The present work describes three newly-prepared magnetic-carbon composites (M-CCs) applied as adsorbents. The M-CCs were prepared by the co-precipitation method, grafting Fe(II) and Fe(III) oxides onto the surface of different matrices: PAC, GNP and MWCNT in order to achieve M-PAC, M-GNP and M-MWCNT, respectively. The composites were characterized by Fourier Transform Infrared spectroscopy, X-ray Diffraction Spectroscopy. Scanning Electron Microscopy was used for characterization of M-MWCNTs, Transmission Electron Microscopy was used for characterization of M-GNP composites. Thermogravimetric analyses were performed for each of the three M-CCs. It is found that about 70% of M-CCs consist in Fe₃O₄ nanoparticles. M-CCs adsorption features and performance towards the removal of a pollutant model from aqueous solutions was established. They were tested for Metformin hydrochloride adsorption, a worldwide antidiabetic pharmaceutical agent. The parameters of adsorbent dose, adsorption duration, initial concentration of adsorbate solution, temperature, pH and co-existing ion concentration were considered as adsorption independent variables. The kinetic tests show that the Pseudo second order kinetic model (PSO) fit best the three-adsorption systems. M-GNP is the fastest adsorbent of the three (k₂ = 0.36 g/mg min). The three investigated adsorption systems obey the Langmuir isotherm model. Pinpointing M-GNP (q_m = 8.83 mg/g) as the most efficient adsorbent in normal conditions, and M-MWCNT (q_m = 26.17 mg/g at 318 K) at higher values of temperature. Acid conditions favor adsorption of Metformin hydrochloride onto M-MWCNT, alkaline for M-PAC, whereas M-GNP provides best performance under amphoteric conditions. Coexisting ions affected Metformin hydrochloride adsorption only in case of M-MWCNT and M-GNP. Desorption tests were also carried out by using phosphate buffer solution. M-GNP provides best desorption ratios, reaching nearly 66% of Metformin hydrochloride desorption after each use.

本工作描述了三种新制备的用作吸附剂的磁性碳复合材料（M-CC）。M-CC通过共沉淀法制备，将Fe（II）和Fe（III）氧化物接枝到不同基质（PAC，GNP和MWCNT）的表面上，以实现M-PAC，M-GNP和M- MWCNT，分别。通过傅立叶变换红外光谱，X射线衍射光谱对复合材料进行表征。扫描电子显微镜用于表征M-MWCNT，透射电子显微镜用于表征M-GNP复合材料。对三个M-CC中的每一个进行热重分析。发现大约70％的M-CCs包含在Fe ₃ O _4中纳米粒子。建立了M-CCs吸附特征和从水溶液中去除污染物模型的性能。对它们进行了盐酸二甲双胍吸附的测试，这是一种全球性的抗糖尿病药物。吸附剂剂量，吸附持续时间，吸附物溶液的初始浓度，温度，pH和共存离子浓度等​​参数均被视为吸附独立变量。动力学测试表明，伪二级动力学模型（PSO）最适合三吸附系统。M-GNP是这三种中最快的吸附剂（k ₂  = 0.36 g / mg min）。研究的三个吸附系统遵循Langmuir等温模型。精确定位M-GNP（q _m 在正常条件下为最有效的吸附剂，吸附量为8.83 mg / g； 在较高温度下，M-MWCNT（在318 K下，q _m = 26.17 mg / g）是最有效的吸附剂。酸性条件有利于盐酸二甲双胍吸附在M-MWCNT上，对M-PAC呈碱性，而M-GNP在两性条件下提供最佳性能。仅在M-MWCNT和M-GNP的情况下，共存离子才影响盐酸二甲双胍的吸附。还通过使用磷酸盐缓冲溶液进行了脱附测试。M-GNP提供最佳的脱附率，每次使用后达到接近二甲双胍盐酸盐脱附率的66％。