The synthesis of super-small nano hydroxyapatite and its high adsorptions to mixed heavy metallic ions

Jing, Nan; Zhou, Annan; Xu, Qinghong

doi:10.1016/j.jhazmat.2018.02.049

Cited by 39 publications

(14 citation statements)

References 35 publications

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“…After the adsorption of Cd 2þ and Pb 2þ ions, the two hydroxyapatites were dried at 80°C overnight and their chemical compositions were determined by EDX (see data in Figure 3). The Ca/P molar ratio of HAP (1.657) was close to the stoichiometric data of 1.67 (Khoo et al 2015;Jing et al 2018). This result seems to be higher than that of C-HAP.…”

Section: Characterizationsupporting

confidence: 78%

“…The absorptions at 1,081 cm À1 and 1,030 cm À1 are attributed to the stretching vibrations of P ¼ O. The bands at 570 cm À1 , 601 cm À1 and 954 cm À1 correspond to the bending vibrations of P-O in PO 4 3À (Song et al 2016;Jing et al 2018). Moreover, the weak bands located between 1,460 cm À1 and 1,415 cm À1 are related to the CO 3 2À ; this band is similar to that found in layered double hydroxide (Cengiz et al 2008).…”

Section: Characterizationmentioning

confidence: 97%

“…These heavy metals are poured into water and groundwater from mining and petrochemicals industries (Li et al 2019). Therefore, numerous approaches such as chemical precipitation, adsorption, membrane process, and electrochemical treatment have been investigated to improve and purify the quality of water by reducing the concentration of heavy metals in wastewater (Mousa et al 2016;Jing et al 2018). Governments and environmental protection agencies fixed the limit values and guidelines recommended in terms of the allowable concentration for lead and cadmium in wastewaters from industrial effluents and drinking water.…”

Section: Introductionmentioning

confidence: 99%

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Lead and cadmium removal by adsorption process using hydroxyapatite porous materials

Ramdani

Kadeche

Adjdir

et al. 2020

Water Practice and Technology

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This contribution is a comparison study between synthetic hydroxyapatite (Sy-HAP) and commercial hydroxyapatite (C-HAP) for the removal of Pb2+ and Cd2+ ions present in wastewater from industrial effluents. The obtained results show that the equilibrium time required for complete adsorption of Pb2+ and Cd2+ ions on C-HAP and Sy-HAP is 15 min for both. The obtained removal efficiencies for Sy-HAP are 95.52% and 90.91% for Pb2+ and Cd2+ ions, respectively. Whereas, C-Hap presents lower removal efficiencies of 86.53% and 81.43% for Pb2+ and Cd2+ ions, respectively. Maximum adsorption was observed at pH 5; at lower pH levels adsorption was less. The experimental kinetic data fitted with the second order kinetic model. Thermodynamically, the adsorption process was endothermic and spontaneous in nature. Isotherm adsorption studies indicated that Langmuir, Freundlich and Temkin are the most valid models to describe and evaluate the adsorption process. The EDX results also confirmed the presence of lead and cadmium in adsorbents after adsorption. Finally, the HAP porous materials possess great potential for the removal of Pb2+ and Cd2+ ions from aqueous solutions and wastewater from industrial effluents.

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Section: Characterizationsupporting

confidence: 78%

Section: Characterizationmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Lead and cadmium removal by adsorption process using hydroxyapatite porous materials

Ramdani

Kadeche

Adjdir

et al. 2020

Water Practice and Technology

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“…This indicates that the Zn(II) and Pb(II) sorption process on various samples of HAP-based materials can actually be described using the pseudo-second-order kinetic model. Consequently, the rate determining step is chemical sorption [22][23][24][25]. Thus, the process of Zn(II) and Pb(II) from single and binar y solutions can be described as chemosorption.…”

Section: Resultsmentioning

confidence: 99%

Kinetic Studies of Zn(II) Removal from Single and Binary Solutions by Synthetic Hydroxyapatite - Based Nanopowders

Busuioc¹,

Simonescu²,

Nechifor³

et al. 2018

Rev. Chim.

