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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）。
Author NameAffiliationPostcode
CAO Xinyu Zhejiang Key Lab of Biomass Recycling and Ecological Treatment， Zhejiang University of Science and Technology， Hangzhou， Zhejiang Province， 310023 310023
HUANG Guanhong Zhejiang Key Lab of Biomass Recycling and Ecological Treatment， Zhejiang University of Science and Technology， Hangzhou， Zhejiang Province， 310023 310023
HU Zhijun Zhejiang Key Lab of Biomass Recycling and Ecological Treatment， Zhejiang University of Science and Technology， Hangzhou， Zhejiang Province， 310023 310023
ZHANG Lu Zhejiang Key Lab of Biomass Recycling and Ecological Treatment， Zhejiang University of Science and Technology， Hangzhou， Zhejiang Province， 310023 310023
CAO Yuchen Zhejiang Key Lab of Biomass Recycling and Ecological Treatment， Zhejiang University of Science and Technology， Hangzhou， Zhejiang Province， 310023 310023
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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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