Nanomaterials
·
2020
·Vol. 10
·期 6
·1097
·
IF 4.324
Xueying Mu,Yunhui Li,Xiaoguang Liu,Changde Ma,Hanqing Jiang,Jiayi Zhu,Xuecheng Chen,Tao Tang,Ewa Mijowska
Polyethylene terephthalate (PET) plastic has been extensively used in our social life, but its poor biodegradability has led to serious environmental pollution and aroused worldwide concern. Up to now, various strategies have been proposed to address the issue, yet such strategies remain seriously impeded by many obstacles. Herein, waste PET plastic was selectively carbonized into three-dimensional (3D) porous carbon nanosheets (PCS) with high yield of 36.4 wt%, to be further hybridized with MnO2nanoflakes to form PCS-MnO2composites. Due to the introduction of an appropriate amount of MnO2nanoflakes, the resulting PCS-MnO2composite exhibited a specific capacitance of 210.5 F g−1as well as a high areal capacitance of 0.33 F m−2. Furthermore, the PCS-MnO2composite also showed excellent cycle stability (90.1% capacitance retention over 5000 cycles under a current density of 10 A g−1). The present study paved an avenue for the highly efficient recycling of PET waste into high value-added products (PCSs) for electrochemical energy storage.Keywords:PET;waste plastic;carbonization;energy storage
研究领域:
材料科学
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环境科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2024
·
IF 5.8
Yanlong Jia,Mengyan Wang,Bolun Li,Jiang Liu,Xueping Song,Min Wu,Yongjun Yin
To solve the long-term environmental pollution caused by black liquor and waste plastics, and achieve high-value utilization, the method about co-pyrolysis of black liquid solid and waste plastics (Polypropylene, Polyethylene) catalyzed by Mo-Ni/HZSM-5 to prepare high-quality bio-oil is studied. The results found that hydrocarbons increased from 14.92% to 42.03% as Polyethylene was co-pyrolyzed with BLS, and hydrocarbons increased from 14.92% to 41.75% as Polypropylene was co-pyrolyzed with BLS, adding plastics can significantly improve the hydrocarbons yield of black liquor. Mo-Ni/HZSM-5 acts as a hydro deoxidizer in the pyrolysis of black liquid and waste plastics, the total hydrocarbons of black liquid solid, black liquid solid& Polypropylene, black liquid solid & Polyethylene increased by 6%, 78%, and 45%, respectively. An appropriate increase of pyrolysis temperature can promote the co-pyrolysis of BLS with PP, and BLS with PE, and can increase the yield of hydrocarbons. Compared with black liquor’s pyrolysis, the yield of hydrocarbons can be increased by 59.65% and 24.52% as Polyethylene or Polypropylene is adapted to pyrolysis with black liquid solid, respectively, the high-quality bio-oil is obtained because of a large number of hydrocarbons and high hydrogen content.
研究领域:
环境科学
·
能源工程
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Fuwei Li,Xiaofeng Wang,Hengshuo Gu,Hongbing Fu,Asad Ali,Hongfei Lin,Zhixia Li
Minimizing the catalyst cost is critical to achieving long-term economic feasibility for obtaining bio-chemicals directly from biomass. In the present study, low cost ZSM-5 was synthesized via hydrothermal crystallization of the activated aluminosilicate gel without adding any organic ammonium templates and additional seed crystals . The activation process promoted the depolymerization of the silica-alumina species and the formation of active pasty gel containing nucleation precursors, consequently accelerating the subsequent crystallization reaction. The addition of eucalyptus sawdust (ES) in the synthesis process increased the BET (Brunauer-Emmett-Teller) surface area and acidity of the resultant zeolites . The ES-mediated ZSM-5 (AGZ-10) achieved a higher benzene, toluene, ethylbenzene and xylene (BTEX) carbon yield (18.9 %) from co-cracking of ES and waste plastics (WP) (ES/WP mass ratio at 1:1) at 500 °C and exhibited better synergistic effect and anti-coking ability compared to the commercial ZSM-5. The results provide an efficient synthetic strategy to produce low-cost zeolites, and a promising technique to effectively utilize biomass and plastic wastes.
