REMOVAL OF LEAD FROM WASTEWATER USING MODIFIED KAOLIN (ZEOLITE-X)
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Date
2023-07
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Addis Ababa University
Abstract
the objective of this study was to investigate the lead (II) ion removal efficiency of modified kaolin (zeolite X) from wastewater. By using batch experiments, zeolite-X was synthesized, characterized, and applied to adsorb lead from wastewater. In this study, the synthesis of zeolite-X was performed at 600 0C for 1 h in a muffle furnace from kaolin formed as meta-kaolin and then mixed with NaOH. The adsorbent was characterized using XRD, FTIR, SEM, and BET. The concentration of the lead ion was determined using atomic absorption spectrophotometer (AA 2400FS Varian. The XRD revealed that zeolite-X synthesized has a faujasite (FAU) phase, composed of cubic, rectangular, and irregular crystallite shapes as seen by SEM. The FTIR analysis revealed the presence of functional groups Si-O bonds associated with zeolite. The BET analysis show that the adsorbent is porous and has good surface area to adsorb lead. The effects different factors on the Lead (II) ion removal efficiency was studied in batch adsorption experiments. Results show that Lead (II) ion the removal efficiency of the prepared adsorbent was dependent on the pH, contact time, adsorbent dosage and Lead (II) ion initial concentration. Experiment results showed that maximum removal of lead (II) ion by zeolite-X at optimum condition ( 5.2 pH, 51.8min contact time, 4.506 g adsorbent dose and 12.8mg/L initial concentration of lead(II)ion) is 98.2 %..Adsorption data were interpreted in terms of Langmuir and Freundlich isotherms. It was observed that the experimental data fitted better to Langmuir model with a correlation factor (R2) value of 0.99996 compared to Freundlich with R2 value of 0.85075and the maximum adsorption capacity of the material was 39.67 mg of Pb/g of zeolite-X. The kinetic processes of Lead (II) ion adsorption on zeolite -X were described by applying pseudo-first-order and pseudo-second-order kinetic models. The kinetic data for the adsorption process obeyed a pseudo-second-order kinetic model with regression coefficients value of 0.999561, suggesting that the adsorption process is chemisorption. The synthesized zeolite -X showed good potential for the removal of Lead (II) ion from aqueous solution and it also removes lead (II) ion from the real Nefas silk paint industry waste water about 90.9%.
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Keywords
Kaolin, Zeolite-X, Adsorption, Lead (II) ion, wastewater