Adsorption properties of heavy metal ions in landfill leachate by Na-bentonite SCIE SCOPUS

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Title
Adsorption properties of heavy metal ions in landfill leachate by Na-bentonite
Author(s)
Xu, Xin; Liu, Xiaofeng; Oh, Myounghak; Park, Junboum; Chen, Y. Frank
KIOST Author(s)
Oh, Myoung Hak(오명학)
Publication Year
2019-01
Abstract
As a result of the rapid development of industry, the heavy metal contamination of landfill leachate has become more serious. Adsorption is an effective method that can remove heavy metal ions from landfill leachate. Na-bentonite was selected as the adsorbent for the adsorption of heavy metal ions (lead, cadmium, copper) from landfill leachate in both single and competitive systems. Batch experiments were conducted to study the effects of contact time, pH value, temperature, and initial concentration on adsorption efficiency. Adsorption behavior was investigated by means of adsorption isotherms, adsorption kinetics, and adsorption thermodynamics. The study results show that: 1. The amount of heavy metal ions adsorbed by Na-bentonite increases with increasing contact time, pH value, temperature, and initial concentration of heavy metal ions. 2. Adsorption behavior is suitable for modeling with the Langmuir isotherm and a pseudo second-order kinetic model. 3. The adsorption of lead and cadmium are thermodynamically spontaneous, the adsorption of copper is not spontaneous, and the adsorption processes of lead, cadmium and copper are all endothermic using thermodynamic analysis. 4. Competitive adsorption between lead, cadmium, and copper occurs in competitive systems.
ISSN
0025-5300
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/711
DOI
10.3139/120.111284
Bibliographic Citation
MATERIALS TESTING, v.61, no.1, pp.81 - 87, 2019
Publisher
CARL HANSER VERLAG
Subject
COAL FLY-ASH; WASTE-WATER; AQUEOUS-SOLUTION; REMOVAL; BEHAVIOR; SORPTION; MODELS; CU2+; NI2+; ZN2+
Keywords
Na-bentonite; heavy metal ions; landfill leachate; adsorption kinetics; adsorption thermodynamics
Type
Article
Language
English
Document Type
Article
Publisher
CARL HANSER VERLAG
Related Researcher
Research Interests

Marine geotechnics,Geoenvironmental Engineering,offshore foundation,해양지반공학,지반환경공학,해양구조물 기초

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