饶博, 邹文杰, 赵伟, 余可馨. 低浓度聚丙烯酰胺的快速检测及溶液离子的影响研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.06.13.002
引用本文: 饶博, 邹文杰, 赵伟, 余可馨. 低浓度聚丙烯酰胺的快速检测及溶液离子的影响研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.06.13.002
Rapid Detection of low Concentration Polyacrylamide and study on the Influence of Ions in solution[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.06.13.002
Citation: Rapid Detection of low Concentration Polyacrylamide and study on the Influence of Ions in solution[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.06.13.002

低浓度聚丙烯酰胺的快速检测及溶液离子的影响研究

Rapid Detection of low Concentration Polyacrylamide and study on the Influence of Ions in solution

  • 摘要: 处理后选矿废水中残余的聚丙烯酰胺(PAM)影响回水水质及其回用,本文探索了一种低检出限的低浓度PAM快速检测方法,在190~300 nm波长范围内建立了4种类型及分子量不同PAM的紫外吸收光谱,研究了不同浓度K+和Ca2+对PAM浓度检测的影响,并通过原子力显微镜(AFM)分析了PAM分子构象的变化。结果表明,4种PAM峰值吸光度均在波长194 nm处测得,检出限均低于0.1 mg.L-1,PAM浓度与吸光度之间具有强线性关系(R2 >0.98)。随着K+和Ca2+浓度的增加,PAM溶液吸光度特征峰的强度逐渐降低,最大吸收波长不断红移,K+与Ca2+浓度分别超过50 mmol.L-1与5 mmol.L-1时,吸光度特征峰强度降速减缓。在去离子水中,分别沉积在二氧化硅和金基底的APAM-3与CPAM-12的表面形貌粗糙度(Rq)分别为24.3 nm和38.1 nm;K+和Ca2+浓度分别从10 mmol.L-1、1 mmol.L-1增加到100 mmol.L-1、10 mmol.L-1时,Rq分别从80.4 nm、120 nm增加到124 nm、145 nm,表明PAM链在溶液中的构象逐渐变卷曲,使紫外光谱特征吸收峰的峰值降低。同时,10、100 mmol.L-1 K+与1、10 mmol.L-1 Ca2+对PAM构象变化的影响程度基本相同。

     

    Abstract: The residual polyacrylamide (PAM) in the treated mineral processing wastewater affects the quality of the return water and its reuse. In this work, a rapid detection method with low detection limit and low concentration of PAM was developed. The ultraviolet absorption spectra of four PAM types with different molecular weights were established in the wavelength range of 190~300 nm. The effects of different concentrations of K+ and Ca2+ on the determination of PAM concentration were studied. The conformation of PAM molecules was analyzed using atomic force microscopy (AFM). Results indicated that the highest absorbance was recorded at 194 nm for four polymers. The detection limit was lower than 0.1 mg.L-1. There was a strong linear relationship between PAM concentration and absorbance (R2 >0.98). With the increase of the concentration of K+ and Ca2+, the intensity of the absorbance characteristic peak of PAM solution gradually decreased. The maximum absorption wavelength continuously redshifted. Moreover, the concentration of K+ and Ca2+ exceeded 50 mmol.L-1 and 5 mmol.L-1, the intensity of the absorbance characteristic peak slowed down. The surface roughness (Rq) of APAM-3 and CPAM-12 deposited on sio2 and Au substrates in deionized water is 24.3 nm and 38.1 nm. When the concentrations of K+ and Ca2+ increased from 10 mmol.L-1 and 1 mmol.L-1 to 100 mmol.L-1 and 10 mmol.L-1, Rq increased from 80.4 nm and 120 nm to 124 nm and 145 nm. Results indicating that the conformation of PAM chains gradually became coiled in solution. The peak value of the absorption peak of ultraviolet spectral features was reduced. At the same time,10 and 100 mmol.L-1 K+ and 1 and 10 mmol.L-1 Ca2+ had the same effect on the conformational change of PAM.

     

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