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Adsorption-reduction-immobilization-readsorption cyclic enrichment of Cr (VI) in CS/PPy/PEI aerogels
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Jian-yu XING1, 2, *, Yue-hao BAI1, Huan MA4, Ya-li LIU4, Rui JIA1, 3
China Environmental Science | 2025, 45(9) : 4904 - 4913
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China Environmental Science | 2025, 45(9): 4904-4913
• Water Pollution Control •
Adsorption-reduction-immobilization-readsorption cyclic enrichment of Cr (VI) in CS/PPy/PEI aerogels
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Jian-yu XING1, 2, *, Yue-hao BAI1, Huan MA4, Ya-li LIU4, Rui JIA1, 3
Affiliations
  • 1.School of Water and Environment, Chang'an University, Xi'an 710064, China
  • 2.Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of the Ministry of Education, Chang'an University, Xi'an 710064, China
  • 3.Key Laboratory of Eco-hydrology and Water Security in Arid and Semi-arid Regions of Ministry of Water Resources, Chang'an University, Xi'an 710064, China
  • 4.PowerChina Northwest Engineering Corporation Limited, Xi'an 710065, China
Published: 2025-09-20
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Cr (VI) typically exists as a negatively charged anion, whereas Cr (III) is positively charged as a cation. The positively charged Cr (III) obtained through the reduction of Cr (VI) can further adsorb Cr (VI), thereby enabling cyclic adsorption and enrichment of chromium species. In this study, polypyrrole (PPy) was dispersed in chitosan/polyethyleneimine (CS/PEI) hydrogel network to prepare a composite aerogel named CS/PPy/PEI. The composition and structure of CS/PPy/PEI were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), Zeta potential and UV-vis-NIR spectroscopy. Based on the valence transformation of Cr (VI)/Cr (III), the cyclic enrichment process of Cr (VI) adsorption-photoreduction-immobilization-re-adsorption is established in CS/PPy/PEI aerogel. The results showed that the introduction of ascorbic acid as a co-catalyst during the photocatalytic reduction process could further enhance the enrichment of chromium by CS/PPy/PEI, and the adsorption capacity of CS/PPy/PEI could reach 279.69mg/g after 6cycles of enrichment. Since CS/PPy/PEI aerogels do not contain any other metals, high-purity chromium can be effectively recovered through simple calcination.

polypyrrole  /  adsorption enrichment  /  Cr (VI)  /  photo-reduction  /  valence transition
邢建宇, 白玥皓, 马欢, 刘娅莉, 贾睿. CS/PPy/PEI气凝胶中Cr（VI）的吸附-还原-固化-再吸附循环富集研究. 中国环境科学, 2025 , 45 (9) : 4904 -4913 .
Jian-yu XING, Yue-hao BAI, Huan MA, Ya-li LIU, Rui JIA. Adsorption-reduction-immobilization-readsorption cyclic enrichment of Cr (VI) in CS/PPy/PEI aerogels[J]. China Environmental Science, 2025 , 45 (9) : 4904 -4913 .
Appendix
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Year 2025 volume 45 Issue 9
58
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Article Info
  • Receive Date：2025-02-23
  • Online Date：2026-10-08
  • Published：2025-09-20
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  • Received：2025-02-23
Funding
Affiliations
    1.School of Water and Environment, Chang'an University, Xi'an 710064, China
    2.Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of the Ministry of Education, Chang'an University, Xi'an 710064, China
    3.Key Laboratory of Eco-hydrology and Water Security in Arid and Semi-arid Regions of Ministry of Water Resources, Chang'an University, Xi'an 710064, China
    4.PowerChina Northwest Engineering Corporation Limited, Xi'an 710065, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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