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CMC@PANI复合材料的仿生制备及其对水中染料的高效吸附

     

摘要

以羧甲基纤维素钠(CMC-Na)为原料,以氯化血红素(Hemin)为催化剂,利用仿生体系聚合苯胺,制备得到纤维素基聚苯胺(CMC@PANI)复合材料.考察了不同制备条件对CMC@PANI产品得率及甲基橙(MO)吸附去除率的影响,表征了吸附材料形貌等结构特征,并分析了复合材料对水中染料的吸附性能.结果表明:CMC@PANI的优化制备条件为25 ℃时,在200 mL pH值为4的柠檬酸-柠檬酸钠缓冲溶液中,CMC-Na质量浓度2.5 g/L,苯胺与CMC-Na质量比值为1.8,Hemin用量为0.10 g/L,H2O2 用量0.072 mol/L,HCl用量0.9 mol/L.此条件下,每克苯胺原料可得到约0.7 g CMC@PANI复合材料.扫描电镜、比表面积、红外光谱分析结果表明,该制备方法实现了CMC-Na和PANI的相互负载,产品粒径为0.5~10 μm,表面粗糙,BET比表面积为19.96 m2/g.最优工艺条件下制备的CMC@PANI对20 mg/L的阴离子染料MO在30 min时达到吸附平衡,去除率可达98%以上,最大吸附容量达到294.12 mg/g;对20 mg/L的阳离子染料罗丹明(RhB)在180 min时去除率可达89.8%,明显优于PANI的吸附效果(68.0%).可见,采用Hemin催化的绿色仿生工艺制备的CMC@PANI复合材料是一种比较理想的新型吸附材料.%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.

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