Department of Environmental Health Engineering, Neyshabur University of Medical Sciences, Neyshabur, Iran.
Department of Environmental Health Engineering, Zanjan University of Medical Sciences, Zanjan, Iran.
Sci Rep. 2022 Sep 12;12(1):15314. doi: 10.1038/s41598-022-19550-5.
Among cationic dyes, malachite green (MG) is commonly used for dying purposes and also as an inhibitor in aquaculture, food, health, and chemical industries due to its cytotoxic effects. Therefore, MG removal is essential to keep the ecosystem and human health safety. Adsorption is a viable and versatile option and exploring efficient adsorbents have high priority. Herein, MOF-5 and aminated corn Stover reduced graphene oxide (ACS-RGO) of typical adsorbents of metal-organic-frameworks (MOFs) and carbon-based classes were studied for MG removal. MOF-5 and ACS-RGO had a specific surface area and total pore volume of 507.4 and 389.0 m/g, and 0.271 cm/g and 0.273 cm/g, respectively. ACS-RGO was superior for MG adsorption and the kinetic rate coefficient for ACS-RGO was ~ 7.2 times compared to MOF-5. For ACS-RGO, MG removal remained high (> 94%) in a wide range of pH. However, dye removal was pH-dependent for MOF-5 and increased from ~ 32% to ~ 67% by increasing pH from 4 to 12. Increasing dye concentration from 25 mg/L to 100 mg/L decreased adsorption by MOF-5 and ACS-RGO for ~ 30% and 7%, respectively. Dye removal was evident in a few tens of seconds after adding ACS-RGO at doses above 0.5 g/L. A significant loss of 46% in adsorption was observed by decreasing MOF-5 mass from 1 to 0.1 g/L. ACS-RGO removed MG in multilayer with an exceptional adsorption capacity of 1088.27 mg/g. In conclusion, ACS-RGO, and MOF-5 showed promising kinetic rates and adsorption capacities toward MG.
在阳离子染料中，由于其细胞毒性作用，孔雀石绿 (MG) 通常被用于染色目的，并在水产养殖、食品、健康和化工行业用作抑制剂。因此，去除 MG 对于保持生态系统和人类健康安全至关重要。吸附是一种可行且多功能的选择，探索高效的吸附剂具有很高的优先级。本文研究了典型的金属有机骨架 (MOFs) 和碳基类吸附剂 MOF-5 和胺化玉米秸秆还原氧化石墨烯 (ACS-RGO) 对 MG 的去除。MOF-5 和 ACS-RGO 的比表面积和总孔体积分别为 507.4 和 389.0 m/g，0.271 和 0.273 cm/g。ACS-RGO 对 MG 的吸附性能更为优越，ACS-RGO 的动力学速率常数比 MOF-5 高7.2 倍。对于 ACS-RGO，MG 的去除率在很宽的 pH 范围内仍保持较高 (>94%)。然而，MOF-5 的染料去除率依赖于 pH，从 4 到 12 时，pH 增加使去除率从32%增加到67%。将染料浓度从 25 mg/L 增加到 100 mg/L 会使 MOF-5 和 ACS-RGO 的吸附量分别降低30%和 7%。将 ACS-RGO 的剂量增加到 0.5 g/L 以上后，在几十秒内即可观察到染料的去除。当 MOF-5 的质量从 1 减少到 0.1 g/L 时，吸附量会明显损失 46%。ACS-RGO 以 1088.27 mg/g 的出色吸附容量对 MG 进行了多层去除。总之，ACS-RGO 和 MOF-5 对 MG 表现出了良好的动力学速率和吸附能力。
