Abstract
Polyaspartic acid (PASP)-based green scale inhibitor has great potential application in water treatment. Here, we first synthesized PASP in ionic liquid. Then, an effective PASP-based green scale inhibitor was synthesized by ring-opening graft modification of PASP with both aspartic acid (ASP) and monoethanolamine (MEA). Its chemical composition was characterized by gel chromatography (GPC), Fourier transform infrared spectroscopy (FTIR), and 1H nuclear magnetic resonance (1H NMR). Scale inhibition efficiency was measured by static scale inhibition tests. The results showed that the new PASP-based scale inhibitor has high scale inhibition to both CaCO3 and Ca3(PO4)2. When the concentration was increased to 2 mg/L, the inhibition efficiency of the new PASP-based scale inhibitor was 99% for CaCO3, while when the concentration was raised to only 4 mg/L, its inhibition efficiency increased to 100% for Ca3(PO4)2. Scanning electronic microscopy (SEM) and X-ray diffraction (XRD) were used to analyze the changes of crystal structure for CaCO3 and Ca3(PO4)2 after adding the new PASP-based scale inhibitor. The crystal size of CaCO3 and Ca3(PO4)2 became smaller and the crystal form became amorphous after adding the modified PASPs compared with adding pure PASP. Moreover, the modified PASP showed good biodegradation performance.
Highlights
In recent years, with the increase of worldwide population and expansion of modern society, the consumption and pollution of industrial water increases shortage of water resources significantly [1,2,3]
When the concentration was increased to 2 mg/L, the inhibition efficiency of the new PASP-based scale inhibitor was 99% for CaCO3, while when the concentration was raised to only 4 mg/L, its inhibition efficiency increased to 100% for Ca3 (PO4
Water treatment is an important technology to deal with the shortage of water resources [4,5,6]
Summary
With the increase of worldwide population and expansion of modern society, the consumption and pollution of industrial water increases shortage of water resources significantly [1,2,3]. Polyaspartic acid (PASP) is a promising environmentally friendly scale inhibitor with nontoxicity and good biodegradability It has excellent scale inhibiting performance for. It was shown that the modified PASP has better scaling inhibition to Ca et al synthesized. Xu et al obtained et al synthesized PASP/Urea by introducing an acylamino group into the side chains of ymer via polysuccinimide (PSI) ring-opening by melamine [22]. The ring-opening graft modification strategy was adopted to modify the synthesized with provide a carboxyl and hydroxyl group to PASP, respectively. The introduced both aspartic acid (ASP) and monoethanolamine (MEA).
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