本文選題：PVDF　切入點(diǎn)：GO　出處：《天津工業(yè)大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：PVDF因其優(yōu)異的化學(xué)穩(wěn)定性、耐熱性及其良好的成膜性能而被廣泛的應(yīng)用于超濾膜的制備。然而由于其強(qiáng)疏水性,使其在使用過(guò)程中極易發(fā)生膜污染從而造成通量的衰減。本文通過(guò)化學(xué)方法將親水性無(wú)機(jī)納米碳材料氧化石墨烯(GO)和親水改性劑聚乙二醇(PEG)通過(guò)接枝制備了 GO-PEG復(fù)合材料(f-GO),并將其作為添加劑共混于PVDF鑄膜液中,利用浸沒(méi)沉淀法制備出擁有較強(qiáng)抗污染性能的PVDF復(fù)合超濾膜。本研究利用FTIR、靜態(tài)接觸角、SEM、AFM測(cè)試,考察了 GO-PEG對(duì)PVDF膜的表面化學(xué)組成、親水性、孔道結(jié)構(gòu)及表面形貌的影響。結(jié)果表明,隨著GO和f-GO的添加量從Owt%增大到1.Owt%時(shí),PVDF膜表面的親水性得到了增強(qiáng),并且添加f-GO的PVDF膜表現(xiàn)了更佳的親水性,膜表面接觸角從基膜的72°降低到59°。另外,添加f-GO,PVDF膜的孔道結(jié)構(gòu)也發(fā)生了不同于基膜和GO復(fù)合膜的變化,孔徑增大,表面孔隙率明顯增加。膜表面粗糙度也較基膜有所降低,基膜的Sa為118nm,f-GO復(fù)合膜的粗糙度最低達(dá)到了 71.1nm。當(dāng)f-GO添加量從Owt%增加到0.5wt%時(shí),PVDF膜的純水通量表現(xiàn)出了先增大后減小的趨勢(shì),當(dāng)添加量為0.5wt%時(shí),膜純水通量達(dá)到最大,為93L·m-2·h·1,增加了100%。復(fù)合膜的BSA截留率并沒(méi)有太大變化,都可達(dá)到95%以上。當(dāng)f-GO的添加量從Owt%增加到1.Owt%時(shí),PVDF膜的抗污染性能也受到了不同的影響。對(duì)于BSA、HA等有機(jī)污染,f-GO復(fù)合膜膜總阻力和不可逆阻力均要低于PVDF基膜和GO復(fù)合膜。當(dāng)添加量為0.5wt%時(shí),膜阻力達(dá)到最低。對(duì)于BSA、HA污染,不可逆阻力相比于基膜降低了 83.7%、84.4%。膜污染后,經(jīng)過(guò)簡(jiǎn)單的表面清洗,f-GO復(fù)合膜仍然可以獲得很高的通量恢復(fù)率(FRR)。當(dāng)添加量為0.5wt%時(shí),擁有最高的FRR,BSA污染的FRR為78%,HA污染的FRR為74%,而PVDF基膜卻只有50%和47%的FRR。通過(guò)復(fù)合膜多周期運(yùn)行,膜通量隨著時(shí)間的變化結(jié)果顯示,f-GO復(fù)合膜經(jīng)過(guò)三個(gè)周期的運(yùn)行后,無(wú)論是BSA通量,還是純水通量,復(fù)合膜仍然保持著很高的滲透性,并且逐漸的膜通量達(dá)到穩(wěn)定,不再衰減,而PVDF基膜的通量衰減嚴(yán)重。以銅綠假單胞菌為目標(biāo)菌種,研究膜的抑菌性和抗生物污染性能。在復(fù)合膜抑菌性方面的研究發(fā)現(xiàn),f-GO和GO復(fù)合膜的抑菌性均要好于PVDF基膜,但是f-GO和GO復(fù)合膜在抑菌性方面并沒(méi)有表現(xiàn)出太大的差異。相比于PVDF基膜,當(dāng)添加量為0.5wt%時(shí),f-GO復(fù)合膜的不可逆阻力降低了 87%。并且經(jīng)菌液污染后,膜表面經(jīng)過(guò)相同的去離子水清洗,f-GO復(fù)合膜的通量恢復(fù)率即可達(dá)到80%,而基膜通量恢復(fù)率只有60%。綜合以上結(jié)果說(shuō)明,添加f-GO復(fù)合材料后,PVDF膜的親水性和抗有機(jī)污染性能得到明顯的強(qiáng)化。而盡管f-GO復(fù)合膜抑菌性能并沒(méi)有表現(xiàn)出比GO復(fù)合膜更好的效果,但是f-GO復(fù)合膜的抗生物污染性能得到了有效的增強(qiáng)。
[Abstract]:PVDF is widely used in the preparation of ultrafiltration membranes because of its excellent chemical stability, heat resistance and good film forming properties. However, because of its strong hydrophobicity, In this paper, the hydrophilic inorganic nano-carbon materials graphene oxide (GOO) and hydrophilic modifier polyethylene glycol (PEG) were grafted to prepare GO-PEG by chemical method. The composite materials were mixed in PVDF casting solution as additives. PVDF composite ultrafiltration membrane was prepared by immersion precipitation method. The surface chemical composition and hydrophilicity of GO-PEG on PVDF membrane were investigated by FTIR and static contact angle test. The results showed that the hydrophilicity of PVDF membrane was enhanced with the increase of go and f-go content from Owt% to 1.Owt%, and the hydrophilicity of PVDF membrane with f-go was better. The surface contact angle of the membrane was reduced from 72 擄to 59 擄. In addition, the pore structure of the PVDF membrane was different