Using Iron-Based Adsorbents for the Removal of Inorganic Ecotoxicants from Aquatic Systems

IF 0.5 4区 化学 Q4 CHEMISTRY, ANALYTICAL
S. A. Kobets, L. M. Demutskaya, G. M. Pshinko
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引用次数: 0

Abstract

The study investigates the adsorption of heavy metals (HMs), specifically Cd(II) and Co(II), from aqueous solutions using synthesized iron oxides with layered structures and surface groups of a basic nature: goethite α-FeO(OH), lepidocrocite γ-FeO(OH), and ferrihydrite Fe(OH)3. The results indicate that these crystalline materials are effective in adsorbing heavy metals within pH ranges typical of natural aquatic environments (7.5). We determined the conditions for extracting heavy metals, examining the effect of pH in aqueous solutions, ionic strength, adsorbent dosage, and major components of natural waters. The results show that the majority of HM ions are extracted within the first 30 min of contact between the aqueous solution and the solid phase of the adsorbents, with adsorption equilibrium being reached for iron-containing adsorbents in approximately 4 h. To account for the relative distribution of HM species in aqueous environments with varying pH values, we calculated the distribution of these species for the concentrations studied in model water solutions, enabling an evaluation of the extraction mechanism. The adsorption of Co(II) and Cd(II) is primarily driven by the interaction of their cationic forms with ferrinol surface groups of the studied iron-containing minerals through chemisorption from aqueous solutions within the investigated pH range. The adsorption limits for goethite and ferrihydrite are nearly identical, while those for lepidocrocite are significantly lower, which can be attributed to their structure and the availability of active adsorption sites. The shape of the adsorption isotherm curves is also quite similar across the entire concentration range. Based on the data obtained regarding the adsorption efficiency of Cd(II) and Co(II), which are among the most challenging cations to remove using adsorption methods, the synthesized goethite and ferrihydrite can be recommended as cost-effective and efficient materials for the purification of natural waters contaminated with heavy metals.

Abstract Image

使用铁基吸附剂去除水生系统中的无机生态毒物
本研究利用具有层状结构和碱性表面基团的合成铁氧化物(鹅膏石 α-FeO(OH)、鳞片铁氧化物 γ-FeO(OH)和铁水铁氧化物 Fe(OH)3)对水溶液中的重金属(HMs)(特别是镉(II)和钴(II))进行了吸附。结果表明,这些晶体材料在自然水生环境的典型 pH 值范围(7.5)内可有效吸附重金属。我们确定了萃取重金属的条件,研究了水溶液的 pH 值、离子强度、吸附剂用量和天然水体主要成分的影响。结果表明,大部分 HM 离子在水溶液与吸附剂固相接触的最初 30 分钟内就被萃取出来,含铁吸附剂在大约 4 小时内达到吸附平衡。为了考虑 HM 物种在不同 pH 值的水环境中的相对分布,我们计算了所研究浓度的 HM 物种在模型水溶液中的分布,从而对萃取机理进行了评估。在所研究的 pH 值范围内,钴(II)和镉(II)的吸附主要是由它们的阳离子形式与所研究的含铁矿物的铁素醇表面基团通过化学吸附作用从水溶液中产生的。鹅铁矿和铁酸盐的吸附极限几乎相同,而鳞铁矿的吸附极限则明显较低,这可能与它们的结构和活性吸附位点的可用性有关。在整个浓度范围内,吸附等温线的形状也非常相似。镉(II)和钴(II)是最难用吸附方法去除的阳离子,根据所获得的有关这两种阳离子吸附效率的数据,可以建议将合成的网纹石和铁水石作为具有成本效益的高效材料,用于净化受重金属污染的天然水域。
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来源期刊
Journal of Water Chemistry and Technology
Journal of Water Chemistry and Technology CHEMISTRY, APPLIED-CHEMISTRY, ANALYTICAL
自引率
0.00%
发文量
51
审稿时长
>12 weeks
期刊介绍: Journal of Water Chemistry and Technology focuses on water and wastewater treatment, water pollution monitoring, water purification, and similar topics. The journal publishes original scientific theoretical and experimental articles in the following sections: new developments in the science of water; theoretical principles of water treatment and technology; physical chemistry of water treatment processes; analytical water chemistry; analysis of natural and waste waters; water treatment technology and demineralization of water; biological methods of water treatment; and also solicited critical reviews summarizing the latest findings. The journal welcomes manuscripts from all countries in the English or Ukrainian language. All manuscripts are peer-reviewed.
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