Removal of Copper and Cobalt(II) Ions from Sewage Using Natural and Modified Bentonite: Kinetics Studies

IF 0.6 4区化学 Q4 CHEMISTRY, APPLIED

Russian Journal of Applied Chemistry Pub Date : 2025-05-13 DOI:10.1134/S1070427224120012

Nasseri Shahab, Mammadova Saadat, Jahangiri Jalal, Agayeva Zenfira

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Abstract

In the present study, the adsorption capacities of natural activated clay (bentonite) and Na-form of heat-treated bentonite for copper and cobalt ions from sewage at 20–65°C temperature range were examined and compared. The modification of the natural clay was performed by treatment with hydrochloric acid and subsequent neutralization of the resultant solution by sodium hydroxide. The morphology and structural properties of Natural and Na-form of heat-treated bentonite were investigated by XRD, SEM, and FTIR. The equilibrium adsorption capacity of both natural and Na-form heat-treated bentonite at various temperatures were determined samples. XRD showed, there is the montmorillonite in studied bentonite and modified bentonite samples. SEM analysis indicated the montmorillonite is formed in format of large and small bowls and leaf shape in 2 samples. The study showed that increasing the temperature results in the increase of the adsorption efficiency of the adsorbents because swelling and dehydration are reduced. Also, the adsorption efficiency of bentonite samples for the Cu²⁺ ions was greater than Co²⁺ ions in all the examined solution concentration and temperatures. Na modified bentonite had higher equilibrium distribution coefficient, gross capacity values, and metal ion adsorption selectivity.

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利用天然和改性膨润土去除污水中的铜和钴离子：动力学研究

研究比较了天然活性粘土（膨润土）和na型热处理膨润土在20 ~ 65℃温度范围内对污水中铜、钴离子的吸附能力。对天然粘土进行了改性，用盐酸处理，然后用氢氧化钠中和生成的溶液。采用XRD、SEM、FTIR等研究了天然型和na型热处理膨润土的形貌和结构特性。测定了天然膨润土和钠型热处理膨润土在不同温度下的平衡吸附量。XRD分析表明，膨润土和改性膨润土样品中均含有蒙脱土。SEM分析表明，2个样品中蒙脱土呈大碗状、小碗状和叶状。研究表明，温度升高，吸附剂的吸附效率提高，因为溶胀和脱水减少。在不同浓度和温度下，膨润土样品对Cu2+离子的吸附效率均大于Co2+离子。钠改性膨润土具有较高的平衡分配系数、总容量值和金属离子吸附选择性。

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来源期刊

Russian Journal of Applied Chemistry 化学-应用化学

CiteScore

1.60

自引率

11.10%

发文量

审稿时长

2-4 weeks

期刊介绍： Russian Journal of Applied Chemistry (Zhurnal prikladnoi khimii) was founded in 1928. It covers all application problems of modern chemistry, including the structure of inorganic and organic compounds, kinetics and mechanisms of chemical reactions, problems of chemical processes and apparatus, borderline problems of chemistry, and applied research.