Urology and Nephrology Center, Mansoura University, Mansoura, Egypt.
Petrochemical Program, Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
Environ Sci Pollut Res Int. 2024 Jun;31(29):42330-42341. doi: 10.1007/s11356-024-33860-3. Epub 2024 Jun 13.
A novel mesoporous magnetic biochar (MBC) was prepared, using a randomly growing plant, i.e., common reed, as an exporter of carbon, and applied for removal of methylene blue (MB) from aqueous solutions. The prepared sorbent was characterized by nitrogen adsorption/desorption isotherm, saturation magnetization, pH of point of zero charges (pH), Fourier-transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The obtained MBC has a specific surface area of 94.2 m g and a pore radius of 4.1 nm, a pore volume of 0.252 cm g, a saturation magnetization of 0.786 emu g, and a pH of 6.2. Batch adsorption experiments were used to study the impact of the physicochemical factors involved in the adsorption process. The findings revealed that MB removal by MBC was achieved optimally at pH 8.0, sorbent dosage of 1.0 g L, and contact time of 30 min. At these conditions, the maximum adsorption was 353.4 mg g. Furthermore, the adsorption isotherm indicated that the Langmuir pattern matched well with the experimental data, compared to the Freindlich model. The ∆G was - 6.7, - 7.1, and - 7.5 kJ mol, at 298, 308, and 318 K, respectively, indicating a spontaneous process. The values of ∆H and ∆S were 5.71 kJ mol and 41.6 J mol K, respectively, suggesting endothermic and the interaction between MB and MBC is van der Waals type. The absorbent was regenerated and reused for four cycles after elution with 0.1 mol L of HCl. This study concluded that the magnetic biochar generated from common reed has tremendous promise in the practical use of removing MB from wastewater.
一种新型介孔磁性生物炭（MBC）被制备出来，使用一种随机生长的植物，即芦苇，作为碳的来源，并将其应用于从水溶液中去除亚甲基蓝（MB）。所制备的吸附剂通过氮气吸附/解吸等温线、饱和磁化强度、零电荷点的 pH 值（pH）、傅里叶变换红外光谱（FT-IR）和扫描电子显微镜（SEM）进行了表征。得到的 MBC 具有 94.2 m²/g 的比表面积和 4.1 nm 的孔径、0.252 cm³/g 的孔体积、0.786 emu/g 的饱和磁化强度和 6.2 的 pH 值。批量吸附实验用于研究吸附过程中涉及的物理化学因素的影响。结果表明，MBC 对 MB 的去除在 pH 8.0、吸附剂用量 1.0 g/L 和接触时间 30 min 时达到最佳。在这些条件下，最大吸附量为 353.4 mg/g。此外，吸附等温线表明，与 Freundlich 模型相比，Langmuir 模型更能很好地拟合实验数据。在 298、308 和 318 K 时，∆G 分别为-6.7、-7.1 和-7.5 kJ/mol，表明这是一个自发过程。∆H 和 ∆S 的值分别为 5.71 kJ/mol 和 41.6 J/mol·K，表明这是一个吸热过程，MB 和 MBC 之间的相互作用是范德华类型的。吸附剂在 0.1 mol/L HCl 洗脱后经过四个循环再生和重复使用。本研究表明，从芦苇中产生的磁性生物炭在实际应用中具有巨大的潜力，可以从废水中去除 MB。
