The adsorption of fluorescein dye (FD) on wild herb microparticles (Juniperus (JH) and Solenostemma argel (Del) Hayne (SH)) was studied to elucidate the changes in adsorption behavior with various parameters, such as initial concentration, adsorbent dosage, pH, contact time, and temperature. It was determined that the adsorption percentage of JH for FD was as high as 85.5%, which was higher than that of SH (71.9%). The morphologies of JH and SH were analyzed using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) analyses. The JH and SH adsorbents contained different functional groups, which were involved in the binding of the FD molecules during adsorption. The XRD patterns of JH and SH confirmed the presence of a combination of amorphous and crystalline phases in their structures. The SEM images of the surface of JH revealed the presence of deep pores ranging in size from 1.9 to 3.5 μm, while SH contained smaller pores ranging in size from 130 to 350 μm, which could help absorb large quantities of FD. The Freundlich model fitted the adsorption isotherms better than the Langmuir model. The values of the Freundlich equilibrium coefficient and separation factor ranged from 1 to 2 and from 0 to 1, respectively. The maximum adsorption capacities of JH and SH were determined to be 2.91 and 2.565 mg/g, respectively. Four kinetic models were used to analyze the experimental data, and it was determined that the pseudo-second-order kinetic model best described the adsorption process, which involved chemical adsorption and the internal diffusion. Thermodynamic parameters, including the enthalpy, entropy, and Gibbs free energy, were calculated. These parameters indicated that the adsorption of FD on JH was spontaneous and endothermic and the adsorption of FD on SH was unspontaneous and exothermic.

中文翻译：

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使用野生草药从水溶液中吸附荧光素染料的研究。


研究了荧光素染料 (FD) 在野生药草微粒（杜松(JH) 和Solenostemma argel (Del) Hayne (SH)）上的吸附，以阐明吸附行为随各种参数（如初始浓度、吸附剂剂量、pH 值）的变化。 、接触时间和温度。测定JH对FD的吸附率高达85.5%，高于SH（71.9%）。使用傅里叶变换红外光谱 (FTIR)、X 射线衍射 (XRD) 和扫描电子显微镜 (SEM) 分析 JH 和 SH 的形貌。 JH和SH吸附剂含有不同的官能团，这些官能团在吸附过程中参与FD分子的结合。 JH 和 SH 的 XRD 图证实其结构中存在非晶相和结晶相的组合。 JH表面的SEM图像显示存在尺寸为1.9至3.5μm的深层孔隙，而SH包含尺寸为130至350μm的较小孔隙，这有助于吸收大量的FD。 Freundlich 模型比 Langmuir 模型更适合吸附等温线。 Freundlich 平衡系数和分离因子的值分别为 1 至 2 和 0 至 1。 JH和SH的最大吸附容量分别为2.91和2.565 mg/g。采用四种动力学模型对实验数据进行分析，确定准二级动力学模型最能描述吸附过程，其中涉及化学吸附和内部扩散。计算了热力学参数，包括焓、熵和吉布斯自由能。 这些参数表明FD在JH上的吸附是自发的、吸热的，而FD在SH上的吸附是非自发的、放热的。