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Journal of Chinese Society for Corrosion and protection  2025, Vol. 45 Issue (3): 812-820    DOI: 10.11902/1005.4537.2024.167
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Design and Performance of Acrylic Acid-motherwort Dregs Composite Carbon Dots for Fluorescent Scale Inhibitor
ZHANG Hongjiang1(), CHEN Jiaqi2, XIE Weiwei2, LIU Zhongxuan2, DONG Sheying2
1.North China Electric Power Research Institute Co., Ltd., Beijing 100045, China
2.School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an 710311, China
Cite this article: 

ZHANG Hongjiang, CHEN Jiaqi, XIE Weiwei, LIU Zhongxuan, DONG Sheying. Design and Performance of Acrylic Acid-motherwort Dregs Composite Carbon Dots for Fluorescent Scale Inhibitor. Journal of Chinese Society for Corrosion and protection, 2025, 45(3): 812-820.

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Abstract  

In recent years, the fluorescence detection technology has become the main methods of on-line detection for scale inhibitors. Then, fluorescence-type scale inhibitors play a key role in the above inspection, and its research work is need urgently. Herein, novel composite carbon dots (AA-CDM) of acrylic acid-motherwort dregs, which was synthesized using a one-step hydrothermal method with motherwort dregs and acrylic acid as raw materials. Then, the rationality of AA-CDM synthesis process was confirmed by infrared spectrum and X-ray photoelectron spectroscopy. In the anti-scaling aspect, the results of scale inhibition test showed that the AA-CDM presents remarkably enhanced scale inhibition efficiency, which is attributed to the introduction of acrylic acid into the motherwort-dregs-based. The inhibition efficiency of AA-CDM in low concentration (5 mg·L-1) for CaSO4-type scale was close to 100%, and what is more, which may be retained above 95% origin level, even in 45 h after the first use. Besides, the relevant anti-scaling mechanism of AA-CDM was analyzed, the outcomes of XRD, XPS, and ultraviolet differential spectroscopy exhibit that AA-CDM has the chelating solubilization ability, which can inhibit the normal growth of CaSO4 scale. Meanwhile, the fluorescence intensity of AA-CDM showed a linear correlation with its concentration (R2 = 0.999), and the material presents has also good in thermal stability of fluorescence. Overall, the AA-CDM is suitable for most circulating water systems, and remains design method to get a novel fluorescent scale inhibitor.

Key words:  acrylic acid      motherwort dregs      composite carbon dots      fluorescent scale inhibitor design      scale inhibition performance      mechanism of inhibition     
Received:  28 May 2024      32134.14.1005.4537.2024.167
ZTFLH:  X703  
Fund: North China Electric Power Research Institute of Chemistry and Environmental Protection(20230744)
Corresponding Authors:  ZHANG Hongjiang, E-mail: 416228638@qq.com

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2024.167     OR     https://www.jcscp.org/EN/Y2025/V45/I3/812

Fig.1  IR spectra of as-prepared CDs (a), XPS spectra of C 1s of CDM and AA-CDM at high resolution TEM images (b), and TEM images of CDM (c) and AA-CDM (d)
Fig.2  Effect of AA-CDM concentration on its fluorescence emission spectrum
Fig.3  Impact of testing temperature on the fluore-scence emission spectrum of AA-CDM (a), and thermogravimetric analysis (TGA) curve of AA-CDM (b)
Fig.4  Contrast histogram of scale inhibition performances for different materials
Fig.5  Effects of temperature (a), time (b), and pH value (c) on the efficiency of AA-CDM for inhibiting CaSO4 scale and influence of AA-CDM content on its efficiency for inhibiting CaCO3 scale (d)
Fig.6  Comparison of inhibition efficiencies of AA-CDM and other kinds of inhibitors[12,21~27]
Fig.7  SEM images of CaSO4 without (a) and with (b) addition of 3 mg·L-1 AA-CDM, and XRD patterns of CaSO4 after additions of (0, 1, 3) mg·L-1 AA-CDM (c)
Fig.8  Differential ultraviolet spectroscopy (a) and high-resolution XPS spectra of O 1s (b) and N 1s (c)
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