Thermodynamical and mechanistic studies of direct Red-28 dye adsorption on Syzygium cumini stem. | [Journal of Chemical Society of Pakistan • 2012]

Author(s):

1. Rabia Rehman: Institute of Chemistry, University of the Punjab, Lahore-54590, Pakistan

2. Tariq Mahmud: Institute of Chemistry, University of the Punjab, Lahore-54590, Pakistan

3. Muhammad Salman: Institute of Chemistry, University of the Punjab, Lahore-54590, Pakistan

4. Aadil Abbas: Department of Chemistry, University of Gujrat, Gujrat-50700, Pakistan

5. Saba Akbar: Department of Chemistry, University of Gujrat, Gujrat-50700, Pakistan

Abstract:

Many industries use various kinds of dyes for imparting color into their products. The discharge of these dyes into fresh water streams is visible, undesirable and lethal for organisms. The process of adsorption using different agro-waste has a good potential to remove color from water. A novel adsorbent i.e. powdered stem of Syzygium cumini is employed for elimination of Direct Red-28 dye. Effect of chemical treatment with acid and base has also been investigated. The dye removal efficiency of adsorbent have been determined by investigating several factors like; pH, amount of adsorbent, contact time and temperature. Freundlich isotherm model was followed by the equilibrium data showing that physiosorption of Direct Red-28 dye occurred on heterogeneous surface of adsorbent. The results had shown that powdered stem of Syzygium cumini adsorbs 29.79 mg/g of the dye. Its acid treatment further enhances its adsorption capacity to 44.68 mg/g. The negative values of ΔGo also confirmed the feasibility of the process. Thus, it can be effectively employed for the removal of dye from waste water.

Page(s): 1156-1162

DOI: DOI not available

Published: Journal: Journal of Chemical Society of Pakistan, Volume: 34, Issue: 5, Year: 2012

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