Method of dye removal from wastewater
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example 1
Adsorption Studies
[0021]Adsorption experiments were conducted using 250 ml Pyrex glass bottles. 1000 ppm stock solutions were prepared for Rhodamine B (RB) and Methyl Orange (MO) using reagent grade chemicals and high-purity water. 100 ml test solutions were then prepared using high-purity water and respective stock solution. A blank sample was taken before the addition of the required powdered activated carbon (PAC) amount. This was followed by pH adjustment to the desired value using HCl or NaOH solutions. The test solution was then kept in suspension using IKA multi-position magnetic stirrer set-up. Kinetic studies were achieved by withdrawing samples at different time intervals for three hours. The effects of pH, PAC dosage and initial dye concentration were determined by running experiments until adsorption reached equilibrium. All samples collected were filtered with 0.2 μm membrane filters (Whatman, Germany) and the concentrations of RB and MO were analyzed using Shimadzu UV-...
example 2
Effect of Contact Time on the Removal of Rhodamine B
[0022]In a container comprising 30 ppm of Rhodamine B solution at pH 4, 2 g / L of powdered activated carbon (produced by the present methods) was added while stirring. The concentration of the Rhodamine B was monitored over time by a spectrophotometer. FIG. 1 shows the sample kinetic study findings for Rhodamine B from synthetic wastewater using the 2 g / L concentration. As shown in FIG. 1, most of the dye is removed from the aqueous phase within 30 minutes of adsorption time. After about three hours of contact time, the synthetic wastewater solution was very clear compared to the solution at the beginning of the experiment.
example 3
Effect of PAC Dosage and Dye Concentration in Synthetic Wastewater
[0023]Powdered activated carbon (PAC) obtained from phosphoric acid based chemical activation of heavy oil fly ash was added to synthetic wastewater containing 100 ppm of Rhodamine B (pH4). The concentration of the Rhodamine B was monitored by successively increasing the concentration of the powdered activated carbon (PAC). FIG. 2 depicts the effect of the powdered activated carbon dosage on the adsorption based removal of Rhodamine B from synthetic wastewater sample (Rhodamine B-100 ppm; solution pH=4). Several days were allowed to pass until adsorption equilibrium was reached. The findings clearly show that even a relatively high concentration of Rhodamine B (about 100 ppm) is efficiently removed from synthetic wastewater using powdered activated carbon (PAC) produced from heavy oil fly ash (OFA) waste material using chemical activation method as described herein.
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