| 马玉聪,樊保民,郝华,吕金玉,杨彪,冯云皓.肉桂醛超分子缓蚀剂对冷凝水中铁含量的净化机理[J].材料导报,2018,32(20):3660-3666 |
| 肉桂醛超分子缓蚀剂对冷凝水中铁含量的净化机理 |
| Removal Mechanism of Total Iron Content in Condensate Water by a Supramolecular Assembly Based on trans-Cinnamaldehyde and β-Cyclodextrin |
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| DOI：10.11896/j.issn.1005-023X.2018.20.029 |
| 中文关键词: 分子识别与自组装 蒸汽冷凝水 全铁含量 分子动力学模拟 |
| 英文关键词: molecular recognition and self-assembly, condensate water, total iron content, molecular dynamics simulation |
| 基金项目:国家自然科学基金(21606005;51473007);北京市教委科技计划一般项目(SQKM201710011001) |
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| 中文摘要: |
| 减轻蒸汽冷凝水对输运管线的腐蚀有利于实现其净化并含能直接回用。本研究通过饱和溶液法制备以β-环糊精(β-CyD)为主体,肉桂醛(CA)为客体的超分子缓蚀剂(CDCA)。核磁共振氢谱结果显示CA可从β-CyD的宽端口或窄端口进入疏水空腔,从宽端口组装的产物总能量低；相溶解度曲线表明CDCA中主、客体的组装计量比为1∶1,结合常数达786 mol-1。将CDCA引入冷凝水回收系统可降低水体的全铁含量；现场监测显示,加入CDCA后,冷凝水中的全铁含量显著降低并维持在50~70 μg·L-1。动态失重结果表明CDCA可有效抑制碳钢在冷凝水中的腐蚀,并阻滞腐蚀产物向水体扩散,当温度为298 K,CDCA的添加浓度为150 mg·L-1时,碳钢在水体中的缓蚀率达94.1%。动电位极化结果表明CDCA能同时抑制碳钢在冷凝水中阴、阳极的腐蚀过程,属于阳极抑制为主的混合型缓蚀剂。电化学阻抗谱与线性极化电阻的结果均表明CDCA可显著增大碳钢在冷凝水中腐蚀的极化电阻。表面分析显示经CDCA处理后的碳钢试样仅检测到客体CA的价键信息,因此可推断仅CA在金属表面吸附成膜。理论模拟验证了该推论并指明CA以平行取向吸附于碳钢表面。 |
| 英文摘要: |
| Mitigating the corrosion tendency of condensate water towards pipeline steel favors its direct reuse. A surpramole-cular assembly (CDCA) was prepared through saturated solution method based on β-cyclodextrin (β-CyD, host) and trans-cinnamaldehyde (CA, guest). The results of proton nuclear magnetic resonance spectra indicated that CA could assemble with β-CyD via the wide or narrow rim of hydrophobic cavity, in which the wide rim assembled was energy preferred. Phase solubility study showed that the ratio of host to guest was 1∶1 in CDCA owning an association constant of 786 mol-1. The total iron content of condensate water in the field test could be effectively inhibited after adding CDCA, which could be maintained ranging from 50 to 70 μg·L-1. Dyna-mic weight loss measurements indicated CDCA could efficiently alleviate the corrosion of mild steel in the condensate water, and thus retard the permeation of corrosion product into the bulk water; the inhibition efficiency could reach 94.1% in the presence of 150 mg·L-1 CDCA at 298 K. Potentiodynamic polarization curves showed that CDCA inhibited the cathodic and anodic processes simultaneously, which could categorized as an anodic-dominated mix type corrosion inhibitor. Both the results of electrochemical impedance spectroscopy and linear polarization measurements revealed the polarization resistance could be enhanced in the presence of CDCA. Surface analyses disclosed only guest molecules (CA) adsorbed on the steel surface, which was verified by molecular dynamics simulation. Quantum chemistry calculations supported that CA adsorbed parallelly on the steel surface. |
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