Abstract:

The surface of quartz sand was modified by a dry method using Titanate coupling agent DN101 to improve the hydrophobic property of oil filter. The effects of reaction time, dosage of Titanate coupling agent DN101 and reaction temperature on the performance of the oil filter were studied by single factor experiment. The results show that the quartz sand modified by dry process using DN101 exhibits the best performance when the reaction time is 70 min, DN101 dosage 1.2% and reaction temperature 60℃. Lipophilic-Hydrophilic Ratio (LHR) increases from 1.25 to 11.1, the adsorption capacity has great improvement from 0.17 mg·g^-1 to 0.25 mg·g^-1 for 15.61 mg·L^-1 oily wastewater and the oil removal rate of the modified quartz sand filter improves from 72.6% to 97.8% for 17.3 mg·L^-1 oily wastewater. The analysis by SEM, XPS and FTIR shows that the chemical bonding combination of DN101 with the functional groups on quartz sand surface forms a uniform and stable cladding layer on the surface of quartz sand.

Key words: quartz sand, interfacial tension, dry process modification, filtration, petroleum, wastewater, hydrophobic

摘要：

采用钛酸酯偶联剂DN101对石英砂滤料进行表面干法改性,增强滤料的亲油疏水性。通过单因素实验研究改性时间、DN101浓度以及改性温度对改性效果的影响,并以亲油亲水比LHR作为评判改性效果的标准。结果表明,反应时间为70 min、DN101用量为1.2%、反应温度为60℃时,DN101干法改性石英砂效果最好,LHR值由未改性时的1.25提高到最大值11.1;改性石英砂对15.61 mg·L^-1含油废水的吸附容量由未改性时的0.17 mg·g^-1增大到0.25 mg·g^-1;对17.3 mg·L^-1含油废水的过滤去除率由未改性时的72.6%提高到97.8%。扫描电镜、电子能谱和红外光谱分析结果表明,DN101以化学键的方式与石英砂表面官能团结合,对石英砂形成了均匀稳定的包覆层。

关键词: 石英砂, 界面张力, 干法改性, 过滤, 石油, 废水, 疏水性