零价铁(ZVI)因其去除重金属的功效而被广泛研究,硝酸盐,和污染水中的氯化有机化合物。然而,由于快速钝化和选择性差,其有效性有限,这促使人们寻求替代解决方案,如使用铝合金。在这项研究中,五种不同铝合金的功效,即Al-Mg,Al-Fe,Al-Cu,Al-Ni,每个包含50质量%的Al,浓度为10g/L,使用铜进行评估,硝酸盐和三氯甲烷(TCM)作为模型污染物。结果表明,化学污染物立即与Al-Mg反应。相反,其余三种合金在表现出显着的反应性之前表现出24小时的延迟。值得注意的是,Al-Mg合金将硝酸盐仅还原为铵,表明硝酸盐还原为N2的偏好最低。相比之下,Al-Cu,Al-Ni,Al-Fe合金表现出3%的N2选择性,5%,19%,分别。铜的去除效率,硝酸盐和中药在24小时内达到99%,95%在48h内,48%在48h内,分别。值得注意的发现包括Al-Fe合金中的Fe浓度与N2选择性从9.3%增加到24.1%之间的相关性。这导致Fe浓度从10%增加到58%,尽管同时反应性降低。Al-Fe合金通过直接电子转移去除Cu2+,而合金水解产生的原子氢促进了硝酸盐和TCM的去除。有趣的是,硝酸盐和中药抑制了Cu2+的还原,而Cu2+改善了硝酸盐还原和中药降解。这些发现证明了Al-Mg和Al-Fe合金作为水修复的高效试剂的巨大潜力。
Zero-valent iron (ZVI) has been extensively studied for its efficacy in removing heavy metals, nitrate, and chlorinated organic compounds from contaminated water. However, its limited effectiveness due to rapid passivation and poor selectivity is prompting for alternative solutions, such as the use of aluminium alloys. In this study, the efficacy of five distinct aluminium alloys, namely Al-Mg, Al-Fe, Al-Cu, and Al-Ni, each comprising 50 % Al by mass at a concentration of 10 g/L, was assessed using copper, nitrate and trichloromethane (TCM) as model contaminants. Results show that chemical pollutants reacted immediately with Al-Mg. On the contrary, the remaining three alloys exhibited a delay of 24 h before demonstrating significant reactivity. Remarkably, Al-Mg alloy reduced nitrate exclusively to ammonium, indicating minimal preference for nitrate reduction to N2. In contrast, the Al-Cu, Al-Ni, and Al-Fe alloys exhibited N2 selectivity of 3 %, 5 %, and 19 %, respectively. The removal efficiency of copper, nitrate and TCM reached 99 % within 24 h, 95 % within 48h and 48 % within 48h, respectively. Noteworthy findings included the correlation between Fe concentration within the Al-Fe alloy and an increased N2 selectivity from 9.3 % to 24.1 %. This resulted in an increase of Fe concentration from 10 % to 58 % albeit with a concurrent reduction in reactivity. Cu2+ removal by Al-Fe alloy occurred via direct electron transfer, while the removal of nitrate and TCM was facilitated by atomic hydrogen generated by the alloy\'s hydrolysis. Intriguingly, nitrate and TCM suppressed Cu2+ reduction, whereas Cu2+ improved nitrate reduction and TCM degradation. These findings demonstrate the great potential of Al-Mg and Al-Fe alloys as highly efficient agents for water remediation.