Environmental catalysis and materials

Perchlorate removal using granular activated carbon supported ironcompounds: Synthesis, characterization and reactivity

Jianhong Xu , Naiyun Gao , Yulin Tang , Yang Deng , Minhao Sui


Received October 22, 2009,Revised January 08, 2010, Accepted , Available online

Volume 22,2010,Pages 1807-1813

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Synthesis and use of the iron compounds supported on granular activated carbon (ICs/GAC) have shown significant environmental implications for perchlorate (ClO4?) removal. ICs/GAC was synthesized via hydrolyzing FeSO4·7H2O on GAC, reduced by NaBH4 solution in polyethylene glycol 6000 and ethanol solution, dried in vacuum condition and exposed to air. Synthesized ICs/GAC was characterized using transmission electron micrograph (TEM), Brunauer-Emmett-Teller, X-ray photoelectron spectroscopy (XPS). ICs/GAC was determined to be containing a large amount of FeOHSO4, Fe2 O3 and a small amount of zero-valent iron (ZVI) nanoparticles according to TEM and XPS measurements. Batch static kinetic tests showed that 97% of ClO4? was removed within 10 hr at 90°C and 86% of ClO4? was removed within 12 hr at 25°C, at ICs/GAC dosage of 20 g/L. The experimental results also showed that FeOHSO4 and Fe2O3 nanoparticles have the function of perchlorate adsorption and play important roles in ClO4? removal. The activation energy (Ea) was determined to be 9.56 kJ/mol.

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