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Self-Assembly in "Matrix-Free" Functionalized Boron Nitride Sheets as Free-Standing Thin Film Sieves for Stable Forward Osmosis and Robust Dye Removal Applications

Samantaray, Paresh Kumar and Sen Gupta, Ria and Bose, Suryasarathi (2023) Self-Assembly in "Matrix-Free" Functionalized Boron Nitride Sheets as Free-Standing Thin Film Sieves for Stable Forward Osmosis and Robust Dye Removal Applications. Advanced Sustainable Systems . Art. No. 2200385. ISSN 2366-7486. doi:10.1002/adsu.202200385. (In Press)

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Herein, a facile "matrix-free" thin film membrane strategy is reported that exploits polymer brushes grafted hydroxyl-functionalized hexagonal boron nitride nanosheets (h-BNOH) toward forward osmosis desalination and dye rejection application. The functionalized nanosheets are characterized using Fourier transform infrared spectroscopy (FTIR), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Nuclear magnetic resonance (NMR), UV–visible spectrophotometry, and thermogravimetric analysis (TGA). Covalently functionalized nanosheets of poly methyl methacrylate (PMMA) termed as boron nitride grafted PMMA (BN-g-PMMA) obtained via RAFT polymerization are deployed toward “matrix-free” nanocomposite membranes. The membranes exhibit ≈ 5260 L/m⁻² h⁻¹ at a moderate pressure of 0.21 MPa in cross-flow mode and a 70% of flux retention ratio against bovine serum albumin as protein foulant. The matrix-free membranes exhibit ≈ 93% salt rejection for NaCl and > 99% rejection for MgCl₂ and Ca(NO₃)₂·4H₂O for 2000 ppm draw solution (water TDS benchmark for domestic purifiers) while 90% NaCl, and > 96% rejection for MgCl₂ and Ca(NO₃)₂·4H₂O for 5000 ppm draw. In simulated domestic water salinity, 97.8% rejection is observed for 2000 ppm and 94.5% for 5000 ppm draw solution, respectively. The matrix-free membranes also achieve almost 100% dye rejection for eight model dye pollutants at 1 ppm and > 96.6% for 10 ppm concentrations, respectively.

Item Type:Article
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URLURL TypeDescription
Samantaray, Paresh Kumar0000-0003-2533-929X
Sen Gupta, Ria0000-0003-4087-0476
Bose, Suryasarathi0000-0001-8043-9192
Additional Information:P.K.S. and R.S.G. contributed equally to this work. S.B.would like to extend acknowledgment to DST/SERB (Swarnajayanti fellowship) for funding, and R.S. would like to acknowledge MHRD for Prime Minister's Research Fellowship (PMRF). The authors would also like to thank NMR research Centre for the NMR facility and Prof. Satish Patil for the GPC experiments.
Funding AgencyGrant Number
Department of Science and Technology (India)UNSPECIFIED
Science and Engineering Research Board (SERB)UNSPECIFIED
Record Number:CaltechAUTHORS:20230123-451841300.42
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118904
Deposited By: Research Services Depository
Deposited On:16 Feb 2023 17:39
Last Modified:16 Feb 2023 17:39

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