Centre for Nano-materials & Displays, B.M.S. College of Engineering, Bull Temple Road, Basavanagudi, Bengaluru, Karnataka, 560 019, India.
Department of Civil Engineering, B.M.S. College of Engineering, Bull Temple Road, Basavanagudi, Bengaluru, Karnataka, 560 019, India.
Environ Sci Pollut Res Int. 2022 Nov;29(52):79067-79081. doi: 10.1007/s11356-022-21251-5. Epub 2022 Jun 15.
In the present study, recyclable porous nano-carbons (PNCs) were used to remove textile dyes (mainly methylene blue, methyl orange, and rhodamine B) from an aqueous environment. Due to their high surface area and mesoporous nature, PNCs exhibited extremely fast and efficient adsorption behavior. PNCs synthesized at an elevated temperature of 1000 °C are used in batch experiments, as they showed maximum dye removal with high surface area. Batch mode was used to optimize operational parameters such as initial dye concentration, contact time, adsorbent dose and pH as a function of time. Within ~7 minutes of treatment, PNCs achieved a maximum removal efficacy of ~99 percent for methylene blue. The recyclability of PNCs was investigated, and it retained its efficiency even after seven cycles. The efficacy of PNCs in treating industrial water contaminated with methylene blue dye was assessed. Different adsorption isotherms were carried out to determine maximum amount of dye that can be adsorbed on to surface of PNCs. The maximum adsorption capacity attained using Langmuir isotherm for methylene blue was around 1216.54 mg g. Adsorption kinetics were applied on experimental data to identify the rate of adsorption. It was confirmed that novel onion peel-based porous PNCs were successful in removing methylene blue dye effectively with short duration in comparison with other dyes mainly rhodamine B and methyl orange.
在本研究中，使用可回收的多孔纳米碳（PNC）从水环境中去除纺织染料（主要是亚甲蓝、甲基橙和罗丹明 B）。由于其高表面积和中孔性质，PNC 表现出极快和高效的吸附行为。在 1000°C 的高温下合成的 PNC 用于批量实验，因为它们具有最大的染料去除率和高表面积。批量模式用于优化操作参数，例如初始染料浓度、接触时间、吸附剂剂量和 pH 值随时间的变化。在处理约 7 分钟后，PNC 对亚甲蓝的去除效率达到了约 99%。研究了 PNC 的可回收性，即使经过七次循环，它仍保持效率。评估了 PNC 处理工业废水中亚甲蓝染料的效果。进行了不同的吸附等温线实验，以确定 PNC 表面可吸附的最大染料量。使用 Langmuir 等温线获得的亚甲蓝的最大吸附容量约为 1216.54 mg/g。将吸附动力学应用于实验数据以确定吸附速率。结果证实，与其他染料（主要是罗丹明 B 和甲基橙）相比，新型洋葱皮基多孔 PNC 能够在短时间内有效地去除亚甲蓝染料。
