Removal of U(VI) from aqueous media by hydrothermal cross-linking chitosan with phosphate group

Dong, Zhili; Qiu, Yan-fang; Dai, Ying; Cao, Xiaohong; Wang, Lin; Wang, Pan-feng; Lai, Zhongjun; Zhang, Wenlong; Zhang, Zhibin; Liu, Yunhai; Zhang, Le

doi:10.1007/s10967-016-4722-8

Cited by 12 publications

(5 citation statements)

References 50 publications

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“…When the pH was lower than the value of pH PZC , the surface of the material is positively charged, and U(VI) mainly existed in the form of UO 2 2+ , causing electrostatic repulsion and weakening of the adsorption of U(VI) at a relatively higher pH value. 52 3.3. Adsorption Kinetics.…”

Section: Resultsmentioning

confidence: 99%

“…With the increase of pH, the zeta potentials of SWCNH–COOH and SWCNH–TETA gradually reduced, and the corresponding pH values at the point of zero charges (pH PZC ) were 4.05 and 3.32, respectively. When the pH was lower than the value of pH PZC , the surface of the material is positively charged, and U(VI) mainly existed in the form of UO 2 2+ , causing electrostatic repulsion and weakening of the adsorption of U(VI) at a relatively higher pH value …”

Section: Resultsmentioning

confidence: 99%

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Efficient Removal of Uranium(VI) from Aqueous Solutions by Triethylenetetramine-Functionalized Single-Walled Carbon Nanohorns

Wang

Huang

et al. 2020

ACS Omega

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In the present study, SWCNH–COOH and SWCNH–TETA were fabricated using single-walled carbon nanohorns (SWCNHs) via carboxylation and grafting with triethylenetetramine (TETA) for uranium (VI) ion [U(VI)] removal. The morpho-structural characterization of as-prepared adsorbing materials was performed by transmission electron microscopy, X-ray diffractometry, Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). Several parameters including the pH value of the aqueous solutions, contact time, temperature, and U(VI) concentration were used to evaluate the sorption efficiency of SWCNH–COOH and SWCNH–TETA. The Langmuir isotherm model could well represent the as-obtained adsorption isotherms, and the kinetics was successfully modeled by pseudo-second-order kinetics in the adsorption process. The maximum adsorption capacity of SWCNH–TETA was calculated as 333.13 mg/g considering the Langmuir isotherm model. Thermodynamic studies showed that adsorption proved to be a spontaneous endothermic process. Moreover, SWCNH–TETA exhibited excellent recycling performance and selective adsorption of uranium. Furthermore, the possible mechanism was investigated by XPS and density functional theory calculations, indicating that the excellent adsorption was attributed to the cooperation capability between uranium ions and nitrogen atoms in SWCNH–TETA. This efficient approach can provide a strategy for developing high-performance adsorbents for U(VI) removal from wastewater.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Efficient Removal of Uranium(VI) from Aqueous Solutions by Triethylenetetramine-Functionalized Single-Walled Carbon Nanohorns

Wang

Huang

et al. 2020

ACS Omega

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“…The PZC (point of zero charge) of PZS-TPP/CNT/Fe 3 O 4 was about 3.7. When the pH value was higher than 3.7, the surface of the composite was negative and elecrostatic attraction facilitated positive species such as UO 2 (OH) + moving on the negatively charged adsorbent surface . When the pH value was below 3.7, the adsorption was favorable for cations.…”

Section: Resultsmentioning

confidence: 99%

“…The adsorbent was prepared according to the literature . In a typical run, 20 mg of PZS-TPP/CNT/Fe 3 O 4 , 1 g of sodium tripolyphosate (1% v/v), and 10 mL of CH 3 COOH (2%, v/v) were mixed and heated at 50 °C for 0.5 h. Then the mixture was moved into a PTFE reactor with a temperature of 150 °C for 0.5 day.…”

Section: Methodsmentioning

confidence: 99%

Fast and High Amount of U(VI) Uptake by Functional Magnetic Carbon Nanotubes with Phosphate Group

Liu

Zhao

Yuan

et al. 2018

Ind. Eng. Chem. Res.

