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2013 | 22 | 2 |

Tytuł artykułu

Bacteria-modified red mud for adsorption of cadmium Ions from aqueous solutions

Warianty tytułu

Języki publikacji

EN

Abstrakty

EN
Cadmium is a toxic metal widely used in industry and it enters the environment from electroplating, smelting, alloy manufacturing, pigments, plastics, cadmium-nickel batteries, fertilizers, pesticides, mining, pigments and dyes, textile operations, and refining industries. Considering the harmful effects of cadmium, it is necessary to remove cadmium from liquid wastes at least to the limit accepted by regulations. The present study describes removal of cadmium from aqueous solutions using bacteria-modified red mud waste material. Batch adsorption experiments have been performed as a function of pH, contact time, temperature, and adsorbent dosage. The optimum results were obtained at pH 4.0, contact time of 60 min, temperature of 30ºC, and an adsorbent dose of 1 mg/mL. The adsorption data was correlated with Langmuir and Freundlich adsorption models. The maximum adsorption capacity obtained from Langmuir adsorption model was 83.034 mg/g. The kinetic processes of cadmium adsorption on bacteria-modified red mud were described by applying pseudo-first-order and pseudo-second-order rate equations. The kinetic data for the adsorption process obeyed pseudo-second-order rate equations. Various thermodynamic parameters, such as ΔG°, ΔH°, and ΔS° were calculated and the negative value of ΔG° obtained indicate that the process was spontaneous, and the positive value of ΔH° confirms the reaction to be endothermic, and the positive value of ΔS° shows that the decrease in the degree of freedom of the adsorbed species. The bacteria-modified red mud investigated in this study exhibited a high potential for the removal of cadmium from aqueous solutions.

Słowa kluczowe

Wydawca

-

Rocznik

Tom

22

Numer

2

Opis fizyczny

p.417-429,fig.,ref.

Twórcy

autor
  • Geological Engineering Department, Oltu Earth Sciences Faculty, Ataturk University, 25400 Oltu-Erzurum, Turkey
autor
  • Department of Food Technology, Erzurum Vocational School, Ataturk University, 25240 Erzurum, Turkey
autor
  • Department of Biotechnology, Agriculture Faculty, Ataturk University, 25240 Erzurum, Turkey
autor
  • Primary Department, Bayburt Education Faculty, Bayburt University, 69000 Bayburt, Turkey
autor
  • Department of Food Technology, Erzurum Vocational School, Ataturk University, 25240 Erzurum, Turkey

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