ENERGY & FUELS
·
2020
·
IF 3.421
Jia Fang,Zihan Qin,Zhongwei Meng,Yuan Jiang,Jing Liu,Qian Zhang,Jie Tan
This paper studies the impact of ash component, ash particle diameter, soot particles (Printex U, PU)/ash stratification method, and PU/ash mixing ratio on the oxidation process by the thermogravimetric method. Compared with PU/Al2O3 and PU/MgO mixtures, the PU/ZnO mixture has the lowest peak temperature 560 °C and the highest comprehensive oxidation index 2.15 × 10–7%2 min–2 °C–3. ZnO particles (50 nm) lead to lower peak temperature and larger comprehensive oxidation index compared with 200 nm ZnO particles. The tight contact stratification method is better than other ash up and ash down stratification methods because of the heat transferring and the diffusion of oxygen within the particle stratification methods. The 1:15 wt ratio is the best ratio between PU/ZnO particles. The maximum comprehensive oxidation index is 2.21 × 10–7%2 min–2 °C–3, and the minimum peak temperature is 545 °C. Compared with the pure PU, the comprehensive oxidation index and minimum peak temperature improve 126 and 12%, respectively. This study is beneficial for modeling diesel particulate filter regeneration and designing efficient regeneration techniques.
研究领域:
环境科学
·
能源工程
✓ 已验证
DOI
高影响因子
Greenhouse Gases-Science and Technology
·
2019
·Vol. 9
·期 3
·553-566
·
IF 1.693
Menglong Liu,Siyang Tang,Kui Ma,Changjun Liu,Hairong Yue,Bin Liang
Monoethanolamine (MEA) solution has been used widely in the post-combustion CO 2 capture process; however, the high heat duty and reaction temperature (e.g. 125°C) for MEA regeneration leads to a high energy requirement (nearly 70–80% of the total running cost). We report the use of solid particles (H-Zeolite Socony Mobile-5 (HZSM-5), quartz, and activated carbon) to facilitate the mass transfer of CO 2 bubble nucleation and enhance the CO 2 desorption rate. The results show that the mass transfer of CO 2 from liquid phase to gas phase is the rate-determining step, rather than the chemical reaction. The addition of HZSM-5 particles in the solution significantly enhanced CO 2 bubble nucleation by providing nucleation sites and gas cavities, leading to an average CO 2 desorption rate enhancement of 43.2%, and an energy consumption reduction of 23.3%. This process also operated at ∼95°C, which is a much lower temperature than that used in the commercial process and is feasible for industrial applications. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2019
·
IF 3.465
Wenbo Lou,Yang Zhang,Shili Zheng,Ping Li,Ying Zhang,Yi Zhang,Bo Zhao,Zhefei Li,Wei Jin
China generates a large number of scrapped selective catalytic reduction (SCR) catalysts in the fossil fuel combustion plants every year. As a result, there is a giant quantity of 5 × 10 5 t scrapped V 2 O 5 -WO 3 /TiO 2 SCR catalyst annually worldwide, in which arsenic poisoning is a major cause of catalysts deactivation . In this study, a novel cleaner recovery process of alkaline-acid stepwise leaching was proposed for the high‑arsenic scrapped SCR catalysts to achieve excellent arsenic removal and structural reforming. It is found that arsenic can be completely removed from 1.92% to below the detection limit, and the surface area of regenerated catalysts is restored to 31 m 2 /g (similar to that of commercial catalysts). In the subsequent pickling and regeneration, Na + can be eliminated to obtain anatase-type TiO 2 for further activity recovery. Besides, valuable elements (W, V) have been successfully recycled by leaching the As-containing solid waste with ammonium salt. After replenishing active components, regenerated catalyst exhibits comparable activity with the commercial fresh catalyst, offering a promising method for scrapped catalyst recovery and further understanding of cleaner produces for waste management .
