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Adsorption Studies for the Removal of Nitrate Using Modified Lignite Granular Activated Carbon

Title
Adsorption Studies for the Removal of Nitrate Using Modified Lignite Granular Activated Carbon
Author
전병훈
Keywords
adsorption; endothermic; lignite granular activated carbon; nitrate; physisorption
Issue Date
2011-07
Publisher
Taylor & Francis
Citation
Separation science and technology, 2012, 46(16), P.2575-2584
Abstract
The removal of nitrate (NO3-) on ZnCl2 modified lignite granular activated carbon (LGAC) was investigated. The LGAC was modified with varying chemical impregnation ratios (ZnCl2: LGAC) and activation temperatures. Modified LGAC (LGAC5), with a 2: 1 chemical impregnation ratio and a 500 degrees C activation temperature had the optimum adsorption capacity for NO3-, at a 200 mg/L initial concentration. The initial pH of the testing solutions significantly influenced the adsorption capacity of LGAC5. The contact time studies showed the effectiveness of LGAC5, up to 50 mg/L initial NO3- concentration with 30 min of equilibration time. Isotherm studies revealed the highest values of the Langmuir constant (b), confirming strong affinity of LGAC5 for NO3- ions. Thermodynamics studies verified the endothermic nature of the adsorption process with randomness at the solid/solution interface. Competitive ion testing demonstrated that interfering anions, such as Cl-, CO32-, and PO43-, significantly reduced NO3- adsorption on LGAC5.
URI
https://www.tandfonline.com/doi/abs/10.1080/01496395.2011.601782http://hdl.handle.net/20.500.11754/52864
ISSN
0149-6395
DOI
10.1080/01496395.2011.601782
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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