Abd-Elhamid A I, Mostafa A G, Nayl A A, Akl M A
Composites and Nanostructured Materials Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg Al-Arab, Alexandria, 21934, Egypt.
Chemistry Department, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt.
Sci Rep. 2024 Aug 19;14(1):19129. doi: 10.1038/s41598-024-60193-5.
In this research, we reported the synthesis of effective sulphonated sugarcane bagasse (SCB@SA) biosorbent based on agriculture waste materials via a simple diazotization strategy for the removal of methylene blue (MB) and Bismarck Brown R(BB) dyes from waste water samples. First, the sugarcane bagasse (SCB) waste was collected, grinded, and sieved to obtain the desired size. Secondly, the SCB powder is modified with sulfanilinic acid (SA) via the formation of its diazonium salt to introduce sulfonic groups on the SCB surface. Different advanced techniques were applied to characterize the prepared materials before and after the adsorption process viz. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS) and Thermogravimetric analysis (TGA). Different parameters affecting the adsorption process of both MB and BB were studied. Because of the higher correlation coefficient (R ≥ 0.999) and lower error functions, the equilibrium MB and BB adsorption isotherms for a single-dye system fit Langmuir with maximum adsorption capacity reaching to 127.48 and 166.75 mg/g for MB and BB, respectively. Moreover, the R values obtained for both dyes lie between 0 and 1, indicating that MB and BB adsorption by SCB@SA is a favorable process. Besides, the error functions' values of the pseudo-2nd-order are significantly lower than those of the pseudo-1st-order, implying that the adsorption MB and BB onto SCB@SA biosorbent fitted the pseudo-2nd-order kinetic model in a chemosorption manner. In the thermodynamic studies, the adsorption process is spontaneous, exothermic, and has less randomness. In addition, the SCB@SA biosorbent could be reused in five cycles maintaining on suitable adsorption efficiency. Finally, the MB and BB dyes could be adsorbed on the SCB@SA biosorbent via three mechanisms including π-π stacking, columbic attraction, and hydrogen bonding.
在本研究中，我们报道了基于农业废料通过简单的重氮化策略合成有效的磺化甘蔗渣（SCB@SA）生物吸附剂，用于从废水样品中去除亚甲基蓝（MB）和俾斯麦棕R（BB）染料。首先，收集甘蔗渣（SCB）废料，研磨并筛分以获得所需尺寸。其次，通过形成其重氮盐用磺胺酸（SA）对SCB粉末进行改性，以在SCB表面引入磺酸基团。在吸附过程前后应用不同的先进技术对制备的材料进行表征，即扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、能量色散X射线光谱（EDS）和热重分析（TGA）。研究了影响MB和BB吸附过程的不同参数。由于较高的相关系数（R≥0.999）和较低的误差函数，单染料体系中MB和BB的平衡吸附等温线符合Langmuir等温线，MB和BB的最大吸附容量分别达到127.48和166.75 mg/g。此外，两种染料获得的R值介于0和1之间，表明SCB@SA对MB和BB的吸附是一个有利的过程。此外，伪二级动力学的误差函数值明显低于伪一级动力学，这意味着MB和BB在SCB@SA生物吸附剂上的吸附以化学吸附方式符合伪二级动力学模型。在热力学研究中，吸附过程是自发的、放热的，且随机性较小。此外，SCB@SA生物吸附剂可以重复使用五个循环并保持适当的吸附效率。最后，MB和BB染料可以通过π-π堆积、静电吸引和氢键三种机制吸附在SCB@SA生物吸附剂上。
