纳米纤维素/滤纸浆复合微滤膜的制备与性能  

Preparation and Properties of Cellulose Nanofibers/Filter Paper Pulp Composite Microfiltration Membranes

作　　者：张文文 俞娟 张丽君 范一民[1] Zhang Wenwen;Yu Juan;Zhang Lijun;Fan Yimin(Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources/Key Laboratory of Forestry Genetics&Biotechnology of Ministry of Education/College of Chemical Engineering,Nanjing Forestry University,Nanjing 210037)

机构地区：[1]江苏省林业资源高效加工利用协同创新中心/林木遗传与生物技术省部共建教育部重点实验室/南京林业大学化学工程学院,南京210037

出　　处：《林业科学》2020年第9期112-118,共7页Scientia Silvae Sinicae

基　　金：国家自然科学基金青年项目(31901275)。

摘　　要：【目的】制备一种价格低廉、生产工艺简单、性能优良的纳米纤维素/滤纸浆复合微滤膜,研究不同复合膜定量、纳米纤维素添加量对复合微滤膜过滤性能和机械性能的影响,为纳米纤维素/滤纸浆复合微滤膜的工业化应用提供理论依据。【方法】采用成熟纸张生产工艺,将滤纸浆(FPP)和纳米纤维素(CNF)通过一步配抄法制备得到复合微滤膜。分别测试复合微滤膜中CNF留着率、纯水通量、面涂重质碳酸钙(GCC)截留率、机械性能并观察其微观形貌,分析CNF留着率、CNF添加量、复合膜定量对复合微滤膜纯水通量、GCC截留率和机械性能的影响。【结果】添加Al Cl3可使CNF成功留着于复合微滤膜中,CNF(g)/Al Cl3(mmol)配比为3∶2时,CNF留着率达100%;随着CNF添加量及复合膜定量提高,复合微滤膜的纯水通量降低、GCC截留率增加;当CNF添加量为20%、复合膜定量为50 g·m-2时,复合微滤膜的GCC截留率最高达85.94%,纯水通量仅为1 814 L·m-2h-1;CNF留着可明显提高复合微滤膜的机械性能,复合微滤膜的抗张强度最高达2.619 k N·m-1,是纯滤纸浆膜的2倍;复合微滤膜微观形貌分析表明,CNF能够搭接在滤纸基材上,降低滤纸基材孔隙率。【结论】在CNF分散液中加入Al Cl3,可实现CNF的截留并嵌入复合到滤纸浆中;复合膜定量越高、CNF添加量越大,复合微滤膜的纯水通量越小,对应的GCC截留率越高。当CNF添加量为20%时,复合微滤膜的GCC截留率最高达85.94%,纯水通量仅为1 814 L·m-2h-1;CNF强度较高,且能在滤纸基材中形成交联搭接,降低滤纸基材孔隙率,所有复合微滤膜的过滤性能和机械性能均优于纯滤纸浆膜。【Objective】The research aimed to develop a cellulose nanofibers/filter paper(CNF/FPP)composite microfiltration membrane with a low price,a simple production process and an excellent performance.The effects of basis weight of the composite membranes and CNF additions on the filtration performances and mechanical properties of the composite microfiltration membrane were investigated.This study was expect to provide a theoretical basis for the industrial application of the composite CNF/FPP microfiltration membrane.【Method】The mature paper production technology was adopted to prepare the composite microfiltration membranes by combining the filter paper pulp(FPP)and cellulose nanofibers(CNF).The CNF retention rate,pure water flux,GCC retention rate,mechanical properties and micro morphology were tested,respectively.The effects of CNF retention,CNF addition and the quantification of composite membranes on the pure water flux,GCC rejection as well as mechanical properties of the composite microfiltration membranes were further studied.【Result】The addition of AlCl3 was beneficial to the aggregation of CNF,leading it bedded into the composite microfiltration membranes.When the ratio of CNF(g)/AlCl3(mmol)was 3∶2,the retention rate of CNF reached 100%.With the increase of the amount of CNF and the quantitative value of the composite membrane,the pure water flux of the composite microfiltration membrane was decreased and the retention rate of GCC was increased.Specifically,when the amount of CNF was 20%and the composite membrane was 50 g·m-2,the composite membranes possessed the highest retention rate(up to 85.94%)and the pure water flux was 1814 L·m-2 h-1.In addition,the mechanical properties of the composite microfiltration membrane were obviously improved with the retention of CNF.Especially,the tensile strength of the composite microfiltration membrane was up to 2.619 kN·m-1,which was twice that of the pure FPP pulp membrane.The micromorphology analysis of the composite microfiltration membrane further

关 键 词：纳米纤维素 滤纸浆 复合 微滤膜 

分 类 号：TB332[一般工业技术—材料科学与工程]