Functionalized Multiwalled Carbon Nanotubes ( MWCNTs )
Functionalized Multiwalled Carbon Nanotubes ( MWCNTs )
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发表时间：
2016
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通讯作者：
Shuang-Mei Xue;Zhen-liang Xu;Yong-Jian Tang;Chen-Hao Ji
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作者：
Shuang-Mei Xue;Zhen-liang Xu;Yong-Jian Tang;Chen-Hao Ji
本工作将三种分别带有羧基（MWCNT-COOH）、羟基（MWCNT-OH）和氨基（MWCNT-NH）的改性多壁碳纳米管（MWCNTs）加入到含有哌嗪（PIP）的水相中，通过界面聚合法制备纳米复合纳滤膜。考察了多壁碳纳米管表面官能团对改性纳滤膜性能的影响。采用TEM、FT-IR、TGA等手段对碳纳米管进行了表征，并采用XPS、TEM、AFM和接触角等手段对膜的性能进行了评价。XPS结果证明MWCNT成功地掺入到改性纳滤膜的活性层中。当MWCNT的质量分数为0.01%（w/v）时，复合膜的分离性能最佳，其中MWCNT-OH复合膜的水通量最高，为41.4L·m-2·h-1，对Na 2SO 4的截留率为97.6%，而MWCNT-COOH复合膜的截留率最低，为96.6%。改性后的多壁碳纳米管中官能团的亲水性增加，导致纳米复合膜的表面形貌、厚度和结晶度不同。所有膜的截留分子量（MWCO）均在300 Da以内，操作稳定性良好。
In this work, three modified multiwalled carbon nanotubes (MWCNTs) with carboxyl (MWCNT-COOH), hydroxyl (MWCNT-OH) and amino groups (MWCNT-NH), respectively, were added into the aqueous phase containing piperazine (PIP) to fabricate the nanocomposite nanofiltration (NF) membranes via interfacial polymerization. The influences of functional groups of MWCNTs on the performance of modified NF membrane were investigated. The MWCNTs were characterized by TEM, FT-IR and TGA; meanwhile, the properties of the membranes were evaluated by XPS, TEM, AFM and contact angle. The XPS results proved the successful incorporation of MWCNT in the active layer of modified NF membrane. When the MWCNT concentration is 0.01% (w/v), all the nanocomposite membranes possessed the optimal separation properties, among which the membrane incorporated with MWCNT-OH demonstrated the highest water flux of 41.4 L·m−2·h−1 and the Na2SO4 rejection of 97.6% whereas the one with MWCNT-COOH had the relative lowest rejection of 96.6%. Furthermore, the increased hydrophilicity of functional groups in modified MWCNTs resulted in different nodular surface morphologies, thicknesses and hydrophilicities of the nanocomposite membranes. All the membranes possessed a molecular weight cutoff (MWCO) within 300 Da and good operation stability.