Adsorption behaviour and mechanism of natural citric acid modified MOF-808 for Cr(III) and Cr(III)-EDTA in water and site energy analysis.

IF 2.2 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Environmental Technology Pub Date : 2025-06-01 Epub Date: 2024-12-31 DOI:10.1080/09593330.2024.2438890
Hao Zhang, Jiahong Wang, Peiling Han, Zhi Hu
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引用次数: 0

Abstract

Industrial wastewater often contains potentially toxic metals and it's chelates, posing serious threats to human health and aquatic ecosystems, and adsorption is frequently used for the minimization of potentially toxic metals from water. In this study, citric acid modified MOF-808 (MOF-808-CA) was prepared by using citric acid to modify MOF-808 for the removal of Cr(III) and Cr(III)-EDTA from wastewater. MOF-808-CA with the BET surface area of 653.59 m2 g-1 and the pore volumes of 0.467 cm3 g-1 was successfully synthesized. The adsorption of Cr(III) and Cr(III)-EDTA by MOF-808-CA was 40.46 and 17.03 mg g-1 at pH 4.0 and 25°C, respectively. The adsorption isotherms and adsorption kinetics of Cr(III) and Cr(III)-EDTA were summarized using Langmuir-Freundlich isothermal adsorption model and the pseudo-second-order model. Even in high salinity wastewater (35,000 mg L-1), MOF-808-CA displayed a strong affinity for Cr(III) and Cr(III)-EDTA. The site energy (E*) values reduced with the increasing of adsorption capacities, and Cr(III) and Cr(III)-EDTA firstly dominated the high-energy adsorption sites before low-energy adsorption sites. The average site energies for the adsorption of Cr(III) and Cr(III)-EDTA by MOF-808-CA were 26.7 and 24 kJ mol-1, respectively, and the differences in the average site energies further illustrated the essential differences in their adsorption mechanisms. The adsorption by electrostatic adsorption and surface complexation were the main adsorption mechanisms for Cr(III) on MOF-808-CA, whereas hydrogen bonding and complexation were the main adsorption mechanisms for Cr(III)-EDTA on MOF-808-CA. The results showed that the MOF-808-CA adsorbent has a great potential for the removal of both Cr(III) and Cr(III)-EDTA from aqueous solutions.

天然柠檬酸改性MOF-808对水中Cr(III)和Cr(III)-EDTA的吸附行为、机理及现场能分析
工业废水中往往含有潜在有毒金属及其螯合物,对人类健康和水生生态系统构成严重威胁,吸附法经常用于最大限度地减少水中潜在有毒金属。本研究采用柠檬酸对MOF-808进行改性,制备了柠檬酸改性MOF-808 (MOF-808- ca),用于去除废水中的Cr(III)和Cr(III)-EDTA。成功合成了MOF-808-CA,其BET表面积为653.59 m2 g-1,孔体积为0.467 cm3 g-1。在pH 4.0和25℃条件下,MOF-808-CA对Cr(III)和Cr(III)-EDTA的吸附量分别为40.46和17.03 mg g-1。采用Langmuir-Freundlich等温吸附模型和拟二阶吸附模型对Cr(III)和Cr(III)-EDTA的吸附等温线和吸附动力学进行了总结。即使在高盐度废水(35000 mg L-1)中,MOF-808-CA对Cr(III)和Cr(III)-EDTA也表现出较强的亲和力。位点能(E*)值随着吸附容量的增加而降低,Cr(III)和Cr(III)-EDTA首先占高能量吸附位点的主导地位,然后才是低能吸附位点。MOF-808-CA吸附Cr(III)和Cr(III)-EDTA的平均位能分别为26.7和24 kJ mol-1,平均位能的差异进一步说明了它们吸附机理的本质差异。静电吸附和表面络合是MOF-808-CA对Cr(III)的主要吸附机理,氢键和络合是MOF-808-CA对Cr(III)-EDTA的主要吸附机理。结果表明,MOF-808-CA吸附剂对Cr(III)和Cr(III)-EDTA均有较好的去除效果。
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来源期刊
Environmental Technology
Environmental Technology 环境科学-环境科学
CiteScore
6.50
自引率
3.60%
发文量
0
审稿时长
4 months
期刊介绍: Environmental Technology is a leading journal for the rapid publication of science and technology papers on a wide range of topics in applied environmental studies, from environmental engineering to environmental biotechnology, the circular economy, municipal and industrial wastewater management, drinking-water treatment, air- and water-pollution control, solid-waste management, industrial hygiene and associated technologies. Environmental Technology is intended to provide rapid publication of new developments in environmental technology. The journal has an international readership with a broad scientific base. Contributions will be accepted from scientists and engineers in industry, government and universities. Accepted manuscripts are generally published within four months. Please note that Environmental Technology does not publish any review papers unless for a specified special issue which is decided by the Editor. Please do submit your review papers to our sister journal Environmental Technology Reviews at http://www.tandfonline.com/toc/tetr20/current
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阿拉丁
Zirconium chloride octahydrate
阿拉丁
Homobenzoic acid
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