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摘要
以渗透汽化膜法脱盐为研究背景,针对目前氧化石墨烯膜(GOM)易溶胀、稳定性差和渗透通量衰减等缺点,采用疏水、亲水、原位合成方法制备了3种纳米二氧化硅(SiO2)对GOM进行插层修饰,进而制备SiO2@氧化石墨烯(SiO2@GO)膜。通过傅里叶红外变换光谱仪(FT-IR)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)、接触角测量仪等方法表征其化学组分、形貌、晶体结构和亲水性。渗透汽化脱盐实验表明,疏水性SiO2@GO杂化膜脱盐性能优于亲水性SiO2@GO和原位制备SiO2@GO膜,且当SiO2与GO质量比为0.2时,疏水性SiO2@GO杂化膜水通量可达103.4kg/(m2·h),盐截留率为99.8%(70℃,3.5% NaCl溶液),在连续12h测试中分离性能保持稳定,表明疏水性SiO2@GO杂化膜在渗透汽化脱盐领域有着广阔的应用前景。
Abstract
Based on the background of desalination via pervaporation,in response to the current drawbacks of graphene oxide membranes (GOM) such as easy swelling,poor stability,and decreased permeation flux,the hydrophilic,hydrophobic and in-situ synthesis methods were used to prepare three kinds of nano-silica (SiO2) for the intercalation modification of GOM,thereby preparing SiO2@GO hybrid membranes.The chemical composition,morphology,crystal structure and hydrophilicity were characterized by Fourier transform infrared spectroscopy (FT-IR),scanning electron microscopy (SEM),X-ray diffraction (XRD) and contact angle measurement.Pervaporation desalination experiments showed that the hydrophobic SiO2@GO hybrid membrane exhibited superior desalination performance compared to the hydrophilic SiO2@GO and in-situ prepared SiO2@GO hybrid membranes.As the mass ratio of SiO2 to GO was 0.2,the permeation flux of the hydrophobic SiO2@GO hybrid membrane reached 103.4kg/(m2·h),with a salt rejection rate of 99.8% (70℃,3.5wt% NaCl solution).The separation performance remained stable during continuous 12-hour test,indicating that the hydrophobic SiO2@GO hybrid membrane had broad application prospects in the field of pervaporation desalination.
关键词
二氧化硅
/
氧化石墨烯
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杂化膜
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渗透汽化
/
脱盐
Key words
silica
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graphene oxide
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hybrid membrane
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pervaporation
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desalination
SiO2@GO杂化膜的制备及其渗透汽化脱盐性能研究[J].
化工新型材料, 2024, 52(7): 93-97 DOI:10.19817/j.cnki.issn1006-3536.2024.07.057
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基金资助
北京市自然科学基金委-北京市教委联合资助项目(KZ201910011012)
