Membrane and Water Treatment

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KOH activated pine tree needle leaves biochar as effective sorbent for VOCs in water

  • Theoneste, Nshirirungu (Institute of Department of Environmental Engineering, Daegu University) ;
  • Kim, Moon Hyun (Institute of Department of Environmental Engineering, Daegu University) ;
  • Solis, Kurt Louis (Department of Environmental Systems Engineering, Korea University) ;
  • Park, Minoh (Department of Environmental Systems Engineering, Korea University) ;
  • Hong, Yongseok (Department of Environmental Systems Engineering, Korea University)
  • Received : 2017.12.18
  • Accepted : 2018.03.15
  • Published : 2018.09.25
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Abstract

The removal of volatile organic compounds (VOCs) from water using KOH-activated pine tree needle leaves biochar is considered a cost effective and efficient process. In this study, pine tree needle leaves were mixed with 0, 50, 100 and 200% (KOH weight/feedstock weight) of KOH, respectively. Then, the mixture was pyrolyzed at $500^{\circ}C$ for 6 hrs. The adsorption characteristics of 10 VOCs to the biochar were tested. The results indicated that the removal efficiency of the KOH activated biochar was highest in 100% KOH-biochar. The VOC removal efficiencies of 50% and 200% KOH activated biochar were similar and the 0% KOH activated biochar showed the lowest VOC removal. The FTIR results showed that increasing the amount of KOH seemed to enhance the formation of various functional groups, such as -OH, -C=C, -O. The adsorption strength of 10 VOCs to the KOH activated biochar seemed to be increasing by the increase of the solubility of VOCs. This may suggest that the adsorption is taking place in hydrophilic sites of the biochar surface. The KOH activated pine tree needle leaves biochar can be an effective sorbent for VOCs removal in water and 100% KOH mixing seemed to provide better sorption capacity.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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