Acid mine drainage (AMD) is a persistent and challenging environmental pollution problem. The consequences of AMD include soil pollution, biodiversity loss, and ecosystem collapse. Our study found that rhodamine B acylhydrazone (RBA) exhibits high sensitivity to Fe3+ and can be used as a corrosion inhibitor. This finding led us to hypothesize that the application of RBA is an effective strategy for constructing self-warning and self-healing integrated pH-responsive mercaptopropyl trimethoxysilane (PeopS-SH) coatings. We herein successfully prepared RBA-loaded mesoporous silica nanoparticles (MSN@RBA) designed to exhibit localized, acid-responsive behavior to avoid oxidation site diffusion and enhance wound healing. These MSN@RBA were sensitive to acidic environments, triggering the rapid release of RBA. The experiments showed that MSN@RBA effectively inhibited the oxidation rate of pyrite and enhanced the long-term passivation effect of the coating. Our findings further demonstrated that MSN@RBA reduced the corrosion current density (0.17 μA cm−2), increased the corrosion potential (335 mV), and improved the thickness and density of the coating. The results of release experiments, electrochemical tests and chemical leaching indicate that MSN@RBA releases RBA in acidic environments, and its spironolactam structure opens and forms a complex with Fe3+. The damaged site is fluorescently labeled and repaired. In conclusion, this acid-responsive nanoparticle system presents a new strategy for the treatment of tailings in harsh environments for a long time.
Hydrogen bond networks (HBNs) have piqued the interest of the scientific community due to their crucial roles in nature. However, HBNs that are isolated from complicated backgrounds for unraveling their characteristics are still scarce. Herein, we propose that HBNs exist in complex anions formed between α-cyclodextrin (α-CD) and four benzoic acids (RBAs) in the gas phase. The complex anions are facilely extracted from solutions via the electrospray ionization technique, and subsequently activated through collision for the investigation of their transition dynamics. It is revealed that the generation of deprotonated α-CD and neutral RBAs is the unexpected dominant dissociation pathway for all the four complex anions, and the complex anions formed from more acidic RBAs exhibit higher stabilities. These dissociation results are successfully explained by the cooperative stretching dynamics of the proposed HBNs that are formed involving the intramolecular HBN of α-CD and the intermolecular hydrogen bonds (HBs) between α-CD and RBAs. Furthermore, the rarely observed low barrier HBs (LBHBs) are suggested to be present in the HBNs. It is believed that the present complex anions can serve as a facilely accessible and informative model for studying HBNs in the future.
危险品化学品经营许可证（带存储）