酸浓度对废铝刨花化学沉淀法合成纳米氧化铝的影响

Babatunde Oji , Sunday G. Borisade , Seun S. Owoeye
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引用次数: 0

摘要

近年来,通过回收和使用废物,努力采取可持续的做法和保护环境。为此,本研究探讨了利用化学沉淀法从废铝刨花(Alsc)中合成纳米氧化铝的可能性。废铝最初是从铝型材加工车间的排土场中获得的。取适量Alsc粉与不同浓度的3、4、5、6 M盐酸(HCl)在120 ℃下反应2 h,制得AlCl3溶液。在得到的AlCl3滤液中加入4 M NaOH后,可析出氧化铝纳米颗粒(AlNPs)。沉淀的AlNPs经过24 h的时效,干燥,然后在600 ℃下煅烧,得到纯氧化铝(Al2O3)粉末。然后表征了AlNPs的相、形态、官能团、粒度和氧化铝产率。结果表明:合成的AlNPs为高无定形氧化铝(γ-Al2O3),随着HCl浓度的增加,形貌呈现颗粒团聚增加的趋势。透射电镜显示,3、4、5和6 M HCl的粒径范围分别为7.22 ~ 14.40 nm、5.53 ~ 5.54 nm、15.20 ~ 17.30 nm和15.20 ~ 17.30 nm。定量分析表明,随着酸浓度的增加,氧化铝纯度增加,3、4、5和6 M HCl的纯度分别为76.9、84.5、85.2和88.7 wt%,而其他成分的痕量也很明显。这项研究强调了将铝废料转化为可持续应用的高价值材料的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of acid concentration on the synthesis of alumina nanoparticles from waste aluminum shavings using chemical precipitation technique
In recent times, efforts have been tailored towards sustainable practices and environmental preservation through recycling and use of waste materials. In this regards, this study explores the possibility of synthesizing alumina nanoparticles from waste aluminum shavings (Alsc) using chemical precipitation method. Waste Alsc were initially obtained from aluminum profiles machining workshops dump. Appropriate amount of Alsc powder was reacted with varying concentrations of 3, 4, 5 and 6 M hydrochloric acid (HCl), respectively at 120 °C for 2 h to obtained AlCl3 solution. Alumina nanoparticles (AlNPs) were precipitated following the addition of 4 M NaOH to each AlCl3 filtrate obtained. The precipitated AlNPs were aged for 24 h followed by drying, then calcined at 600 °C to obtain pure alumina (Al2O3) powder. The AlNPs were then characterized for their phase, morphology, functional group, particle size, and alumina yield. The results showed the synthetized AlNPs are highly amorphous alumina (γ-Al2O3) while the morphology showed particle agglomeration increase with increased HCl concentration. TEM showed the particle size ranged within 7.22–14.40 nm, 5.53–5.54 nm, 15.20–17.30 nm, and 15.20–17.30 nm for 3, 4, 5 and 6 M HCl respectively. The quantitative analysis showed alumina purity increase at increasing acid concentration with value ranged from 76.9, 84.5, 85.2, and 88.7 wt% for 3, 4, 5 and 6 M HCl, respectively, while trace amounts of other constituents are noticeable. This research highlights the potential of converting aluminum waste into high-value materials for sustainable applications.
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