Azole derivatives embedded in montmorillonite clay nanocarriers as corrosion inhibitors of mild steel

Azole derivatives such as 2-mercaptobenzothiazole(MBT) and 2-mercaptobenzimidazole(MBI) were introduced as corrosion inhibitors into the interlayer space of sodium montmorillonite clay(Na+-MMT). The corrosion protection behavior of mild steel in solutions containing MBT, MBI, MMT + MBT, MMT + MBI, Na^+-MMT, and NaCl(3.5 wt%) was evaluated using polarization and electrochemical impedance spectroscopy(EIS). Also, the release of penetrated species into the medium from the clay nanocarriers was evaluated using ultraviolet-visible(UV-Vis) spectroscopy. Small-angle X-ray scattering(SAXS) confirmed the insertion of MBT and MBI into the inner space of the clay layers and the interaction between two organic and inorganic phases. Scanning electron microscopy(SEM) was used to assess the morphology of the surface of the steel samples after the samples had been immersed for 24 h in the extraction solution. The corrosion protection in the solutions with clay nanocarriers containing MBT and MBI was better than that in solutions without MMT. The UV-Vis results showed that the release of MBI species from Na+-MMT nanocarriers in neutral pH was far lower than that of MBT species.

氧化石墨烯/聚合物基复合膜对水, 氨水与二氯甲烷的渗透性

以氧化石墨烯(GO)、聚氨酯(PU)和亲水性聚2-丙烯酰胺-2-甲基丙烷磺酸(PAMPS)为原料,制备出无支撑的PU基复合膜和PAMPS基复合膜。研究氧化石墨烯聚合物基膜用于含极性材料废液如水、氨水、以及含非极性二氯甲烷和氨-二氯甲烷混合废液的渗透行为。采用不同表征方法如X射线衍射仪(XRD)、接触角、场发射扫描电子显微镜(FESEM)、红外光谱仪(FT-IR)和力学性能测试仪来评价所制复合膜的综合性能。采用ASTM E96/96-M14设备进行复合膜的渗透测试。结果表明,PAMPS基复合膜因较高的亲水性,具有最佳的水和氨渗透性能,而PU基复合膜具有最佳的二氯甲烷渗透性,最差的水和氨的渗透性。