CMC@PANI复合材料的仿生制备及其对水中染料的高效吸附

doi:10.3969/j.issn.0253-2417.2017.02.011

摘要/Abstract

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。

关键词: 羧甲基纤维素钠, 氯化血红素, 聚苯胺, CMC@PANI复合材料, 吸附

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

中图分类号:

TQ35

张青, 宋冰清, 孟令易, 严梅, 谢慧芳, 孔金明. CMC@PANI复合材料的仿生制备及其对水中染料的高效吸附[J]. 林产化学与工业, 2017, 37(2): 85-92.

ZHANG Qing, SONG Bingqing, MENG Lingyi, YAN Mei, XIE Huifang, KONG Jinming. Biomimetic Synthesis of CMC@PANI and Its High Efficient Adsorption of Dyes in Aqueous[J]. Chemistry and Industry of Forest Products, 2017, 37(2): 85-92.

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