Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz 5166616471, Iran.
Department of Food Science, College of Agriculture, University of Tabriz, Tabriz 5166616471, Iran.
Molecules. 2021 Apr 13;26(8):2241. doi: 10.3390/molecules26082241.
Activated carbon prepared from lemon () wood (ACL) and ACL/FeO magnetic nanocomposite were effectively used to remove the cationic dye of crystal violet (CV) from aqueous solutions. The results showed that FeO nanoparticles were successfully placed in the structure of ACL and the produced nanocomposites showed superior magnetic properties. It was found that pH was the most effective parameter in the CV dye adsorption and pH of 9 gave the maximum adsorption efficiency of 93.5% and 98.3% for ACL and ACL/FeO, respectively. The Dubinin-Radushkevich (D-R) and Langmuir models were selected to investigate the CV dye adsorption equilibrium behavior for ACL and ACL/FeO, respectively. A maximum adsorption capacity of 23.6 and 35.3 mg/g was obtained for ACL and ACL/FeO, respectively indicating superior adsorption capacity of FeO nanoparticles. The kinetic data of the adsorption process followed the pseudo-second order (PSO) kinetic model, indicating that chemical mechanisms may have an effect on the CV dye adsorption. The negative values obtained for Gibb's free energy parameter (-20 < ΔG < 0 kJ/mol) showed that the adsorption process using both types of the adsorbents was physical. Moreover, the CV dye adsorption enthalpy (ΔH) values of -45.4 for ACL and -56.9 kJ/mol for ACL/FeO were obtained indicating that the adsorption process was exothermic. Overall, ACL and ACL/FeO magnetic nanocomposites provide a novel and effective type of adsorbents to remove CV dye from the aqueous solutions.
从柠檬（Citrus limon）木材（ACL）和 ACL/FeO 磁性纳米复合材料中制备的活性炭有效地用于从水溶液中去除阳离子染料结晶紫（CV）。结果表明，成功地将 FeO 纳米颗粒放置在 ACL 的结构中，所制备的纳米复合材料表现出优异的磁性。发现 pH 是 CV 染料吸附的最有效参数，pH 值为 9 时，ACL 和 ACL/FeO 的最大吸附效率分别为 93.5%和 98.3%。分别选用 Dubinin-Radushkevich（D-R）和 Langmuir 模型研究 ACL 和 ACL/FeO 对 CV 染料吸附平衡行为的影响。ACL 和 ACL/FeO 的最大吸附容量分别为 23.6 和 35.3mg/g，表明 FeO 纳米颗粒具有优异的吸附能力。吸附过程的动力学数据符合准二级（PSO）动力学模型，表明化学机制可能对 CV 染料吸附有影响。吸附吉布斯自由能参数（-20<ΔG<0kJ/mol）的负值表明，两种吸附剂的吸附过程都是物理的。此外，ACL 和 ACL/FeO 的 CV 染料吸附焓（ΔH）值分别为-45.4kJ/mol 和-56.9kJ/mol，表明吸附过程是放热的。总的来说，ACL 和 ACL/FeO 磁性纳米复合材料为从水溶液中去除 CV 染料提供了一种新颖有效的吸附剂。
