多孔NiO的制备及其对水中四环素的吸附

Preparation of Porous NiO and Its Adsorption for Tetracycline in Water

采用水热法及高温灼烧合成了多孔金属氧化物NiO,并用于水样中四环素(TC)的吸附。使用扫描电镜(SEM)、傅立叶变换红外光谱(FTIR)以及X-射线衍射(XRD)方法进行表征。结果表明,产物呈现团簇的花朵状结构,表面多孔。考察了pH值、吸附时间、TC浓度及温度对NiO吸附能力的影响。得到NiO吸附TC的最佳pH值为7.0,吸附120 min即可达到吸附平衡,当TC浓度由10 mg/L增加到100 mg/L时,吸附量由26.49 mg/g增加到134.84 mg/g。吸附过程符合准二级动力学模型,通过Langmuir模型拟合得出NiO对TC的最大吸附容量为144.90 mg/g。NiO具有可重复使用、成本低廉、制备方法简单,对TC吸附容量高等优点,适用于污染水体中TC类污染物的快速去除。

A porous metal oxide NiO used to adsorb tetracycline(TC) in water samples was synthesized by hydrothermal method and subsequent high-temperature calcination.The obtained nanomaterial was characterized by scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR) and X-ray diffraction(XRD).Results showed that NiO exhibited a clustered flower-like porous structure.Effects of pH value,adsorption time,TC concentration and temperature on the adsorption performance of NiO were investigated.The optimal pH value for TC adsorption on NiO was 7.0,and an adsorption equilibrium could be reached in 120 min.The adsorption capacity increased from 26.49 mg/g to 134.84 mg/g when TC concentration varied from 10 mg/L to 100 mg/L.The adsorption process fit well with the pseudo-second-order kinetic model.The maximum adsorption capacity of NiO for TC was calculated to be 144.90 mg/g by fitting the adsorption date with the Langmuir model.Therefore,with the advantages of reusability,low cost,simple preparation and high adsorption capacity for TC etc.,NiO has a great potentiality in the rapid removal of TC pollutants in polluted water samples.