WATER SCIENCE AND TECHNOLOGY
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2021
·Vol. 84
·期 8
·1930-1942
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IF 1.915
Huang Jialei,Luo Yan
Persulfate oxidation technology is widely used in wastewater treatment, but there are still many disadvantages, such as high energy consumption, side reaction and narrow pH applicability. Copper oxides can activate persulfate steadily with higher efficiency. In this paper, a novel preparation method of shape-controlled cuprous oxide (Cu 2 O) nanoparticles featured with high catalytic performance was explored. It was found that adding ionic liquid 1-butyl-3-methylimidazolium bromide ([BMIM]Br) during preparation of Cu 2 O can improve the degradation rate of diclofenac (DCF). Cu 2 O nanoparticles possess good stability in consecutive cycling tests, which was confirmed by X-ray photoelectron spectroscopy. The possible mechanism of Cu 2 O activating persulfate at different initial pH conditions was discussed based on electron paramagnetic resonance spin-trapping experiment. It was found that DCF was efficiently degraded in the Cu 2 O/peroxydisulfate (PDS) system within a broad pH range from 5 to 11. It proved via a quenching experiment that the activation process of PDS mainly occurs on the surface layer of Cu 2 O nanoparticles. As a result, shape-controlled Cu 2 O nanoparticles prepared by ionic liquid are expected to be used for in situ chemical oxidation, which is an effective oxidation processes to degrade DCF remaining in surface water and ground water. This study provides a novel preparation method of shape-controlled cuprous oxide (Cu 2 O) particles featured with high catalytic performance to degrade diclofenac (DCF). It overcomes the disadvantages of degradation of organic pollutants by the traditional Fe in situ chemical oxidation system to some extent, such as being unrecyclable and having a narrow application range of pH value.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2022
·
IF 9.224
Xuelian Zhou,Wenli An,Xuehuan Xia,Yuwei Long,Xuehui Liu,Shimei Xu,Yu-Zhong Wang
The high mechanical strength and thermal resistance of an epoxy (EP) thermoset make it ideal for wide applications in industries such as energy, aerospace, electronics, and construction but increase the difficulty in controllable and efficient recovery. Herein, acidic ion exchange resin-induced oxidative degradation of the EP thermoset was developed to obtain homogeneous oligomers at 85 °C in 4 h. The C–N bond is activated by free H+ of the ion exchange resin while the oxidation depth was dependent of acid groups of the ion exchange resin. There was no significant difference in the molecular weight or polydispersity index after complete degradation even when varying the degradation temperature and time. Even more, homogeneous degraded EP microspheres can be easily obtained by a water-induced phase separation method and it was a good candidate for wastewater treatment in the field of dye removal with a CV adsorption capacity of 270 mg/g and oil–water separation with a water flux of 57,325 L m–2 h–1 and a separation efficiency of 99.9%. This work overcomes the shortcomings of non-controllable degradation and the resultant complex products in traditional oxidative degradation systems of the EP thermoset. In addition, it provides a new insight into controllable recovery and value-added reutilization by taking advantages of both the waste EP and waste acidic ion exchange resins.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Zikun Mai,Yuhao Ge,Yuan Feng,Kai Luo,Hao Zhang,Meng Huang,Jiashen Meng,Xuanpeng Wang
Spent lithium-ion battery graphite anodes (SG) feature in situ low-crystalline surface defects that hinder Li-ion diffusion and undermine structural stability. Conventional high-temperature remediation partially repairs defects but faces practical limitations due to energy-intensive processing and structural degradation risks. Here, we propose an efficient regeneration strategy based on low-temperature molten salt activation combined with controlled oxidation, aiming to efficiently regenerate SG with a focus on eliminating low-crystalline defects. The molten salt treatment activates the ion storage site, and the liquid-phase environment provides rapid ionic transport kinetics, facilitating impurity removal reactions. The oxidation calcination further removes low-crystalline defects of SG, ultimately harvesting regenerated graphite (RG-150–500) with purity of 99.22%. The RG-150–500 exhibits a high reversible capacity of 356.7 mAh g−1 at 0.2C, and a stable cyclability of 250 cycles with a capacity retention of 360.8 mAh g−1. From 0.1C to 2C, the rate capacity of RG-150–500 decreases from 369.5 to 243.9 mAh g−1, and when the rate returns to 0.1C, the recovery rate is 99.2%, revealing the high-rate capability of RG-150–500. Furthermore, the regeneration cost of RG-150–500 is only $7.442 per kg and the corresponding profit is $2.558 per kg. Therefore, this study provides an eco-friendly and energy-efficient solution for SG regeneration, particularly through its effective elimination of low-crystalline defects.
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产品关联
DOI
高影响因子
PROCESS BIOCHEMISTRY
·
2023
·
IF 4.4
Chenchen Zhao,Yu Sha,Wei Zhuang,Yuan Rao,Jihang Zhang,Jinglan Wu,Tao Shen,Zhuotao Tan,Chenjie Zhu,Hongman Zhang,Hanjie Ying
Hydroxytyrosol (HT) is a novel functional pharmaceutical or food ingredient that can be prepared using tyrosinase (TYR) as the catalyst. In this study, cross-linked agarose resin (AG-NTA-Ni 2+ ) was selected as the carrier for the one-step immobilization and purification of the enzyme via specific adsorption of the His-tag on the protein and metal ions on the carrier particles. The immobilized TYR exhibited excellent thermal and pH stabilities and retained 82.3% of its relative activity after seven cycles. Using different reduction methods, immobilized TYR was used as a catalyst to synthesize HT via the controlled oxidation of tyrosol. The enzymatic cascade reaction of co-immobilized TYR and glucose dehydrogenase (GDH) as a biocatalyst served as a bioreduction method with an HT yield of 88%. For the chemical reduction using ascorbic acid (AA) as the reducing agent, an 80% HT yield was achieved. These results indicate that the immobilization method, which relies on the specific coordination between transition metal ions and certain protein amino acids , is a potential strategy for the effective co-immobilization of TYR and GDH. The proposed affinity co-immobilization technique is among the potential strategies for the efficient production of HT.
研究领域:
生物技术
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酶学
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药学
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食品科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）