Adsorption of Copper on Modified Galvanic Sludge

IF 0.5 4区化学 Q4 CHEMISTRY, ANALYTICAL

Journal of Water Chemistry and Technology Pub Date : 2024-06-06 DOI:10.3103/S1063455X24030068

R. E. Klishchenko, R. D. Chebotareva, V. Ya. Demchenko, S. V. Remez

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Abstract

The possibility of extracting Cu compounds through adsorption using galvanic sludge modified with solutions of humic acids was investigated. The chemical and structural composition of rigid galvanic sludge from printed circuit board production was examined. The primary phase-forming element is Fe compounds in the form of β-FeOOH, constituting up to 45% of the sludge mass. X-ray phase analysis of the sludge revealed the presence of two main phases: akaganeite (β-FeOOH) and an atacamite-like crystalline phase of copper hydroxychloride (Cu(OH)₃Cl) in quantities exceeding 10%. The conditions for leaching Cu compounds from the sludge and the effect of thermal treatment on the sludge adsorption capacity were determined. Copper was leached from galvanic sludge using an H₂SO₄ solution within the pH range of the equilibrium solution of 3–5.5. This allowed for the leaching of up to 97% of copper, with minimal dissolution of Fe compounds. The Cu concentration in the leaching solution reached 10–15 g/dm³, while the concentration of Fe ions did not exceed 1 mg/dm³, enabling the subsequent utilization of these solutions for Cu electroextraction. The modification of the sludge with humic acid solutions increases its adsorption capacity for copper ions by more than threefold.

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改良高尔文污泥对铜的吸附作用

研究了使用腐殖酸溶液改性的电镀污泥通过吸附萃取铜化合物的可能性。研究人员考察了印刷电路板生产过程中产生的硬质电镀污泥的化学和结构组成。主要的成相元素是以β-FeOOH形式存在的铁化合物，占污泥质量的45%。对污泥进行的 X 射线相分析表明，污泥中主要存在两种相：赤铁矿（β-FeOOH）和盐酸铜（Cu(OH)3Cl）的类金刚石结晶相，含量超过 10%。确定了从污泥中沥滤铜化合物的条件以及热处理对污泥吸附能力的影响。使用 H2SO4 溶液从电镀污泥中沥滤铜，平衡溶液的 pH 值范围为 3-5.5。这使得铜的浸出率高达 97%，而铁化合物的溶解度则降到最低。沥滤溶液中的铜浓度达到 10-15 g/dm3，而铁离子的浓度不超过 1 mg/dm3，因此可以利用这些溶液进行铜的电萃取。用腐植酸溶液对污泥进行改性，可将其对铜离子的吸附能力提高三倍以上。

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来源期刊

Journal of Water Chemistry and Technology CHEMISTRY, APPLIED-CHEMISTRY, ANALYTICAL

自引率

0.00%

发文量

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.