Department of Chemistry, Faculty of Science, Al-Azhar University, Assiut, 71524, Egypt.
Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt.
Sci Rep. 2022 Sep 15;12(1):15499. doi: 10.1038/s41598-022-19570-1.
The jeopardy of the synthetic dyes effluents on human health and the environment has swiftly aggravated, threatening human survival. Hence, sustained studies have figured out the most acceptable way to eliminate this poisonous contaminant. Thereby, our investigation aimed to fabricate montmorillonite/magnetic NiFeO@amine-functionalized chitosan (MMT-mAmCs) composite as a promising green adsorbent to remove the cationic methylene blue (MB) and crystal violet (CV) dyes from the wastewater in neutral conditions. Interestingly, MMT-mAmCs composite carries high negative charges at a wide pH range from 4 to 11 as clarified from zeta potential measurements, asserting its suitability to adsorb the cationic contaminants. In addition, the experimental study confirmed that the optimum pH to adsorb both MB and CV was pH 7, inferring the ability of MMT-mAmCs to adsorb both cationic dyes in simple process conditions. Furthermore, the ferromagnetic behavior of the MMT-mAmCs composite is additional merit to our adsorbent that provides facile, fast, and flawless separation. Notably, the as-fabricated composite revealed an auspicious adsorbability towards the adsorptive removal of MB and CV, since the maximum adsorption capacity of MB and CV were 137 and 118 mg/g, respectively. Moreover, the isotherm and kinetic investigatins depicted that the adsorption of both cationic dyes fitted Langmuir and Pseudo 2nd order models, respectively. Besides, the advanced adsorbent preserved satisfactory adsorption characteristics with maximal removal efficacy exceeding 87% after reuse for ten consecutive cycles. More importantly, MMT-mAmCs efficiently adsorbed MB and CV from real agricultural water, Nile river water and wastewater samples at the neutral pH medium, reflecting its potentiality to be a superb reusable candidate for adsorptive removal cationic pollutants from their aquatic media.
合成染料废水对人类健康和环境的危害迅速加剧，威胁着人类的生存。因此，人们一直在研究最可行的方法来消除这种有毒污染物。因此，我们的研究旨在制备蒙脱石/磁性 NiFeO@胺功能化壳聚糖（MMT-mAmCs）复合材料，作为一种很有前途的绿色吸附剂，用于在中性条件下去除废水中的阳离子亚甲基蓝（MB）和结晶紫（CV）染料。有趣的是，从zeta 电位测量结果可以清楚地看出，MMT-mAmCs 复合材料在从 4 到 11 的宽 pH 范围内带有高负电荷，表明其适合吸附阳离子污染物。此外，实验研究证实，吸附 MB 和 CV 的最佳 pH 值为 7，这表明 MMT-mAmCs 能够在简单的工艺条件下吸附两种阳离子染料。此外，MMT-mAmCs 复合材料的铁磁性是我们吸附剂的另一个优点，它提供了简便、快速和无瑕疵的分离。值得注意的是，所制备的复合材料对 MB 和 CV 的吸附去除表现出良好的吸附性能，因为 MB 和 CV 的最大吸附容量分别为 137 和 118mg/g。此外，等温线和动力学研究表明，两种阳离子染料的吸附均符合 Langmuir 和 Pseudo 2 级模型。此外，该先进的吸附剂在重复使用十次后仍保持良好的吸附特性，最大去除效率超过 87%。更重要的是，MMT-mAmCs 在中性 pH 介质中从实际农业用水、尼罗河河水和废水样品中有效地吸附 MB 和 CV，反映了其作为从水介质中吸附去除阳离子污染物的优秀可重复使用候选物的潜力。
