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Volume 16, No. 12, December 2016, Pages 3281-3289 PDF(1.18 MB)  
doi: 10.4209/aaqr.2016.08.0353   

Experimental Study on PCDD/Fs Adsorption onto Nano-Graphite

Wenwei Li, Xiaoqing Lin, Mingfeng Yu, Ishrat Mubeen, Alfons Buekens, Xiaodong Li

State Key Laboratory of Clean Energy Utilisation, Zhejiang University, Hangzhou 310027, China

 

Highlights
  • Nano-graphite was applied to adsorb PCDD/Fs.
  • Removal efficiencies of PCDD/Fs strongly correlate with PCDD/Fs vapour pressure.
  • π-π interactions between PCDD/Fs and graphite sheets are important for adsorption.
  • Mespores volume of graphite is a critical factor to adsorb PCDD/Fs.

Abstract

 

The adsorption of the 17 toxic 2,3,7,8-substituted dioxin congeners onto graphite was investigated using a laboratory-scale fixed-bed adsorption system. First, the morphology and microstructure of graphite were characterized by Scanning Electron Microscopy and Brunauer-Emmer-Teller surface estimation. Removal efficiency of the 17 toxic PCDD/Fs varies from 89.31% to 99.96% and the amount adsorbed on graphite is a linear function of the inlet concentration of PCDD/Fs, as it was varied from 2.3–20.7 ng I-TEQ Nm–3. Operating over 3 hours, it is observed that the saturation time of fixed-bed adsorbers is less when the inlet concentration is higher. The removal efficiency of dioxin depends on vapour pressure and rises strongly with increasing chlorine substitution number. Removal efficiencies strongly correlate with vapour pressure, with R2 0.96 for PCDDs and 0.99 for PCDFs, respectively. The removal efficiency of dioxin decreases linearly as the temperature increased (R2 = 0.99). Possibly, π-π interactions between PCDD/Fs and graphite sheets lead to a high adsorption capacity of dioxin. The high mesopores volume and pore structure of graphite are critical factors when adsorbing dioxin.

 

 

Keywords: PCDD/Fs; Graphite; Adsorption; Removal efficiency.

 

 

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