Preparation of Eggshell Powder/Low Density Polyethylene Composites and Their Acid Dye Removal Efficiency



This study focused on the preparation of eggshell powder (ESP)/low density polyethylene (LDPE) composites and the acid dye (Acid Yellow 137) removal efficiency of the prepared composites. ESP was prepared using a domestic coffee grinder and then sieved to determine the particle size distribution. The smallest particle size of ESP obtained was ≤ 45 µm which was used in ESP/LDPE composite preparation. ESP (45 µm) concentrations of 30, 50 and 70 wt% were incorporated into LDPE using an internal mixer, then extruded and cut into pellet form using a twin screw extruder. Batch adsorption experiments were carried out as a function of contact time and adsorbent dosage. Dye removal efficiency was determined using UV-Vis spectrophotometry and found to be dependent on ESP concentration and adsorbent dosage. The highest removal efficiency was 18 % for the 70 wt% ESP/LDPE composite. Results from the Brunauer-Emmett-Teller (BET) technique showed that surface area increased with ESP content and was highest at 0.71 m2.g-1 for the 70 wt% ESP/LDPE composite. SEM micrographs revealed that the large surface area of 70 wt% ESP/LDPE composite was due to a significant amount of ESP protruded from the pellet surface. The process kinetics of ESP and its composites were found to follow the pseudo-second order rate equation. Although, the maximum dye removal efficiency of the composite was 2.6 times lower than that of 45 µm ESP at the same adsorbent dosage, the ease of adsorbent recovery after utilization of the composite was significantly improved over that of ESP.


Eggshell powder, composite, acid dye, adsorption kinetics, waste water treatment

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