CAJ | 학술논문

采用混酸(H2SO4/HNO3=3/1(V/V))处理多壁碳纳米管(MWNTs)制备了羧基化碳管(Carboxylated MWNTs)，并与哌嗪(PIP)反应，制备了胺化的多壁纳米碳管(Amine functionalized MWNTs)。以聚砜(PSf)超滤膜为基膜，以均苯三甲酰氯(TMC)为油相单体和胺化的多壁纳米碳管与哌嗪(PIP)为水相单体，采用界面聚合法制得多壁碳纳米管改性聚哌嗪酰胺复合纳滤膜。采用傅里叶红外光谱(FT-IR)、拉曼光谱(RAM)、X射线光电子能谱(XPS)和扫描电子显微镜(SEM)和静态接触角表征了改性前后碳纳米管和复合膜的结构，结果表明哌嗪成功氨化改性了碳纳米管，基膜表面复合了一层聚哌嗪酰胺膜。重点考察了碳管在水相中添加量、TMC浓度、聚合时间对复合膜性能的影响，结果显示，在有机相单体浓度为1 g×L-1，水相单体浓度为2 g×L-1，水相中多壁碳纳米管的浓度为0.1 g×L-1，反应时间为45 s，复合膜的纯水通量为85.6 L×m-2×h-1，Na2SO4的截留率达到98%，对不同盐溶液的截留效果分别为：Na2SO4>MgSO4>MgCl2>NaCl。水相中碳纳米管的加入，能有效改善膜的分离性能。
채용혼산(H2SO4/HNO3=3/1(V/V))처리다벽탄납미관(MWNTs)제비료최기화탄관(Carboxylated MWNTs)，병여고진(PIP)반응，제비료알화적다벽납미탄관(Amine functionalized MWNTs)。이취풍(PSf)초려막위기막，이균분삼갑선록(TMC)위유상단체화알화적다벽납미탄관여고진(PIP)위수상단체，채용계면취합법제득다벽탄납미관개성취고진선알복합납려막。채용부리협홍외광보(FT-IR)、랍만광보(RAM)、X사선광전자능보(XPS)화소묘전자현미경(SEM)화정태접촉각표정료개성전후탄납미관화복합막적결구，결과표명고진성공안화개성료탄납미관，기막표면복합료일층취고진선알막。중점고찰료탄관재수상중첨가량、TMC농도、취합시간대복합막성능적영향，결과현시，재유궤상단체농도위1 g×L-1，수상단체농도위2 g×L-1，수상중다벽탄납미관적농도위0.1 g×L-1，반응시간위45 s，복합막적순수통량위85.6 L×m-2×h-1，Na2SO4적절류솔체도98%，대불동염용액적절류효과분별위：Na2SO4>MgSO4>MgCl2>NaCl。수상중탄납미관적가입，능유효개선막적분리성능。
Carboxylated multi-wall carbon nanotube was prepared by treating the multi-wall carbon nanotube (MWNTs) with mixed acid (H2SO4/HNO3=3/1(V/V)). Amine functionalized MWNTs was obtained by reacting the carboxylated MWNT with piperazine (PIP). Using the polysulfone (PSf) ultrafiltration membrane as the support, the PIP and amine functionalized MWNTs as aqueous monomer and trimesoylchloride (TMC) as organic monomer, the polypiperazine-amide composite nanofiltration membranes were prepared by interfacial polymerization. The structures of the membrane before and after modification were characterized by the spectra of Fourier transform infrared spectrophotometry (FT-IR), Raman spectrophotometry (RAM), Scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and contacting angle. The results show that the MWNT is amine-functionalized by PIP, and a thin layer composed of polypiperazine-amide is formed on the support. The effects of MWNT adding amount in the aqueous phase, TMC concentration and reaction time on the composite membranes were investigated. The results show that when the concentration of organic phase monomer is 1 g×L-1, the concentration of water phase monomer is 2 g×L-1, the concentration of MWNTs in water phase is 0.1 g×L-1, the time of reaction is 45 s, the pure water flux is 85.6 L×m-2×h-1, which are the optimum condition, the retention ratio of Na2SO4 can reach 98%. The salt rejection order of the composite membrane is Na2SO4﹥MgSO4﹥MgCl2﹥NaCl. The separation performance of composite membrane could be improved by adding the MWNTs into the water phase.