Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 776, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.145973
Keywords
Graphene; Poly(amino-phosphonic acid); Aerogel; Water purification; Cr(III) and MB removal; Oils and solvents absorption
Categories
Funding
- National Natural Science Foundation of China [51978384, 21978226]
- Research Foundation of Education Bureau of Hubei Province [B2020069]
- open research funds of Hubei key Laboratory of Novel Reactor and Green Chemical Technology [40201006]
- Hubei Key Laboratory of Biomass Fibers and Ecodyeing Finishing [STRZ2020007]
- National Engineering Research Center of Phosphorus Resource Exploitation [202006]
- Central Committee Guides Local Science and Technology Development Special Project of Hubei Province [2019ZYYD073]
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Novel 3D reduced graphene oxide/poly(amino-phosphonic acid) aerogels were developed for versatile adsorption of complex pollutants from water, showing fast adsorption rate and high capacity for Cr(III) ion. The aerogels displayed excellent adsorption performance for methylene blue and various organic solvents, with good regeneration and recovery abilities for the adsorbates, suggesting great prospects for industrial wastewater cleanup.
The fabrication of multifunctional materials to remove soluble heavy metal ions and dyes, as well as insoluble oils from waste water is urgently required, yet remains a daunting challenge because of difficulty in controlling their structure and property to satisfy various demands. Herein, for the first time, novel 3D reduced graphene oxide/ poly(amino-phosphonic acid) (PAPA) aerogels (rGO/PAPAs) with different PAPA content were developed by solvothermal reduction of the graphene oxide and cross-linking with PAPA chain, and subsequently employed as versatile adsorbent for the removal of complex pollutants such as Cr(III) ion, methylene blue (MB) dye and various kinds of organic solvents from water. Benefiting from the synergistic effect of the reduced graphene oxide (rGO) sheet and PAPA component, as well as its unique 3D structure, the resultant aerogel (rGO/PAPA2) gained amphiphilic, ultralight, and multifunctional properties. Thus, it showed a fast adsorption rate (within 15 min) and high adsorption capacity (up to 327.1 mg/g) for Cr(III) ion at an optimal pH of 5.5 due to its unique 3D network structure with abundant amino-phosphonic acid functional groups. The uptake of Cr(III) by rGO/ PAPA-2 was fitted well with the Langmuir isotherm and pseudo-second-order kinetic model. The adsorption mechanism of Cr(III) onto rGO/PAPA-2 can be attributed to electrostatic attraction and surface complexation with APA groups. In addition, the rGO/PAPA-2 displayed an excellent adsorption performance for MB (694.5 mg/g) and several organic solvents (83.2 to 254.3 g/g). Moreover, the rGO/PAPA-2 exhibited a good regeneration (around 99%) and satisfactory recovery abilities for the tested adsorbates. Notably, PAPA chains can be easily prepared from waste acrylic fibers, making it become a cost effective but versatile candidate to prepare new material. Therefore, this work provides a new design strategy to fabricate the rGO/PAPA-2 aerogel with great prospect for sophisticated industrial wastewater cleanup. (c) 2021 Elsevier B.V. All rights reserved.
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