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Chinese Journal of Materials Research  2020, Vol. 34 Issue (10): 761-769    DOI: 10.11901/1005.3093.2020.058
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Carbon Dots Incorporated Polysulfone Nanocomposite Membranes with High Water Fux and Fouling Resistance
CHEN Bin1, ZHANG Jialu1, ZHANG Yan1, ZHAO Haichao2, ZHU Lijing2()
1. School of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
2. Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Cite this article: 

CHEN Bin, ZHANG Jialu, ZHANG Yan, ZHAO Haichao, ZHU Lijing. Carbon Dots Incorporated Polysulfone Nanocomposite Membranes with High Water Fux and Fouling Resistance. Chinese Journal of Materials Research, 2020, 34(10): 761-769.

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Abstract  

Carbon dots (CDs) were synthesized from 4-aminosalicylic acid (ASA) by a hydrothermal carbonization technique and then incorporated into the membrane casting solution. Then polysulfone/carbon dots (PSF/CDs) nanocomposite membranes were prepared by non-solvent induced phase separation. The results of transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR) show that CDs with a lot of hydrophilic groups had been successfully synthesized. Water contact angle analysis (WCA), scanning probe microscope (SPM) and scanning electron microscope (SEM) were used to characterize all membranes. It could be found that nanocomposite membranes have better hydrophilicity and water flux than the original membrane. Therefore, the anti-fouling performance of the modified membranes had also been improved. Flux recovery rate (FRR) of the fabricated PSF/CDs membrane is higher than 90%, total fouling ratio (Rt) is less than 60%, and the reversible fouling played a dominant role during the fouling process. When the CDs content (mass fraction) is 2%, the overall effect of the membrane is the best with comprehensive performances such as separation efficiency, separation effect, and antifouling ability etc. The water flux of the nanocomposite membranes with stronger anti-fouling ability is even 3 times that of the plain PSF membrane.

Key words:  organic polymer materials      polysulfone      carbon quantum dots      nanocomposite membrane      fouling resistance      hydrophilicity     
Received:  24 February 2020     
ZTFLH:  TQ028.5  
Fund: National Natural Science Foundation of China(51603214);Ningbo Science and Technology Bureau(2018A610110);“One Hundred Talented People”of the Chinese Academy of Sciences(Y60707WR04)

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2020.058     OR     https://www.cjmr.org/EN/Y2020/V34/I10/761

Fig.1  Schematic diagram of the preparation processes of CDs (a) and the particle motion during the NIPs (b)
Fig.2  TEM image of CDs and the photo pictures of the CDs solution in ethanol and the fluorescence image in 365 nm ultraviolet irradiation (a), FTIR spectra typical (b), particle size distribution of CDs (c) and typical XPS wide scans of ASA and CDs (d)
SampleAtomic concentration (%, mole fraction)
O 1sN 1sC 1s
ASA21.796.9571.26
CDs12.098.5877.34
Table 1  Atomic concentration of ASA and CDs
Fig.3  XPS high resolution survey scans of (a, b) C 1s, and (c, d) O 1s regions of ASA and CDs
Fig.4  Micro-FTIR spectra (a) and typical XPS wide scans of M0, M0.5, M5 (b) and images of different membranes (c)
SampleAtomic concentration (%, mole fraction)
O 1sN 1sC 1sS 2p
M015.64-81.123.24
M0.513.550.3883.642.43
M511.673.0584.261.02
Table 2  Atomic concentration of different membranes
Fig.5  SEM images of the membranes (a) M0, (b) M0.5, (c) M1, (d) M2, (e) M3 and (f) M5
SimpleM0M0.5M1M2M3M5
Average/nm9.4 ± 0.810.2 ± 0.913.6 ± 1.716.4 ± 2.420.1 ± 4.322.3 ± 8.8
Porosity/%68.9 ± 0.569.6 ± 0.770.9 ± 0.673.6 ± 0.675.0 ± 0.977.3 ± 1.0
Table 3  Pore diameter and the porosity of the fabricated membranes
Fig.6  SPM images of the membranes (a) M0, (b) M0.5, (c) M1, (d) M2, (e) M3 and (f) M5
Fig.7  Cross-section SEM images of M0 (a), M1 (b), M2 (c) and M5 (d)
Fig.8  Water contact angles of the different membranes
Fig.9  The fluxes of FW1, FBSA, FW2 (a), BSA rejection and FRR of the fabricated membranes (b), total fouling ratio (Rt), reversible fouling ratios (Rr) and irreversible fouling ratios (Rir) (c), the percentage of reversible (Rr/Rt) and irreversible fouling (Rir/Rt) in total fouling of the di?erent membranes (d)
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