Abstract: Cellulose-based polyaniline(CMC@PANI) absorbent was synthesized biomimetically by using sodium carboxymethyl cellulose (CMC-Na) as the raw material. And aniline was polymerized from CMC-Na in the presence of hemin used as the catalyst. The main factors in preparation were optimized based on the yield of CMC@PANI and its capacity of the removal of methyl orange (MO) in aqueous. And the preparation conditions were chosen as pH value of 4, CMC-Na mass concentration of 2.5 g/L, mass ratio of aniline to CMC-Na of 1.8, hemin dosage of 0.1 g/L, H₂O₂ dosage of 0.07 mol/L, HCl dosage in acid doping of 0.9 mol/L and reaction temperature of 25 ℃. The yield of as-prepared CMC@PANI was about 0.7 g/g aniline. The results that obtained from SEM, BET, BJH and FT-IR characterization, indicated that the mutual load of CMC-Na and PANI was successful and the adsorbent was particle with diameter of 0.5-10 μm and rough surface. The BET specific surface area was 19.96 m²/g. For 20 mg/L solution of anionic dye, MO, CMC@PANI could absorb over 98% within 30 min and the adsorption capacity could be reached 294.12 mg/g. At the same time, CMC@PANI showed nice adsorption for cationic dye Rhodamine B (RhB) and the removal ratio could be reached 89.8% in 20 mg/L RhB aqueous within 180min. The CMC@PANI that synthesized through the green biomimetic process catalyzed by hemin was an ideal alternative adsorbent with high adsorption capacity for dyes in aqueous.

Key words: sodium carboxymethyl cellulose, hemin, polyaniline, CMC@PANI, adsorption