Abstract
We evaluated the sorptive properties of mordenite zeolite (MOR), a copper terephthalate metal–organic framework (MOF), and graphene oxide (GO) and their potential use in treating acid rock drainage (ARD) containing Fe3+, Cu2+, Mn2+, Zn2+, Pb2+, and Cd2+ ions. MOR was prepared via a hydrothermal method, MOF was prepared via a solvothermal method, and few-layered GO nanosheets were synthesized using Hummers’ method. The aqueous contaminants were removed by chemico-physical sorption and ion exchange in batch tests. It proved possible to dramatically improve removal efficiency and sorptive capacity by optimizing experimental conditions. Magnetic MOF crystals were more efficient in removing metals than the MOR and GO. Sorption tests using ARD from the Sungun copper mine and a multi-component solution containing cationic metal species revealed that both GO nanosheets and magnetic MOF have great potential for ARD treatment.
Zusammenfassung
Untersucht wurden die Sorptionseigenschaften des Zeolithminerals Mordenit (MOR), eines Kupfer-Terephtalats aus der Klasse der metallorganischen Gerüstverbindungen (MOF) und von Graphenoxid (GO), sowie deren Potential zur Behandlung von Sauerwasser (ARD) mit Gehalten an Fe3+, Cu2+, Mn2+, Zn2+, Pb2+und Cd2+. MOR wurde mittels Hydrothermalsynthese, MOF unter Nutzung einer Solvothermalmethode hergestellt. Die Synthese der dünnen GO-Nanoschichten erfolgte entsprechend der Methode nach Hummer. Die Wasserschadstoffe wurden in Batch-Tests durch physikochemische Sorption und Ionenaustausch abgereichert. Es konnte gezeigt werden, dass sich Abreinigungsvermögen und Sorptionskapazität der getesteten Materialien durch Optimierung der experimentellen Bedingungen erheblich verbessern lassen. Die magnetischen MOF-Kristalle wiesen in Bezug auf die Entfernung der Schwermetalle bessere Ergebnisse auf als MOR und GO. Sorptionstests mit Sauerwasser von der Sungun-Kupfermine sowie mit einer kationische Metallspezies enthaltenden Mehrkomponentenlösung ergaben, dass sowohl GO-Nanoschichten als auch magnetisches MOF ein großes Potential zur Sauerwasserbehandlung besitzen.
Resumen
Evaluamos las propiedades sortivas de zeolita mordenita (MOR), un sistema orgánico metálico –tereftalato de cobre- (MOF), un óxido de grafeno (GO) y sus potenciales usos en el tratamiento de drenaje ácido de roca (ARD) conteniendo iones Fe3+, Cu2+, Mn2+, Zn2+, Pb2+y Cd2+. MOR fue preparada por un método hidrotermal, MOF fue preparado por un método solvotermal y pocas capas de nanoláminas GO fueron sintetizadas usando el método de Hummers. Los contaminantes acuosos fueron removidos por sorción químico-física e intercambio iónico en estudios en batch. Se probó que pueden mejorarse significativamente las eficiencias de remoción y las capacidades sortivas, optimizando las condiciones experimentales. Los cristales magnéticos MOF fueron más eficientes en remover metales que MOR y GO. Los estudios de sorción usando ARD desde la mina de cobre Sungun y una solución multicomponente conteniendo cationes metálicos mostraron que tanto las nanoláminas GO como las MOF magnéticas tienen un gran potencial para el tratamiento de ARD.
摘要
本文评价了丝光沸石(MOR)、对苯二甲酸铜金属-有机框架材料(MOF)和氧化石墨烯(GO)的吸附特性以及它们处理含Fe3+、Cu2+、Mn2+、Zn2+、Pb2+和Cd2+的酸性岩石废水(ARD)的能力。水热法制备丝光沸石(MOR),溶剂热法制备对苯二甲酸铜金属-有机框架材料(MOF),Hummers法合成氧化石墨烯(GO)纳米片。化学-物理吸附作用和离子交换作用去除了批次试验中的水合污染物。试验证明,优化实验条件可以显著提高去除效率和吸附能力。对苯二甲酸铜金属-有机框架材料(MOF) 的磁化晶体比丝光沸石(MOR)和氧化石墨烯(GO)去除金属离子效率更高。Sungun铜矿酸性岩石废水(ARD)和含金属阳离子的多组分溶液的吸附试验证明,氧化石墨烯(GO)纳米片和对苯二甲酸铜金属-有机框架材料(MOF)磁化晶体具有巨大的处理酸性岩石废水(ARD)的潜力。.
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Acknowledgments
The authors are grateful to Mr. Rezai from the Sungun Copper Mine for providing an ARD wastewater sample.
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Rahimi, E., Mohaghegh, N. Removal of Toxic Metal Ions from Sungun Acid Rock Drainage Using Mordenite Zeolite, Graphene Nanosheets, and a Novel Metal–Organic Framework. Mine Water Environ 35, 18–28 (2016). https://doi.org/10.1007/s10230-015-0327-7
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DOI: https://doi.org/10.1007/s10230-015-0327-7