Perchlorate adsorption and desorption on activated carbon and anion exchange resin.
The mechanisms of perchlorate adsorption on activated carbon (AC) and anion exchange resin (SR-7 resin) were investigated using Raman, FTIR, and zeta potential analyses. Batch adsorption and desorption results demonstrated that the adsorption of perchlorate by AC and SR-7 resin was reversible. The reversibility of perchlorate adsorption by the resin was also proved by column regeneration test. Solution pH significantly affected perchlorate adsorption and the zeta potential of AC, while it did not influence perchlorate adsorption and the zeta potential of resin. Zeta potential measurements showed that perchlorate was adsorbed on the negatively charged AC surface. Raman spectra indicated the adsorption resulted in an obvious position shift of the perchlorate peak, suggesting that perchlorate was associated with functional groups on AC at neutral pH through interactions stronger than electrostatic interaction. The adsorbed perchlorate on the resin exhibited a Raman peak at similar position as the aqueous perchlorate, indicating that perchlorate was adsorbed on the resin through electrostatic attraction between the anion and positively charged surface sites.
Yoon
In-Ho
IH
Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea.
Meng
Xiaoguang
X
Wang
Chao
C
Kim
Kyoung-Woong
KW
Bang
Sunbaek
S
Choe
Eunyoung
E
Lippincott
Lee
L
D000327:Adsorption; D000837:Anion Exchange Resins / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010472:Perchlorates / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D055672:Static Electricity; D013499:Surface Properties; D018508:Water Purification / Q000379:methods
D000837:Anion Exchange Resins; D010472:Perchlorates; D002244:Carbon; C494474:perchlorate