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Preparation of Biomass-based Mesoporous Carbon with Higher Nitrogen-/Oxygen-chelating Adsorption for Cu(II) Through Microwave Pre-Pyrolysis
Published on: February 12, 2019
[Bromate reduction by granular activated carbon].
Xin Huang1, Nai-yun Gao, Pin-pin Lu
1State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China.
Huan Jing Ke Xue= Huanjing Kexue
|February 14, 2008
Summary
Granular activated carbon effectively removes bromate, with optimal performance at low pH and ionic strength. Bromate reduction kinetics are influenced by surface functional groups and competing anions, following pseudo-second order and intraparticle diffusion models.
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
Context:
- Bromate is a potential carcinogen found in drinking water.
- Granular activated carbon (GAC) is a common adsorbent for water purification.
Purpose:
- To investigate the kinetics of bromate reduction to bromide by GAC.
- To determine the influence of solution conditions (pH, ionic strength, temperature, anions) on GAC performance.
Summary:
- GAC's bromate removal capacity correlates with surface basic functional groups.
- Bromate reduction follows pseudo-second order kinetics, while bromide formation follows intraparticle diffusion.
- Inhibition by anions followed the sequence NO3(-) > SO4(2-) > Cl(-).
- Optimal conditions for bromate removal include low pH and low ionic strength.
- Maximum adsorption capacity reached 769.23 micromol/g, but the process is slow and sensitive to bromide release from micropores.
Impact:
- Provides insights into optimizing GAC for bromate removal in water treatment.
- Identifies key factors affecting bromate reduction efficiency.
- Contributes to understanding the mechanisms of GAC adsorption and contaminant transformation.
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