Optimization of ethanol-extracted lignin from palm fiber by response surface methodology and preparation of activated carbon fiber for dehumidification.

2 , when the reaction time was between 60 and 120 min, the lignin yield exhibited an increasing trend.

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For p -value > 0.05, the effect is not significant; for p -value between 0.01–0.05, the effect is significant; and for p -value < 0.01, the effect is highly significant.

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