Phosphate removal from wastewaters by a naturally occurring, calcium-rich sepiolite

Yin, Hongbin; Ye, Yun; Zhang, Yinlong; Fan, Chengxin

doi:10.1016/j.jhazmat.2011.10.072

Cited by 127 publications

(43 citation statements)

References 33 publications

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“…The r 2 values obtained for this model were above 0.97, indicating a very good mathematical fit by the model. Similar results have been reported for the adsorption of P by modified bentonites (Zamparas et al 2012), calcium-rich sepiolite (Yin et al 2011), and pillared bentonites (Yan and Xu 2010). Values of K f for Feadsorbents were higher than those for other modified adsorbents.…”

Section: Sorption and Desorption Isothermssupporting

confidence: 86%

Use of modified clays for removal of phosphorus from aqueous solutions

Moharami

Jalali

2015

Environ Monit Assess

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Phosphorus (P) removal from aqueous solutions was investigated using modified bentonite, calcite, kaolinite, and zeolite with FeCl3, CaCl2, and NaCl. The maximum sorption capacity of P was obtained by modified adsorbents with Fe(3+) ions (Fe-adsorbents). The results showed that P sorption capacity by Fe-adsorbents (bentonite (1.31 mg g(-1)), calcite (1.97 mg g(-1)), kaolinite (1.31 mg g(-1)), and zeolite (1.58 mg g(-1))) was improved by ∼467, 107, 409, and 427 %, respectively, compared to unmodified adsorbents (bentonite (0.28 mg g(-1)), calcite (1.82 mg g(-1)), kaolinite (0.32 mg g(-1)), and zeolite (0.37 mg g(-1))). Sorption isotherms were well described by the Freundlich model. Desorption experiments showed that the desorption capacity was in order of unmodified adsorbents > modified adsorbents with Na(+) ions (Na-adsorbents) > modified adsorbents with Ca(2+) ions (Ca adsorbents) > Fe-adsorbents. Effect of pH and ion strength was also investigated. At different pH, changes in the ionic strength had little effect on the adsorption. Results showed that double-layer model (DLM) could model P adsorption onto modified adsorbents over a wide range of pH and varying ionic strength. According to the scanning electron microscopy (SEM) images and saturation indices (SIs), high P removal by adsorbents was partly due to the P precipitation.

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Section: Sorption and Desorption Isothermssupporting

confidence: 86%

Use of modified clays for removal of phosphorus from aqueous solutions

Moharami

Jalali

2015

Environ Monit Assess

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“…Increases of 37 and 38% were shown by the former and of 95 and 111% by the latter at sepiolite application rates of 2 and 5%, respectively. On one hand, sepiolite has been found to sorb phosphate (Uǧurlu, 2008;Yin et al, 2011), and on the other, it is known that phosphate inhibits the acid and alkaline phosphatase activity in soils (Juma and Tabatabai, 1978;Kunito et al, 2012). The increase of the phosphomonoesterase activity in control soil after the application of sepiolite as amendment may be explained by the occurrence of these two concomitant processes.…”

Section: Soil Microbiological Parametersmentioning

confidence: 99%

Assessment of the use of sepiolite amendment to restore heavy metal polluted mine soil

et al. 2016

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“…An aliquot was sampled at the end of 24 h followed by centrifugation and filtration and P in the solution was analyzed colorimetrically. The P desorption rate was calculated with the following Equation (Yin et al 2011):…”

Section: Stability Of P-saturated Water Treatment Residual Nanoparticlesmentioning

confidence: 99%

Green synthesis of nanoparticles by milling residues of water treatment

2015

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Producing clean water from wastewater is a major issue due to environmental pollution. There is in particular a need for cheap sorbents to filter water. Here we developed a method to produce sorbing nanoparticles from water treatment residues using high-energy ball milling. Results show that 75 min of milling of residues yields particles sized lower than 100 nm, according to scanning and transmission electron microscopy. The sorption capacity of nanoparticles, of 50.0 mg Pg -1 , is 30 times higher than the sorption maxima of unmilled residues, of 1.7 mg Pg -1 . Our method is therefore simple, efficient, and cheap, and enhances highly the adsorption capacity of treatment residues.

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Phosphate removal from wastewaters by a naturally occurring, calcium-rich sepiolite

Cited by 127 publications

References 33 publications

Use of modified clays for removal of phosphorus from aqueous solutions

Use of modified clays for removal of phosphorus from aqueous solutions

Assessment of the use of sepiolite amendment to restore heavy metal polluted mine soil

Green synthesis of nanoparticles by milling residues of water treatment

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