基于电纺预处理溶解浆的纤维素复合膜制备与应用

Preparation and Application of Cellulose Composite Membrane based on Electrospinning-pretreated Dissolving Pulp

以溶解浆为原料,三氟乙酸(TFA)和二氯乙烷(DCE)为溶解体系,通过预添加聚环氧乙烯(PEO)增稠剂和Cu(Ac)_(2)前驱体制得纺丝液,并利用静电纺丝预处理技术,成功制得负载有机金属框架物(MOF,即HKUST-1)的电纺纤维素复合膜(HKUST-1@CF),探讨了溶解浆种类、TFA/DCE体积比、PEO和Cu(Ac)_(2)添加量等对HKUST-1@CF结构与性能的影响。结果表明,当选用阔叶木溶解浆为原料、TFA/DCE体积比为6∶4、纤维素/PEO/Cu(Ac)_(2)质量比为10∶2∶3时,纤维素纺丝性能最佳;预添加PEO与Cu(Ac)_(2)有助于MOF负载(最高负载量达16.1%),且HKUST-1@CF膜表现出优异的油水分离性(分离效率98%)及良好的抑菌性能(抑菌圈3.1 mm),其在膜分离及环境治理方面具有潜在应用价值。

A novel cellulose composite membrane,HKUST-1@CF loaded with metal-organic frame(MOF,i.e.,HKUST-1),was prepared by electrospinning pretreatment using dissolving pulp as raw material and trifluoroacetic acid(TFA)/dichloroethane(DCE)as dissolving system.Polyethylene oxide(PEO)and copper acetate(Cu(Ac)_(2))were pre-added into the dissolving system as thickener and precursor,respectively,to fabricate spinning dope system.The effects of dissolving pulp type,TFA/DCE volume ratio,and PEO and Cu(Ac)_(2) dosages on the structure and properties of HKUST-1@CF were comprehensively investigated.The results showed that when hardwood dissolving pulp was used as raw material,the volume ratio of TFA/DCE was 6∶4 and the mass ratio of cellulose/PEO/Cu(Ac)_(2) was 10∶2∶3,cellulose had the best spinning performance.The pre-addition of PEO and Cu(Ac)_(2) contributed to the HKUST-1 load,up to 16.1%.The as-prepared composite membrane showed excellent oil-water separation with separation efficiency of 98%and good bacterial inhibition performance with inhibition circle of 3.1 mm,showing potential application value in membrane separation and environmental governance.