Supercritical carbon dioxide chelation extraction of heavy metal ions from drilling fluid waste: Experiment and simulation

IF 5.3 2区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY Arabian Journal of Chemistry Pub Date : 2024-08-29 DOI:10.1016/j.arabjc.2024.105978
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Abstract

This study evaluates the application of supercritical carbon dioxide chelation extraction technology for treating heavy metal ions (Zn2+ and Cr3+) in drilling fluid waste. Through a combination of experimental and molecular dynamics simulation methods, the influence of extraction parameters (temperature, pressure, duration, and chelating agents) on the extraction efficiency are investigated. Findings show that increased duration and pressure significantly improve extraction efficiency, while temperature has a complex effect, initially increasing efficiency but plateauing and slightly decreasing at higher temperatures. The optimum extraction condition with pressure of 220 bar, temperature 348.15 K and an extraction duration of 70 min using ethylene diamine tetraacetic acid (EDTA) as the chelating agent has been determined. Importantly, molecular simulation analysis revealed that citric acid outperforms EDTA in terms of Zn2+ and Cr3+ aggregation by forming larger aggregates with greater numbers of molecules while reducing overall aggregate count. Furthermore, optimization of extraction pressure in the EDTA system shows potential benefits. These results suggest that supercritical carbon dioxide chelation extraction technology has strong potential for environmentally friendly and reliable waste management in the drilling industry. This study represents a significant step forward in developing sustainable solutions for heavy metal removal from drilling fluid waste.

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超临界二氧化碳螯合萃取钻井液废弃物中的重金属离子:实验与模拟
本研究评估了超临界二氧化碳螯合萃取技术在处理钻井液废弃物中重金属离子(Zn2+ 和 Cr3+)方面的应用。通过实验和分子动力学模拟相结合的方法,研究了萃取参数(温度、压力、持续时间和螯合剂)对萃取效率的影响。研究结果表明,持续时间和压力的增加会显著提高萃取效率,而温度的影响则比较复杂,最初会提高效率,但在温度较高时效率会趋于稳定并略有下降。使用乙二胺四乙酸(EDTA)作为螯合剂,确定了压力为 220 巴、温度为 348.15 K、萃取时间为 70 分钟的最佳萃取条件。重要的是,分子模拟分析表明,柠檬酸在 Zn2+ 和 Cr3+ 的聚集方面优于 EDTA,因为柠檬酸能形成分子数量更多的较大聚集体,同时减少总体聚集体数量。此外,在 EDTA 系统中优化萃取压力也有潜在的好处。这些结果表明,超临界二氧化碳螯合萃取技术在钻井行业的环保和可靠废物管理方面具有强大的潜力。这项研究标志着在开发可持续的钻井液废物重金属去除解决方案方面迈出了重要一步。
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来源期刊
Arabian Journal of Chemistry
Arabian Journal of Chemistry CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
10.80
自引率
3.30%
发文量
763
审稿时长
63 days
期刊介绍: The Arabian Journal of Chemistry is an English language, peer-reviewed scholarly publication in the area of chemistry. The Arabian Journal of Chemistry publishes original papers, reviews and short reports on, but not limited to: inorganic, physical, organic, analytical and biochemistry. The Arabian Journal of Chemistry is issued by the Arab Union of Chemists and is published by King Saud University together with the Saudi Chemical Society in collaboration with Elsevier and is edited by an international group of eminent researchers.
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