Interactions between Silicon Oxide Nanoparticles (SONPs) and U(VI) Contaminations: Effects of pH, Temperature and Natural Organic Matters

Wu, Haixia; Li, Ping; Pan, Duoqiang; Yin, Zhuoxin; Fan, Qiaohui; Wu, Wangsuo

doi:10.1371/journal.pone.0149632

Cited by 12 publications

(7 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The enhanced Ni(II) adsorption induced by temperature increase indicated that Ni(II) adsorption was endothermic, in accordance with the results of Ni(II) adsorption on illite [9], smectite [38], and palygorskite [10]. The temperature effect raised the rate of approaching equilibrium [9,36]. Moreover, the Langmuir fits evidenced that monolayer adsorption of Ni(II) occurred on both micro-HAP and nano-HAP even in the desorption process (Figure 6), except for the adsorption at 318 K (fitted by Freundlich model, data not shown).…”

Section: Effect Of Ionicsupporting

confidence: 84%

“…One noticed that the correlation coefficient of the pseudo-second-order model was much closer to the unity of both two types of HAP (micro-HAP: R 2 = 0.9960 ; nano-HAP: R 2 = 0.9999 ), suggesting that the chemistry adsorption of Ni(II) on HAP possibly be rete-limited by two different affected by two variables. The Weber-Morris model revealed that during that adsorbate uptake varies were controlled by more than one mechanism since the plot was multilinear in Figure 3 [36, 37]. The initial stage was attributed to the exterior boundary layer diffusion or instantaneous adsorption of the most readily available adsorbing sites on the HAP surface [37], while the second stage can be ascribed to the interior boundary layer diffusion [36].…”

Section: Resultsmentioning

confidence: 99%

“…Kinetic and thermodynamic fit employed several validated models, such as pseudo-second-order, Weber-Morris, and Langmuir models, and described in detail in previous works [36, 37]. Thus, the equations and parameters would not repeat and mainly displayed key information.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Study on the Behaviors and Mechanism of Ni(II) Adsorption at the Hydroxyapatite-Water Interface: Effect of Particle Size

Zhao

Pan

et al. 2022

Adsorption Science & Technology

Self Cite

View full text Add to dashboard Cite

Hydroxyapatite (HAP) was a highly efficient decontamination material for its strong adsorption capacity used in the immobilization of heavy metals, while the particle-size effect was insufficiently investigated during the sorption process. In the present study, the mechanisms of nickel (Ni(II)) adsorption on HAPs with two different particle sizes were investigated by combing batch experiments, desorption, and XRD analysis. The results showed that the adsorption capacity of 20 nm HAP (nano-HAP) was much higher than that of 12 μm HAP (micro-HAP). It was noticed that the results of the present study also clarified the distinct mechanisms in each adsorption process. As for micro-HAP, Ni2+ adsorbed through slow diffusion and replacement with Ca2+ and then incorporated in the lattice at pH between 6.5 and 9.0, which was confirmed by the results of kinetics, thermodynamics, and desorption. And a more compact crystalline structure and irreversible desorption behavior of micro-HAP after Ni(II) adsorption was confirmed by results of XRD and desorption isotherms, respectively. At pH > 9.0 , lattice incorporation and precipitation controlled together. However, for nano-HAP, the sharp increase of Ni(II) adsorption and ionic strength dependent at pH 6.5 to 9.0 revealed that the dominant mechanisms were ionic exchange and inner-sphere complexation. XRD results showed that characteristic peaks of cassidyite appeared in Ni(II)-loading nano-HAP. At pH > 9.0 , a precipitate of Ni(II) was the dominant mechanism. The experimental finds demonstrated that nanoscale HAP was a more fast, efficient, and desorbable adsorbent than micro-HAP for Ni(II) removal. These findings would be favorable for investigating the removal mechanisms of heavy metals on the HAP materials and designing the synthesis methods.

show abstract

Section: Effect Of Ionicsupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Study on the Behaviors and Mechanism of Ni(II) Adsorption at the Hydroxyapatite-Water Interface: Effect of Particle Size

Zhao

Pan

et al. 2022

Adsorption Science & Technology

Self Cite

View full text Add to dashboard Cite

show abstract

“…Many cost-effective and ecofriendly adsorbents with components ubiquitous in the environment have been fabricated to remove U(VI) or other heavy metal ions, including iron and manganese oxides or hydroxides, organic matter, silicates, phosphate minerals, clay minerals and their modified forms [11][12][13][14][15][16][17]. Hydroxyapatite [Ca 10 (PO 4 ) 6 (OH) 2 , HAP] is a promising absorbent material because it can effectively immobilize considerable amounts of U(VI) due to its unique physical, chemical, mechanical, and biological properties [18,19].…”