研究领域:
能源与环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Leping Cheng,Yuwei Liu,Die Li,Wenjie Xu,Jingbo Jia,Runduo Zhang,Ying Wei,Maria A. Goula,Vagelis G. Papadakis
Thermochemically upcycling waste plastics to value-added products is emerging to alleviate the waste crisis. This study aims to develop highly active and stable Ni-based catalysts for coupling pyrolysis and catalytic reforming of waste plastics to produce syngas. A series of confined NiO@S-1 catalysts with various Ni loadings (5%, 10%, 15%, and 20%) were constructed by employing dissolution-recrystallization strategy. They were in situ reduced and 15%NiO@S-1 sample showed the highest catalytic activity in terms of yield of syngas with high CO selectivity and was superior to 15%NiO/S-1 and 15%NiO/SiO 2 samples prepared by impregnation method. The TEM images of 15%NiO@S-1 catalyst after reaction showed that metallic Ni nanoparticles with average size of 10.1 nm were kept dispersive due to the confinement effect. In contrast, the apparent agglomeration of Ni nanoparticles with average size of 54.9 nm were found on the surface of 15%NiO/S-1 after reaction. This provides an effective strategy for design robust Ni-based confined catalysts for thermochemically upcycling waste plastics.
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 Cleaner Production
·
2024
·
IF 9.7
Han Sun,Zhiyi Wang,Jiming Su,Yingshuang Zhang,Chongqing Wang,Hui Wang,Hongru Jiang
Plastics offer considerable convenience in daily life and human health. However, a substantial amount of waste plastics is released into the environment without proper treatment, posing significant environmental challenges. Recycling and separating waste plastics is difficult due to their similar chemical and physical properties. This study introduces a novel method combining polymeric ferric sulfate (PFS) modification with flotation for efficient plastic separation. In order to achieve the optimal flotation conditions, single parameter experiments were used to confirm the key variables that have a close correlation with the flotation performance, namely PFS dose, temperature, time and pH value. PFS has different hydrophilic effects on polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS) and polyvinyl chloride (PVC) surfaces, whereas polyethylene terephthalate (PET) remains unaffected. For purpose of achieving the individual separation of the plastics, a stepwise flotation method was used. After the primary separation, PET and PC were discharged, while all plastics were individually separated and retained at high purity through the secondary separation process, resulting in 100% purity for both PET and PVC. PC and ABS can achieve 97.4% and 94.5% purity in triplicate validation tests, respectively. Surface modification mechanisms were investigated using X-ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FT-IR), and Scanning Electron Microscopy (SEM). Based on varying functional groups and surface potentials, PFS can adhere to different plastic surfaces for extended durations, creating the hydrophilicity difference. Nonhomogeneous adsorption of PFS on plastics surfaces was described by characterization and adsorption kinetics. The hydrophilization order and PFS adsorption capacity were consistent: PVC > ABS > PC > PET. The interaction between PFS and plastics was explained by density functional theory (DFT) simulations, the long-chain molecules and numerous hydroxyl groups primarily interact with the plastic surface through electrostatic forces and hydrogen bonds. Through optimization of the PFS treatment process, the consumption of the modification reagent was successfully reduced to 56.51 g/ton of waste plastic with the reuse of PFS. Our process optimization assessment highlights that PFS treatment is a highly effective method for recycling waste plastics.
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
JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Yuqi Tang,Mingzhao Zhu,Junhong Chen,Xuebiao Sun,Huan Li,Zhijie Hu,Suman Li,Qian Qu,Zejun Zhang,Yuanzhu Mi
The petroleum industry produces a large volume of water-in-oil (W/O) emulsion annually, which has detrimental consequences for both the industry and the environment. Therefore, effective demulsification of these emulsions is crucial. In current work, a low-temperature demulsifier (EBTA) for W/O emulsions was synthesized using PET waste plastic as starting materials through a simple method. Chemical structure of EBTA was characterized by FT-IR and 1 H NMR. The demulsification performance was assessed using bottle-test method, and a comprehensive examination was conducted on the influence of EBTA concentration, settling time, temperature, pH value, and salinity on the demulsifying efficiency (DE). At a low temperature of 40 ℃ and a concentration of 250 mg/L, EBTA achieved a DE of 95.36% in an Emul30 emulsion, while a DE of 100% could be obtained in an Emul70 emulsion. Furthermore, EBTA demonstrated excellent tolerance for salts, acids and alkalis. In addition, the demulsification mechanism of EBTA was investigated using various techniques, such as interfacial tension (IFT), zeta potential, three-phase contact angle and coalescence time of droplets. The results revealed that EBTA had a lower IFT and was easily adsorbed on the oil–water interface. This led to the damage of the interface film and facilitated the oil–water separation. Due to the simple and safe synthesis process and remarkable demulsification performance, EBTA is a promising demulsifier for separating W/O emulsions.