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A kinetic study has been carried out with two hydroxyapatite nanopowders to establish the mechanism involved in heavy metals removal from aqueous synthetic solutions. The samples of nanohydroxyapatite have been previously characterized. The first sample represents a pure hydroxyapatite (HAP) nanopowder named HAP-1, and the second sample (HAP-2) consist of a mixture of hydroxyapatite (HAP; Ca10(PO4)6(OH)2) and b-tricalcium phosphate (b-TCP; Ca3(PO4)2). Batch experiments with single and binary Zn(II) and Pb(II) aqueous solutions have been performed. According to this research study, it was found that the both nanohydroxyapatite samples show good heavy metals adsorption capacity, and selectivity for Pb(II) ions. A more pronounced decreasing of sorption capacity of Zn(II) ions from binary solutions compared to that registered from single heavy metal ion solutions has been observed. From the kinetic point of view, the sorption process can be described for both heavy metals as a pseudo-second-order kinetic process. According to this model, the Zn(II) and Pb(II) sorption can be achieved by chemical reactions between heavy metals and functional groups of adsorbents. The obtained results are indicative of good hydroxyapatite adsorption ability towards Pb(II) and Zn(II) ions.

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“…In addition, previous studies mainly focused on whether a single-particle size HA dentifrice could block the dentinal tubules, and there is a lack of a comparative study for assessing the anti-sensitivity effect of a dentifrice containing different particle sizes of HA. Nano-HA are widely used in the area of heavy metal ion adsorbent 25. However, studies assessing the adsorption effect of a nano-HA dentifrice on heavy metal ions have been rarely reported.…”

Section: Introductionmentioning

confidence: 99%

<p>Effect of a dentifrice containing different particle sizes of hydroxyapatite on dentin tubule occlusion and aqueous Cr (VI) sorption</p>

Yuan¹,

Liu²,

Lv³

et al. 2019

IJN

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Background Dentin hypersensitivity is a common negative oral condition that can be treated with dentifrice containing hydroxyapatite (HA). The study evaluated the effect of nano-HA dentifrice on plugging the dentinal tubules for an anti-sensitivity reaction compared to a dentifrice containing common-sized particles. Also, the adsorption capacity of different particle sizes of HA mixed in a dentifrice and which is the optimal particle size was considered. Methods Fourty premolar dentine discs and fourty molar dentine discs were randomly divided into 4 groups: distilled water group, ordinary dentifrice group and 80, 300 nm HA dentifrice group. Each dentin disc was brushed with a dentifrice twice daily at 7600 rpm under 100 g force for 2 mins for 7 consecutive days and divided into two parts, half of the dentin disc was detected by the scanning electron microscope (SEM) and energy dispersive spectrometer (EDS), the other half was brushed with distilled water and observed by SEM. One milliliter dentifrice solution (80 nm HA dentifrice, 300 nm HA dentifrice, ordinary dentifrice) was added to 50 ml potassium dichromate solution for 1, 14, and 28 d. The residual Chromium (Cr 6+ ) concentration in the supernatant was measured by the diphenylcarbon phthalocyanine hydrazine method. The elemental constitution in the precipitate was detected by EDS. The Kruskal-Wallis test was used to analyze surface mineralization and different plugging rates of dentinal tubules. The absorption capacity of dentifrices were also evaluated by the Kruskal-Wallis test. Results The plugging rate in the HA dentifrice group was higher than that in the ordinary dentifrice group, and the 80 nm HA dentifrice group showed the best result. The atomic percentages of Ca and P of 80 nm dentifrice group on the surface of dentinal tubules were the highest. The 80 nm HA dentifrice group showed the best adsorption and stable effect of Cr 6+ , followed by the 300 nm HA dentifrice group. The 300 nm HA dentifrice and the ordinary dentifrice showed desorption phenomenon. Conclusions The dentifrice containing HA, especially the 80 nm HA dentifrice, exerts good dentinal tubule occlusion and surface mineralization effect. This dentifrice was also a good adsorbent of Cr 6+ .

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The synthesis of super-small nano hydroxyapatite and its high adsorptions to mixed heavy metallic ions

Cited by 39 publications

References 35 publications

Lead and cadmium removal by adsorption process using hydroxyapatite porous materials

Lead and cadmium removal by adsorption process using hydroxyapatite porous materials

Kinetic Studies of Zn(II) Removal from Single and Binary Solutions by Synthetic Hydroxyapatite - Based Nanopowders

<p>Effect of a dentifrice containing different particle sizes of hydroxyapatite on dentin tubule occlusion and aqueous Cr (VI) sorption</p>

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