Preparation of CuO-humic acid composite and its adsorption properties

doi:10.16085/j.issn.1000-6613.2018-0092

Abstract

Abstract: 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.

Key words: CuO/HA composite, adsorption, thermodynamics, kinetics, methylene blue

摘要： 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。

关键词: CuO/腐殖酸复合材料, 吸附, 热力学, 动力学, 亚甲基蓝

CLC Number:

TB331

LIU Zhixiong, ZHANG Jiali, HONG Xuyan, TIAN Guiying, TANG Zhihao, HU Mingyu. Preparation of CuO-humic acid composite and its adsorption properties[J]. Chemical Industry and Engineering Progress, 2018, 37(10): 4060-4067.

刘志雄, 张佳丽, 洪许言, 田桂英, 汤志豪, 胡明宇. CuO/腐植酸复合材料的制备及其吸附性能[J]. 化工进展, 2018, 37(10): 4060-4067.

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