WATER PURIFICATION FROM CHROMIUM IONS USING BENTONITES AND ADSORPTION THERMODYNAMICS

Authors

  • Khandamov Davron Abdikodirovich Tashkent Institute of Chemical Technology
  • Nurtayev Urinbay Nishanbekovich Chirchik Branch of M. Auezov South Kazakhstan University
  • Doniyorov Sarvar Allanazarovich Tashkent Institute of Chemical Technology
  • Bekmirzaev Akbarbek Shukhratovich Tashkent Institute of Chemical Technology
  • Ziyadullaev Anvar Egamberdievich Tashkent Institute of Chemical Technology

DOI:

https://doi.org/10.56122/..v2i2%20(26).487

Keywords:

бентонит, кислотная активация, изотерма адсорбции, термодинамика, энтальпия, энтропия, энергия Гиббса.

Abstract

This article examines the effectiveness of chromium ion removal from aqueous solutions using natural bentonite and its samples activated with sulfuric acid. According to the adsorption isotherms obtained at different temperatures (288–318 K), it was found that the maximum adsorption efficiency on all adsorbents is achieved at 298 K. For the Langmuir model, the coefficient of determination R² was high for all three adsorbents (DB: 0.996; DB25: 0.997; DB15: 0.998), indicating a good fit of the experimental data to this model. The values of 1/n and n in the Freundlich model for DB, DB25, and DB15 were 1.7, 1.81, and 2.03, respectively. Since n > 1, this confirms the favorable nature of the adsorption process. According to the Dubinin–Radushkevich model, the highest adsorption energy (E = 191.04 kJ/mol) was observed for DB15, indicating the presence of chemical adsorption as well.

References

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Published

2025-11-11

How to Cite

Khandamov, D., Nurtayev , U., Doniyorov , S., Bekmirzaev , A., & Ziyadullaev , A. (2025). WATER PURIFICATION FROM CHROMIUM IONS USING BENTONITES AND ADSORPTION THERMODYNAMICS. Bulletin of the Osh State Pedagogical University Named After A. Myrsabekova, 2(2 (26), 150–157. https://doi.org/10.56122/.v2i2 (26).487

Issue

Vol. 2 No. 2 (26) (2025): Bulletin of the Osh State Pedagogical University named after A. Myrsabekova

Section

Natural sciences

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