Co-Free High-Entropy Alloys Powders Immobilized by Electrospray and Microfluidics for Decolorization of Azo Dye

doi:10.1007/s40195-019-00997-x

金属学报英文版 ›› 2020, Vol. 33 ›› Issue (8): 1103-1110.DOI: 10.1007/s40195-019-00997-x

收稿日期:2019-09-30 修回日期:2019-11-02 出版日期:2020-08-10 发布日期:2020-08-06

Co-Free High-Entropy Alloys Powders Immobilized by Electrospray and Microfluidics for Decolorization of Azo Dye

Shikai Wu¹, Wei Gao², Tao Lu¹, Ye Pan¹()

¹School of Materials Science and Engineering, Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University, Nanjing, 211189, China
²School of Energy and Environment, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing, 211189, China

Received:2019-09-30 Revised:2019-11-02 Online:2020-08-10 Published:2020-08-06
Contact: Ye Pan

摘要/Abstract

Abstract:

In recent years, high-entropy alloys (HEAs) have received more and more attention due to their unique microstructure and properties. Several researchers have reported that some ball-milled (BM) HEAs powders possess prominent decolorization performance for azo dyes. Three kinds of Co-free HEA powders (AlCrFeMn, AlCrFeNi and FeCrNiMn) have been synthesized by ball milling in this work, of which AlCrFeMn shows the best decolorization efficiency for DB6 aqueous solution. However, at this time, the BM HEAs are in powder state and not easy to be reused, so the loss rate of the powders is high during the reaction. Sometimes, the reaction between reacted the powders and the dye solution is too fast to control. While, in order to solve these problems, this work proposes to immobilize bare BM AlCrFeMn HEA powders in calcium alginate beads (CABs) by electrospray and microfluidics. Through four cycles of reaction, the loss rate of the AlCrFeMn powders can be reduced from 40 to 5 wt% if the powders are immobilized by CABs with an average diameter of 0.55 mm obtained at the DC voltage of 30 kV. In addition, in the four cycles of experiment, the AlCrFeMn HEA-CABs with an average diameter of 0.55 mm shows better stability and easier separation than that of the bare AlCrFeMn powders. These findings provide new ideas for HEAs to decolorize azo dyes and are of great significance for protecting freshwater resources.

Key words: High-entropy alloys, Ball-milled, Decolorization performance, Calcium alginate beads, Electrospray and microfluidics

. [J]. 金属学报英文版, 2020, 33(8): 1103-1110.

Shikai Wu, Wei Gao, Tao Lu, Ye Pan. Co-Free High-Entropy Alloys Powders Immobilized by Electrospray and Microfluidics for Decolorization of Azo Dye[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(8): 1103-1110.

图/表 6

Fig. 1 SEM images of the bare BM AlCrFeMn HEA powders a, the bare BM AlCrFeNi HEA powders b, the bare BM FeCrNiMn HEA powders c before decoloration, d X-ray diffraction curves of the bare BM AlCrFeMn, AlCrFeNi and FeCrNiMn HEAs powders before decoloration

Fig. 2 Optical microscope images of the four kinds of AlCrFeMn HEA-CABs at the four different DC voltages: a 0 kV, b 10 kV, c 20 kV, d 30 kV

Fig. 3 SEM images of the AlCrFeMn HEA-CABs obtained at the DC voltage of 30 kV after freeze-drying: a low magnification, b large magnification

Fig. 4 Comparison of the decoloration efficiency of DB6 by 0.5 g/L AlCrFeMn, AlCrFeNi and FeCrNiMn after fitting at 25 °C: a decoloration curves, b fitting time

Fig. 5 Decoloration curves of DB6 by the four kinds of pure CABs a, the four kinds of AlCrFeMn HEA-CABs and the bare BM AlCrFeMn HEA powders b, c comparison of the fitting time for decolorizing DB6 by the four kinds of AlCrFeMn HEA-CABs and the bare AlCrFeMn HEA powders

Fig. 6 a Decoloration curves of DB6 by the pure CABs with an average diameter of 0.55 mm, the AlCrFeMn HEA-CABs with an average diameter of 0.55 mm and the bare AlCrFeMn HEA powders; cyclic decolorization curves of DB6 by the bare AlCrFeMn HEA powders b , the AlCrFeMn HEA-CABs c

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Co-Free High-Entropy Alloys Powders Immobilized by Electrospray and Microfluidics for Decolorization of Azo Dye

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