WASTE MANAGEMENT
·
2018
·
IF 4.723
Junqiang Zhang,Zhishuai Wang,Tong Li,Zhi Wang,Shu Zhang,Mei Zhong,Yue'e Liu,Xuzhong Gong
CaO-containing carbon pellets (CCCP) was prepared by mixing carbide slag (Ca(OH) 2 ) and powdered char to produce CaC 2 , achieving the recycling of carbide slag during CaC 2 production process. The thermal strength of CCCP was the focus of most attention when employing arc furnaces as reactors for CaC 2 production in industry. To improve the thermal strength of CCCP, H 3 PO 4 was used as a binder in this study. The results indicated that Ca 3 (PO 4 ) 2 reacted by H 3 PO 4 and Ca(OH) 2 could help refine the average particle sizes of CaO, resulted in a relatively uniform pore diameter distribution of CCCP with low porosity, therefore improving the thermal strength of CCCP. When H 3 PO 4 content was more than 8 wt%, some over-sintering and melting structure for CaO particles appear, and thus resulting in the decrease in thermal strength of CCCP. The experimental results show that CCCP with 3% H 3 PO 4 has the best thermal strength at 1100 °C. The non-isothermal shrinkage kinetics of CCCP indicated that the addition of 3% H 3 PO 4 reduced the apparent activation energy of sintering reactions and accelerated the sintering of CaO particles in CCCP. Furthermore, the addition of H 3 PO 4 has a positive effect on the formation of CaO sintered necks, enhancing the strength of CCCP.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2020
·Vol. 13
·期 17
·3871
·
IF 3.057
Bingbing Wan,Wenfang Li,Wanting Sun,Fangfang Liu,Bin Chen,Shiyao Xu,Weiping Chen,Aihua Yi
Secondary aluminum dross (SAD) is regarded as a solid waste of aluminum recycling process that creates serious environmental and health concerns. However, SAD can also be used as a good source of aluminum, so that utilizing the SAD for the production of valuable products is a promising approach of recycling such waste. In the present work, a novel eco-friendly three-step process was proposed for the synthesis of cryolite (Na3AlF6) from the SAD, and it consisted of (1) water-washing pretreatment of SAD, (2) extraction of Al component via pyro-hydrometallurgy, including low-temperature alkaline smelting, water leaching and purification of leachate in sequence, (3) precipitation of cryolite from the purified NaAlO2solution using the carbonation method. By analysis of the parameter optimization for each procedure, it was found that the maximum hydrolysis efficiency of aluminum nitride (AlN) in the SAD was around 68.3% accompanied with an extraction efficiency of Al reaching 91.5%. On this basis, the cryolite of high quality was synthesized under the following optimal carbonation conditions: reaction temperature of 75 °C, NaAlO2concentration of 0.11 mol/L, F/(6Al) molar ratio of 1.10, and 99.99% CO2gas pressure, and flow rate of 0.2 MPa and 0.5 L/min respectively. The formation of Na3AlF6phase can be detected by XRD. The morphological feature observed by SEM revealed that the as-synthesized cryolite had a polyhedral shape (~1 μm size) with obvious agglomeration. The chemical composition and ignition loss of the as-synthesized cryolite complied well with the requirements of the Chinese national standard (GB/T 4291-2017).
