Rocha Luciana S, Sousa Érika M L, Gil María V, Oliveira João A B P, Otero Marta, Esteves Valdemar I, Calisto Vânia
Department of Chemistry and CESAM, University of Aveiro, 3810-193 Aveiro, Portugal.
Instituto de Ciencia y Tecnología del Carbono, INCAR-CSIC, Francisco Pintado Fe 26, 33011 Oviedo, Spain.
Nanomaterials (Basel). 2021 Jan 22;11(2):287. doi: 10.3390/nano11020287.
In view of a simple after-use separation, the potentiality of producing magnetic activated carbon (MAC) by intercalation of ferromagnetic metal oxide nanoparticles in the framework of a powder activated carbon (PAC) produced from primary paper sludge was explored in this work. The synthesis conditions to produce cost effective and efficient MACs for the adsorptive removal of pharmaceuticals (amoxicillin, carbamazepine, and diclofenac) from aqueous media were evaluated. For this purpose, a fractional factorial design (FFD) was applied to assess the effect of the most significant variables (Fe to Fe salts ratio, PAC to iron salts ratio, temperature, and pH), on the following responses concerning the resulting MACs: Specific surface area (), saturation magnetization (), and adsorption percentage of amoxicillin, carbamazepine, and diclofenac. The statistical analysis revealed that the PAC to iron salts mass ratio was the main factor affecting the considered responses. A quadratic linear regression model A = f(, ) was adjusted to the FFD data, allowing to differentiate four of the eighteen MACs produced. These MACs were distinguished by being easily recovered from aqueous phase using a permanent magnet ( of 22-27 emu g), and their high (741-795 m g) were responsible for individual adsorption percentages ranging between 61% and 84% using small MAC doses (35 mg L).
鉴于使用后易于分离，本研究探讨了在由原生纸污泥制备的粉末活性炭（PAC）框架内插入铁磁金属氧化物纳米颗粒来生产磁性活性炭（MAC）的潜力。评估了生产具有成本效益且高效的MAC以从水介质中吸附去除药物（阿莫西林、卡马西平和双氯芬酸）的合成条件。为此，采用分数因子设计（FFD）来评估最显著变量（铁与铁盐的比例、PAC与铁盐的比例、温度和pH）对所得MAC的以下响应的影响：比表面积（）、饱和磁化强度（）以及阿莫西林、卡马西平和双氯芬酸的吸附百分比。统计分析表明，PAC与铁盐的质量比是影响所考虑响应的主要因素。将二次线性回归模型A = f(, )应用于FFD数据，从而能够区分所制备的18种MAC中的4种。这些MAC的特点是使用永磁体（22 - 27 emu g）可轻松从水相中回收，并且它们的高比表面积（741 - 795 m g）使得在使用小剂量MAC（35 mg L）时，单个吸附百分比在61%至84%之间。
