红霉素(ERY)分子对环境是稳定的,并且由于它们的芳香结构而难以去除。如今,许多研究报告说,水中的ERY量高于标准水平,因此有必要将其去除。这里,我们制备了三种固体吸附剂:石墨碳氮化物(g-C3N4),卡拉胶钾珠(Cr),和石墨氮化碳/阿拉伯树胶/卡拉胶钾复合物(g-ACr)。几种技术,如XRD,SEM,TEM,TGA,ATR-FTIR,Zeta电位,和N2吸附用于表征制备的吸附剂。吸附剂剂量的五个基本因素,初始ERY浓度,接触时间,温度,并对pH进行了优化,考察了ERY的批量吸附。在吸附剂剂量为1.25g/L时,g-ACr复合材料的最大吸附容量为356.12mg/g,接触时间6小时,和pH7在15°C。数据表明,实验结果与Langmuir表现出最好的一致性,Temkin,和DR等温线模型,除了伪二阶动力学模型,埃洛维奇,和粒子内扩散。评估的热力学因素指定ERY吸附是吸热的,物理吸附,有利的,和自发的过程。g-ACr可重用性显示在7次吸附/解吸运行后吸附容量下降了5.7%。最后,这项工作成果描述了g-ACr复合材料是一种有效的可重复使用的吸附剂,可从废水中消除ERY。
Erythromycin (ERY) molecules are robust to the environment and hard to remove due to their aromatic structure. Nowadays, numerous researches have reported that the ERY amount in water is above the standard level and its removal is necessary. Here, we prepared three solid adsorbents: graphitic carbon nitride (g-C3N4), potassium carrageenan beads (Cr), and graphitic carbon nitride/gum Arabic/potassium carrageenan composite (g-ACr). Several techniques such as XRD, SEM, TEM, TGA, ATR-FTIR, Zeta potential, and N2 adsorption were employed to characterize the fabricated adsorbents. Five essential factors of adsorbent dose, initial ERY concentration, contact time, temperature, and pH were optimized to investigate the batch adsorption of ERY. The maximum adsorption capacity of 356.12 mg/g was attained by g-ACr composite at an adsorbent dose of 1.25 g/L, contact time of 6 h, and pH 7 at 15 °C. The data showed that the experimental findings exhibited the best agreement with Langmuir, Temkin, and DR isotherm models, in addition to the kinetic models of pseudo-second-order, Elovich, and intra-particle diffusion. The evaluated thermodynamic factors designated that the ERY adsorption is endothermic, physisorption, favorable, and spontaneous process. The g-ACr reusability displayed a decline in the adsorption capacity after seven adsorption/desorption runs by 5.7 %. Finally, this work outcomes depict that g-ACr composite is an efficient reusable adsorbent for ERY elimination from wastewater.