Avicel PH101 (~ 50 μm particle size), which is microcrystalline cellulose, was purchased from Sigma Aldrich (Shanghai, China). Cellulase (Novozymes Cellic CTec2) was purchased from Sigma Aldrich (Shanghai, China). Sulfuric acid (H2SO4) AR grade was purchased from Sinopharm Group (Shanghai, China). All chemicals were used as received.
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