Amidoximated orange peel as a specific uranium scavenger
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Amidoximated orange peel as a specific uranium scavenger Chenglei Fang1 · Qinqin Tao1 · Ying Dai1 Received: 28 July 2020 / Accepted: 29 September 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract Biomass waste is recognized as potential raw material for many adsorbents. In this study orange peel biochar (OP) was modified with amidoxime group. The consequent amidoximated orange peel biochar (OP-AO) was investigated to reveal potential for the removal of U(VI) from aqueous solution. Essential parameters for the adsorption such as pH, initial U(VI) concentration, adsorption time and temperature were determined. The SEM, FT-IR, XPS, BET analyses and Zeta potential test were used to characterize the structure of amidoximated biochar and the adsorption mechanisms. Kinetics, isotherms and thermodynamics were studied. The results showed that modification with amidoxime group improved the U(VI) adsorption capacity of the original biochar (Qmax (OP-AO) = 382.89 mg/g > Qmax (OP) = 155.44 mg/g). The obtained results showed that the used biochar is a promising adsorbent for the specific uranium separation. Keywords Amidoxime · U(VI) · Adsorption · Kinetics · Thermodynamics · Orange peel biochar
Introduction With merits of high-density energy and nearly zero greenhouse gas’s emissions, the nuclear power serves as an important energy resource worldwide [1]. To this day, uranium is the major ingredient for the most nuclear power stations. The booming growth in the demand of the nuclear energy is stimulating exploitation of uranium ores. The process of mining, metallurgy, and especially in situ leaching and disposing tailing of uranium ore often releases uranium nuclides in the formation of uranyl into the aqueous environment [2]. Furthermore, due to incredibly diffuse electrons in 5f orbital the element uranium is prone to coordinate with various ligands containing electron-donor atoms such as nitrogen, phosphorus, sulfur and oxygen etc. through coordination bonds. It is such coordination interaction that makes uranium highly mobile in aqueous environments, finally resulting in an accidental uranium intake [3]. Once exposed to uranium, human beings would receive kidney and/or liver disease owing to * Qinqin Tao [email protected] * Ying Dai [email protected] 1
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
heavy metal toxicity and radioactivity [4]. It is therefore significant to remove uranium from the environment [5]. The reported techniques for uranium removal include adsorption, solvent extraction, membrane filtration, coprecipitation, photocatalysis and electrochemistry etc. [6]. Compared with these methods, the adsorption technology is the technology of low-energy cost [7], high operativity [8], free of hazardous organic solvent [9] and high efficiency [10] for a target of low concentration [11]. Thus, much attention has been paid to use the adsorption method [12], especially developing effective adsorbents [13]. Various adsor
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