However, the degree of purification is critical for nanocellulose extraction, therefore, more free radicals in the H 2 O 2 solution need to be generated. Some studies extracted cellulose from agricultural waste such as rye straw (Sun et al. 2000 ) and rice straw (Sun et al. 2001 ) by using H 2 O 2 ; however, the process took more than 12 h.
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