Adsorption Studies for the Removal of Nitrate Using Modified Lignite Granular Activated Carbon
- Authors
- Khan, Moonis Ali; Ahn, Yong-Tae; Kumar, Mahendra; Lee, Wontae; Min, Booki; Kim, Gyoobum; Cho, Dong-Wan; Park, Won Bae; Jeon, Byong-Hun
- Issue Date
- 2011
- Publisher
- TAYLOR & FRANCIS INC
- Keywords
- adsorption; endothermic; lignite granular activated carbon; nitrate; physisorption
- Citation
- SEPARATION SCIENCE AND TECHNOLOGY, v.46, no.16, pp.2575 - 2584
- Journal Title
- SEPARATION SCIENCE AND TECHNOLOGY
- Volume
- 46
- Number
- 16
- Start Page
- 2575
- End Page
- 2584
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/2760
- DOI
- 10.1080/01496395.2011.601782
- ISSN
- 0149-6395
- 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.
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