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Study on Improving the Performance of Superhydrophobic Filter Paper by ZnCl2 Pretreatment |
Received:March 11, 2021 |
DOI:10.11980/j.issn.0254-508X.2021.07.013 |
Key Words:filter paper superhydrophobic ZnCl2 pretreatment nano silica |
Fund Project:浙江省基础公益研究计划/工业项目(LGG19C160001);浙江省重点研发项目(2019C01156);浙江省26县绿色技术应用项目(2019C02042)。 |
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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. |
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