Methylene blue (a cationic dye) adsorption performance of graphene oxide fabricated Fe-Al bimetal oxide composite from water

IF 2.4 4区环境科学与生态学 Q2 WATER RESOURCES

Water Quality Research Journal Pub Date : 2018-10-10 DOI:10.2166/WQRJ.2018.017

Shaheriar Haque, S. Gain, K. Gupta, U. C. Ghosh

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引用次数: 5

Abstract

Graphene oxide (GO) fabricated iron-aluminium oxide (GO@IAO) nanocomposite was synthesized with one-spot chemical reaction from emulsification of GO (1.0 g) in 0.2 L of 1.0 M mixed metal solution, which was characterized with some of the latest analytical tools aiming to assess methylene blue (MB) adsorption performance from aqueous solutions. Adsorption of MB on GO@IAO surfaces shows a steep increase from pH 3.0 to 5.0, but steepness declines at pH >5.0. The closeness of fitted kinetic data with the pseudo-second order (PSO) equation (R2 = 0.9845) compared to the pseudo-first order equation (R2 = 0.9527) confirms the adsorption process is of the PSO type. The MB adsorption equilibrium data can be described better by the Langmuir isotherm (R2 = 0.99) than the Freundlich isotherm (R2 = 0.96–0.97), inclining to the monolayer adsorption process. The Langmuir adsorption capacity of GO@IAO has been estimated to be 330.35 mg/g at 303 K. The MB adsorption is established to be spontaneous (–ΔG0 = 26.31–26.61 kJ/mol) owing to favourable enthalpy and entropy changes (ΔH0 = –23.38 kJ/mol; ΔS0= 0.01 kJ/mol/K). Both absolute and aqueous (1/1, v/v) alcohols regenerate the MB adsorbed GO@IAO up to 80–85%, indicating recyclability of composite.

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氧化石墨烯制备的Fe-Al双金属氧化物复合材料对水中亚甲基蓝(阳离子染料)的吸附性能

石墨烯氧化物（GO）制造的铁氧化铝(GO@IAO)将GO（1.0g）在0.2L的1.0M混合金属溶液中乳化，通过一点化学反应合成了纳米复合材料，并用一些最新的分析工具对其进行了表征，旨在评估亚甲蓝（MB）在水溶液中的吸附性能。MB在GO@IAO表面显示出从pH 3.0到5.0的急剧增加，但在pH＞5.0时陡度下降。与伪一阶方程（R2=0.9527）相比，具有伪二阶（PSO）方程（R2=0.09845）的拟合动力学数据的接近性证实了吸附过程是PSO类型的。Langmuir等温线（R2=0.99）比Freundlich等温线（R2=0.096–0.97）更好地描述了MB的吸附平衡数据，倾向于单层吸附过程。Langmuir吸附容量GO@IAO估计在303 K时为330.35 mg/g。由于有利的焓和熵变化（ΔH0=–23.38 kJ/mol；ΔS0=0.01 kJ/mol/K），MB吸附被确定为自发的（–ΔG0=26.31–26.61 kJ/mol）。无水和水性（1/1，v/v）醇都能再生吸附的MBGO@IAO高达80–85%，表明复合材料的可回收性。

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来源期刊

Water Quality Research Journal WATER RESOURCES-

CiteScore

4.50

自引率

8.70%

发文量