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本文利用直接制备的碳纳米管原始样品作为偶氮染料的吸附剂,采用次氯酸钠溶液对碳纳米管进行表面修饰改性,改性后显著提高了吸附剂的吸附容量,本工艺简单有效,所获得的吸附剂具有磁性,吸附过后用磁铁易于达到固液分离的效果。吸附性能结果表明,次氯酸钠改性后碳纳米管对水中甲基橙去除效果明显高于未改性的碳纳米管。吸附剂对水中甲基橙的吸附在70 min基本达到平衡,吸附过程符合准2级动力学模型(R2>0.99)。改性后的磁性碳纳米管吸附甲基橙的平衡吸附量qe与甲基橙溶液的平衡浓度ρe的关系满足Langmuir(R2>0.99),Freundlich(R2>0.98)以及Dubinin-Radushkevich(D-R)(R2>0.99)等温吸附模型。通过Langmuir模型计算可知改性磁性碳纳米管最大吸附容量为29.2 mg.g-1,吸附过程为有利吸附,由D-R模型计算结果可以推断,次氯酸钠改性后的磁性碳纳米管对水溶液中甲基橙的吸附以物理吸附为主。
In this paper, the direct preparation of carbon nanotubes as the original sample of azo dye adsorbent, the use of sodium hypochlorite solution on the surface modification of carbon nanotubes, modified significantly increased the adsorption capacity of the adsorbent, the process is simple and effective, obtained Of the adsorbent has a magnetic, easy to achieve with the magnet after adsorption effect of solid-liquid separation. Adsorption results show that sodium hypochlorite modified carbon nanotubes in water methyl orange removal was significantly higher than the unmodified carbon nanotubes. Adsorption of methyl orange in water reached equilibrium basically in 70 min, and the adsorption process accorded with quasi-second-order kinetic model (R2> 0.99). The relationship between the equilibrium adsorption amount qe of methyl orange and the equilibrium concentration ρe of methyl orange solution of modified magnetic carbon nanotubes satisfies Langmuir (R2> 0.99), Freundlich (R2> 0.98) and Dubinin-Radushkevich (DR) R2> 0.99) Isothermal adsorption model. The Langmuir model shows that the maximum adsorption capacity of modified magnetic carbon nanotubes is 29.2 mg.g-1, and the adsorption process is favorable adsorption. Judging from the DR model results, it can be inferred that sodium hypochlorite modified magnetic carbon nanotubes The adsorption of orange is mainly physical adsorption.