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Energy Storage Materials
·
2025
·
IF 20.2
Guisheng Zeng,Chongwen Hu,Rui Zhou,Juyong Wang,Xianfu Liu,Jianwen Huang,Jiaping Yu,Guanghui Wu,Zhongbing Wang,Chunjian Deng,Junwei He,Chunli Liu,Xubiao Luo
With the impending increase in the number of retired lithium-ion batteries, effective recycling and upcycling strategies must be explored to alleviate resource shortages, address environmental pollution, and meet the growing demand for high-performance cathode materials. This study proposes a closed-loop upcycling strategy that utilizes current collector aluminum (Al) as both a dopant and raw material for surface coating. This approach repairs the structural defects of highly degraded LiCoO 2 (LCO) cathode materials and achieves bulk Al doping and surface LiAlO 2 coating, transforming them into high-performance cathode materials capable of stable operation at a high voltage of 4.5 V. Specifically, bulk Al doping suppresses irreversible phase transitions and enhances structural stability, while the LiAlO 2 coating improves interfacial charge transfer and mitigates polarization. The synergistic effects of these modifications collectively enhance the electrochemical stability of LCO. The upcycled material delivers an initial discharge capacity exceeding 181.5 mAh g -1 and retains 93.9% of its capacity after 200 cycles at 1 C. Even under a high current rate of 10 C, the discharge capacity remains above 150.1 mAh g -1 , thereby outperforming commercial LCO cathodes. This study provides a simple and efficient solution for the direct upcycling of degraded LCO cathode materials into high-performance alternatives.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Xiongfei Zhang,Yana Shi,Chunxiao Qu,Xiang Shi,Qianya Tan
Various recycling methods of epoxy resins were proposed, but they most involve harsh reaction conditions. Herein, it was reported on a mild and efficient method for the complete degradation of amine cured epoxy resin, and it explored the potential reuse of the degradation products. Formic acid was used as a swelling agent, and a mixture solution of nitric acid and acetic acid served as an oxidizing agent. The amine cured epoxy resin was completely degraded at 100°C within 40 min, and the degradation yielded oligomers with high molecular weight. The degraded oligomers were used as fillers to make new epoxy materials with fresh epoxy resins. The mechanical properties and the thermal stability are similar to those of the original epoxy resins. This work provides a mild but efficient way to dispose of waste epoxy products under mild conditions.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Qinglian Wang,Huaiyu Wang,Jintian Zhong,Zhaoyang Qi,Jie Chen,Changshen Ye,Ting Qiu
Deep desulfurization of fuel oil is always a highly challenging issue. In this work, ZrXPTA material was obtained by directly combining the ZrIV active site with PTA, and it was found that ZrXPTA has excellent catalytic activity in the oxidative desulfurization (ODS) process. Further, ZrXPTA was loaded on γ-Al2O3 by the two-step impregnation to obtain a granular Al2O3@ZrXPTA composite. The successful synthesis of the material was verified by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), and N2 adsorption–desorption. The results show that Al2O3@ZrXPTA maintains the high ODS activity of ZrXPTA and realizes the rapid and complete removal of dibenzothiophene under mild reaction conditions (T = 40 °C, O/S = 4, t = 30 min). The mechanism study shows that the ODS activity of Al2O3@ZrXPTA is wholly derived from the counterpart of ZrXPTA, which benefits from the synergistic catalytic effect between the ZrIV active site and PTA. The direct binding of these two active sites makes the synergistic effect fully exerted. In addition, the recovery of Al2O3@ZrXPTA can be easily realized by simple filtration or decantation, and no significant activity loss was observed after five times recycling. Therefore, Al2O3@ZrXPTA has high ODS activity, high catalytic stability, and great potential as an ODS catalyst in practical applications.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2015
·
IF 2.133
Muhammad Ammar,Sai Jiang,Shengfu Ji
