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Biosorption of heavy metal ions from aqueous solutions by activated sludge [An article from: Desalination]
Book Details
Author(s)Z. Al-Qodah
PublisherElsevier
ISBN / ASINB000P6OQDG
ISBN-13978B000P6OQD6
MarketplaceFrance 🇫🇷
Description
This digital document is a journal article from Desalination, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Biosorption experiments were performed using different pretreated activated sludge as bioadsorbent for Cu^2^+, Cd^2^+ and Ni^2^+. Pretreatment with NaOH was found to improve the adsorption capacity of the sludge where as treatment with HCl reduces it. The treated and untreated sludge show great affinity towards Cu^2^+, Cd^2^+ and low affinity towards Ni^2^+. The maximum loading capacity of the NaOH treated sludge was 131.6 and 93.4 mg/g for Cu^2^+ and Cd^2^+, respectively. It was found that both Langmuir and Freundlich isotherm models fit the adsorption data with the different types of sludge and ions. The value of R^2 exceeds 0.95 in most cases. It was found that the maximum adsorption capacity drops 18.3% as the temperature increases from 25 to 45^oC. The adsorption capacity was found to increase as the adsorbent mass and mixing speed increase. The optimum pH corresponding corresponds to maximum adsorption efficiency was found to be about 5. Desorption experiments indicate that the desorption efficiency with 0.1 M H"2SO"4 solution reaches 94% in the first cycle and decreases to 8% in the 4th cycle after collecting 20,700 mg Cd^2^+/l H"2SO"4.
Description:
Biosorption experiments were performed using different pretreated activated sludge as bioadsorbent for Cu^2^+, Cd^2^+ and Ni^2^+. Pretreatment with NaOH was found to improve the adsorption capacity of the sludge where as treatment with HCl reduces it. The treated and untreated sludge show great affinity towards Cu^2^+, Cd^2^+ and low affinity towards Ni^2^+. The maximum loading capacity of the NaOH treated sludge was 131.6 and 93.4 mg/g for Cu^2^+ and Cd^2^+, respectively. It was found that both Langmuir and Freundlich isotherm models fit the adsorption data with the different types of sludge and ions. The value of R^2 exceeds 0.95 in most cases. It was found that the maximum adsorption capacity drops 18.3% as the temperature increases from 25 to 45^oC. The adsorption capacity was found to increase as the adsorbent mass and mixing speed increase. The optimum pH corresponding corresponds to maximum adsorption efficiency was found to be about 5. Desorption experiments indicate that the desorption efficiency with 0.1 M H"2SO"4 solution reaches 94% in the first cycle and decreases to 8% in the 4th cycle after collecting 20,700 mg Cd^2^+/l H"2SO"4.