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2022
·Vol. 10
·期 2
·2204079
·
IF 17.521
Xu Chen,Ziqi Tian,Qihao Yang,Linjuan Zhang,Qiu Yang,Liang Chen,Zhiyi Lu
The reuse of powdered activated carbon (PAC) vitally determines the economics and security of the PAC-based adsorption process, while state-of-the-art PAC regeneration technologies are usually unsatisfactory. Here, it is demonstrated that isolated Fe sites anchored on commercial PAC enable fast H 2 O 2 activation to produce Fe-based reactive oxygen species for highly efficient PAC regeneration at room temperature. Taking rhodamine B as a representative pollutant, PAC decorated with isolated Fe sites realize H 2 O 2 based regeneration with negligible adsorption capacity degradation for 10 cycles. Moreover, in terms of the PAC loss rate, this technology is greatly superior to traditional Fenton-based regeneration technology. Further operando experiments and theoretical calculations reveal that the high regeneration performance can be attributed to the isolated HO FeO motifs, which activate H 2 O 2 via a nonradical reaction pathway. These findings provide a very promising strategy toward reducing the cost of H 2 O 2 -based PAC regeneration technology.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Dongyu Hou,Jian Chen,Fengning Bai,Fanming Meng,Peng Dong,Chengxu Zhang,Yingjie Zhang,Jue Hu
Recently, the increase in lithium-ion batteries has led to a significant rise in battery scrapping, raising concerns of environmental pollution and resource waste. Therefore, regenerating these discarded lithium-ion batteries has become urgent. In this work, we propose a cost-effective and efficient LiFePO 4 cathode material regeneration technology with nitrogen-doping capabilities. Through plasma discharge, high-energy particles interact with the material's surface, initiating reactions that promote nitrogen-doping. Additionally, the reduction of Fe 3+ impurities to Fe 2+ enhances Li + embedding, thereby inhibiting Fe/Li inversion and achieving structural repair in the process. The regenerated LiFePO 4 , used as the cathode material, exhibits high capacity and cycle performance. It achieves a discharge capacity of 160.2 mA h g −1 at 0.1C and maintains about 146 mA h g −1 at 1C over 200 cycles without significant degradation. Furthermore, the regeneration time is nearly five times shorter than traditional methods. This method's low cost and short processing time provide crucial support for the recycling of waste cathode materials.
研究领域:
材料科学
·
环境科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Meng Xiao,Xiaopeng Fu,Meihua Chen,Meng Ye,Chaoqiong Zhu,Fang Wan,Xiaodong Guo
With the massive application of lithium-ion batteries in electric vehicles, spent lithium iron phosphate (LFP) batteries have accumulated in recent years, inducing an urgent requirement in recycling technology. Direct repair technology has been considered as a promising approach for recycling spent LFP. However, the traditional solid-phase repair technology is limited by the heterogeneous contact between the lithium source and spent LFP. Herein, polyacrylonitrile (PAN) was selected as the additive to facilitate the intimate contact between the lithium source and spent LFP. PAN displays a strong interaction with defective LFP, leading to the effective contact between spent LFP and the lithium replenishment agent. Moreover, PAN is favorable for the diffusion of lithium ions in the spent LFP lattice during the regeneration process. Therefore, the unevenly distributed FeLi defects in spent LFP are well-repaired. As a result, the regenerated LFP exhibits a high capacity of 155 mA h g–1 at 0.1 C and improved cycling stability with a capacity retention of ∼87% after 400 cycles at 1 C.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Yanju Gou,Cai Qi,Ruiqi Li,Xin Liu,Zihao Zhou,Mingdao Zhang,Quan Sun,Li Song,Yachao Jin
Lithium iron phosphate (LiFePO 4 ) batteries are currently becoming the primary power system for electric vehicles. However, after the life period, the heavy amounts of electric cars would give rise to a great number of scrapped LiFePO 4 batteries, which inevitably causes serious environmental pollution and resources waste problems. Therefore, it is much imperative and urgent to develop the green technology for regenerating and recycling these scrapped LiFePO 4 batteries. Herein, we reported an efficient and straightforward solid-phase strategy to achieve the direct regeneration of scrapped LiFePO 4 cathode materials. The decommissioned LiFePO 4 was successfully regenerated by adding lithium carbonate and melamine under the heat treatment condition, and the battery performance was repaired. The electrochemical performance of regenerated LiFePO 4 is even higher than that of the unused LiFePO 4 at 0.05 C. Moreover, the regenerated LiFePO 4 also exhibits excellent capacity preservation rate of 99.03 % after 200 cycles and outstanding rate capability at 5 C with a discharge capacity of 116 mAh/g. The systematical study demonstrates that the nitrogen-doped carbon coatings play vital role in improving the properties of regenerated LiFePO 4 cathode materials. This work provides a potential approach to resolve the scrapped LiFePO 4 cathode materials to meet the coming retired tide of lithium ion batteries.
