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首页> 外文期刊>Journal of Applied Polymer Science >Preparation of modified oligochitosan and evaluation of its scale inhibition and fluorescence properties
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Preparation of modified oligochitosan and evaluation of its scale inhibition and fluorescence properties

机译：改性低聚壳聚糖的制备及其阻垢和荧光性能评价

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摘要

To obtain an environmentally friendly and efficient scale inhibitor, carboxymethyl quaternary ammonium oligochitosan (CM-QAOC) was prepared from chitosan, which was depolymerized by nitrous acid, and then reacted with chloroacetic acid and glycidyl trimethyl ammonium chloride via carboxymethylation and quaternization, respectively. The chitosan derivatives were characterized by Fourier transform infrared and NMR spectroscopy. The inhibition performance for CM-QAOC was evaluated by a conductivity method and a static antiscaling test. The experiments demonstrated that CM-QAOC showed an excellent scale-inhibition performance. With a Ca2+ concentration of 240 mg/L, CM-QAOC at a concentration of 50 mg/L and pH 8.0 gave an antiscaling ratio of more than 98%. So, CM-QAOC could be applied as an excellent antiscaling agent. Furthermore, a detectable fluorescence of CM-QAOC solution was observed. To understand this interesting fluorescence phenomenon and to explore the probability of its being a fluorescent tracer, the relations between the fluorescence intensities and CM-QAOC concentrations and the pH influence on the fluorescence intensities were investigated. The results show the fluorescence intensities accorded well with the concentrations of CM-QAOC with a detection limit of 0.6046 mg/L, and the fluorescence intensity was constant within pH 5-9; this indicated that it had the potential of its being a fluorescent tracer. Thus, CM-QAOC could be applied as an antiscaling water-treatment chemical and as a fluorescence tracer directly without any further modifications. It could be self-traced online and in real time with its own fluorescence, although more work should be done to investigate its fluorescent mechanism and its tracing properties in detail. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42518.
机译：为了获得对环境友好，高效的阻垢剂，由壳聚糖制备了羧甲基季铵盐低聚壳聚糖（CM-QAOC），将其通过亚硝酸解聚，然后分别通过羧甲基化和季铵化与氯乙酸和缩水甘油基三甲基氯化铵反应。壳聚糖衍生物通过傅立叶变换红外光谱和核磁共振谱进行表征。通过导电性方法和静态防垢试验评价对CM-QAOC的抑制性能。实验表明，CM-QAOC表现出优异的阻垢性能。在Ca2 +浓度为240 mg / L的情况下，浓度为50 mg / L的CM-QAOC和pH值为8.0时，其防垢效果超过98％。因此，CM-QAOC可以用作优异的防垢剂。此外，观察到CM-QAOC溶液的可检测荧光。为了了解这种有趣的荧光现象并探索其成为荧光示踪剂的可能性，研究了荧光强度与CM-QAOC浓度之间的关系以及pH对荧光强度的影响。结果表明，荧光强度与CM-QAOC浓度相吻合，检出限为0.6046 mg / L，在pH 5-9范围内荧光强度恒定。这表明它具有成为荧光示踪剂的潜力。因此，CM-QAOC可以直接用作防垢水处理化学品和荧光示踪剂，而无需进行任何其他修改。尽管可以做更多的工作来详细研究其荧光机理及其追踪特性，但它可以在线实时地使用其自身的荧光进行自我追踪。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，42518。

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