浮石负载壳聚糖吸附去除水中丙溴磷
发布时间：2018-10-08 06:16
【摘要】：通过浮石负载壳聚糖制备了吸附剂壳聚糖/浮石复合物,采用扫描电子显微镜(SEM)、热重分析(TGA)、元素分析、傅里叶红外光谱(FT-IR)、X射线衍射(XRD)和X射线荧光光谱(XRF)等技术手段表征了吸附剂性质,考察了吸附剂量、吸附时间、溶液pH值、离子强度和温度对该吸附剂吸附去除水中丙溴磷的影响,研究了再生吸附剂的吸附性能。结果表明,负载在浮石上的壳聚糖占吸附剂总量的8.69%;在p H值3.0~7.0内,壳聚糖/浮石对丙溴磷的吸附率大于90%;这种吸附剂对丙溴磷的吸附受溶液离子强度影响较小,随温度升高而稍微减小。在溶液温度25℃、pH=7.0、丙溴磷浓度40 mg/L、壳聚糖/浮石剂量为0.7 g/L和吸附平衡时间为90 min条件下,此吸附剂对丙溴磷最大吸附率为93.3%(最大吸附量为53.4 mg/g)。壳聚糖/浮石连续经过3次吸附/再生循环,每次循环对丙溴磷的吸附率下降约12%。可见壳聚糖/浮石通过吸附可有效地去除水中的农药丙溴磷。
[Abstract]:The adsorbent chitosan / pumice complex was prepared by using pumice loaded chitosan. Scanning electron microscopy (SEM) (SEM), thermogravimetric analysis (TGA) was used to analyze (TGA), elements. Fourier transform infrared spectroscopy (FT-IR) X-ray diffraction (XRD) and X-ray fluorescence spectroscopy (XRF) were used to characterize the properties of the adsorbent. The amount of adsorbent, the adsorption time and the pH value of the solution were investigated. The effect of ion strength and temperature on the adsorption and removal of propyl phosphate in water was studied. The adsorption properties of regenerated adsorbent were studied. The results showed that chitosan loaded on pumice accounted for 8.69% of the total adsorbent, and the adsorption rate of propyl bromide on chitosan / pumice was more than 90% within pH value 3.0 ~ 7.0, and the adsorption of propyl bromide by this adsorbent was less affected by the ionic strength of solution. It decreases slightly with the increase of temperature. Under the conditions of pH = 7.0 at 25 鈩，
本文编号：2255732
[Abstract]:The adsorbent chitosan / pumice complex was prepared by using pumice loaded chitosan. Scanning electron microscopy (SEM) (SEM), thermogravimetric analysis (TGA) was used to analyze (TGA), elements. Fourier transform infrared spectroscopy (FT-IR) X-ray diffraction (XRD) and X-ray fluorescence spectroscopy (XRF) were used to characterize the properties of the adsorbent. The amount of adsorbent, the adsorption time and the pH value of the solution were investigated. The effect of ion strength and temperature on the adsorption and removal of propyl phosphate in water was studied. The adsorption properties of regenerated adsorbent were studied. The results showed that chitosan loaded on pumice accounted for 8.69% of the total adsorbent, and the adsorption rate of propyl bromide on chitosan / pumice was more than 90% within pH value 3.0 ~ 7.0, and the adsorption of propyl bromide by this adsorbent was less affected by the ionic strength of solution. It decreases slightly with the increase of temperature. Under the conditions of pH = 7.0 at 25 鈩，
本文编号：2255732
本文链接：https://www.wllwen.com/kejilunwen/nykj/2255732.html
