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Characterization valorized anthracite and its application in manganese (VII) adsorption from aqueous solution; batch and column studies
Microporous and Mesoporous Materials ( IF 4.8 ) Pub Date : 2020-09-20 , DOI: 10.1016/j.micromeso.2020.110641
M.R. El-Aassar , F.M. Mohamed

The current study spotlights the modification of Anthracite (An) by microwave beam to form modified anthracite (MAn). The precursor (An) and modified anthracite (MAn) were investigated and characterized by several techniques such as XRD-EDAX, TGA, DSC, SEM, Raman spectra and BET surface area (SBET). The Mn (VII) isotherm notification was illustrated by a Langmuir model (R2 = 0.999) and the maximum monolayer coverage (QO) 555.5 mg/g that approved the surface symmetry of the modified anthracite. Whereas, The Mn (VII) kinetic knowledge was designated by the pseudo-second-order equation as specified by the high determination coefficient (R2 = 0.99342). The thermodynamic parameters (ΔH⁰, ΔS⁰, and ΔG⁰) were determined and their values indicate that the sorption of Mn (VII) on (MAn) is endothermic and spontaneous processes as well as physisorption on the surfaces of MAn. Moreover, in the dynamic mode, the adsorption capacity Ts was 58.6 mg/g or 114 mg, finally, the column recycled at least five times using H2SO4 (1 M) for each regeneration without considerable loss in sorbent mass. Therefore, MAn is estimated as a better Alternative technique for the elimination of Mn (VII) owing to a low quotation and high efficacy in this implementation.



中文翻译:

增值无烟煤的表征及其在水溶液中吸附锰(VII)中的应用;批次和列研究

当前的研究聚焦于微波束对无烟煤(An)的改性以形成改性无烟煤(MAn)。通过多种技术,例如XRD-EDAX,TGA,DSC,SEM,拉曼光谱和BET表面积(S BET),对前体(An)和改性无烟煤(MAn)进行了研究和表征。Mn(VII)等温线通知通过Langmuir模型(R 2  = 0.999)和最大单层覆盖率(Q O)555.5 mg / g证明了改性无烟煤的表面对称性。Mn(VII)动力学知识由高确定系数(R 2 = 0.99342)。测定了热力学参数(ΔH3,ΔS1和ΔG4),它们的值表明Mn(VII)在(MAn)上的吸附是吸热和自发过程以及在MAn表面上的物理吸附。此外,在动态模式下,吸附容量Ts为58.6 mg / g或114 mg,最后,对于每次再生,该柱使用H 2 SO 4(1 M)至少循环了五次,而吸附剂质量没有明显损失。因此,由于该实施中的低报价和高功效,MAn被认为是消除Mn(VII)的更好的替代技术。

更新日期:2020-09-29
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