AlMohaimadi Khaled M, Albishri Hassan M, Thumayri Khaled A, AlSuhaimi Awadh O, Mehdar Yassin T H, Hussein Belal H M
Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
Chemistry Department, Faculty of Science, Taibah University, Medina Munwarah 42353, Saudi Arabia.
Gels. 2024 Dec 19;10(12):839. doi: 10.3390/gels10120839.
This work presents a novel hydrothermally aided sol-gel method for preparation of mesoporous silica nanoparticles (MSNs) with a narrow particle size distribution and varied pore sizes. The method was carried out in alkaline media in presence of polyethylene glycol (PEG) and cetyltrimethylammonium chloride (CTAC) as dual templates and permitted the synthesis of spherical mesoporous silica with a high surface area (1011.42 m/g). The MSN materials were characterized by FTIR, Thermogravimetric (TG), Nitrogen adsorption and desorption and Field emission scanning electron microscopic analysis (FESEM). The materials feasibility as solid phase adsorbent has been demonstrated using cationic dyes; Rhodamine B (RB) and methylene blue (MB) as models. Due to the large surface area and variable pore width, the adsorption behaviors toward cationic dyes showed outstanding removal efficiency and a rapid sorption rate. The adsorption isotherms of RB and MB were well-fitted to the Langmuir and Freundlich models, while the kinetic behaviours adhered closely to the pseudo-second-order pattern. The maximum adsorption capacities were determined to be 256 mg/g for MB and 110.3 mg/g for RB. The findings suggest that MSNs hold significant potential as solid-phase nanosorbents for the extraction and purification of dye pollutants, particularly in the analysis and treatment of effluents containing cationic dyes.
本研究提出了一种新型的水热辅助溶胶-凝胶法，用于制备粒径分布窄且孔径各异的介孔二氧化硅纳米颗粒（MSNs）。该方法在碱性介质中进行，以聚乙二醇（PEG）和十六烷基三甲基氯化铵（CTAC）作为双模板，能够合成具有高比表面积（1011.42 m²/g）的球形介孔二氧化硅。通过傅里叶变换红外光谱（FTIR）、热重分析（TG）、氮吸附-脱附以及场发射扫描电子显微镜分析（FESEM）对MSN材料进行了表征。以阳离子染料罗丹明B（RB）和亚甲基蓝（MB）为模型，证明了该材料作为固相吸附剂的可行性。由于具有大的比表面积和可变的孔径宽度，对阳离子染料的吸附行为表现出优异的去除效率和快速的吸附速率。RB和MB的吸附等温线与朗缪尔模型和弗伦德里希模型拟合良好，而动力学行为则紧密遵循准二级模式。MB和RB的最大吸附容量分别确定为256 mg/g和110.3 mg/g。研究结果表明，MSNs作为用于染料污染物提取和净化的固相纳米吸附剂具有巨大潜力，特别是在含阳离子染料废水的分析和处理方面。
