent proved to be an affinity parameter and was most useful in this role on soils of similar sorption capacity. However, conflicting results on different groups of soils showed that this parameter was less distinctive in its role than the others. Studies on two different groups of soils showed that the sorptivity and affinity parameters from the Langmuir equation accounted for more of the variance in plant uptake of labile phosphate than the Freundlich parameters.

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