研究领域:
環境科學
·
石油化工
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Meng Xie,Hai Xu,YiXuan Wang,Helin Pan,Dengle Duan,Bo Niu,Donghui Long,Yayun Zhang
Metal oxides as promoting materials can convert waste plastics into hydrogen (H 2 ) fuel by microwave pyrolysis, solving ecological pollution worldwide, but their tendency of agglomeration and poor porosity limit further applications. Herein, we reported a two-dimensional (2D) metal oxide nanosheets with porous network for recycling high-purity hydrogen and carbon nanotubes from waste plastics in microwave-induced reaction. The 2D porous structure significantly improves the growing space of CNTs and enhances the ability of wave absorption, thereby exhibiting a remarkable H 2 selectivity of 87.5% and high H 2 yield of 60.2 mmol g −1 LDPE, as well as producing high-value CNTs. Moreover, the reaction mechanism for microwave-induced catalytic pyrolysis is proposed, where the Fe 2 O 3 particles on composites facilitated the breakage of C-H bonds, contributing to the generation of H 2 . The current work provides new insights into the recovery of waste plastics by metal oxides through microwave pyrolysis.
研究领域:
环境科学
·
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2025
·
IF 9.1
Miaoling Luo,Shanshan Shao,Yu Cao,Xiaohua Li,Shiliang Wu
TG analysis, kinetic model and fixed-bed experiments were applied in this study to explore the synergistic effect of rape straw (RS) and acrylonitrile-butadiene-styrene copolymer (ABS) in the co-catalytic pyrolysis. The results showed that the preferential pyrolysis of RS was favorable for the formation of some active radicals and decreased the pyrolysis temperature of ABS from about 400 °C to 350 °C. As the mixing ratio of ABS rose, the temperature range of co-pyrolysis decreased gradually. The interaction between the free radicals generated by RS and ABS was effectively promoted with the addition of HZSM-5, and also the aromatization was accelerated. The temperature range of co-pyrolysis was decreased from 350 °C to 400 °C–340 °C–380 °C. The Flynn-Wall Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) were used to build the kinetics model, and revealed that the activation energy of co-pyrolysis system reached the bottom with the mixing ratio was 1:1, indicating the strongest synergistic effect at this point. The synergistic action was revealed from the kinetic analysis. In the fixed-bed test, the yield of liquid phase (54.15 %) and monocyclic aromatic hydrocarbons (MAHs) (32.87 %) peaked at the mixing ratio of 1:1, at which the synergistic effect inhibited the conversion to polycyclic aromatic hydrocarbons (PAHs).
