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Experimental and DFT investigation of ceria-nanocomposite decorated AC derived from groundnut shell for efficient removal of methylene-blue from wastewater effluent

机译:基于地生壳的二氧化纳米复合材料的实验性和DFT调查源自壳体壳,以便于废水流出物中高效除去亚甲基 - 蓝

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Removal of dyes is a significant aspect of environmental remediation to ensure clean water and atmosphere. In this study, we report an incorporation of nano ceria at different weight loadings via solid state impregnation on the highly porous activated carbon (AC) derived from groundnut shell to form nano-ceria decorated AC for effective removal of cationic dye (methylene blue). The adsorption capacity of MB within a short period is highly remarkable with 199.76 mg/g, corresponding to 99.9% efficiency in 400 ppm using 40 mg weight adsorbent. The adsorbent at relatively low loadings (0.5-1%) of nano-ceria of AC favors significantly adsorption of MB, owing to the high degree of dispersion of cerium with improved textural properties, acidity and surface chemistry. The adsorbents were characterized by the N-2-sorption, spectroscopies; (XRD, FTIR and Raman), microscopies (SEM and TEM) and temperature programmed desorption (TPD) techniques. The isotherm and kinetics information reveals that the adsorption mechanism of MB is elucidated by the Langmuir and pseudosecond order models, respectively. Quantum chemical DFT calculations revealed that ceria incorporation lowers the HOMO-LUMO energy gap (Delta E), increases the chemical softness and enhances the adsorption capacity of AC with a theoretical adsorption energy of -18.5 kcal/mol.
机译:除去染料是环境修复的重要方面,以确保清洁水和大气。在该研究中,我们通过固体状态浸渍在衍生自从地下壳壳中的高孔活化碳(Ac)上以形成纳米纤维装饰AC的高度多孔活化碳(AC)掺入纳米二氧化铈,以有效去除阳离子染料(亚甲基蓝色)。短期内MB的吸附容量非常显着,199.76mg / g非常显着,使用40mg重量吸附剂400ppm的效率为99.9%。由于铈具有改善的纹理性质,酸度和表面化学的高度分散,因此AC的纳米纳米纳米纳米纳米纳米纳米纳米纳米纳米纳米纳米的吸附剂显着吸附MB。吸附剂的特征在于N-2吸附,光谱; (XRD,FTIR和拉曼),显微镜(SEM和TEM)和温度编程解吸(TPD)技术。等温线和动力学信息表明,Mb的吸附机理分别由Langmuir和伪阶阶模型阐明。量子化学DFT计算表明,Ceria掺入降低了Homo-Lumo能量隙(Delta E),增加了化学柔软度,并提高了AC的吸附能力,具有-18.5 kcal / mol的理论吸附能。

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