Oyster Shell as a Low-Cost Adsorbent for Removing Heavy Metal Ions from Wastewater
Xin Xu 1  
Xiaofeng Liu 2  
Myounghak Oh 3  
Junboum Park 1  
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Department of Civil and Environmental Engineering, Seoul National University, Seoul, South Korea
College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan, China
Coastal Disaster Prevention Research Center, Korea Institute of Ocean Science and Technology, Busan, South Korea
Junboum Park   

Seoul national university
Online publish date: 2019-02-25
Publish date: 2019-04-09
Submission date: 2018-03-22
Final revision date: 2018-07-02
Acceptance date: 2018-07-05
Pol. J. Environ. Stud. 2019;28(4):2949–2959
Oyster shell powder is a potential adsorbent material that can be used to control pollution in groundwater. The current research objective is to evaluate the heavy metal ion adsorption properties by oyster shell powder in an aqueous solution. Three kinds of heavy metals (copper, cadmium, and lead) were adsorbed using oyster shell powder from aqueous solution. The effects of different temperatures, contact times, pH values, and initial concentrations were examined in order to optimize the conditions used for heavy metal decontamination. Cadmium and copper adsorption behaviours were suitable for modelling by the Langmuir isotherm, and lead adsorption behaviour was best modelled by the Freundlich isotherm. Adsorption situations fitted a pseudo second-order kinetic model. Intraparticular diffusion of heavy metal ions by oyster shell powder could be divided into two stages: rapid diffusion first, followed by a stable second stage. The maximum adsorption amount was ranked in an ascending order as that to copper, cadmium, and then lead for both single and competitive systems. The adsorption capacities of copper, cadmium, and lead ions by oyster shell powder were lower in a competitive system than in a single system, indicating that competitive adsorption could occur.