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In the present study, PZS-TPP/CNT/Fe 3 O 4 was fabricated by carbon nantubes (CNTs) with polyphosphazene and magnetic particles for application in U(VI) removal. The structure of the synthesized composite was characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), a vibrating sample magnetometer (VSM), and X-ray photoelectron spectroscopy (XPS). Studies of the effects of pH values, U(VI) concentration, contact time, and adsorption temperature including competing ions and reusability to the uranium adsorption were conducted. The calculated q max from the Langmuir model was 606.06 mg/g. The possible mechanism was investigated by XPS about the uranium-adsorbed PZS-TPP/CNT/ Fe 3 O 4 , which revealed that the adsorption capacity was mainly due to the coordination ability of phosphoryl groups and nitrogen atoms in the polyphosphazene skeleton. This new material is promising for separation and safe disposal of radionuclides in water.

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“…The isoelectronic point of any adsorbent is crucial since it is an indicator of the point where maximum ionic adsorption takes place at specified pH point, and no uptake of adsorbate ions occur after that pH point, concerning ionic interactions. Hence, the isoelectronic point of raw vermiculite was obtained with given procedure (27): ∆pH value was calculated with the equation ∆pH = pHfinal -pHinitial and the ∆pH (y-axis) vs. pH initial (x-axis) were plotted (not shown). The intercept point of the graph with x-axis was accepted as an isoelectronic point of vermiculite and was determined as pH 7.…”

Section: Physicochemical Propertiesmentioning

confidence: 99%

Removal of Cesium From Aqueous Solution by Adsorption Onto Si̇vas-Yildizeli̇ (Turki̇ye) Vermiculite: Equilibrium, Kinetic and Thermodynamic Studies

Akalın¹,

Hiçsönmez²,

Yılmaz³

2017

Journal of the Turkish Chemical Society, Section A: Chemistry

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In this study, cesium adsorption performance of raw vermiculite obtained from Sivas-Yıldızeli region of Turkey was investigated using batch adsorption method. In order to obtain the optimum adsorption conditions; different adsorbent dosages, contact times, solution pH's, initial cesium concentrations and temperature ranges were investigated. The concentration of cesium in solution was determined by ICP-OES. Kinetic studies demonstrated that adsorption process was in accordance with pseudo-second order kinetic model and equilibrium isotherm modeling studies showed that the process was compatible with Langmuir, Freundlich and Temkin adsorption isotherm models, indicating that Cs adsorption process had both physical and chemical character. Negative Gibbs energy values obtained from thermodynamic studies revealed that the adsorption process was spontaneous and had a high feasibility. Additionally, the negative enthalpy value indicated that process was exothermic, suggesting that the adsorbed Cs + ions decreased with increasing reaction temperatures. Positive entropy value showed that disorderliness between solid-liquid phase increased during adsorption. Results clearly indicate that vermiculite mineral has a promising potential in removing Cs + ions from aqueous media which leads mineral may also be used in decomposing and efficiently removing radioactive cesium from contaminated waters.

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Removal of U(VI) from aqueous media by hydrothermal cross-linking chitosan with phosphate group

Cited by 12 publications

References 50 publications

Efficient Removal of Uranium(VI) from Aqueous Solutions by Triethylenetetramine-Functionalized Single-Walled Carbon Nanohorns

Efficient Removal of Uranium(VI) from Aqueous Solutions by Triethylenetetramine-Functionalized Single-Walled Carbon Nanohorns

Fast and High Amount of U(VI) Uptake by Functional Magnetic Carbon Nanotubes with Phosphate Group

Removal of Cesium From Aqueous Solution by Adsorption Onto Si̇vas-Yildizeli̇ (Turki̇ye) Vermiculite: Equilibrium, Kinetic and Thermodynamic Studies

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