Abstract
In this study a novel manganese dioxide modified nanofiber was facile prepared using the electrospinning technique. The as-prepared manganese dioxide/poly(vinyl alcohol)/poly (acrylic acid) (briefly as MnO2-PVA/PAA) was firstly characterized by SEM, FT-IR, XRD, stress-strain test and secondly tested as an adsorbent to remove uranium from aqueous solution. Effect of pH, ionic strength, initial uranium concentration, mixing time, temperature on the adsorption, reusability and adsorption mechanism were illustrated. The theoretical adsorption amount of MnO2-PVA/PAA calculated as 398.85 mg/g was competitive compared with the reported values. The study proved MnO2-PVA/PAA is promising in the uranium removal from aqueous medium.
Highlights
Global fossil fuels such as coal, petroleum and natural gas are being intensively consumed and expectedly depleted within two hundred years in terms of currently annual consumption [1]
One can see that both nanofibers were non-directional homogeneous fiber beams without beads
The FT-IR spectrum shown in Figure 1(c) displayed the characteristic bands of PVA/PAA at 3340 cm−1, 2942 cm−1, 1710 cm−1, 1090 cm−1 and 850 cm−1 were resulted from vibrations of hydroxyl, C-H asymmetric, C=O in carboxyl and ester groups, C-O-C from the crosslinking reaction of PVA and PAA stretching and C-H bending
Summary
Global fossil fuels such as coal, petroleum and natural gas are being intensively consumed and expectedly depleted within two hundred years in terms of currently annual consumption [1]. The challenges in utilization of manganese dioxide as an adsorbent are as following: 1) Uranium uptakes of the raw manganese dioxide were demonstrated as commonly less than 60 mg/g [14]; 2) The fine particle size and aggregation of manganese dioxide lead to the difficulty in solid-liquid separation as well as the low efficiency in removal of uranium. It is such reason that many modification of manganese dioxide were conducted. The results demonstrated the high potential of MnO2-PVA/PAA as a candidate in membrane separation for uranium
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