A recyclable method for preparation of Hydrochars and silica from rice husk - Details

Author：

Ma, Xiao Yu (Ma, Xiao Yu.) | Wang, Li Li (Wang, Li Li.) | Cui, Su Ping (Cui, Su Ping.) (Scholars：崔素萍) | Wang, Ya Li (Wang, Ya Li.)

Indexed by：

EI Scopus

Abstract：

In　the　present　work,　a　green　and　sustainable　route　for　preparation　of　hydrochars　and　silica　from　a　bio-resource　(rice　husk)　under　low　temperature　and　atmospheric　pressure　was　described.　This　route　was　achieved　with　the　catalysis　of　sulfuric　acid　and　NH4F.　The　sphere-like　carbon　materials　with　regular　size　of　about　500nm　were　obtained　at　95°C　for　6　h　when　the　acid　concentration　was　42%　and　52%.　The　obtained　yield　of　silica　reached　up　to　94.6%　and　the　particle　size　was　50-60nm.　The　morphology　of　the　hydrochars　was　controllable　by　changing　the　concentration　of　sulfuric　acid.　Microstructure　of　the　precipitated　silica　powder　was　carried　out　using　transmission　electron　microscopy　(TEM).　The　preparation　conditions　were　determined　and　the　recyclability　of　the　process　was　confirmed　experimentally.　All　the　reactants　and　byproducts　were　recyclable　in　this　process,　without　the　waste　emissions.　©　(2014)　Trans　Tech　Publications,　Switzerland.

Keyword：

Functional materials High resolution transmission electron microscopy Atmospheric pressure Biomass Silica Morphology Particle size Temperature Sulfuric acid

Author Community：

[ 1 ] [Ma, Xiao Yu]College of Materials Science and Engineering, Beijing University of Technology, Beijing, China
[ 2 ] [Wang, Li Li]College of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin, China
[ 3 ] [Cui, Su Ping]College of Materials Science and Engineering, Beijing University of Technology, Beijing, China
[ 4 ] [Wang, Ya Li]College of Materials Science and Engineering, Beijing University of Technology, Beijing, China