Fluorescent polyaspartic acid with an enhanced inhibition performance against calcium phosphate

Fluorescent polyaspartic acid with an enhanced inhibition performance against calcium phosphate

Fluorescent polyaspartic acid (FPASP) used as a novel scale inhibitor was synthesized with partially ethanolamine-modified polysuccinimide, p-toluenesulfonyl chloride and 3-amino-9-ethyl carbazole. The products were characterized by 1H NMR, gel permeation chromatography and fluorescent spectra, resp...

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Bibliographic Details
Published in:Desalination Vol. 345; pp. 72 - 76
Main Authors: Feng, Jiuying, Gao, Lijun, Wen, Rizhen, Deng, Yiyi, Wu, Xiaojun, Deng, Shulin
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 15-07-2014
Elsevier
Subjects:
Applied sciences
Calcium phosphate
Carbazoles
Chlorides
Dosing
Exact sciences and technology
Fluorescence
Inhibition
Inhibitors
Pollution
Polyaspartic acid
Scale inhibitor
Spectra
Fluorescence
Calcium phosphate
Scale inhibitor
Polyaspartic acid
In situ
Hydroxyl group
Fluorescence spectrometry
Gel permeation chromatography
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Summary:Fluorescent polyaspartic acid (FPASP) used as a novel scale inhibitor was synthesized with partially ethanolamine-modified polysuccinimide, p-toluenesulfonyl chloride and 3-amino-9-ethyl carbazole. The products were characterized by 1H NMR, gel permeation chromatography and fluorescent spectra, respectively. The results show that carbazole groups, the fluorescent chromophore, were successfully incorporated into PASP. The relationship between the fluorescence intensity and the concentration of FPASP is linear. This provides a prerequisite for an automatic dosing of PASP by determining the concentration in situ using a fluorescence spectrometer with the help of computer technology. In addition, when the concentration was 12mgL−1, the inhibition efficiency of Ca3(PO4)2 was improved from 31.3% of PASP to 93.3% of FPASP, which were determined using the static scale inhibition method. This improvement originates from the hydroxyl groups introduced into PASP. [Display omitted] •A fluorescent polyaspartic acid scale inhibitor is synthesized.•The fluorescence intensity is linearly related to the inhibitor concentration.•The inhibitor concentration can be monitored conveniently and accurately.•The inhibitor greatly improves calcium phosphate inhibition performance.
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ISSN:0011-9164
1873-4464
DOI:10.1016/j.desal.2014.04.019