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Start Over Author "Ni, Bing" Journal science of the total environment
36 results on '"Ni, Bing"'

23. Enhanced dark fermentative hydrogen production from waste activated sludge by combining potassium ferrate with alkaline pretreatment

Author

Yang, Jingnan, primary, Liu, Xinyu, additional, Liu, Xuran, additional, Xu, Qiuxiang, additional, Wang, Wenjun, additional, Wang, Dongbo, additional, Yang, Guojing, additional, Fu, Qizi, additional, Kang, Zhenyu, additional, Yang, Qi, additional, Liu, Yiwen, additional, Wang, Qilin, additional, and Ni, Bing-Jie, additional

Published
2020
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36. Polyethylenimine modified potassium tungsten oxide adsorbent for highly efficient Ag + removal and valuable Ag 0 recovery.

Author

Huang QS, Wu W, Wei W, and Ni BJ

Abstract

Elemental Ag 0 is well known for its remarkable catalytic and antibacterial properties, thus the regeneration of valuable Ag 0 metal from Ag + wastewater is of great significance. In this study, a novel polyethylenimine (PEI) modified potassium tungsten oxide (N-K 2 W 4 O 13 ) adsorbent was prepared for Ag + removal and reduction to Ag 0 using glutaraldehyde as crosslinking agent. XPS and FT-IR spectra verified PEI successfully anchored on the surface O and W atoms of K 2 W 4 O 13 through aldehyde bridges. The content of PEI in N-K 2 W 4 O 13 was calculated as 8.74wt% by TG curve. A heterogeneous PEI coating was observed in the SEM and TEM images. The N-K 2 W 4 O 13 exhibited larger Ag + uptake (48.25mg/g) than the raw K 2 W 4 O 13 (42.50mg/g) though required a longer equilibrium time. This was due to the combined results of strong chelation and weak electrostatic repulsion that meanwhile occurring on the positive-charged surface of N-K 2 W 4 O 13 . The maximum Ag + uptake on N-K 2 W 4 O 13 was 72.5mg/g, which was larger than many of the reported adsorbents. Furthermore, the prepared N-K 2 W 4 O 13 displayed good anti-interference toward background ions (Na + , K + ) and hold a stable Ag + removal (>95%) after five runs of recycling tests. The mechanism studies elucidated that NH/N groups from the PEI modified N-K 2 W 4 O 13 mainly accounted for the Ag + adsorption and Ag 0 recovery in the adsorption-reduction process. Ion-exchange between Ag + and K + from the N-K 2 W 4 O 13 lattice also occurred. This work provided a facile method to synthesize a promising adsorbent for Ag + wastewater remediation and valuable Ag 0 recovery., (Copyright © 2019. Published by Elsevier B.V.)

Published
2019
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