研究领域:
材料科学
·
环境科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2013
·
IF 2.386
Zhen Wang,Mengxiang Fang,Yili Pan,Shuiping Yan,Zhongyang Luo
A novel membrane vacuum regeneration (MVR) technology was developed to achieve lower regeneration energy demand for CO 2 absorption process. Sixteen different amine-based absorbents including primary, secondary, tertiary amines, polyamines, diamines, and sterically hindered amines were analyzed by combined absorption–desorption screening experiments for selecting the most effective absorbents for CO 2 membrane vacuum regeneration (MVR) technology. The CO 2 absorption experiments were conducted in a hollow fiber membrane contactor (HFMC) at 25 °C and 12.5 kPa CO 2 partial pressure. The CO 2 rich solvent was regenerated at 75 °C and 20 kPa regeneration pressure by using the MVR technology. The chain length, number of functional groups, side chain, and number of hydroxyl groups of amines were investigated to get a better understanding on the effects of the structure in the MVR process. The results show that the tertiary amines have greater regeneration performances than the primary amines, but the CO 2 absorption rates of the tertiary amines are worse than the primary amines. For the polyamines, the absorption performance of polyamines can be improved by increasing the number of amine groups while the MVR performance of the polyamines can be reduced. Steric hindered amines exhibited greater MVR performances. In addition, amines with steric hindrance effect caused by the substitution of hydroxyl group or methyl group to amine group in structure has also shown good performance in the MVR process for CO 2 desorption. The overall performance of amine-based absorbents was also investigated by an absorption–desorption characters analysis. It shows triethylenetetramine (TETA) and N -methyldiethanolamine (MDEA) have great average CO 2 absorption rates and relatively high cyclic capacities per mole absorbent, and ethylenediamine (EDA) is considered to be the promising absorbent as cyclic capacity in mol CO 2 /kg absorbent. Diethanolamine (DEA) and 2-Amino-2-methyl-1-propanol (AMP) are found to have the best overall performances in terms of CO 2 absorption rate at lean loading and cyclic capacity in mol CO 2 /mol absorbent. In terms of overall performance, MDEA is mostly recommended for using in MVR process. Sweeping steam can significantly improve MVR performance in most selected absorbents except AMP and 2-amino-2-hydroxymethyl-1,3- propanediol (THAM) absorbents which present the potential to reduce the regeneration energy demand by operating without sweeping steam. The study also finds that MVR shows better regeneration performance as compared to traditional thermal regeneration process at the same regeneration temperature.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Cheng Cheng,Xuan Cao,Zhanqi Xing,Shaochun Tang
Recycling of spent lithium iron phosphate (LiFePO 4 , LFP) cathode materials is an encouraging way of resource reuse to alleviate environmental issues. Nevertheless, traditional regeneration techniques are usually too complicated and difficult to industrialize, especially no longer applicable to severely degraded LFP cathodes. Herein, we report a novel physically confined-domain pressure sintering method for large-scale direct regeneration of severely degraded spent LFP cathodes (less than 20% residual capacity). By constructing physically confined domains, the interface interaction between lithium ions (Li + ) and the cathode is enhanced and the potential barrier during relithiation is thus decreased, facilitating the insertion of Li + into vacancies. The internal residual conductive carbon builds a reduced circumstance to promote the conversion of the Fe (III) to Fe (II) phase and reduce the Li-Fe anti-site (Fe Li ) defects. The broken small particles (heterogeneous phase) are in-situ re-synthesized into complete olivine structures driven by external pressures. The capacity retention of the regenerated LFP cathodes was 88.8% after 1500 cycles at 5 C. This work provides one-step, highly efficient, and scalable technology for direct regeneration of severely degraded LFP into high-performance cathode materials.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2015
