期刊
DESALINATION
卷 419, 期 -, 页码 152-159出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.desal.2017.06.016
关键词
Modified polyaspartic acid scale inhibitors; Calcium sulfate scale; Differential absorbance spectroscopy; DFT calculation; Scale inhibition mechanism
资金
- National Natural Science Foundation of China [51608275]
- Natural Science Foundation of Jiangsu Province of China [BK20161480, BK20150981]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [15KJB610009]
- Priming Scientific Research Foundation for Advanced Talents of Nanjing Normal University [2014103XGQ0196]
- Research Innovation Program for College Graduates of Jiangsu Province [KYLX16_1294]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
Modified polyaspartic acid (PASP) scale inhibitors, Tyr-SA-PASP and Trp-SA-PASP, were prepared through grafting copolymerization on PASP with sulfamic/amino acids, and then applied for the inhibition of calcium sulfate from cooling water. Scale inhibition performance evaluation demonstrated Tyr-SA-PASP and Trp-SA-PASP were two cost-effective scale inhibitors for the inhibition of calcium sulfate: Compared to PASP and two commercial scale inhibitors (PAPEMP and JH-907), both modified PASP scale inhibitors exhibited higher inhibition performance, due to coordination between the deprotonation of carboxylic acid and phenolic hydroxyl groups of Tyr-SA-PASP and carboxylic acid groups of Trp-SA-PASP and Ca2+. Scale inhibition mechanism was investigated from microscopic viewpoints: coordination was the intrinsic driving force; Modified PASP scale inhibitors significantly damaged the crystalline structure of calcium sulfate scale, which resulted from coordination between functional groups on modified PASP scale inhibitors and Ca2+; The scale inhibition ability of modified PASP scale inhibitors came from the prevention of the growth of crystal planes ({040}, {041} and {113}). The current study provided a strategy for the design of scale inhibitors from the viewpoint of chemical structures.
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