A new route for preparation of hydrochars from rice husk

Reduction in time required for synthesis of high specific surface area silica from pyrolyzed rice husk by precipitation at low pH

“…The annual worldwide output has been estimated to be 80 million tons, of which 40 million tons are generated in China (Wang et al, 2010). There is a need to convert at least some of this residue into higher value products.…”

Application studies of activated carbon derived from rice husks produced by chemical-thermal process—A review

“…In our recently studies, a carbon-rich solid product denoted as hydrochars was selected as a new carbon precursor, which was prepared from sulfuric acid hydrolysis solution of RH via dehydration and carbonization [43]. Combined with the characteristics of phosphoric acid activation, we prepared high surface area porous carbon using hydrochars as precursor.…”

Nanoporous Carbon Synthesis: An Old Story with Exciting New Chapters

“…In fact, AMC is able to maximize the availability of cellulose and hemicellulose in carbon precursors with high inorganic content (e.g. rice husk) [87,88] and is also efficient for producing carbonrich materials from liquid carbon precursors, as is the case of glycerol [89]. Depending on the acid catalyst used (e.g.…”

“…In 2010, the authors reported the effect of H 2 SO 4 concentration during carbonization step, as well as the reaction temperature and time onto the yield of the obtained acidchar that attained 32% (wt.) for the reaction at 95°C during 10 h when 72% H 2 SO 4 solution was used in both hydrolysis and carbonization [88]. Regarding the effect of the H 2 SO 4 concentration (42-72%) during acid carbonization onto the textural properties of the activated carbon obtained by H 3 PO 4 activation, the authors concluded that although acidchars prepared under distinct acid concentrations present similar elemental analysis, the BET area and pore volumes increase as the concentration of the H 2 SO 4 decreases [87].…”

“…These materials were activated with H 3 PO 4 [87,88] and KOH [88] to produce nanoporous carbons with BET areas higher than 2400 m 2 g…”