Removal of boron from wastewater by the hydroxyapatite formation reaction using acceleration effect of ammonia

Yoshikawa, Eishi; Sasaki, Akira; Endo, Masatoshi

doi:10.1016/j.jhazmat.2012.08.045

Cited by 44 publications

(10 citation statements)

References 23 publications

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“…To investigate the specific mechanism of B removal, NH 4 H 2 PO 4 , which showed the best kinetic performance in P species for B removal, was selected as a co-precipitation reagent [ 3 ]. In general, 0.3434 g COS as a Ca source and an alkaline reagent were added to 100 mL of solution containing 142.76 mg/L H 3 BO 3 (25 mg/L B) and 2.12 g/L NH 4 H 2 PO 4 (570 mg/L P).…”

Section: Methodsmentioning

confidence: 99%

“…The 11 B-NMR spectra for the solid residues after the equilibrium of co-precipitation were shown with the coordination of B in Figure 7d, which means that B was not simply fixed in the form of [B(OH) 4 − ]; rather, the structural change occurred after fixation. With an initial B concentration of 2.31 mmol, the peak area ratio of 3 [B]/ 4 [B] is estimated to be 0.74, so borate is mainly fixed in the form of tetragonal borate. The results of solid NMR of the precipitated material were completely different from those of a pure boric acid solid.…”

Section: Characterization Analysismentioning

confidence: 99%

“…Therefore, the World Health Organization has formulated a guideline value of 2.4 mg/L B for drinking water, while individual countries have implemented stricter standards [ 2 ]. In fact, soluble B can more often be detected at low to medium concentrations due to the industrial release of B-containing pollutants and wastewater from borosilicate glass, cosmetics, textiles, paints, wood processing, detergents, insecticides, drugs, and moderators in nuclear reactors [ 3 ]. The interval where B is converted from a nutrient to a contaminant is fairly narrow.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phosphorus Co-Existing in Water: A New Mechanism to Boost Boron Removal by Calcined Oyster Shell Powder

et al. 2021

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The removal of boron (B) from water by co-precipitation with hydroxyapatite (HAP) has been extensively studied due to its low cost, ease of use and high efficiency. However, there is no explicit mechanism to express how resolved B was trapped by HAP. Thus, in this work, the process of removing B from water was studied using a low-cost calcium (Ca) precipitation agent derived from used waste oyster shells. The results showed that the removal rate of B in the simulated wastewater by calcined oyster shell (COS) in the presence of phosphorus (P) is up to more than 90%, as opposed to virtually no removal without phosphate. For B removal, the treated water needs to be an alkaline solution with a high pH above 12, where B is removed as [CaB(OH)4]+ but is not molecular. Finally, the synergistic mechanism of co-precipitation between HAP and dissolved B, occlusion co-precipitation, was explained in detail. The proposed method discovered the relationship between Ca, P and B, and was aimed at removing B without secondary pollution through co-precipitation.

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Section: Methodsmentioning

confidence: 99%

Section: Characterization Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phosphorus Co-Existing in Water: A New Mechanism to Boost Boron Removal by Calcined Oyster Shell Powder

et al. 2021

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“…The applications of boron-doped HA in literature are mostly limited to being a component of bone tissue engineering scaffolds and having a supportive function in phosphors for fluorescent lamps. Boron is normally present as boric acid and borate ions [13] in geothermal water and there are many studies that utilize HA for the removal of boron from geothermal and wastewater [11,14]. Moreover, boric acid is used as a neutron absorbent in nuclear reactors.…”

Section: Introductionmentioning

confidence: 99%

Boron doped Hydroxapatites in Biomedical Applications

Uysal¹,

Yılmaz²,

Evis³

2020

Journal of Boron

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Hydroxyapatite has been widely used in biomedical applications as a coating material for implant surfaces, a drug carrier, a scaffold or composite for bone tissue engineering applications. The highly ionic structure of hydroxyapatite allows doping of various ions, resulting in an improvement in its properties. Boron is one of the elements which can be doped into hydroxyapatite structure by replacing phosphate (PO 4 3-) or hydroxyl (OH-) sites to obtain scaffolds for bone tissue engineering applications or a coating material for metal substrates. Although the effects of supplemental boron on bone, liver, and brain metabolism have been shown to have important results as a nutrient, there are very few studies in the literature on the use of boron-doped hydroxyapatite in the biomedical field. In this review, the details of synthesis methods and functional groups of boron-doped hydroxyapatite were tabulated. Generally, the addition of boron leads to the formation of rod-like morphology, while the density and Vicker's microhardness of hydroxyapatite decrease. Thermal stability and electrical insulation properties were observed to improve with boron doping. Boron was also shown to increase biodegradability, bioactivity as well as cell proliferation and differentiation of different cell types on the surface of hydroxyapatite.

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“…Even though microwave technologies have a high performance level in heating efficiency, their full-scale development for wastewater treatment is still a longterm goal. In 2012, an acceleration method with low initial boron concentration by using ammonia was reported (Yoshikawa et al 2012); nevertheless, that was difficult to use in the wastewater containing high-level boron. Consequently, in this study, conventional heating method with shorter reaction time at lower temperature and modified Ca(OH) 2 particle were considered in order to improve boron recovery efficiency on account of less energy input.…”

Section: Introductionmentioning

confidence: 99%

Boron recovery from high boron containing wastewater using modified sub-micron Ca(OH)2 particle

Tsai

2013

Int. J. Environ. Sci. Technol.

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In the present study, two modified calcium hydroxide (Ca(OH) 2 ) particles, sub-micron Ca(OH) 2 made by CaCl 2 and Ca(NO 3 ) 2 , were applied to improve efficiency of boron recovery from concentrated wastewater under mild temperature conditions. The two modified calcium hydroxide particles led to higher recovery efficiencies at 95°C for 1 h (77.2 and 76.3 %) as compared to the efficiency by using un-modified Ca(OH) 2 (67.2 %). The difference was due to their different particle size constitutions. For the reaction kinetic of boron removal, it was found that the pseudo-first-order model fitted well in the experimental data. The sub-micron Ca(OH) 2 were used to remove and recover boron from a polarizer manufacturing wastewater. The findings revealed that it is worth recovering the boron containing precipitates because of the close boron content in the precipitates (sub-micron Ca(OH) 2 made by CaCl 2 : 7.0 %, sub-micron Ca(OH) 2 made by Ca(NO 3 ) 2 : 7.1 %) as compared to natural boron minerals (borax: 11.3 %). In addition, in order to estimate energy efficiency of boron recovery by chemical precipitation method, an evaluating formula, energy consumption of boron uptake, was developed. The value of energy consumption of boron uptake by using sub-micron Ca(OH) 2 made by CaCl 2 with the optimum condition was comparatively high (35.4 lg-B/g-Ca(OH) 2 /kJ). Therefore, the sub-micron Ca(OH) 2 particles were observed more effective for boron recovery from concentrated wastewater under moderate temperatures.

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Removal of boron from wastewater by the hydroxyapatite formation reaction using acceleration effect of ammonia

Cited by 44 publications

References 23 publications

Phosphorus Co-Existing in Water: A New Mechanism to Boost Boron Removal by Calcined Oyster Shell Powder

Phosphorus Co-Existing in Water: A New Mechanism to Boost Boron Removal by Calcined Oyster Shell Powder

Boron doped Hydroxapatites in Biomedical Applications

Boron recovery from high boron containing wastewater using modified sub-micron Ca(OH)2 particle

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