The Santa Barbara Amorphous-15-guar gum--poly (acrylic acid)/cobalt ferrite (SBA-15-GG--PAA/CoFeO) mesoporous adsorbent was prepared by graft copolymerization of acrylic acid (AA) onto guar gum (GG) in the Santa Barbara Amorphous-15 (SBA-15) substrate presence, followed by incorporating CoFeO magnetic nanoparticles (MNPs). Diverse analyses were conducted to identify the prepared mesoporous adsorbent’s chemical and morphological properties, thermal resistance, magnetic characteristics, surface area, and porosity. Based on the magnetic hysteresis loops, the mesoporous adsorbent rendered ferromagnetic behavior. According to TGA, it has char yields of 72 wt% at 800 °C and superparamagnetic behavior (Ms of 3.22 emu.g). The crystalline structure and cubic phases of CoFeO MNPs in the GG--PAA amorphous matrix were demonstrated by XRD. The CoFeO MNP formation with partial aggregations onto smooth, nonporous, and regular surfaces of the GG was depicted by FESEM images. Also, the precisely-arranged hexagonal structure with cylindrical pores of SBA-15 was authenticated by FESEM images. Additionally, the SBA-15 substrate has increased the BET surface area of the prepared mesoporous adsorbent to 40.55 m/g, which is higher than the composite without SBA-15 mesoporous silica. Several experimental setups were used to evaluate the effectiveness of adsorption, including pH of the medium (4–9), Adsorbent dosage (0.003–0.02 g), Interaction time (1–25 min), and Initial pollutant concentration (50–400 mg/L). Using 0.003 g of mesoporous adsorbent at 25 °C, chlorpyrifos (CPF) and malachite green (MG) had maximum adsorption capacities (Qmax) of 909.1 mg/g and 1000.0 mg/g, respectively. In this study, the Langmuir isotherm model fitted the adsorption data perfectly with = 0.9987 and = 0.9994, and the pseudo-second-order model explained the adsorption kinetics with = 0.9644 and = 0.9923. MG and CPF adsorption to the SBA-15-GG--PAA/CoFeO mesoporous adsorbent was successful due to hydrogen bonds, exchange interactions, diffusion, and entrapment in the hydrogel network. In addition to the three-dimensional structure, the mesoporous adsorbent has available adsorption sites for reactive molecules. The reusability of the SBA-15-GG--PAA/CoFeO was perused and showed that the mesoporous adsorbent can be separated efficiently and retrieved in three sequential cycles without considerable diminution in the adsorption efficiency.

中文翻译：

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采用 SBA-15 掺入瓜尔豆胶接枝聚丙烯酸/铁酸钴基质对毒死蜱和孔雀石绿进行水净化的高效修复

采用丙烯酸（AA）接枝瓜尔胶（GG）制备Santa Barbara Amorphous-15-瓜尔胶-聚丙烯酸/铁酸钴（SBA-15-GG--PAA/CoFeO）介孔吸附剂在 Santa Barbara Amorphous-15 (SBA-15) 基底存在下，然后掺入 CoFeO 磁性纳米颗粒 (MNP)。进行了多种分析以确定所制备的介孔吸附剂的化学和形态特性、耐热性、磁性特性、表面积和孔隙率。基于磁滞回线，介孔吸附剂呈现铁磁行为。根据 TGA，它在 800 °C 时的炭产率为 72 wt%，并且具有超顺磁性（Ms 为 3.22 emu.g）。通过 XRD 证明了 GG--PAA 非晶基体中 CoFeO MNP 的晶体结构和立方相。 FESEM 图像描绘了 CoFeO MNP 的形成，部分聚集在光滑、无孔和规则的 GG 表面上。此外，SBA-15 具有圆柱形孔的精确排列的六边形结构也通过 FESEM 图像得到了证实。此外，SBA-15基质将所制备的介孔吸附剂的BET表面积增加至40.55 m/g，这高于不含SBA-15介孔二氧化硅的复合材料。使用几种实验装置来评估吸附的有效性，包括介质的 pH 值 (4–9)、吸附剂剂量 (0.003–0.02 g)、相互作用时间 (1–25 分钟) 和初始污染物浓度 (50–400 mg) /L）。在25℃下使用0.003g介孔吸附剂时，毒死蜱（CPF）和孔雀石绿（MG）的最大吸附容量（Qmax）分别为909.1mg/g和1000.0mg/g。本研究中，Langmuir 等温线模型以 = 0.9987 和 = 0.9994 完美拟合吸附数据，伪二阶模型以 = 0.9644 和 = 0.9923 解释了吸附动力学。由于水凝胶网络中的氢键、交换相互作用、扩散和截留，MG 和 CPF 成功吸附到 SBA-15-GG--PAA/CoFeO 介孔吸附剂上。除了三维结构外，介孔吸附剂还具有反应分子可用的吸附位点。仔细研究了 SBA-15-GG--PAA/CoFeO 的可重复使用性，结果表明介孔吸附剂可以在三个连续循环中有效分离和回收，而吸附效率不会显着降低。