Abstract
In this work, a series of polyphenol porous polymers were derived from biomass polyphenols via a facile azo-coupling method. The structure and morphologies of the polymer were characterized by BET, TEM, SEM, XRD, TGA and FT-IR techniques. Batch experiments demonstrated their potentialities for adsorptive separation of Cs+ from aqueous solution. Among them, porous polymers prepared with gallic acid as starting material (GAPP) could adsorb Cs+ at wide pH value range effectively, and the optimal adsorption capacity was up to 163.6 mg/g, placing it at top material for Cs+ adsorption. GAPP exhibited significantly high adsorption performance toward Cs+ compared to Na+ and K+, making it possible in selective removal of Cs+ from ground water in presence of co-existing competitive ions. Moreover, the Cs-laden GAPP could be facilely eluted and reused in consecutive adsorption-desorption processes. As a result, we hope this work could provide ideas about the potential utilization of biomass polyphenol in environmental remediation.
Highlights
Growing concern about the remediation of radioactive waste generated from nuclear power plants and unforeseen accidents have been given worldwide for the sake of human health and environmental issues[1,2,3,4]
Due to the porous structures functionalized by biomass polyphenols, the gallic acid-based porous polymer (GAPP) exhibited exceptionally adsorption performance for Cs+ (163.6 mg/g)
Further SEM (Fig. 1c) and transmission electron microscopy (TEM) (Fig. 1d) images confirmed the porosity of GAPP, which was agreed with the results from N2 adsorption
Summary
Growing concern about the remediation of radioactive waste generated from nuclear power plants and unforeseen accidents have been given worldwide for the sake of human health and environmental issues[1,2,3,4]. Prussian blue (PB) analogues[12,13], titanate nanomaterials[14], metal oxides and sulfides[15], natural zeolites[16], ammonium molybdophosphate[17,18] and other adsorbents[19] were developed and used for the removal of Cs+ from radioactive effluents They still suffered from several problems, such as considerable preparation cost, unsatisfactory adsorption performance and insufficient stability, majority of the adsorbents aforementioned were not environmental friendly, economically and industrially attractive. Due to the porous structures functionalized by biomass polyphenols, the gallic acid-based porous polymer (GAPP) exhibited exceptionally adsorption performance for Cs+ (163.6 mg/g) This low-cost and environmentally friendly GAPP was robust in either acidic or basic solution (pH value range 2–12), and showed stable performance in consecutive adsorption-desorption experiments
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