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首页> 外文期刊>International Journal of Environmental Research and Public Health >Graphene Oxide–ZnO Nanocomposites for Removal of Aluminum and Copper Ions from Acid Mine Drainage Wastewater
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Graphene Oxide–ZnO Nanocomposites for Removal of Aluminum and Copper Ions from Acid Mine Drainage Wastewater

机译：石墨烯氧化氮 - 氮纳米复合材料，用于从酸性矿井排水废水中除去铝和铜离子

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Adsorption technologies are a focus of interest for the removal of pollutants in water treatment systems. These removal methods offer several design, operation and efficiency advantages over other wastewater remediation technologies. Particularly, graphene oxide (GO) has attracted great attention due to its high surface area and its effectiveness in removing heavy metals. In this work, we study the functionalization of GO with zinc oxide nanoparticles (ZnO) to improve the removal capacity of aluminum (Al) and copper (Cu) in acidic waters. Experiments were performed at different pH conditions (with and without pH adjustment). In both cases, decorated GO (GO/ZnO) nanocomposites showed an improvement in the removal capacity compared with non-functionalized GO, even when the pH of zero charge (pH PZC ) was higher for GO/ZnO (5.57) than for GO (3.98). In adsorption experiments without pH adjustment, the maximum removal capacities for Al and Cu were 29.1 mg/g and 45.5 mg/g, respectively. The maximum removal percentages of the studied cations (Al and Cu) were higher than 88%. Further, under more acidic conditions (pH 4), the maximum sorption capacities using GO/ZnO as adsorbent were 19.9 mg/g and 33.5 mg/g for Al and Cu, respectively. Moreover, the removal percentages reach 95.6% for Al and 92.9% for Cu. This shows that decoration with ZnO nanoparticles is a good option for improving the sorption capacity of GO for Cu removal and to a lesser extent for Al, even when the pH was not favorable in terms of electrostatic affinity for cations. These findings contribute to a better understanding of the potential and effectiveness of GO functionalization with ZnO nanoparticles to treat acidic waters contaminated with heavy metals and its applicability for wastewater remediation.
机译：吸附技术是在水处理系统中去除污染物的兴趣令人瞩目的焦点。这些拆除方法提供了其他污水修复技术的多种设计，操作和效率优势。特别是，石墨烯氧化物（GO）由于其高表面积和其在除去重金属的有效性而引起了极大的关注。在这项工作中，我们研究了与氧化锌纳米颗粒（ZnO）的官能化，以改善酸性水中铝（Al）和铜（Cu）的去除能力。在不同的pH条件下进行实验（有没有pH调节）。在这两种情况下，装饰GO（GO / ZnO）纳米复合材料显示出与非官能化的去除容量的改善，即使当GO / ZnO（5.57）的零电荷（pH pZC）的pH高于Go（ 3.98）。在没有pH调节的吸附实验中，Al和Cu的最大去除能力分别为29.1mg / g和45.5mg / g。研究的阳离子（Al和Cu）的最大去除百分比高于88％。此外，在更酸性的条件下（pH 4），使用Go / ZnO作为吸附剂的最大吸附能力分别为Al和Cu为19.9mg / g和33.5mg / g。此外，除去百分比对于Al达到95.6％，Cu的92.9％达到95.6％。这表明用ZnO纳米粒子的装饰是改善Cu去除的吸附能力的良好选择，即使在对阳离子的静电亲和力方面不利的情况下，即使pH也不好的程度。这些发现有助于更好地理解与ZnO纳米颗粒的潜力官能化的潜在和有效性，以治疗污染重金属污染的酸性水域及其对废水修复的适用性。

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