Chromium sorption on synthetic and natural rock minerals with emphasis on speciation behavior and kinetic model using Cr51

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-04-23 DOI:10.1515/ract-2023-0240

Ashraf A. El-Sayed

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Abstract

The presence of chromate in the aquatic environment poses toxicity and pollution to the environment. Therefore, the needs to establish methods to get rid of this species is a must. The effect of different natural rock minerals; pyrite, magnetite, pyrrhotite, and wurtzite as constituent parts of the Earth’s crust can play a major role in waste treatment. The properties of those minerals towards the behavior of chromium (sorption) were studied under the effect of changes of pH and contact time to treat the waste solution of toxic chromate. The total chromium species in the reaction system was determined using Cr51 as a simpler, faster and more accurate analytical tools. Concerning the effect of types of minerals, the synthetic ones, the results indicated that pyrrhotite and wurtzite were highly effective for the removal of chromate with almost 100 % sorption capacity as it was pH-independent, despite the presence of a degree of reductive ability of both minerals. While, it was 99 % at pH 8.5 and 28 % at pH 3 for pyrite and magnetite, respectively, which was pH dependent. The equilibrium adsorption capacities for chromium adsorption were 0.34 ± 0.15, 0.028 ± 0.01 and 4.27 ± 1.3 mg/g mineral for natural minerals pyrite, magnetite and synthetic one pyrhotite, respectively. However, it was found 117.7 ± 10.9 mg/g for synthetic mineral wurtzite. These results can be attributed to the redox power of oxide and sulfide minerals; magnetite and, pyrite used. For kinetic studies of chromium (VI) adsorption, non linear model approved that the reaction could be described based on pseudo-second-order kinetics in such simulated environmental heterogeneous systems.

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铬在人工合成和天然岩石矿物上的吸附作用，重点是标本行为和使用 Cr51 的动力学模型

铬酸盐在水生环境中的存在会对环境造成毒性和污染。因此，必须找到去除铬酸盐的方法。作为地壳的组成部分，不同的天然岩石矿物（黄铁矿、磁铁矿、黄铁矿和钨铁矿）在废物处理中可以发挥重要作用。研究了这些矿物在 pH 值和接触时间变化的影响下处理有毒铬酸盐废液时的铬行为（吸附）特性。使用 Cr51 作为更简单、快速和准确的分析工具，测定了反应体系中的总铬种类。关于矿物类型（合成矿物）的影响，结果表明，尽管黄铁矿和乌云母具有一定程度的还原能力，但它们对铬酸盐的去除非常有效，吸附能力几乎达到 100%，且与 pH 值无关。而黄铁矿和磁铁矿的吸附容量在 pH 值为 8.5 时为 99%，在 pH 值为 3 时为 28%，这与 pH 值有关。天然矿物黄铁矿、磁铁矿和合成黄铁矿对铬的平衡吸附容量分别为 0.34 ± 0.15、0.028 ± 0.01 和 4.27 ± 1.3 毫克/克。然而，合成矿物乌云石的含量为 117.7 ± 10.9 毫克/克。这些结果可归因于所使用的氧化物和硫化物矿物（磁铁矿和黄铁矿）的氧化还原能力。在铬（VI）吸附的动力学研究中，非线性模型表明，在这种模拟环境异质系统中，反应可以根据假二阶动力学来描述。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.