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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 905Enhanced Cr(VI) Removal from Landfill Leachates...

Enhanced Cr(VI) Removal from Landfill Leachates Using Nanoscale Zero-Valent Iron

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Abstract:

Nanoscale zero-valent iron modified by citric acid (m-NZVI) was used to remove hexavalent chromium (Cr (VI)) from landfill leachates. Citric acid was useful to enhance the dispersion of NZVI. The results demonstrated that the m-NZVI particles were uniform with a mean diameter of 45.6 nm and the specific surface area was about 22.8 m²/g. The Cr (VI) removal rates increased as an increase of the dosage of m-NZVI and the temperature but decreased as an increase of pH and the initial concentration of HA. Cr (VI) adsorption kinetics followed a pseudo-first-order rate expression and the reaction rate constants ranged from 0.05 to 0.32 min^-1. X-ray photoelectron spectroscope (XPS) analysis confirmed that the Fe (III)-critic acid and/or Cr (III)-HA compounds were formed on the m-NZVI surface, which could hinder the formation of Fe (III)-Cr (III) compounds. It was also shown that removing Cr (VI) by m-NZVI was a chemical controlled and irreversible process.

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Advances in Applied Materials and Electronics Engineering III

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Periodical:

Advanced Materials Research (Volume 905)

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12-18

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.905.12

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Online since:

April 2014

Authors:

Ting Yi Liu*, Zhong Liang Wang, Xiao Xing Yan

Keywords:

Critic Acid, Hexavalent Chromium, Humic Acid (HA), Landfill Leachates, Nanoscale Zero-Valent Iron (NZVI)

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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