Section: Introductionmentioning

confidence: 99%

Fast and Efficient Removal of Uranium onto a Magnetic Hydroxyapatite Composite: Mechanism and Process Evaluation

Tao

Peng

et al. 2021

Processes

View full text Add to dashboard Cite

The exploration and rational design of easily separable and highly efficient sorbents with satisfactory capability of extracting radioactive uranium (U)-containing compound(s) are of paramount significance. In this study, a novel magnetic hydroxyapatite (HAP) composite (HAP@ CoFe2O4), which was coupled with cobalt ferrite (CoFe2O4), was rationally designed for uranium(VI) removal through a facile hydrothermal process. The U(VI) ions were rapidly removed using HAP@ CoFe2O4 within a short time (i.e., 10 min), and a maximum U(VI) removal efficiency of 93.7% was achieved. The maximum adsorption capacity (Qmax) of the HAP@CoFe2O4 was 338 mg/g, which demonstrated the potential of as-prepared HAP@CoFe2O4 in the purification of U(VI) ions from nuclear effluents. Autunite [Ca(UO2)2(PO4)2(H2O)6] was the main crystalline phase to retain uranium, wherein U(VI) was effectively extracted and immobilized in terms of a relatively stable mineral. Furthermore, the reacted HAP@CoFe2O4 can be magnetically recycled. The results of this study reveal that the suggested process using HAP@CoFe2O4 is a promising approach for the removal and immobilization of U(VI) released from nuclear effluents.

show abstract

“…Different techniques such as sorption, precipitation, reduction, and membrane and ion exchange have been sought to preconcentrate uranium from aqueous solutions, among which the sorption technique has drawn interest because of its high efficiency, easy operation, and low cost. Many sorbents such as minerals, oxides, and nanomaterials have been proposed for the preconcentration and purification of contaminated water bodies; however, the shortage that limits sorption selectivity for natural minerals, high cost, and environmental unfriendliness for nanomaterials restrict further industrial applications. Thus, economical and environmentally friendly sorbents with prominent sorption capacity and selectivity need to be developed for the preconcentration of uranium contaminants from a considerable volume of aqueous solutions around nuclear facilities …”

Section: Introductionmentioning

confidence: 99%

Succinamic Acid Grafted Nanosilica for the Preconcentration of U(VI) from Aqueous Solution

Fan

Pan

et al. 2017

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

Succinamic acid-functionalized nanosilica (SA@SiO 2 ) was synthesized, characterized, and tested for hexavalent uranium preconcentration from contaminated aqueous solutions. The succinamic acid grafted nanosilica exhibited improved uranium preconcentration capacity in comparison with that of raw nanosilica. The effects of environmental conditions such as pH, ionic strength, solid concentration, foreign ions, and temperature on uranium(VI) preconcentration performance were investigated by batch technique in detail, and the related mechanism is discussed with the aid of X-ray photoelectron spectroscopy. Results showed that U(VI) preconcentration by SA@SiO 2 was strongly dependent on pH while less dependent on ionic strength; the preconcentration was mainly dominated by inner-sphere surface complexation. The coexisting cations had no effects, while anions influenced U(VI) preconcentration significantly. The preconcentration of U(VI) was favorable at lower temperatures; the maximum preconcentration capacity was 44.5 mg/g at pH 4.0 ± 0.1 and T = 298 K. Thermodynamic parameters indicated that the preconcentration process was exothermic and spontaneous. The SA@SiO 2 exhibited desirable selectivity for uranium and can be reused at least five times without decreasing capacity. Accordingly, the SA@SiO 2 is a potential and suitable candidate for the preconcentration of U(VI) from a considerable volume of contaminated water.

show abstract

Interactions between Silicon Oxide Nanoparticles (SONPs) and U(VI) Contaminations: Effects of pH, Temperature and Natural Organic Matters

Cited by 12 publications

References 48 publications

Study on the Behaviors and Mechanism of Ni(II) Adsorption at the Hydroxyapatite-Water Interface: Effect of Particle Size

Study on the Behaviors and Mechanism of Ni(II) Adsorption at the Hydroxyapatite-Water Interface: Effect of Particle Size

Fast and Efficient Removal of Uranium onto a Magnetic Hydroxyapatite Composite: Mechanism and Process Evaluation

Succinamic Acid Grafted Nanosilica for the Preconcentration of U(VI) from Aqueous Solution

Contact Info

Product

Resources

About