TY - JOUR
T1 - Two-Dimensional Interlayer Space Induced Horizontal Transformation of Metal–Organic Framework Nanosheets for Highly Permeable Nanofiltration Membranes
AU - Wang, Zheng
AU - Nakagawa, Keizo
AU - Guan, Kecheng
AU - Song, Qiangqiang
AU - Zhou, Siyu
AU - Tanaka, Shunsuke
AU - Okamoto, Yasunao
AU - Matsuoka, Atsushi
AU - Kamio, Eiji
AU - Li, Guangchao
AU - Li, Molly Meng Jung
AU - Yoshioka, Tomohisa
AU - Matsuyama, Hideto
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grant No. (JP22H01849). The authors thank Dr. Kobayashi Shintaro and Dr. Shogo Kawaguchi for their assistance in the synchrotron radiation experiments performed at BL02B2 SPring-8 with the support of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No.2022B0539). [Correction added after publication 16 August 2023: Fig. 2 was corrected.]
Funding Information:
This work was supported by JSPS KAKENHI Grant No. (JP22H01849). The authors thank Dr. Kobayashi Shintaro and Dr. Shogo Kawaguchi for their assistance in the synchrotron radiation experiments performed at BL02B2 SPring‐8 with the support of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No.2022B0539).
Publisher Copyright:
© 2023 Wiley-VCH GmbH.
PY - 2023/4
Y1 - 2023/4
N2 - Laminar membranes comprising graphene oxide (GO) and metal–organic framework (MOF) nanosheets benefit from the regular in-plane pores of MOF nanosheets and thus can support rapid water transport. However, the restacking and agglomeration of MOF nanosheets during typical vacuum filtration disturb the stacking of GO sheets, thus deteriorating the membrane selectivity. Therefore, to fabricate highly permeable MOF nanosheets/reduced GO (rGO) membranes, a two-step method is applied. First, using a facile solvothermal method, ZnO nanoparticles are introduced into the rGO laminate to stabilize and enlarge the interlayer spacing. Subsequently, the ZnO/rGO membrane is immersed in a solution of tetrakis(4-carboxyphenyl)porphyrin (H2TCPP) to realize in situ transformation of ZnO into Zn-TCPP in the confined interlayer space of rGO. By optimizing the transformation time and mass loading of ZnO, the obtained Zn-TCPP/rGO laminar membrane exhibits preferential orientation of Zn-TCPP, which reduces the pathway tortuosity for small molecules. As a result, the composite membrane achieves a high water permeance of 19.0 L m−2 h−1 bar−1 and high anionic dye rejection (>99% for methyl blue).
AB - Laminar membranes comprising graphene oxide (GO) and metal–organic framework (MOF) nanosheets benefit from the regular in-plane pores of MOF nanosheets and thus can support rapid water transport. However, the restacking and agglomeration of MOF nanosheets during typical vacuum filtration disturb the stacking of GO sheets, thus deteriorating the membrane selectivity. Therefore, to fabricate highly permeable MOF nanosheets/reduced GO (rGO) membranes, a two-step method is applied. First, using a facile solvothermal method, ZnO nanoparticles are introduced into the rGO laminate to stabilize and enlarge the interlayer spacing. Subsequently, the ZnO/rGO membrane is immersed in a solution of tetrakis(4-carboxyphenyl)porphyrin (H2TCPP) to realize in situ transformation of ZnO into Zn-TCPP in the confined interlayer space of rGO. By optimizing the transformation time and mass loading of ZnO, the obtained Zn-TCPP/rGO laminar membrane exhibits preferential orientation of Zn-TCPP, which reduces the pathway tortuosity for small molecules. As a result, the composite membrane achieves a high water permeance of 19.0 L m−2 h−1 bar−1 and high anionic dye rejection (>99% for methyl blue).
KW - anionic dye removal
KW - in situ transformation
KW - laminar membranes
KW - metal–organic framework nanosheets
KW - reduced graphene oxide
UR - http://www.scopus.com/inward/record.url?scp=85152910759&partnerID=8YFLogxK
U2 - 10.1002/smll.202300672
DO - 10.1002/smll.202300672
M3 - Journal article
AN - SCOPUS:85152910759
SN - 1613-6810
VL - 19
JO - Small
JF - Small
IS - 33
M1 - 2300672
ER -