ZnCl2预处理改善超疏水滤纸性能的研究

Study on Improving the Performance of Superhydrophobic Filter Paper by ZnCl2 Pretreatment

关键词:  滤纸  超疏水  ZnCl₂预处理  纳米二氧化硅

Key Words:filter paper  superhydrophobic  ZnCl₂ pretreatment  nano silica

摘要:以滤纸为基材，通过ZnCl₂预处理和表面修饰法制备超疏水滤纸，探讨了ZnCl₂预处理对超疏水滤纸的疏水性、稳定性、油水分离效率等的影响。结果表明，ZnCl₂预处理使纤维素部分结晶区被打开，暴露出更多羟基，改善了滤纸的接触角和滚动角，最佳值分别达154.8°和6°；当纸张在中等酸碱性溶液（pH值4~10）中时，经过预处理的超疏水滤纸接触角保持在150°以上，表明ZnCl₂预处理提高了滤纸的化学稳定性和热稳定性。该超疏水滤纸对三氯甲烷分离30次后，其分离效率保持在95%以上。

Abstract:The superhydrophobic filter paper was prepared by ZnCl₂ pretreatment and surface modification using filter paper as substrate. The effects of ZnCl₂ pretreatment on hydrophobicity， stability and separation efficiency towards oil and water of hydrophobic filter paper were discussed. The results showed that the pretreatment could open the crystalline region of cellulose and expose more hydroxyl groups. The contact angle and sliding angle of filter paper were improved by ZnCl₂ pretreatment with the optimum values of 154.8° and 6°， respectively. The contact angle of the pretreated superhydrophobic filter paper remained above 150° when the paper was in a neutral solution （pH value of 4~10）， indicating that ZnCl₂ pretreatment improved the chemical stability and thermal stability of the filter paper. The hydrophobic filter paper maintained a separation efficiency of more than 95% after 30 times of separation towards thichloromethane.