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[Arsenite removal performance by modified GAC].

Zhen-Zhong Liu1, Hui-Ping Deng, Jian Zhan

  • 1School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. liuzz79@126.com

Huan Jing Ke Xue= Huanjing Kexue
|May 13, 2009
PubMed
Summary
This summary is machine-generated.

Two novel iron-manganese oxide-impregnated granular activated carbons (FM-GAC-1 and FM-GAC-2) effectively remove arsenite. FM-GAC-1 demonstrated superior adsorption capacity and performance compared to FM-GAC-2.

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Area of Science:

  • Environmental Chemistry
  • Materials Science

Background:

  • Arsenite contamination poses a significant threat to water resources.
  • Granular activated carbon (GAC) is a promising adsorbent for water purification.
  • Developing efficient modified GAC materials is crucial for arsenite removal.

Purpose of the Study:

  • To synthesize and evaluate two types of iron-manganese oxide-impregnated GAC (FM-GAC-1, FM-GAC-2) for arsenite removal.
  • To investigate the adsorption characteristics, kinetics, and influencing factors of arsenite adsorption on FM-GACs.
  • To compare the arsenite removal performance of FM-GAC-1 and FM-GAC-2.

Main Methods:

  • Synthesis of two modified granular activated carbons (FM-GAC-1, FM-GAC-2) impregnated with Fe-Mn oxides.
  • Experimental investigation of arsenite adsorption using isotherm and kinetic studies.
  • Analysis of the influence of solution pH, temperature, and co-existing anions on arsenite adsorption.

Main Results:

  • Both FM-GAC-1 and FM-GAC-2 exhibited effective arsenite adsorption, with capacities of 32.37 mg/g and 26.67 mg/g, respectively.
  • Adsorption kinetics followed a pseudo-second-order rate equation, indicating chemical reaction as the rate-limiting step.
  • Lower pH and increasing temperature negatively impacted arsenite adsorption, suggesting exothermic and spontaneous processes.

Conclusions:

  • FM-GAC-1 and FM-GAC-2 are effective adsorbents for arsenite removal from aqueous solutions.
  • FM-GAC-1 shows superior performance over FM-GAC-2 in terms of adsorption capacity and efficiency.
  • Solution pH and temperature significantly influence arsenite adsorption, with implications for practical water treatment applications.