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以棉花作为生物模板制备出具有棉花形貌的纳米羟基磷灰石(HAP),并将其运用于水体中三氯生的吸附去除研究。采用X射线粉末衍射仪、傅里叶红外、扫描电镜、透射电镜表征了吸附前后HAP的物相组成、官能团、形貌和颗粒尺寸变化。考察了初始pH、时间和温度对HAP吸附三氯生的影响。动力学数据符合准二级动力学模型,颗粒内扩散不是唯一的限速步骤;平衡吸附数据符合Langmuir等温吸附模型;热力学参数吉布斯自由能(ΔG0)、焓变(ΔH0)、熵变(ΔS0)值揭示三氯生吸附至HAP上是一个自发吸热的过程。对比其他吸附剂,HAP具有高吸附量且环境友好的优势。
Using cotton as a biological template, nano-hydroxyapatite (HAP) with cotton morphology was prepared and applied to the adsorption and removal of triclosan in water. The phase composition, functional groups, morphology and particle size of HAP before and after adsorption were characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and transmission electron microscopy. The effects of initial pH, time and temperature on HAP adsorption on triclosan were investigated. The kinetic data are in accordance with the quasi-second-order kinetic model. The intraparticle diffusion is not the only rate-limiting step. The equilibrium adsorption data fit the Langmuir isothermal adsorption model. The thermodynamic parameters Gibbs free energy (ΔG0), enthalpy change (ΔH0) ΔS0) revealed that triclosan is a spontaneous endothermic process. HAP has the advantage of being highly adsorptive and environmentally friendly compared to other adsorbents.