Designer composite of montmorillonite-reduced graphene oxide-PEG polymer for water treatment: Enrofloxacin sequestration and cost analysis

被引：48
作者：
Akpotu, Samson O. [1 ]
Diagboya, Paul N. [2 ,3 ]
Lawal, Isiaka A. [1 ]
Sanni, Saheed O. [1 ]
Pholosi, Agnes [1 ]
Peleyeju, Moses G. [1 ]
Mtunzi, Fanyana M. [2 ]
Ofomaja, Augustine E. [1 ]
机构：
[1] Vaal Univ Technol, Dept Biotechnol & Chem, Wastewater Treatment Res Lab, ZA-1911 Vanderbijlpark, Gauteng, South Africa
[2] Vaal Univ Technol, Dept Biotechnol & Chem, Environm Fate Chem & Remediat Lab, ZA-1911 Vanderbijlpark, Gauteng, South Africa
[3] Justus Liebig Univ, Inst Soil Sci & Soil Conservat, Giessen, Germany
来源：
CHEMICAL ENGINEERING JOURNAL | 2023年 / 453卷
基金：
新加坡国家研究基金会;
关键词：
Adsorption; Polyethylene glycol; Clay; Graphene; Emerging contaminants; AQUEOUS-SOLUTION; ADSORPTION; REMOVAL; ADSORBENT; ANTIBIOTICS; REMEDIATION; SORPTION;
D O I：
10.1016/j.cej.2022.139771
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Synergistically combining lower performing adsorbents may effectively enhance the composite's aqueous contaminant uptake and reduce water treatment cost. Hence in this study, Montmorillonite (Mont) was coupled to graphene oxide (GO)/reduced GO (rGO), and covalently bonded to polyethylene glycol methyl ether (PEG) using a scalable facile amidation method to produce the designer composite. This was employed for the sequestration of an aqueous emerging contaminant (enrofloxacin). Characterization showed attachment of thin GO-PEG films on the surface of Mont, with marked differences in elemental constitution and functionalities post-preparation. Enrofloxacin adsorption equilibrium was fast and optimal at <= 30 min and pH 6, respectively, while the data fitted the pseudo-second order and Langmuir models with maximum adsorption of 310.6 mg/g. Reuse and cost analysis of the composite showed effective optimal reuse (>= 72 %) in real/simulated water samples after 4 adsorption-desorption cycles, while the clay-polymer composite was significantly a cheaper adsorbent with higher adsorption efficiency than other conventional adsorbents.
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页数：10
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