如今,天然材料的使用,特别是“废物”的价值化已经演变并引起了科学家和学术界的广泛关注。在这方面,使用稻壳(RH)粉末作为天然丰富且廉价的副产品材料正在获得极大的关注。然而,改善这种RH的物理化学性质仍在研究中。在目前的调查中,通过γ辐照对稻壳(RH)进行改性已被证明是满足这种需求的有前途的绿色工具。干净,准备好了,粉状RH样品经受各种γ辐射剂量,即5、10、15和25kGy,分别命名为RH-0、RH-5、RH-10、RH-15、RH-15和RH-25。然后,通过扫描电子显微镜(SEM)对样品进行表征。辐照后,当γ辐射增加到15kGy时,样品的表面粗糙度增加。此外,研究了辐照的RH样品的吸附能力,以消除Urolene蓝(UB)染料作为模型药物流出物流。最高的染料吸收记录为14.7mg/g,对应于RH-15。还研究了所有研究系统的吸附操作参数,所有吸附剂均显示出相同的趋势,在pH6.6和高温下具有优异的吸附能力。Langmuir和Freundlich等温线模型也用于UB吸附,并且适当的拟合等温线模型与Langmuir拟合相关联。此外,伪二级动力学模型为吸附数据提供了最佳拟合。实验测定证实UB染料可以通过可持续的绿色方法从水流中成功地根除。
Nowadays, the use of natural materials and especially \"waste\" valorization has evolved and attracted the wide attention of scientists and academia. In this regard, the use of rice husk (RH) powder as a naturally abundant and cheap byproduct material is gaining superior attention. However, improving the physicochemical properties of such RH is still under research. In the current investigation, the modification of rice husk (RH) via γ-irradiation has shown to be a promising green tool to meet such a need. Clean, prepared, powdered RH samples were subjected to various γ-radiation doses, namely 5, 10, 15 and 25 kGy, and the corresponding samples were named as RH-0, RH-5, RH-10, RH-15, RH-15 and RH-25. Then, the samples were characterized via scanning electron microscopy (SEM). After irradiation, the samples showed an increase in their surface roughness upon increasing the γ-radiation up to 15 kGy. Furthermore, the sorption capacity of the irradiated RH samples was investigated for eliminating Urolene Blue (UB) dye as a model pharmaceutical effluent stream. The highest dye uptake was recorded as 14.7 mg/g, which corresponded to the RH-15. The adsorption operating parameters were also investigated for all of the studied systems and all adsorbents showed the same trend, of a superior adsorption capacity at pH 6.6 and high temperatures. Langmuir and Freundlich isotherm models were also applied for UB adsorption and an adequate fitted isotherm model was linked with Langmuir fitting. Moreover, the pseudo-second-order kinetic model provided the best fit for the adsorption data. Experimental assays confirmed that the UB dye could be successfully eradicated feasibly from the aqueous stream via a sustainable green methodology.