Dandan Shao,Gaofei Wei,Fu Zhang,Shuduan Deng,Xianghong Li
Aluminum plays important roles in infrastructure construction, aerospace, transportation, and industries for its excellent performance. Hence, exploring green aluminum corrosion inhibitors with high efficiency is becoming a research hot spot. In this study, the invasive weed of Alternanthera philoxeroides which seriously threatens the ecological environment was designed as a precursor to prepare Alternanthera philoxeroides extract (APE) as a plant corrosion inhibitor via ultrasonic extraction . The weight loss method and electrochemical measurement were used to study the inhibition effect of APE on aluminum in hydrochloric acid . The results showed that the maximum inhibition efficiency of APE is up to 96 % in 1.0 M HCl solution at 20 °C. Besides, it further proved that the physical and chemical adsorption worked simultaneously, and the APE acted as a mix-type inhibitor to improve good inhibition efficiency to the Al via the geometric coverage effect. A series of characterization and theoretical analyses confirmed that APE molecules exhibit high inhibiting efficiency to aluminum corrosion in HCl solution by laying horizontally and forming an adsorption film on the surface of the aluminum. The outcomes of this study may offer valuable insights into the treatment of invasive plants for their high-value utilization.
Yan Wang,Hongwei Yu,Chao Chen,Yuntao Xiong,Jie Wang,Yi Wang
Soil contamination by heavy metals is widespread as an inevitable consequence of every-increasing industrial and mining activities. In contaminated habitats, many sensitive plant species may extinct, and a few species, specifically the invasive plants with higher metal tolerance, can survive or colonize in such empty niche. The accumulation of heavy metals in plant tissues is one of the defense strategies against pathogens and herbivores. However, little is known regarding whether increased metal content is beneficial to the defense of invasive plants when competing with native plants. In this study, we explored the foliar chemistry of invasive alligator weed, Alternanthera philoxeroides , and its native congener sessile joyweed, A. sessilis , in response to cadmium (Cd) stress, and further examined how Cd amendment affected the performance and host selection of common cutworm Spodoptera litura (generalist), and alligator weed flea beetle Agasicles hygrophila (specialist). We found that the overall defense ability of invasive A. philoxeroides was higher than its native congener, but the defense mechanisms against specialist and generalist herbivores differed under Cd stress. Agasicles hygrophila was susceptible to high Cd stress, and the Cd amendment caused the beetle to shift hosts from A. philoxeroides to A. sessilis . For S. litura , organic rather than inorganic elemental defenses reduced its fitness on invasive plant, and the larvae prefer native plant against invasive plant in most scenarios. Native plant will be more vulnerable to herbivores when competing with invasive plant, especially in metal-polluted habitats. Our study provides a richer view of invasive mechanism in natural systems and appeals for paying more attention to soil contamination in assessing the potential ecological risk of plant invasion.
危险品化学品经营许可证（带存储）