A new strategy has been developed for the encapsulation of the phosphotungstic heteropoly acid (H 3 PW 12 O 40 denoted as PTA) into zeolite imidazolate framework (ZIF-67) cage and the PTA@ZIF-67(ec) catalysts with different PTA content were prepared. The structure of the catalysts was characterized by XRD , BET, SEM, FT-IR, ICP-AES and TG. The catalytic activity and recovery properties of the catalysts for the Friedel-Crafts acylation of anisole with benzoyl chloride were evaluated. The results showed that 14.6–31.7 wt% PTA were encapsulated in the ZIF-67 cage. The PTA@ZIF-67(ec) catalysts had good catalytic activity for Friedel-Crafts acylation. The conversion of anisole can reach ~100% and the selectivity of the production can reach ~94% over 26.5 wt% PTA@ZIF-67(ec) catalyst under the reaction condition of 120 °C and 6 h. After reaction, the catalyst can be easily separated from the reaction mixture by the centrifugation. The recovered catalyst can be reused five times and the selectivity can be kept over 90%.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Guoliang Xu,Mingming Wu,Taotao Ji,Chen Wang,Sixing Chen,Yi Liu
Although having shown great promise in gas separation, reverse osmosis , and nanofiltration , preparation of carbon membranes, which commonly involves elaborate high-temperature pyrolysis or exfoliation-reassembly, still suffers from complicated fabrication procedure and/or high production cost. In this study, we pioneered the preparation of continuous asymmetric carbon membrane through facile mechanical rubbing of a pencil graphite. Among them, 2B-type pencil with 64 wt% graphite exhibited superior nanofiltration performance (Congo Red rejection rate of 99.4% and water flux of 21.91 L·m −2 ·h −1 ·bar −1 ). Long-time operation confirmed its excellent stability. Of particular note, the spent membrane could be facilely recovered by erasing, resulting in not only zero pollutant discharge but also full recovery and reutilization of the substrate. The above protocol is anticipated to pave an avenue for facile and sustainable production of versatile carbon membranes with superior separation performances.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·
IF 9.3
Yunjian Wu,Yiran Hu,Hui Lin,Xiaoxing Zhang
Anhydride-cured epoxy is a common insulating material used in electrical equipment, but recycling it effectively is difficult, which results in the overall abandonment of the equipment after decommissioning and serious environmental pollution. In order to make anhydride cured epoxy degradable while maintaining its electrical performance, we synthesized a high-performance epoxy insulating material that can be recycled and reused using triethanolamine as a transesterification catalyst co-accelerator. Results show that the new epoxy has the lowest dielectric loss of 0.0012, the highest breakdown strength of 42.26 kV mm−1, and the highest tensile strength of 93.7 MPa. The degradable epoxy can be recovered via mechanical hot pressing and regenerated through chemical degradation. Degradation products can be directly used as curing accelerators to complete the re-preparation of the insulating material. Even after recovery, the properties of the epoxy resin meet the application requirements of insulating materials.
研究领域:
材料科学
·
环境科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
WASTE MANAGEMENT
·
2021
·
IF 7.145
Huimeng Yang,Bowen Deng,Xiaoyun Jing,Wei Li,Dihua Wang
Regenerating cathode material from spent lithium-ion batteries (LIBs) permits an effective approach to resolve resource shortage and environmental pollution in the increasing battery industry. Directly renovating the spent cathode materials is a promising way, but it is still challenging to efficiently remove all of the complex impurities (such as binder, carbon black, graphite and current collectors) without destroying the material structure in the electrode. Herein, a facile strategy to directly remove these impurities and simultaneously repair the degraded LiCoO 2 by a target healing method is reported. Specifically, by using an optimized molten salt system of LiOH-KOH (molar ratio of 3:7) where LiNO 3 and O 2 both serve as oxidants, the impurities can be completely removed, while the structure, composition and morphology of degraded LiCoO 2 can be successfully repaired to commercial level based on a two-stage heating process (300 °C for 8 h and 500 °C for 16 h, respectively), resulting in a high recovery rate of approximately 100% for cathode material. More importantly, the regenerated LiCoO 2 exhibits a high reversible capacity, good cycling stability and excellent rate capability, which are comparable with commercial LiCoO 2 . This work demonstrates an efficient approach to recycle and reuse advanced energy materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2012
