Natural adsorbent made from eggshells for removal of chromium (VI) in water

Abdul Latif, Amirul Faiz and Loh, Siew Yee and Muhamad, Mimi Suliza and Lee, Te Chuan and Basri, Hatijah (2022) Natural adsorbent made from eggshells for removal of chromium (VI) in water. Biointerface Research in Applied Chemistry, 12 (1). pp. 518-528.

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Substantial utilization of heavy metals in various industrial processes nowadays had cause heavy metal pollutions in the water. Hexavalent chromium, Cr (VI), is one of the heavy metals which has been extensively used in alloy pigment production and surface treatment. The present work reports natural adsorbent synthesis made from eggshell to reduce Cr (VI) in water. The eggshell adsorbents were prepared by several steps that include boiling, drying, calcination at 900 °C, grinding, pH adjustment, precipitation, and filtration. XRD results displayed a highly crystalline hydroxyapatite (HAp) peak that was successfully synthesized. FESEM analysis showed the morphology of the powder that was agglomerate with irregular cloud-like shapes, while EDS results presented the elements in the eggshell powders that include calcium (Ca), phosphorus (P), and oxygen (O). FTIR analysis revealed the presence of hydroxyl group (OH-) that contribute to the adsorption process. The adsorption experiment demonstrates the highest Cr (VI) removal and adsorption capacity of 70% and 285.71 mg/g, respectively, was attained by 6 g adsorbent dosage within 1 hour. Kinetic studies of the adsorption process were best described by the pseudo-second-order model and Langmuir isotherm model with a high correlation coefficient of 0.98. This work's findings suggested that eggshells are potential natural adsorbent to reduce heavy metal pollutions, specifically Cr(VI) in water.

Item Type: Article
Uncontrolled Keywords: Hydroxyapatite; eggshells; chromium; adsorbent.
Subjects: T Technology > TD Environmental technology. Sanitary engineering > TD201-500 Water supply for domestic and industrial purposes > TD429.5-480.7 Water purification. Water treatment and conditioning. Saline water conversion
Divisions: Faculty of Technology Management and Business > Department of Prtoduction and Operation Management
Depositing User: Mr. Abdul Rahim Mat Radzuan
Date Deposited: 18 Oct 2021 06:22
Last Modified: 18 Oct 2021 06:22

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