Moharm Asmaa Elsherbeny, El Naeem Gamal A, Soliman Hesham M A, Abd-Elhamid Ahmed I, El-Bardan Ali A, Kassem Taher S, Nayl AbdElAziz A, Bräse Stefan
Department of Chemistry, Faculty of Science, Alexandria University, P.O. Box 426, Alexandria 21321, Egypt.
Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), P.O. Box 179, New Borg AlArab 21934, Alexandria, Egypt.
Polymers (Basel). 2022 Jun 26;14(13):2587. doi: 10.3390/polym14132587.
The main aim of this work is to treat sugarcane bagasse agricultural waste and prepare an efficient, promising, and eco-friendly adsorbent material. Biochar is an example of such a material, and it is an extremely versatile and eco-friendly biosorbent to treat wastewater. Crystal violet (CV)-dye and methylene blue (MB)-dye species are examples of serious organic pollutants. Herein, biochar was prepared firstly from sugarcane bagasse (SCB), and then a biochar biosorbent was synthesized through pyrolysis and surface activation with NaOH. SEM, TEM, FTIR, Raman, surface area, XRD, and EDX were used to characterize the investigated materials. The reuse of such waste materials is considered eco-friendly in nature. After that, the adsorption of MB and CV-species from synthetically prepared wastewater using treated biochar was investigated under various conditions. To demonstrate the study's effectiveness, it was attempted to achieve optimum effectiveness at an optimum level by working with time, adsorbent dose, dye concentration, NaCl, pH, and temperature. The number of adsorbed dyes reduced as the dye concentrations increased and marginally decreased with NaCl but increased with the adsorbent dosage, pH, and temperature of the solution increased. Furthermore, it climbed for around 15 min before reaching equilibrium, indicating that all pores were almost full. Under the optimum condition, the removal perecentages of both MB and CV-dyes were ≥98%. The obtained equilibrium data was represented by Langmuir and Freundlich isotherm models. Additionally, the thermodynamic parameters were examined at various temperatures. The results illustrated that the Langmuir isotherm was utilized to explain the experimental adsorption processes with maximum adsorption capacities of MB and CV-dyes were 114.42 and 99.50 mgg, respectively. The kinetic data were estimated by pseudo-first and pseudo-second-order equations. The best correlation coefficients of the investigated adsorption processes were described by the pseudo-second-order kinetic model. Finally, the data obtained were compared with some works published during the last four years.
这项工作的主要目的是处理甘蔗渣农业废弃物，并制备一种高效、有前景且环保的吸附材料。生物炭就是这样一种材料的例子，它是一种用途极为广泛且环保的用于处理废水的生物吸附剂。结晶紫（CV）染料和亚甲基蓝（MB）染料是严重有机污染物的例子。在此，首先由甘蔗渣（SCB）制备生物炭，然后通过热解和用NaOH进行表面活化合成生物炭吸附剂。使用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）、拉曼光谱、表面积、X射线衍射（XRD）和能量散射X射线谱（EDX）对所研究的材料进行表征。这种废料的再利用本质上被认为是环保的。之后，研究了在各种条件下使用经处理的生物炭从合成废水中吸附MB和CV染料的情况。为了证明该研究的有效性，试图通过控制时间、吸附剂剂量、染料浓度、氯化钠、pH值和温度，在最佳水平实现最佳效果。随着染料浓度的增加，吸附的染料数量减少，随着氯化钠的增加略有减少，但随着吸附剂用量、溶液的pH值和温度的升高而增加。此外，在达到平衡之前，它在大约15分钟内上升，表明所有孔隙几乎都被填满。在最佳条件下，MB和CV染料的去除率均≥98%。所获得的平衡数据用朗缪尔和弗伦德利希等温线模型表示。此外，在不同温度下研究了热力学参数。结果表明，朗缪尔等温线用于解释实验吸附过程，MB和CV染料的最大吸附容量分别为114.42和99.50 mg/g。动力学数据通过拟一级和拟二级方程估算。所研究的吸附过程的最佳相关系数由拟二级动力学模型描述。最后，将获得的数据与过去四年发表的一些研究进行了比较。
