CuO/腐植酸复合材料的制备及其吸附性能

Preparation of CuO-humic acid composite and its adsorption properties

采用水热法合成了CuO-腐植酸(HA)纳米复合材料,研究了其对亚甲基蓝的初始吸附性能及再生吸附性能。运用扫描电镜/能谱仪(SEM/EDS)、傅里叶变换红外光谱仪(FTIR)、X射线粉末衍射仪(XRD)、激光粒度分析仪和比表面积测定仪(BET)对其结构进行了表征。研究了pH、亚甲基蓝初始浓度和反应温度等因素对CuO/HA吸附亚甲基蓝的影响,采用多种模型研究了CuO/HA复合材料对亚甲基蓝的吸附动力学和热力学行为。结果表明:合成的CuO/HA平均粒径约为135.0nm,比表面积为188.15m2/g。CuO/HA对亚甲基蓝(MB)的吸附动力学行为符合拟一级动力学模型,在60min内达到吸附平衡,较好地符合Frendlich吸附模型。在室温下pH=7时,CuO/HA复合材料初始饱和吸附量达172.01mg/g;循环使用8次,可保持初始吸附能力的89.27%,表明有较好的吸附性能,可作为一种有效除去水体中亚甲基蓝污染物的高容量吸附材料。

CuO/HA nanometer composite prepared by hydrothermal method and its initial adsorption and regenerative adsorption property for methylene blue(MB)were investigated.The CuO/HA composite were characterized by scanning electron microscopy/energy disperse spectroscopy(SEM/EDS),Fourier transform infrared(FTIR),X-ray diffraction(XRD),laser granularity analyzer and BET analysis.The effects of these factors including pH,initial concentration of MB and temperature on the adsorption of CuO/HA composite for MB were studied.All kinds of models were used to study adsorption kinetics and thermodynamics behavior for the adsorption of MB on the CuO/HA composite.The results showed that the average size of CuO/HA composite synthesized is 135.0nm and its specific area is 188.15m2/g.The adsorption for Methylene Blue(MB)is a pseudo first-rate kinetic process and reaches equilibrium in 60min,which was in a good agreement with the Freundlich adsorption model.The maximum initial adsorption capacity reached 172.01mg/g at room temperature and pH=7.Regenerative adsorption capacity was 89.27%initial adsorption capacity after being reused 8 times.Therefore,CuO/HA composite could be used as an adsorption material with high capacity for effective removal of methylene blue from wastewater.