过去几十年来最热门的研究课题之一是将农业工业废物增值或/和再循环到不同的有价值的液体或固体产品中。这被认为是一种可持续和低成本的方法。在这项研究中,我们使用绿色和直接的方法从棕榈提取物(P-NZVI)中开发了零价铁纳米颗粒。合成的P-NZVI用于吸附水中的Cr(VI)。P-NZVI的物理化学特征,包括颗粒大小,晶体结构,表面积,形态学,和功能组,通过紫外-可见光谱等几种技术进行了研究,SEM,TEM,XRD,FTIR,AFM,DLS,pHZPC测量,和BET分析。研究了P-NZVI在不同操作参数下的吸附性能,包括污染物浓度,pH值,温度,和吸附剂质量。40min内吸附率为89.3%,在以下条件下,相应的吸附容量为44.47mg/g:初始Cr(VI)浓度为40mg/L,pH为5,P-NZVI用量为1g/L。发现吸附模式遵循Langmuir和伪二级动力学模型,表明单层吸附和化学吸附机制的组合。热力学研究表明,吸附过程是吸热和自发的。P-NZVI的可重用性进行了四次,显示从89.3%到87%略有下降。这些发现强调了P-NZVI可以是一种有效的绿色吸附剂,用于去除水中的Cr(VI)或其他类型的有毒污染物。
One of the hottest research topics over the last decades was the valorization or/and recycling of agro-industrial wastes into different valuable liquid or solid products, which is considered a sustainable and low-cost approach. In this study, we developed zero-valent iron nanoparticles from Palm Petiole Extract (P-NZVI) using a green and straightforward approach. The as-synthesized P-NZVI was used to adsorb Cr(VI) in water. The physico-chemical characterizations of P-NZVI, including the particle size, crystalline structure, surface area, morphology, and functional groups, were investigated via several techniques such as UV-vis spectroscopy, SEM, TEM, XRD, FTIR, AFM, DLS, pHZPC measurement, and BET analysis. The adsorption performance of P-NZVI was studied under different operational parameters, including pollutant concentration, pH, temperature, and adsorbent mass. The adsorption rate was found to be 89.3% within 40 min, corresponding to the adsorption capacity of 44.47 mg/g under the following conditions: initial Cr(VI) concentration of 40 mg/L, pH 5, and a P-NZVI dosage of 1 g/L. It was found that the adsorption pattern follows the Langmuir and the pseudo-second-order kinetic models, indicating a combination of monolayer adsorption and chemisorption mechanisms. The thermodynamic study shows that the adsorption process is endothermic and spontaneous. The reusability of P-NZVI was carried out four times, showing a slight decrease from 89.3 to 87%. These findings highlight that P-NZVI\'s could be an effective green adsorbent for removing Cr(VI) or other types of toxic pollutants from water.