CMC@PANI复合材料的仿生制备及其对水中染料的高效吸附  

Biomimetic Synthesis of CMC@PANI and Its High Efficient Adsorption of Dyes in Aqueous

作　　者：张青[1] 宋冰清 孟令易 严梅[1] 谢慧芳[1] 孔金明[1] 

机构地区：[1]南京理工大学环境与生物工程学院,江苏南京210094

出　　处：《林产化学与工业》2017年第2期85-92,共8页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金资助项目(21575066)

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 m L 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,H_2O_2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0.5~10μm,表面粗糙,BET比表面积为19.96 m^2/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(Rh B)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. t g/L, H202 dosage of 0.07 mol/L, HC1 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 heroin was an ideal alternative adsorbent with high adsorption capacity for dyes in aqueous.

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 

分 类 号：TQ35[化学工程]