Chung Youngkun, Park Daeseon, Kim Hyojeon, Nam Seung-Eun, Kang Seoktae
Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Daejeon 305-701, Republic of Korea.
Green Carbon Research Center, Chemical and Process Technology Division, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeongro, Yuseong, Daejeon 34114, Republic of Korea.
Water Res. 2022 May 15;215:118268. doi: 10.1016/j.watres.2022.118268. Epub 2022 Mar 8.
This study demonstrates a simple and novel preparation method to prepare ceramic nanofiltration membranes with a precise and tunable molecular weight cut-off (MWCO) by packing variously sized nanoparticles into existing membrane pores. As a result, ceramic membranes with a MWCO from 1000 Da to 10,000 Da were successfully prepared with the narrow distribution of the pore size after the filtration-coating process. In addition, the effective porosity of the ceramic membranes was calculated from the results of the membrane properties by the Hagen-Poiseuille equation which fit within the range of the sphere packing theory from 17.3% to 41.8%. Furthermore, the results of nonlinear curve fitting between the MWCO and the nanoparticle size show a high accuracy, which implies that the MWCO of the ceramic membranes can be predicted using the curve fitting model with variously sized nanoparticles in the filtration-coating process. In conclusion, the novel filtration-coating method enables precise pore control and provides a tunable MWCO to ceramic membranes by preparing various sizes of nanoparticles.
本研究展示了一种简单新颖的制备方法，通过将各种尺寸的纳米颗粒填充到现有膜孔中，来制备具有精确且可调截留分子量（MWCO）的陶瓷纳滤膜。结果，在过滤涂层过程后成功制备出了截留分子量在1000道尔顿至10000道尔顿之间的陶瓷膜，其孔径分布狭窄。此外，根据膜性能结果，通过符合球体填充理论范围（17.3%至41.8%）的哈根-泊肃叶方程计算出了陶瓷膜的有效孔隙率。此外，截留分子量与纳米颗粒尺寸之间的非线性曲线拟合结果显示出高精度，这意味着在过滤涂层过程中，可以使用含有各种尺寸纳米颗粒的曲线拟合模型来预测陶瓷膜的截留分子量。总之，这种新颖的过滤涂层方法能够实现精确的孔径控制，并通过制备各种尺寸的纳米颗粒为陶瓷膜提供可调的截留分子量。
