有机-无机-磁性树脂对微污染水源水中腐殖酸的吸附性能研究

Adsorption Property of Humic Acid in Micro-polluted Water by Organic-Inorganic-Magnetic Resin

以有机化磁性凹凸棒土(M-ATP)制备有机-无机-磁性三效性能树脂(MPR)。利用扫描电镜、傅里叶变换红外光谱等对树脂形貌和结构进行表征,考察了树脂对腐殖酸(HA)的吸附性能。结果表明,超声分散法制备的样品(UD-MPR)溶胀态下有效比表面积为674.31 m^2/g,M-ATP的最佳添加量为8%(m/m)。UD-MPR对HA的吸附符合二级动力学模型,平衡时间为233 min。当HA初始浓度为14.87 mg/L时,吸附量达13 mg/g。对Langmuir及Freundlich等温吸附模型拟合度均较高。热力学参数(ΔH~θ,ΔS~θ,ΔG~θ)测定结果表明,UD-MPR吸附HA是自发吸热的反应,乙酸对吸附过程影响较大。吸附剂可循环使用,重复使用6次,吸附性能没有明显变化。

Nanocomposites of magnetic attapulgite-resin(MPR)were prepared for adsorption of humic acid(HA).This nano adsorbent was characterized by X-ray diffractometer(XRD),Fourier Transform Infrared(FTIR)spectroscopy and Scanning Electron Microscope(SEM).The adsorption property of HA onto MPR was investigated.Experimental results indicated that MPR prepared by the ultrasonic dispersion exhibited a much better adsorption capacity than that of the resin and attapulgite.The effective specific surface area of the MPR was illustrated to be 674.31 m 2/g.With a initial concentration of HA of 14.87 mg/L,the adsorption capacity reached 13 mg/g.Besides,it was found that the adsorption capacity increased with the contact time,and it reached the equilibrium at 233 min.The adsorption kinetics and isotherms could be well described by pseudo-second-order model and Langmuir isotherm model,respectively.Thermodynamic parameters(ΔHθ,ΔSθ,andΔGθ)indicated that the adsorption was spontaneous and exothermic.Acetic acid had obvious influence on the adsorption of HA on this complex resin.The adsorbent could be reused six times without obvious decrease of adsorption performance.