·
IF 2.721
Wenjun Fang,Dongbei Shao,Xiaoxing Lu,Yongsheng Guo,Li Xu
A total of 10 new N-alkyl piperazinium-based ionic liquids (ILs) have been prepared, and they are used as extractants for removing aromatics from three kinds of hydrocarbon fuels. A total of 3 ILs, N-methyl piperazinium lactate (MPL), N-ethyl piperazinium lactate (EPL), and N-ethyl piperazinium propionate (EPP), in the liquid state at room temperature are used directly for extraction, while the other 7 ILs in the solid state at room temperature are used with methanol as the co-solvent. Effects on the extraction efficiency of the temperature and the amounts of IL and co-solvent are investigated. The results indicate that the amounts of IL and co-solvent play very important roles in the extraction process and the efficiency is greatly influenced by the cation and anion structures in the N-alkyl piperazinium-based ILs. In comparison to 1,1,3,3-tetramethylguanidinium lactate (TMGL), the extraction capability order is EPP > EPL > MPL > TMGL. The ILs with aromatic anions are found to have better extraction capability than the others. Furthermore, recycling of ILs reflects that these ILs can be recovered simply by vacuum distillation without a significant decrease in the activity of dearomatization.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Xiao-Li Zhou,Pin-Jing He,Wei Peng,Shou-Xin Yi,Fan Lü,Li-Ming Shao,Hua Zhang
Polyvinyl chloride (PVC) is one of the most commonly used plastics. The treatment and recycling of PVC waste is still challenging, due to its non-biodegradability, low thermal stability, high Cl content and low product value. In this study, a one-pot method was developed to upcycle PVC into valuable carbon materials, pipeline-quality pyrolysis gas and chlorides. The well-designed process included dechlorination by Cl-fixative (ZnO or KOH), carbonization of dechlorinated polyenes, and modification of carbon materials in sequence. ZnO and KOH converted 84.48% and 94.15% of total Cl into corresponding chlorides, respectively. CH 4 and H 2 accounted for 81.87–99.34 vol% of pyrolysis gas with higher heat values of 30.11–32.84 MJ m −3 , which can be used as substitute natural gas. As high as 83.13% of the C element was converted into carbon materials. The morphology, structure and property of carbon materials can be modified by different Cl-fixatives. Millimeter-scale carbon spheres with mono-dispersity and porous carbon with a high specific surface area of 1922 m 2 g −1 were obtained when ZnO and KOH were added, respectively. Moreover, the reaction mechanisms of PVC with Cl-fixatives were also deciphered through thermogravimetric analysis and thermodynamic simulation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 16
·8749-8768
·
IF 6.123
Zhang Zhiyong,Liu Tang,Wu Deyi
The removal and recovery of phosphate from water using adsorption technology require that the adsorbent material is easily separable from treated water. Continuous efforts are still awaited to develop additional efficient phosphate adsorbents that are economical to fabricate. In this study, hydrous zirconia-impregnated chitosan beads (HZCB) containing different Zr/chitosan ratios were synthesized using a facile scheme. We found that HZCB with a Zr/amine molar ratio of ~ 1 (HZCB-1) possessed excellent stability and phosphate removal performance. This optimized material was characterized with XRD, SEM, FTIR, XPS, specific surface area and point of zero charge measurements. The maximum adsorption capacity was 42.02 mg/g (at pH ~ 6.7). The adsorption kinetics were best described by a pseudosecond-order model, and the rate constant of HZCB-1 was much lower than that of its powder but was similar to the commercial bead product Ferrolox. The removal of phosphate depended substantially upon pH and was enhanced by lowering the pH. Good selectivity of HZCB-1 for phosphate was observed, although the coexistence of sulfate produced a significant negative effect. Direct coordination of phosphate to Zr atoms by replacing hydroxyls was the dominant adsorption mechanism (~ 85%), while chitosan also contributed to phosphate removal (~ 15%). Adsorbed phosphate was successfully eluted by an NaOH solution, and the material obtained after desorption and regeneration was able to be repeatedly used. The results of column studies indicated that this material could be implemented in long-term application.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）