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首页> 外文期刊>RSC Advances >Facile and low-cost synthesis of pure hematite (alpha-Fe2O3) nanoparticles from naturally occurring laterites and their superior adsorption capability towards acid-dyes
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Facile and low-cost synthesis of pure hematite (alpha-Fe2O3) nanoparticles from naturally occurring laterites and their superior adsorption capability towards acid-dyes

机译：纯赤铁矿（α-Fe2O3）纳米粒子的容易和低成本合成从天然存在的外侧，它们对酸性染料的优异吸附能力

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摘要

Hematite nanoparticles have a broad range of outstanding applications such as in wastewater treatment, electrolytic studies, and photoelectrochemical and superparamagnetic applications. Therefore, the development of facile and novel methods to synthesize hematite nanoparticles using low-cost raw materials is an important and timely requirement. In this study, we have developed a facile economical route to synthesize hematite nanoparticles, directly from the naturally occurring material laterite. Laterite is a rock that is rich in Fe and Al with extensive distribution in large mineable quantities in many countries around the world, though not yet utilized for major industrial applications. In this method, ferric ions in the laterite were leached out using acid and the solution obtained was hydrolyzed with slow-release hydroxyl ions which were acquired by aqueous decomposition of urea. The resulted precursor was calcined to obtain hematite nanoparticles. Characterization data shows that the final product is comprised of spherical hematite nanoparticles with a narrow particle size vs. frequency distribution with an average particle diameter of 35 nm. The synthesized product has a purity of over 98%. Furthermore, the synthesized nanoparticles show an excellent adsorption percentage as high as 70%, even when the initial dye concentration in water is 5000 ppm and the amount of material is minimal, towards acid dyes which are excessively used in textile based industries. Such acid dyes are a threat to the environment when they are released into water bodies by industries in massive quantities. Therefore synthesized hematite nanoparticles are ideal to treat dye wastewater in industrial effluents because such nanoparticles are low cost and economical, and the synthesis procedure is rather facile and effective.
机译：赤铁矿纳米粒子具有广泛的卓越应用，如废水处理，电解研究和光电化学和超顺磁性应用。因此，使用低成本原料合成赤铁矿纳米颗粒的容易和新方法的发展是一个重要的和及时的要求。在这项研究中，我们开发了一种容易经济的途径来合成赤铁矿纳米颗粒，直接从天然存在的物质后面。 Widerite是一个富含Fe和AL的岩石，在世界各国许多国家的大量可弥赛力量广泛分配，但尚未用于主要的工业应用。在该方法中，使用酸浸出红外的铁离子，并通过尿素的水分分解获得的缓释羟基离子水解溶液。煅烧所得的前体以获得赤铁矿纳米颗粒。表征数据表明，最终产物由球形赤铁矿纳米颗粒组成，粒径与频率分布的窄粒径为35nm。合成产物的纯度超过98％。此外，合成的纳米颗粒显示出优异的吸附百分比高达70％，甚至当在水中的初始染料浓度为5000ppm和材料的量是最小的，朝向过度在基于织物工业中使用的酸性染料。这种酸性染料是对环境的威胁，当它们以巨大量的行业释放到水体中。因此，合成的赤铁矿纳米粒子是治疗工业废水中的染料废水，因为这种纳米颗粒是低成本和经济的，并且合成程序相当容易和有效。

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