Comparison of kinetics of Cr (III) ions removal from wastewater using raw and activated montmorillonite minerals
Küçük Resim Yok
Tarih
2021
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Univ Studi Bologna, Dept Agricultural Sciences
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this study, kinetics of the removal of Cr (III) from the waters by adsorption have been investigated using montmorillonite natural clay that was obtained from the vicinity of Narman, Erzurum in Turkey. Activation energy, thermodynamic values and adsorption kinetics were determined. In addition, the trials were repeated by subjecting to the same adsorbent activation process. The values found for these two adsorbents were compared. As a result of the experiments, the parameters affecting the adsorption kinetics were examined. It was determined that the adsorption process could be best depicted by pseudo second order reaction kinetics. Using pseudo second order reaction rate constants, Delta H degrees = -25.791 kJ mol(-1) and Delta S degrees = 106.19 joule mol(-1) were calculated for raw adsorbent. For the activated adsorbent, Delta H degrees = -18,806 kJ mol(-1) and Delta S degrees = 79.37 joule mol(-1) were calculated. That Delta G degrees increases as temperature increases indicates; adsorption is more spontaneous at high temperatures. Negative Delta H degrees values show that the reaction is exothermic. The positive values of Delta S degrees indicate increased randomness at the adsorbent/solution interface during the adsorption of chrome.
Açıklama
Anahtar Kelimeler
activated adsorbent, adsorption, Chrome removal, heavy metal removal
Kaynak
Eqa-International Journal of Environmental Quality
WoS Q Değeri
N/A
Scopus Q Değeri
N/A
Cilt
45