研究领域:
生物质能
·
高分子材料
·
热解技术
·
化学动力学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Ying Zhao,Jia Zhao,Qing Li,Chuantao Gu,Boying Zhang,Caihong Liu,Zheng Li,Shuozhen Hu,Shanlin Qiao
It is still a great challenge to design a simple, low-cost and highly active catalyst for the industrial production of hydrogen from water electrolysis. Herein, we report a synthesis of molybdenum disulphide (MoS 2 ) supported on carbon supports with high concentration of doped-nitrogen derived from large scale industrial waste plastics, i.e. melamine (CWM) and polyurethane (CWPU), by a simple hydrothermal reaction . Few layers of MoS 2 nanosheets with high catalytic activity can be very-well dispersed on CWM and CWPU. The supports with high‒nitrogen content can not only greatly improve the conductivity of supported MoS 2 nanosheets, but also provide additional active sites with the presence of high pyridinic‒N content. The synergistic effects between the MoS 2 nanosheet and CWM and CWPU contribute to high hydrogen evolution reaction (HER) activity. As the concentration of doped-N increases, the HER performance of MoS 2 -based catalysts is improved. MoS 2 /CWM 1:1 with the highest nitrogen content (11.1 wt %) shows the lowest overpotential of 56 mV at 10 mA cm −2 , the smallest Tafel slope of 36.6 mV·dec −1 , and the highest exchange current density of 0.35 mA cm −2 in acidic condition, which are comparable to that of commercial 20% Pt/C.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Shuhui Wei,Ali Reza Kamali
A mesoporous carbon nanostructure (MCN) with embedded Co 3 Fe 7 /CoFe 2 O 4 magnetic nanoparticles is synthesized by a clean and low-cost ball-milling/molten salt processing approach, employing metal oxides and waste plastic materials, without the involvement of environmentally-problematic raw materials or products. The structure, morphology and magnetic properties of MCN are analyzed by a variety of techniques. A systematic investigation is conducted to evaluate the performance of this nanostructured material as regenerable adsorbent for the efficient removal of methyl orange (MO) and methylene blue (MB) dyes from their aqueous solutions at various conditions, in terms of the dye concentration, the adsorbent dosage and the pH level of the solution. The dye adsorption of MCN is in accordance with the pseudo-second-order kinetic model and the Langmuir isothermal model with an excellent monolayer adsorption capacity of 278 and 238 mg/g for MB and MO, respectively. Moreover, the material is characterized to be ferromagnetic with the Ms value of 17.9 emu/g, ensuring the facile separation of the exhausted adsorbent from the treated water. The adsorption performance of MCN can be regenerated, with an adsorption capacity of greater than 95% of the original performance, after five successive regeneration cycles.
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 Cleaner Production
·
2022
·
IF 11.072
Meng Liu,Xiangzhe Yan,Lezhu Su,Hang Dong,Zhan Hu,Yuanqi Peng,Liqian Guan,Junjie Zhang,Zhi Zhou,Yongfa Zhu,Nan Zhou
Pyrolysis technology has been focused on waste plastics for recycling. However, there is rare research for reusing pyrolysis products (carbon nanotubes). Based on pyrolysis technology of waste polypropylene (PP) plastic, carbon nanotube coated Fe–Mo/MgO nanomaterial (CNT@Fe–Mo/MgO) was prepared by chemical vapor deposition to remove Gram-pathogenic bacteria. The addition of Mo and MgO promoted the cracking of PP plastic and the formation of MWCNTs. The as-obtained CNT@Fe–Mo/MgO can stimulate H 2 O/O 2 to produce abundant ·OH, ·O 2 − and 1 O 2 radicals, which probably resulting from the synergistic effect of delocalization of CNTs and REDOX pair of Fe 3 O 4 . Consequently, the removal rate of Escherichia coli and Staphylococcus aureus by CNT@Fe–Mo/MgO composite catalyst can reach 100% within 2h, without the help of any additional energy or active oxidant. At the same time, the material is remarkable stability and reusability with complete removal of pathogens after six cycles. This study not only provides a method for the synthesis of highly effective sterilizers , but also opens up a new direction for the application of functional carbon nanocomposites prepared by pyrolysis of waste plastics.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jiaxing Song,Jun Wang,Xudong Du,Yuhan Pan,Jingyuan Sima,Youqi Zhu,Qunxing Huang
Non-thermal plasma (NTP)-assisted catalytic pyrolysis is a promising technology for producing benzene, toluene, ethylbenzene, and xylene (BTEX) from mixed waste plastics. A primary challenge in this approach is the need to achieve a high selectivity for the target products. To address this challenge, this study focused on the preparation of Ga-modified zeolites. The results showed that Ga loading was effective in increasing BTEX yields for the zeolites of USY, β, and HZSM-5 by 7.49%, 4.72%, and 8.63%, respectively. Among these zeolites, HZSM-5-Ga-N 2 was the most suitable for catalyzing the NTP-assisted pyrolysis reaction to produce BTEX hydrocarbons, with a maximum selectivity of 63.19% and a maximum yield of 31.84%. This was because the pore of HZSM-5 matched the ring size of BTEX, and NTP improved the distribution of Ga 2 O 3 active sites, allowing more acidic active sites to participate in the catalytic reaction. This work provides an applicable solution to increase the selectivity and yield of BTEX from NTP-assisted pyrolysis of mixed waste plastics with Ga-loading catalysts.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）