脱乙酰基改性乙酸纤维薄膜对乳化油分离及积垢机理的探究

doi:10.16085/j.issn.1000-6613.2020-1508

化工进展 ›› 2021, Vol. 40 ›› Issue (10): 5415-5423.DOI: 10.16085/j.issn.1000-6613.2020-1508

脱乙酰基改性乙酸纤维薄膜对乳化油分离及积垢机理的探究

饶瑞晔¹^,²^,³(), 毛竹简¹^,², 林晓榆¹^,², 郭绍英¹^,², 胡家朋¹^,²()

^1.武夷学院生态与资源工程学院, 福建武夷山 354300
^2.福建省生态产业绿色技术重点实验室（武夷学院），福建武夷山354300
^3.福建省竹材工程技术研究中心(武夷学院)，福建武夷山354300

收稿日期:2020-07-31 修回日期:2020-09-26 出版日期:2021-10-10 发布日期:2021-10-25
通讯作者: 胡家朋
作者简介:饶瑞晔（1981—），男，副教授，主要研究方向为环境功能材料及水污染治理与控制。E-mail：jyrau@wuyiu.edu.cn。
基金资助:
国家自然科学基金(51406141);福建省科技计划区域发展项目(2020H4026);福建省自然基金面上项目(2020J01411);福建省教育厅中青年项目(JAT200663);武夷学院启动经费(YJ202009)

Study on the separation of emulsified oil and fouling mechanism by deacetylated cellulose scetate membrane

RAU Juiyeh¹^,²^,³(), MAO Zhujian¹^,², LIN Xiaoyu¹^,², GUO Shaoying¹^,², HU Jiapeng¹^,²()

^1.Department of Ecology and Resource Engineering, Wuyi University, Wuyishan 354300, Fujian, China
^2.Fujian Provincial Key Laboratory of Eco-Industrial Green Technology (Wuyi University), Wuyishan 354300, Fujian, China
^3.Fujian Provincial Bamboo Engineering Technology Reserach Center (Wuyi University), Wuyishan 354300, Fujian, China

Received:2020-07-31 Revised:2020-09-26 Online:2021-10-10 Published:2021-10-25
Contact: HU Jiapeng

摘要/Abstract

摘要：

利用静电纺丝制造乙酸纤维素膜（CA纤维膜），并利用添加TiO₂及脱乙酰基（d-CA）对CA纤维膜进行改性，后续对膜过滤特性、渗透通量、油水乳化液去除效率、反洗特性及积垢机制进行讨究。结果显示，CA纤维膜通过TiO₂及d-CA改性后可以提高膜的热稳定性及亲水性能，并得到稳定的纯水通量和过滤通量；最佳的比例为TiO₂@d-18.5%CA纤维膜，在40kPa跨膜压差、60min的操作条件下，其纯水通量、过滤通量、1g/L油水乳化液去除效率以及反洗后通量分别为824.8L/(m²·h)、(311.3±12.5)L/(m²·h)、93.6%±1.1%、451.5L/(m²·h)；另外，添加TiO₂可能导致油水乳化液在膜表面不可逆阻力比例的增加，脱乙酰基改性CA纤维膜则可以降低膜自身阻力及增加可逆阻力的比例，提高CA纤维膜在油水分离方面的潜力。

关键词: 静电纺丝, 乙酸纤维素薄膜, 油水乳化液, 脱乙酰基

Abstract:

In this research, the cellulose acetate membrane (CA fiber membrane) was produced by electrostatic spinning, and the prepared CA membrane was modified by added TiO₂ powder and deacetylated cellulose acetate (d-CA). After, the membrane filtration characteristics, permeation flux, removal efficiency of oil/water emulsion and membrane resistances were discussed. The results showed that the thermal stability and superhydrophilicity of the modification CA fiber membrane could be improved by TiO₂ and D-CA, and the stable water and filtration flux were obtained. In operation conditions at 40kPa and 60 minutes, the TiO₂@d-18.5%CA membranes were good membrane with water flux, filtration flux, removal efficiency of oil/water emulsion and backwash flux of 824.8L/(m²·h), (311.3±12.5)L/(m²·h), 93.6%±1.1% and 451.5L/(m²·h), respectively. The addition of TiO₂ might lead to an increase in the irreversible resistance ratio of oil on the membrane surface. However, the d-CA modified could reduce the fiber membrane resistance and increase the proportion of reversible resistance, and improve the potential of CA fiber membrane in oil-water separation.

Key words: electrostatic spinning, cellulose acetate fiber membrane, oil-water emulsion, deacetylated cellulose acetate (d-CA)

中图分类号:

饶瑞晔, 毛竹简, 林晓榆, 郭绍英, 胡家朋. 脱乙酰基改性乙酸纤维薄膜对乳化油分离及积垢机理的探究[J]. 化工进展, 2021, 40(10): 5415-5423.

RAU Juiyeh, MAO Zhujian, LIN Xiaoyu, GUO Shaoying, HU Jiapeng. Study on the separation of emulsified oil and fouling mechanism by deacetylated cellulose scetate membrane[J]. Chemical Industry and Engineering Progress, 2021, 40(10): 5415-5423.

图/表 10

表1 不同膜的比例及改性方式一览表

膜编号	CA /%	TiO₂ /g	丙酮 /mL	DMAC /mL	NaOH /mol·L^-1
M1（17%CA）	17	0	13.3	6.7	0
M2（TiO₂@17%CA）	17	0.1	13.3	6.7	0
M3（TiO₂@d-17%CA）	17	0.1	13.3	6.7	0.5
M4（18.5%CA）	18.5	0	13.3	6.7	0
M5（TiO₂@18.5%CA）	18.5	0.1	13.3	6.7	0
M6（TiO₂@d-18.5%CA）	18.5	0.1	13.3	6.7	0.5
M7（20%CA）	20	0	13.3	6.7	0
M8（TiO₂@20%CA）	20	0.1	13.3	6.7	0
M9（TiO₂@d-20%CA）	20	0.1	13.3	6.7	0.5

图1 TiO2粉末的表面形态及晶型

图2 膜组测试装置

图3 改性前后各CA纤维膜的纯水通量及自身膜阻力变化

图4 改性前后各CA纤维膜的油水乳化液过滤通量及去除效率变化

图5 改性前后各CA纤维膜的水接触角值变化(n=3)

图6 改性前后各CA纤维膜的表面形貌

图7 改性前后各CA纤维膜的红外图谱

图8 改性前后各CA纤维膜的TGA曲线

图9 改性前后各CA纤维膜的各阻力值及其比例分布

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脱乙酰基改性乙酸纤维薄膜对乳化油分离及积垢机理的探究

Study on the separation of emulsified oil and fouling mechanism by deacetylated cellulose scetate membrane

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