Sorption of phosphate onto calcite; results from batch experiments and surface complexation modeling

Sø, Helle Ugilt; Postma, Dieke; Jakobsen, Rasmus; Larsen, Flemming

doi:10.1016/j.gca.2011.02.031

Cited by 149 publications

(116 citation statements)

References 32 publications

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“…3b. It is well known that calcite (CaCO 3 ) can act as phosphate adsorbent, thereby influencing the phosphate sorption or desorption fluxes (Sø et al 2011;Suzuki et al 1986). With respect to pH condition, the phosphate adsorption efficiency could be increased with increasing pH condition due to inverse correlation between Ca 2?…”

Section: Adsorption Equilibrium Of Phosphate On Psbmentioning

confidence: 99%

Kinetic study on phosphate removal from aqueous solution by biochar derived from peanut shell as renewable adsorptive media

Jung

Hwang

Ahn

et al. 2015

Int. J. Environ. Sci. Technol.

155

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As an alternative strategy for phosphate removal, biochar (black carbon) has characteristics superior to those of widely used adsorptive media, from both economic and environmental points of view. In this study, various types of biochar derived from oak wood, bamboo wood, maize residue, soybean stover, and peanut shell were tested for evaluation of phosphate removal. After 24 h of reaction time, the phosphate removal was limited (2.0-9.4 %) in case of general adsorptive media. However, interestingly, among various biochars, peanut shell-derived biochar (PSB) exhibited the best performance, showing the highest phosphate removal rate, 61.3 % (3.8 mg PO 4-P g PSB -1 ). We attribute this high value to the proper structural properties of PSB, such as BET-specific surface area of 348.96 m 2 g -1 and mineral/phosphorus ratio (Mg/ P = 3.46 and Ca/P = 47.6). Adsorption equilibrium and kinetics of phosphate at different temperature (10, 20, and 30°C) were well explained in the whole experimental region by Langmuir isotherm and pseudo-second-order kinetic models, respectively. The maximum adsorption capacity of PSB was 6.79 mg g -1 for phosphate at 30°C. These findings suggest that PSB has great potential as an alternative and renewable adsorptive media for phosphate removal.

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Section: Adsorption Equilibrium Of Phosphate On Psbmentioning

confidence: 99%

Kinetic study on phosphate removal from aqueous solution by biochar derived from peanut shell as renewable adsorptive media

Jung

Hwang

Ahn

et al. 2015

Int. J. Environ. Sci. Technol.

155

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show abstract

“…To evaluate the model's efficiency in simulating the adsorption process, we calculated linear regressions for the Manning and Goldberg (1996); c Sø et al (2011); d Gustafsson (2001); e Goldberg (1999); f MINT-EQA2 v.4 database; g Reardon (1976) measured values (y) on the modeled ones (x) and the coefficients of determination (R 2 ). This statistical parameter indicates the ratio between the scatter of simulated values and the average values of measurements.…”

Section: Statistical Evaluationmentioning

confidence: 99%

Surface complexation model of boron adsorption by calcareous soils

Ranjbar

Jalali

2014

Int. J. Environ. Sci. Technol.

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This study aimed to evaluate boron (B) adsorption and the capacity of a surface complexation model for simulating this process in calcareous soils. Ten surface soils were collected from different land use areas in Hamedan, Western Iran, to characterize B sorption by soils. The mean B adsorbed by the sample soils varied from 8.9 to 32.8 %. Two empirical models including linear and Freundlich equations fitted well to the experimental data. The linear distribution (K d ) values varied from 1.32 to 6.86 L kg -1 , while the parameters of Freundlich equation including n and K Fr ranged from 1.16 to 1.33 and 3.31-16.81, respectively. The comparison of two empirical models indicated that B adsorption followed a nonlinear pattern. The soil organic matter had positive correlations with Freundlich and linear distribution coefficients. However, empirical models were not suitable for explaining the mechanism of B adsorption, so a surface complexation model was used to simulate and predict the B adsorption process. B adsorption modeling was conducted using Visual MINTEQ and PHREEQC, based on the assemblage of major surface components (hydrous ferric oxides, aluminum hydroxides, calcium carbonate, and humic acids). B adsorption was successfully modeled by surface complexation. The significant contribution of organic matter to B complexes was resulted from both experimental data and mechanistic modeling.

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“…Studies of temperate, boreal ecosystems indicate that the principal source of cave drip water P is leaching from plant residues during vegetation dieback, when this element is not taken up by plant roots and is retained in the soil zone (Filippelli, 2002;Sø et al, 2011;Fairchild and Baker, 2012). This process was assumed to be the source of P incorporated in stalagmites from southeastern Australia, where both temperature and rainfall show seasonal variations (Treble et al, 2003).…”

Section: P Incorporation In Speleothems and The Partition Coefficientmentioning

confidence: 99%

A re-evaluation of the palaeoclimatic significance of phosphorus variability in speleothems revealed by high-resolution synchrotron micro XRF mapping

et al. 2012

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Abstract. Phosphorus (P) is potentially a very important environmental proxy in speleothem palaeoclimate reconstructions. However, the transfer of P to a speleothem seems to vary between cave sites. Therefore, it is important to investigate the source of P and the way it is incorporated into a speleothem on a site-by-site basis before it can be used as a robust palaeoclimate proxy.In this paper, the distribution of P in one modern and two Early Pliocene speleothems formed in coastal caves on Christmas Island (Indian Ocean) and the Nullarbor Plain (southern Australia) is investigated using microscopy and ultra-high resolution chemical mapping.Phosphorus has been found to be both incorporated in the lattice and present as diverse P-rich phases. Monitoring data from Christmas Island suggest that co-precipitation of P-rich phases occurs when 'prior calcite precipitation' decreases following recharge, even if the drip rate decreases. Microbial mediation may also play a role, which complicates a direct climate relationship between P and hydrology. We find that some P-enriched layers contain dissolution features, with possible involvement of microbial mats which colonise pores during reduced drip rates associated with prolonged dry spells.In the two Early Pliocene speleothems the relationship between P and microbial laminae is clearer. Both petrographic and chemical data suggest that phosphorus-rich phases in the microbial laminae mark intervals of reduced drip rates, which may indicate dry intervals during the otherwise wet palaeoclimate of the Early Pliocene.We develop a speleothem distribution coefficient for phosphorus (SK P ) rather than the thermodynamic partition coefficient (K P ) to account for the presence of crystalline phosphate inclusions. SK P describes P enrichment in speleothems regardless of the process, as similar mechanisms of phosphate co-precipitation may be in operation in biotic and abiotic conditions.The most important implication of our study is that variability in P concentration may be related to diverse processes which can be recognized through petrographic observations and chemical mapping. In particular, there may not be a direct relation between an increase in P concentration and seasonal infiltration as has been found in some previous studies, especially if the source of this element is not the labile phosphate released through leaching during seasonal vegetation dieback in temperate climates.

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Sorption of phosphate onto calcite; results from batch experiments and surface complexation modeling

Cited by 149 publications

References 32 publications

Kinetic study on phosphate removal from aqueous solution by biochar derived from peanut shell as renewable adsorptive media

Kinetic study on phosphate removal from aqueous solution by biochar derived from peanut shell as renewable adsorptive media

Surface complexation model of boron adsorption by calcareous soils

A re-evaluation of the palaeoclimatic significance of phosphorus variability in speleothems revealed by high-resolution synchrotron micro XRF mapping

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