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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