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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Eggshell and coral wastes as low cost sorbents for the removal of pb
2+
, cd
2+
and cu
2+
from aqueous solutions
Journal of Industrial and Engineering Chemistry, Volume 18, No. 1, Year 2012
Notification
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Description
Rapid industrialization in Korea has led to the discharge of heavy metals to water, posing a threat to the environment. The use of natural materials as low cost sorbents for the removal of heavy metals from aqueous solutions has recently received increasing attention. The present study was conducted to evaluate the effectiveness of eggshell and coral wastes for the removal of Pb 2+, Cd 2+ and Cu 2+ from aqueous solutions. Batch equilibrium experiments were conducted using heavy metal solutions with waste eggshell and coral powders. Langmuir and Freundlich adsorption models were used for the mathematical description of sorption equilibrium. The maximum amounts of metals (Cu 2+, Pb 2+ and Cd 2+) adsorbed were found to be 32.3, 22.9 and 4.47mmolkg -1 for eggshell and 6.77, 5.52 and 1.03mmolkg -1 for coral wastes, respectively. At low initial concentrations the adsorption of heavy metals onto both sorbents can be described as H-type (except for the Cd adsorption onto coral), indicating high-affinity isotherms and strong adsorbate-adsorptive interactions such as inner sphere complexes. However, the metal adsorption was described by L-type isotherm at high initial concentrations. Based on the distribution coefficient (K d) values and the percentage of metal removed, the selectivity sequence in eggshells and coral wastes was found to be Pb 2+>Cu 2+>Cd 2+. The K d values and the percentage of metals removed were higher in eggshells than coral with its higher capacity to adsorb heavy metals. Based on the results of the present study, eggshell and coral wastes can be used for the removal of heavy metals from aqueous solutions. © 2011 The Korean Society of Industrial and Engineering Chemistry.
Authors & Co-Authors
Ahmad, Mahtab
South Korea, Chuncheon
Kangwon National University
Usman, Adel Rabie Ahmed
South Korea, Chuncheon
Kangwon National University
Egypt, Asyut
Faculty of Agriculture
Lee, Sang-soo
South Korea, Chuncheon
Kangwon National University
Kim, Sung Chul
South Korea, Chuncheon
Kangwon National University
Joo, Jin-ho
South Korea, Chuncheon
Kangwon National University
Yang, Jae-eui
South Korea, Chuncheon
Kangwon National University
Ok, Yong Sik
South Korea, Chuncheon
Kangwon National University
Statistics
Citations: 183
Authors: 7
Affiliations: 2
Identifiers
Doi:
10.1016/j.jiec.2011.11.013
ISSN:
1226086X
e-ISSN:
22345957
Research Areas
Environmental