Herein, a novel and eco-friendly low-cost adsorbent polyacrylamide-grafted Actinidia deliciosa (Kiwi fruit) peels powder (PGADP) was synthesized and utilized as a potential adsorbent for the sequestration of crystal violet (CV) dye from aqueous solution. The material was characterized by various analytical techniques such as Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray diffractometer (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The adsorption process was carried out in a batch process with different concentrations, adsorbent doses, pH, contact time and temperatures. The maximum adsorption of CV dye from aqueous solution was observed at pH 7.3, contact time 180 min and initial dye concentration 20 mgL⁻¹. The equilibrium data were tested by applying various isotherms models such as Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (D-R), and the results showed that Langmuir was found to be the best fitted model based on the highest correlation coefficient (R²). Kinetic data showed that pseudo-second order model was best obeyed over wide range of concentrations. In thermodynamic study, positive value of ∆H^o and negative value of ΔG° confirm endothermic and spontaneous nature of adsorption process with increased randomness at solid-solution interface. Desorption of CV dye was performed successfully using 1 M acetic acid with excellent regenerating capacity that lasts up to fourth cycle. Therefore, PGADP can be used effectively and economically for removal of CV dye from aqueous solution and industrial waste water.

中文翻译：

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聚丙烯酰胺接枝的猕猴桃果皮粉（PGADP）用于隔离结晶紫染料：等温线，动力学和热力学研究

在这里，合成了一种新型的，环保的低成本吸附聚丙烯酰胺接枝的猕猴桃果皮粉（PGADP），并被用作从水溶液中螯合结晶紫（CV）染料的潜在吸附剂。该材料通过各种分析技术进行了表征，例如傅立叶变换红外光谱（FTIR），热重分析（TGA），X射线衍射仪（XRD），扫描电子显微镜（SEM）和透射电子显微镜（TEM）。吸附过程以不同的浓度，吸附剂剂量，pH，接触时间和温度分批进行。在pH 7.3，接触时间180分钟和初始染料浓度20 mgL ^-1下观察到CV染料从水溶液中的最大吸附。通过应用各种等温线模型（例如Langmuir，Freundlich，Temkin和Dubinin–Radushkevich（DR））测试平衡数据，结果表明，基于最高相关系数（R ²），发现Langmuir是最佳拟合模型。动力学数据表明，在较宽的浓度范围内，最好遵循伪二级模型。在热力学的研究中，ΔH的正值^Ó和Δ的负值ģ°确认吸附过程的吸热和自发性质，固溶界面处的随机性增加。使用具有出色再生能力的1 M乙酸成功地进行了CV染料的脱附，该再生能力可持续至第四周期。因此，PGADP可以有效，经济地用于从水溶液和工业废水中去除CV染料。