Wood gasification produces gasification char(GC),a carbonaceous by-product with limited sustainable valor-isation strategies.The physical activation of wood-based GC as a precursor has received insufficient attention,...Wood gasification produces gasification char(GC),a carbonaceous by-product with limited sustainable valor-isation strategies.The physical activation of wood-based GC as a precursor has received insufficient attention,likely due to the inherent challenges associated with the precursor,namely its soft skeleton,high degree of graphitisation,ash content,and reduced porosity.This study investigates methods to enhance the porosity and adsorption properties of renewable activated carbon(AC)derived from GC while maximising yield using a Design of Experiments approach.Yield-oriented porosity optimisation revealed that mild H_(2)O activation(⩽750℃,≥20 min)was the most effective,followed by CO_(2)activation at 817℃ and 16.2 min.The AC with the highest overall porosity was produced by sequential activation,leveraging the high surface area obtained from H_(2)O activation(812 m^(2)/g)and the high micropore fraction from CO_(2)activation(49.3 vol%).In micropollutant adsorption assays,this AC(maximum adsorption capacity qmax for metoprolol:89.9 mg/g)partially out-performed commercial AC(89.1 mg/g).We found that the utilisation of GC for AC production represents a fundamentally distinct starting point when compared to previously employed precursors,as evidenced by significantly reduced activation times and temperatures.This study provides valuable insights for the efficient conversion of GC into high-value AC,a pathway of significant interest for industrial applications.展开更多
The authors regret that there was a mix-up in the illustrations during the approval process.Here is the correct image for Fig.4:The authors would like to apologise for any inconvenience caused.
基金The financial support by the Austrian Federal Ministry of Labour and Economythe National Foundation for Research,Technology and Developmentthe Christian Doppler Research Association is grate-fully acknowledged.
文摘Wood gasification produces gasification char(GC),a carbonaceous by-product with limited sustainable valor-isation strategies.The physical activation of wood-based GC as a precursor has received insufficient attention,likely due to the inherent challenges associated with the precursor,namely its soft skeleton,high degree of graphitisation,ash content,and reduced porosity.This study investigates methods to enhance the porosity and adsorption properties of renewable activated carbon(AC)derived from GC while maximising yield using a Design of Experiments approach.Yield-oriented porosity optimisation revealed that mild H_(2)O activation(⩽750℃,≥20 min)was the most effective,followed by CO_(2)activation at 817℃ and 16.2 min.The AC with the highest overall porosity was produced by sequential activation,leveraging the high surface area obtained from H_(2)O activation(812 m^(2)/g)and the high micropore fraction from CO_(2)activation(49.3 vol%).In micropollutant adsorption assays,this AC(maximum adsorption capacity qmax for metoprolol:89.9 mg/g)partially out-performed commercial AC(89.1 mg/g).We found that the utilisation of GC for AC production represents a fundamentally distinct starting point when compared to previously employed precursors,as evidenced by significantly reduced activation times and temperatures.This study provides valuable insights for the efficient conversion of GC into high-value AC,a pathway of significant interest for industrial applications.
文摘The authors regret that there was a mix-up in the illustrations during the approval process.Here is the correct image for Fig.4:The authors would like to apologise for any inconvenience caused.