·
IF 0
Kun Wang,Feng Wang,Yu Hai Guo,Hong Yan Tang,Hua Peng Zhang
The polytetrafluoroethylene (PTFE) hollow fiber membranes were prepared through a cold pressing method including paste extruding, stretching and sintering in this study. Membrane vacuum regeneration technology (MVR) was developed as a novel regeneration technology for regeneration of the absorbent. The membrane structures of the PTFE hollow fiber membranes were investigated. The mixture of N-methyldiethanolamine and piperazine was selected as the absorbent. The PTFE hollow fiber membranes were used for regeneration through vacuum membrane regeneration technology. The CO2 regeneration flux and regeneration ratio increased with the increase of the regeneration temperature and the CO2 loading. The regeneration pressure was negative to the regeneration flux and regeneration ratio. When the flow rate of the rich solution increased, the regeneration ratio decreased and CO2 regeneration flux increased significantly.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2019
·Vol. 92
·期 1
·134-145
·
IF 1.986
Xia Lijian,Yao Binbin,Shi Hao,Shi Zhekun,Wang Wenpin,Kan Ze
In this paper, we report the fundamental method for controlling monodispersed silica nanoparticles size ranged from 10 to ~135 nm assisted by lysine or lysine hydrochloride, during which the seed regrowth technique was utilized. The synthesis was prepared in the water-base system, which was environment friendly and convenient. According to our research, the influence factors of co-solvent system, molar content of additional TEOS, and molar ratio composition of additional TEOS/seeds were confirmed. The final morphology and size of silica nanoparticles can be tuned by changing the amount of additional TEOS and the seeds size. To guarantee the monodispersity of final particles. In the regrowth process, cyclohexane used as the co-solvent floated on the surface of water to block additional TEOS contact with water directly, and made the silicate intermedium consumable for the growth of the parent particles immediately, while not forming new nucleation. In such a condition, to lower the cost and prepare mass production, the lysine was replaced by lysine hydrochloride, meanwhile, triethylamine was introduced to neutralize the hydrochloride. It should be noted that as the particle size increased to be more than 100 nm, when usinglysine hydrochloride and triethylamine, the types of nitrogen adsorption–desorption isotherms changed from H1 to H3; in contrast, the isotherms of the particles were changed from H2 to H1 when catalyzed by lysine.
研究领域:
材料科学
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Tao Wu,Lin Huang,Jing Sun,Jiahui Sun,Qi Yan,Bo Duan,Lina Zhang,Bin Shi
The guided tissue regeneration technique is an effective approach to repair periodontal defect. However, collagen barrier membranes used clinically lose stability easily, leading to soft tissue invasion, surgical site infection, and failure of osteogenesis. An ideal barrier membrane should possess proper antibacterial, osteoconductive activities, and favorable biodegradation. In this study, zinc oxide nanoparticles were homogeneously incorporated into the chitin hydrogel (ChT-1%ZnO) through one-step dissolution and regeneration method from alkaline/urea solution the first time. The remaining weights of ChT-1%ZnO in 150 μg/mL lysozyme solution was 52% after 5 weeks soaking. ChT-1%ZnO showed statistical antibacterial activities for P. gingivalis and S. aureus at 6 h, 12 h, and 24 h. Moreover, ChT-1%ZnO exhibits osteogenesis promotion in vitro , and it was further evaluated with rat periodontal defect model in vivo . The cemento-enamel junction value in ChT-1%ZnO group is 1.608 mm, presenting a statistical difference compared with no-membrane (1.825 mm) and ChT group (1.685 mm) after 8 weeks postoperatively.
研究领域:
牙科
·
生物材料
·
纳米技术
·
组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）