Khatoon Afsana, Siddiqui Shaziya, Haq Nazrul
Department of Chemistry, Sam Higginbottom University of Agriculture Technology and Sciences, Prayagraj 211007, U.P., India.
Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, 11451, Saudi Arabia..
J Contam Hydrol. 2025 Feb;269:104503. doi: 10.1016/j.jconhyd.2025.104503. Epub 2025 Jan 21.
The study emphasize on the synthesis of eco-friendly cellulose based magnetic nanocomposite derived from Lens cullnaris husk and Poly Vinyl Alcohol (FeO@LENT/PVA) for the adsorption of Crystal Violet, Methylene Blue and Malachite Green Dye. The structural and functional morphology was determined by SEM-EDAX analysis and FTIR. The crystalline of FeO@LENT/PVA was analyzed by XRD and pore size was determined by BET. The surface area of nanocellulose FeO@LENT/PVA was found to be 22.308 m/g and the pore volume of 0.074cm/g. The FeO@LENT/PVA nanocomposites show successful adsorption of CV, MB and MG in 120 min equilibrium time at pH 7 for CV and 8 for MB and MG respectively. The FeO@LENT/PVA nanocomposites was best fitted Langmuir isotherm and follows pseudo 2nd order kinetics with intra particle as rate controlling mechanism. The nanocellulose FeO@LENT/PVA composite shows good monolayer adsorption capacity in the order of CV(357 mg/g) > MB(112.35 mg/g) > MG(111.11 mg/g). Thermodynamic study reveals the process is endothermic and spontaneous in nature with ΔG value less than 20KJ mol at respective temperatures indicating Physiosorption. The nano-cellulose FeO@LENT/PVA composite can be effectively desorb dyes by 0.1 M NaOH. The nanocellulose FeO@LENT/PVA composite proves to be an effective adsorbent showing regeneration ability upto five times for all the dyes.
该研究着重于合成一种由兵豆壳和聚乙烯醇衍生的环保型纤维素基磁性纳米复合材料（FeO@LENT/PVA），用于吸附结晶紫、亚甲基蓝和孔雀石绿染料。通过扫描电子显微镜-能谱分析（SEM-EDAX）和傅里叶变换红外光谱（FTIR）确定其结构和功能形态。通过X射线衍射（XRD）分析FeO@LENT/PVA的结晶度，通过比表面积分析仪（BET）测定孔径。发现纳米纤维素FeO@LENT/PVA的表面积为22.308 m²/g，孔体积为0.074 cm³/g。FeO@LENT/PVA纳米复合材料在平衡时间120分钟内，分别在pH值为7（针对结晶紫）、8（针对亚甲基蓝和孔雀石绿）时成功吸附了结晶紫、亚甲基蓝和孔雀石绿。FeO@LENT/PVA纳米复合材料最符合朗缪尔等温线，并遵循以颗粒内扩散为速率控制机制的准二级动力学。纳米纤维素FeO@LENT/PVA复合材料表现出良好的单层吸附容量，顺序为结晶紫（357 mg/g）＞亚甲基蓝（112.35 mg/g）＞孔雀石绿（111.11 mg/g）。热力学研究表明该过程是吸热且自发的，在各自温度下ΔG值小于20 KJ/mol，表明为物理吸附。纳米纤维素FeO@LENT/PVA复合材料可用0.1 M氢氧化钠有效地解吸染料。纳米纤维素FeO@LENT/PVA复合材料被证明是一种有效的吸附剂，对所有染料均显示出高达五次的再生能力。