from that of the base film and go composite membrane. The pore size increased and the surface porosity increased obviously. The surface roughness of the membrane was also lower than that of the base film. The lowest roughness of the composite membrane was 71.1 nm. When the amount of f-go was increased from Owt% to 0.5wt%, the pure water flux of PVDF membrane increased first and then decreased, and the pure water flux of PVDF membrane reached the maximum when the addition amount was 0.5wt%. 93L 路m -2 路h 路h 路1, increased 100%. The BSA rejection rate of the composite membrane did not change significantly. When the amount of f-go was increased from Owt% to 1.Owt%, the antifouling performance of PVDF membrane was also affected. The total resistance and irreversible resistance of PVDF / go composite membrane were lower than those of PVDF and go membranes. When the addition amount is 0.5 wt%, The membrane resistance reached the lowest. For BSA-HA pollution, the irreversible resistance was 83.7% lower than that of the base membrane. After membrane fouling, a high flux recovery rate of FRRRN could still be obtained after simple surface cleaning. When the amount of BSA-HA was 0.5 wt%, The FRR with the highest FRRN BSA pollution was 78g HA contaminated FRR 74, while the PVDF base membrane had only 50% and 47% FRRs.Through the multiperiod operation of the composite membrane, the change of membrane flux with time showed that the f-go composite membrane had run through three cycles, whether BSA flux or not. The membrane flux is still pure water, and the membrane flux is stable, but the flux of PVDF base membrane decays seriously. Pseudomonas aeruginosa is taken as the target strain. The bacteriostasis and anti-fouling properties of the composite membrane were studied. It was found that the bacteriostasis of the composite membrane was better than that of the PVDF substrate membrane, and the bacteriostasis of the composite membrane was better than that of the PVDF substrate membrane. However, the bacteriostatic properties of f-GO and go composite membranes were not significantly different from those of PVDF. Compared with PVDF substrate, the irreversible resistance of f-go / go composite membranes was reduced by 87wt% when the dosage was 0.5 wt%. After the same deionized water cleaning, the flux recovery rate of the membrane can reach 80%, while the flux recovery rate of the base membrane is only 60%. The hydrophilicity and organic pollution resistance of PVDF membrane were obviously enhanced after adding f-go composite material, but the bacteriostatic property of f-go composite membrane was not better than that of go composite membrane. But the anti-pollution performance of F-go composite membrane was enhanced effectively.
【學(xué)位授予單位】：天津工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TQ051.893;X703

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