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新型荧光标记阻垢剂存在下反渗透海水淡化过程中碳酸钙结晶的案例研究

A Case Study of Calcium Carbonate Crystallization during Reverse Osmosis Water Desalination in Presence of Novel Fluorescent-Tagged Antiscalants.

作者信息

Popov Konstantin, Oshchepkov Maxim, Pervov Alexei, Golovesov Vladimir, Ryabova Anastasia, Trukhina Maria, Tkachenko Sergey

机构信息

JSC "Fine Chemicals R&D Centre", Krasnobogatyrskaya, Str. 42, b 1, 107258 Moscow, Russia.

Department of Chemistry and Technology of Biomedical Pharmaceuticals, Mendeleev University of Chemical Technology, 125047 Moscow, Russia.

出版信息

Membranes (Basel). 2022 Feb 6;12(2):194. doi: 10.3390/membranes12020194.

DOI:10.3390/membranes12020194
PMID:35207115
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8875236/
Abstract

Calcium carbonate scaling in reverse osmosis (RO) desalination process is studied in the presence of two novel fluorescent-tagged scale inhibitors 1,8-naphthalimide-tagged polyacrylate (PAA-F1) and 1-hydroxy-7-(6-methoxy-1,3-dioxo-1-benzo[de]isoquinolin-2()-yl)heptane-1,1-diyl-bis(phosphonic acid) (HEDP-F) by fluorescent microscopy (FM) and scanning electron microscopy (SEM). Both antiscalants diminished the mean size of calcite crystals relative to the blank experiment. The behavior and localization of HEDP-F and PAA-F1 during calcite scale formation on membrane surface was found to be significantly different from the distribution in similar RO experiments with gypsum, reported earlier. In the former case, both antiscalants are concentrated exactly on the surface of calcium carbonate crystals, while in the latter one they form their own phases (Ca-HEDP-F and Ca-PAA-F1) and are not detected on gypsum scale. The difference is interpreted in terms of interplay between background calcium concentration and sparingly soluble calcium salts' solubility. HEDP-F reveals slightly higher efficiency than PAA-F1 against calcite scale formation, while PAA-F exhibits a higher ability to change calcite morphology. It is demonstrated that there is a lack of correlation between antiscaling efficacy and ability of antiscalant to change calcium carbonate morphology in a particular case study. An application of fluorescent-tagged antiscalants in RO experiments provides a unique possibility to track the scale inhibitor molecules' localization during calcite scale formation. Fluorescent-tagged antiscalants are presumed to become a very powerful tool in membrane scaling inhibition studies.

摘要

通过荧光显微镜（FM）和扫描电子显微镜（SEM），研究了在两种新型荧光标记的阻垢剂1,8-萘二甲酰亚胺标记的聚丙烯酸酯（PAA-F1）和1-羟基-7-(6-甲氧基-1,3-二氧代-1-苯并[de]异喹啉-2()-基)庚烷-1,1-二基-双(膦酸)（HEDP-F）存在下，反渗透（RO）脱盐过程中的碳酸钙结垢情况。相对于空白实验，两种阻垢剂都减小了方解石晶体的平均尺寸。结果发现，HEDP-F和PAA-F1在膜表面方解石垢形成过程中的行为和定位与早期报道的类似RO石膏实验中的分布有显著不同。在前一种情况下，两种阻垢剂都恰好集中在碳酸钙晶体表面，而在后一种情况下，它们形成了自己的相（Ca-HEDP-F和Ca-PAA-F1），在石膏垢上未检测到它们。这种差异是根据背景钙浓度和微溶钙盐溶解度之间的相互作用来解释的。HEDP-F在防止方解石结垢方面的效率略高于PAA-F1，而PAA-F在改变方解石形态方面表现出更高的能力。在一个具体的案例研究中表明，阻垢效果与阻垢剂改变碳酸钙形态的能力之间缺乏相关性。在RO实验中应用荧光标记的阻垢剂提供了一种独特的可能性，即在方解石垢形成过程中追踪阻垢剂分子的定位。荧光标记的阻垢剂被认为将成为膜结垢抑制研究中一种非常强大的工具。

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