Uranium

Keith, Larry S.; Faroon, Obaid

doi:10.1016/b978-0-12-822946-0.00032-5

Cited by 8 publications

(4 citation statements)

References 327 publications

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“…The radioactive metal Uranium has a silvery color and is found in water, soil, and rocks contain traces of Uranium. Three isotopes make up natural Uranium: 234 U, 235 U, and 238 U but 238 U are the most common types of it [1]. 238 U makes up more than 99 percent of all Uranium found in nature and alpha radiations are emitted during the decay process.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of natural radioactivity and radiological hazards in water sample of Tounsa Sharif, South Punjab, Pakistan

Ishaq,

Nasir,

Ali

et al. 2024

Phys. Scr.

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Radioactive material, especially Uranium, is very dangerous for human beings, creatures, and plants. It has been documented that the groundwater of the Dera Ghazi Khan Division in Punjab is contaminated with 238U. In this communication, the groundwater of the Tehsil Taunsa located at Indus River has been investigated. 144 samples of drinking water were collected from 48 villages/towns located in the area of about 500 km2 of the city. The samples were collected in the month of June, August and November, to concentrate on the temperature impact over the Uranium concentration. All samples were analyzed for 238U concentration using a fluorometric technique. The fluorometric technique was applied after pre-treatment of the sample. The analysis of the result revealed that groundwater obtained from this region contains a high value of 238U contents. Among the 48 trials, 26 samples were found below the permissible limit, while the remaining samples contained 238U contents above the permissible level. The sample collected from areas like, Qarim Wala, Jhoke Jamki, Basti peer, Tibi Qaisrani, Pehar Adda & Malana contained even up to the alarming level (30µg/L to 54µg/L). In addition, it was observed that the sampling period had a significant effect on the contents, which were most prominent in June. This area being almost annually flooded by water from Rodh Kohi, who originated from Koh-e-Suleiman, may lead to such a high concentration of 238U. The additional reason could be the topographical and geological structure of the earth from which the samples were collected.

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Section: Introductionmentioning

confidence: 99%

Evaluation of natural radioactivity and radiological hazards in water sample of Tounsa Sharif, South Punjab, Pakistan

Ishaq,

Nasir,

Ali

et al. 2024

Phys. Scr.

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“…However, the pH of groundwater is greatly decreased, thus changing the original geochemical environment, and the resultant uranium ions might enter the food chain and cause degenerative changes to human lungs, bones, and nerve tissues and even cause inherited genetic defects. [4][5][6][7][8] Therefore, it is urgent to remediate uranium-contaminated groundwater in acid in situ leach uranium mines. Many technologies such as chemical reduction fixation, adsorption, ion exchange, permeable reactive barriers, photocatalysis, electrocoagulation and biological methods have been developed to alleviate U(VI) contamination.…”

Section: Introductionmentioning

confidence: 99%

Preparation of carboxy methyl cellulose stabilized nano-sized zero-valent iron and its properties for in situ remediation of groundwater in areas after acid in situ leach uranium mining

Zhang

Ding

et al. 2023

Environ. Sci.: Water Res. Technol.

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“…The recovery of uranium from natural seawater, river water, stagnant water and industrial wastewater is also a priority research topic [8].The main strategy of 2 nuclear waste management discussed worldwide is their disposal in deep geological formations, where salt dome, crystalline rocks and clay rocks are considered potential areas for nuclear waste storage [9].On the other hand, it is known that in a nuclear waste repository hosted by clay rock, radioactive decay of actinides and their fission products can cause high temperature increases of up to 100 o C near waste containers [10,11].Determining the transport regime and amount of radioactive contaminants within aquifers, soils, or rock formations requires detailed knowledge of the geochemistry of the system and radionuclide retention mechanisms such as adsorption, association, and precipitation. The World Health Organization (WHO) and the United States Environmental Protection Agency (USEPA) recommend limit values of 0.015 and 0.030 mg/L, respectively, for the maximum uranium concentration in drinking water [12]. The retention potential of radio pollutants largely depends on their adsorption/desorption behavior [13].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Uranium (VI) from Aqueous Solution Using Melamine Formaldehyde Organo Clay Nanocomposite Foam as a Novel Adsorbent

Gürses,

Sehhatigdiri,

Yılmaz

et al. 2023

Preprint

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Uranium is a toxic radioactive element and is usually found in the environment in hexavalent form. It has become a necessity to remove uranium, which can enter the environment in excessive amounts through nuclear industrial activities, from access waters. Melamine formaldehyde organo clay nano composite foam (MFCNCF) was prepared as a novel adsorbent by hardening with thermal treatment. Structural, crystallographic textural and surface morphological characterization of the prepared adsorbent was made by FTIR and XRD spectroscopic and SEM and HRTEM microscopic techniques. This study aims to investigate the adsorption of U(VI) from aqueous solution by MF organo clay nanocomposite and its dependence on various variables such as initial uranium concentration, adsorption time, adsorbent dosage, initial pH, and temperature. Additionally, adsorption isotherm analysis and adsorption kinetics and thermodynamics were also examined. For this purpose, the batch adsorption experiments were carried out and the equilibrium concentration of U(VI) in the aqueous solution was measured with a UV-Vis spectrophotometer at a wavelength of 433 nm, which corresponds to its maximum absorptivity. The results regarding adsorption kinetics show that 30 min is sufficient to reach adsorption equilibrium and the data show a high fit to the pseudo-second-order kinetic model. Isotherm analysis also revealed a high fit of the data to the Type III isotherm and the Halsey model. Based on this fit, an adsorption mechanism involving two regions (electrostatic and complex formation) was proposed for the current adsorption system. The adsorption isosteric enthalpy and entropy values for the first and second regions are 3.65 and -51.02kJ/mol and 1.77 and -167.28J/mol, respectively. It was found in kmol. Experimental results showed that the prepared nanocomposite foam adsorbent is an effective and potential alternative for the effective removal of U(VI) from aqueous solutions.

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Uranium

Cited by 8 publications

References 327 publications

Evaluation of natural radioactivity and radiological hazards in water sample of Tounsa Sharif, South Punjab, Pakistan

Evaluation of natural radioactivity and radiological hazards in water sample of Tounsa Sharif, South Punjab, Pakistan

Preparation of carboxy methyl cellulose stabilized nano-sized zero-valent iron and its properties for in situ remediation of groundwater in areas after acid in situ leach uranium mining

Adsorption of Uranium (VI) from Aqueous Solution Using Melamine Formaldehyde Organo Clay Nanocomposite Foam as a Novel Adsorbent

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