Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, 5166616471, Iran.
Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, 5166616471, Iran.
Environ Res. 2024 Dec 1;262(Pt 1):119825. doi: 10.1016/j.envres.2024.119825. Epub 2024 Aug 22.
In this study, we developed new adsorbents derived from orange peel biochar (BCOP) and enhanced them with CoFeO magnetic nanoparticles (BCOP/CoFeO) and MIL-53(Al) (BCOP/CoFeO/MIL-53(Al)). These adsorbents were utilized to remove fluoride (FL) ions from aqueous solutions. We analyzed the properties of these adsorbents using a range of techniques, including FTIR, XRD, SEM, EDX-Map, VSM, Raman spectroscopy, and BET. Our findings indicate that the components interact effectively with one another. Specifically, the BCOP/CoFeO/MIL-53(Al) sample exhibited a specific surface area of 196.430 m/g and a magnetic saturation value of 9.704 emu/g. The maximum FL ion adsorption capacities for BCOP, BCOP/CoFeO, and BCOP/CoFeO/MIL-53(Al) were 7.618, 16.330, and 37.320 mg/g, respectively, indicating that the modifications significantly enhanced the adsorption capacity. The optimum fluoride ion removal rates using BCOP, BCOP/CoFeO, and BCOP/CoFeO/MIL-53(Al) were 97.88%, 98.23%, and 99.06%, respectively, at adsorbent doses of 2.5, 1.5, and 0.8 g/L, contact times of 90, 70, and 50 min, pH 4, temperature 50 °C, and a FL concentration of 10 mg/L. Thermodynamic studies revealed that the adsorption process was spontaneous and endothermic, with increased randomness between the adsorbent and fluoride ions. Kinetic analyses showed that fluoride ion adsorption by BCOP/CoFeO/MIL-53(Al) followed a pseudo-second-order (PSO) model, while BCOP and BCOP/CoFeO followed a pseudo-first-order (PFO) model. Additionally, the equilibrium data for fluoride ion adsorption on BCOP/CoFeO/MIL-53(Al) adhered to the Freundlich model, whereas the other samples conformed to the Langmuir model. The study evaluates the effectiveness of BCOP, BCOP/CoFeO, and BCOP/CoFeO/MIL-53(Al) in removing FL ions from glass manufacturing wastewater, highlighting the superior performance of the magnetic composite due to its enhanced surface area and functional groups. Notably, the adsorbents demonstrated good regenerative capabilities, maintaining high performance over multiple adsorption cycles.
在这项研究中，我们开发了一种新的吸附剂，它是由橙皮生物炭（BCOP）衍生而来，并通过 CoFeO 磁性纳米粒子（BCOP/CoFeO）和 MIL-53（Al）（BCOP/CoFeO/MIL-53（Al））进行了增强。这些吸附剂被用于从水溶液中去除氟离子（FL）。我们使用一系列技术对这些吸附剂的性能进行了分析，包括傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）、扫描电子显微镜（SEM）、能谱仪（EDX-Map）、振动样品磁强计（VSM）、拉曼光谱和比表面积测试（BET）。我们的研究结果表明，这些成分之间相互作用良好。具体来说，BCOP/CoFeO/MIL-53（Al）样品的比表面积为 196.430 m/g，饱和磁化强度为 9.704 emu/g。BCOP、BCOP/CoFeO 和 BCOP/CoFeO/MIL-53（Al）的最大 FL 离子吸附容量分别为 7.618、16.330 和 37.320 mg/g，这表明修饰显著提高了吸附能力。BCOP、BCOP/CoFeO 和 BCOP/CoFeO/MIL-53（Al）在吸附剂用量为 2.5、1.5 和 0.8 g/L、接触时间为 90、70 和 50 min、pH 值为 4、温度为 50°C 和 FL 浓度为 10 mg/L 时，去除氟离子的最佳去除率分别为 97.88%、98.23%和 99.06%。热力学研究表明，吸附过程是自发的和吸热的，吸附剂和氟离子之间的无序度增加。动力学分析表明，BCOP/CoFeO/MIL-53（Al）对氟离子的吸附符合准二级（PSO）模型，而 BCOP 和 BCOP/CoFeO 符合准一级（PFO）模型。此外，BCOP/CoFeO/MIL-53（Al）上氟离子吸附的平衡数据符合 Freundlich 模型，而其他样品符合 Langmuir 模型。本研究评估了 BCOP、BCOP/CoFeO 和 BCOP/CoFeO/MIL-53（Al）在去除玻璃制造废水中 FL 离子方面的有效性，突出了磁性复合材料的优越性能，因为其具有增强的表面积和官能团。值得注意的是，吸附剂表现出良好的再生能力，在多个吸附循环中保持了高性能。
