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Journals / Celal Bayar Üniversitesi Fen Bilimleri Dergisi / 2017 / Cilt: 13 - Sayı: 3

Investigation of the Kinetic and Thermodynamic Properties of U(VI) Ions onto Raw and Modified Diatomite

U(VI) İyonlarının Ham ve Modifiye Edilmiş Diyatomit Üzerine Adsorpsiyon Özelliklerinin Kinetik ve Termodinamik Olarak İncelenmesi

Sabriye YUŞAN
Pages
761–768
Publication Date
2017-09-30
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The adsorption process was examined kinetically according to obtained data from adsorption studies at three different concentrations, and it was found adsorption process was best described by the pseudo-second-order model with chemical adsorption.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:In this study, the removal of uranium from aqueous solutions by natural and modified diatomite has been investigated.
📊
Key Findings & Data:SEM, XRD and TGA/DTA analysis techniques were used for the characterization of natural and acid modified diatomite samples as adsorbents.
💡
Conclusion & Impact:The adsorption process was examined kinetically according to obtained data from adsorption studies at three different concentrations, and it was found adsorption process was best described by the pseudo-second-order model with chemical adsorption.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:Adsorpsiyon · Diyatomit · Kinetik parametreler

Abstract

In this study, the removal of uranium from aqueous solutions by natural and modified diatomite has been investigated. SEM, XRD and TGA/DTA analysis techniques were used for the characterization of natural and acid modified diatomite samples as adsorbents. The adsorption process was examined kinetically according to obtained data from adsorption studies at three different concentrations, and it was found adsorption process was best described by the pseudo-second-order model with chemical adsorption. The effect of temperature on the adsorption was also examined and thermodynamic parameters were calculated. Positive enthalpy calculated for both adsorbents have shown that the adsorption process is endothermic. In addition negative values of free energy change indicated the spontaneity of the adsorption at the studied temperatures. The positive values of entropy show the increasing randomness at the solid/solution interface during the adsorption process.

Özet

Bu çalışmada, giderimi ham ve asit ile modifiye edilmiş diyatomit kullanılarak uranyumun sulu çözeltilerden uzaklaştırılabilirliği araştırılmıştır. Adsorban olarak kullanılan ham ve asit modifiyeli diyatomit örneklerinin karakterizasyonu için SEM, XRD ve TGA/ DTA analiz teknikleri kullanılmıştır. Adsorpsiyon kinetiğinin incelenmesi için üç farklı konsantrasyon ile çalışılmıştır. Elde edilen verilere göre hem ham, hem de asit modifiyeli diyatomit adsorbanı üzerine uranyum iyonlarının adsorpsiyon prosesinin yalancı II. mertebe üzerinden kimyasal adsorpsiyon ile gerçekleştiği görülmüştür. Ayrıca adsorpsiyona sıcaklığın etkisi incelenmiş ve termodinamik parametreler hesaplanmıştır. Her iki adsorban içinde hesaplanan pozitif entalpi, adsorpsiyon prosesinin endotermik olduğunu göstermiştir. Bununla birlikte yine her iki adsorban içinde negatif serbest enerji değişimi, adsorpsiyon prosesinin çalışılan sıcaklıklarda kendiliğinden gerçekleştiğini göstermiştir. Entropinin pozitif değerleri ise, adsorpsiyon prosesi sırasında katı/çözelti ara yüzeyindeki gelişi güzel tutunmanın arttığını göstermiştir.

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Cite This Article

YUŞAN, S. (2017). Investigation of the Kinetic and Thermodynamic Properties of U(VI) Ions onto Raw and Modified Diatomite. Celal Bayar Üniversitesi Fen Bilimleri Dergisi, Cilt: 13 - Sayı: 3, 761–768. https://ajindex.com/articles/114987

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References (13)

  1. Veglio, F, Beolchini, F, Removal of metals by biosorption: a review, Hydrometallurgy, 1997, 44, 301-316
  2. Volesky, B, Biosorption of Heavy Metals, CRC Press, Florida, 1990; pp 396
  3. Wase, J, Forster, C, Biosorbents for Metal Ions, Taylor&Francis Ltd., London, 1997; pp 238
  4. Toxicological profile for uranium. U.S. Department of Health and Human Services, Agency for Toxic Substances and Disease Registry. http://www.atsdr.cdc.gov/toxprofiles/tp150.pdf/, 2011 (accessed 25.10.2016)
  5. Lawrence, D.G, Uranium toxicity literature with commentaries, Department of Chemistry and Biochemistry, Long Island University, Brooklyn, 2004
  6. Nilchi, A, Dehaghan, T.S, Garmarodi, S.R, Kinetics, isotherm and thermodynamics for uranium and thorium ions adsorption from aqueous solutions by crystalline tin oxide nanoparticles, Desalination, 2013, 321, 67–71
  7. Bampaiti, A, Misaelides, P, Noli, F, Uranium removal from aqueous solutions using a raw and HDTMA-modified phillipsite-bearing tuff, Journal of Radioanalytical and Nuclear Chemistry, 2015, 303(3), 2233–2241
  8. Hoshikawa, T, Kawamura, F, Sawaa, T, Suzuoki, A, Kumagai, M, Takashima, Y, Asou, M, Namba, T, Kinumaki, H, Ohe, S, A new concept of nuclear fuel reprocessing by applying ion-exchange technology, Progress in Nuclear Energy, 1998, 32(3-4), 365-371
  9. Slater, S.A, Raraz, A.G, Willit, J.L, Gay, E.C, Electrochemical separation of aluminum from uranium for research reactor spent nuclear fuel applications, Separation and Purification Technology, 1999, 15(3), 197-205. 10. [Mellah, A, Chegrouche, S, Barkat, M, The removal of uranium (VI) from aqueous solutions onto activated carbon: kinetic and thermodynamic investigations, Journal of Colloid and Interface Science, 2006, 296, 434-441
  10. Deliyanni, E.A, Bakoyannakis, D.N, Zouboulis, A.I, Matis, K.A, Sorption of As(V) ions by akaganeite-type nanocrystals, Chemosphere, 2003, 50, 155–163
  11. Aytas, O.S, Akyil, S, Aslani, M.A.A, Aytekin, U, Removal of uranium from aqueous solutions by diatomite (Kieselguhr), Journal of Radioanalytical and Nuclear Chemistry, 1999, 240 (3), 973-976
  12. Yusan, S, Gok, C, Erenturk, S, Aytas, S, Adsorptive removal of thorium (IV) using calcined and flux calcined diatomite from Turkey: Evaluation of equilibrium, kinetic and thermodynamic data, Applied Clay Science, 2012, 67–68, 106–116
  13. Sprynskyy, M, Kovalchuk, I, Buszewski, B, The separation of uranium ions by natural and modified diatomite from aqueous solution, Journal of Hazardou