ADVANCED POWDER TECHNOLOGY
·
2018
·
IF 2.943
Peng Liu,Rui Bao,Dong Fang,Jianhong Yi,Lanbo Li
Carbon nanotubes (CNTs)/Cu 2 O-CuO composite powder was fabricated by a spray pyrolysis (SP) method. The copper acetate monohydrate (Cu(CH 3 COO) 2 ·H 2 O) solution within CNTs dispersion was used as a precursor. The influences of decomposition temperatures, concentration of Cu(CH 3 COO) 2 solutions and CNTs mass fractions on the constituent phases and microstructures of the composite powder were investigated by XRD, FESEM, TEM, UV–Vis analysis methods. The results show that the composite powder prepared at 500 °C, with the concentration of 1.0 g/l Cu(CH 3 COO) 2 ·H 2 O and 30.0 wt.% CNTs mass fraction, has the best photocatalytic performance due to the numerous particles precipitated on the CNTs surface and lower recombination rate of the photogenerated electron-hole pairs. Furthermore, tentative mechanisms of the nucleation-growth and photodegradation properties were explored based on the microstructure and photocatalytic analysis.
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2019
·
IF 4.865
Shaobo Liu,Yunguo Liu,Luhua Jiang,Guangming Zeng,Ya Li,Zhiwei Zeng,Xiaohua Wang,Qimeng Ning
In this work, we demonstrated the preparation of the carbonized montmorillonite/carboxymethyl cellulose (MMT/CMC) hybrids and their application as an adsorbent for efficient removal of 17β-Estradiol (βE2). X-ray diffractometer (XRD) results showed that CMC intercalation reached saturation at a CMC to MMT weight ratio of 1; transmission electron microscope (TEM) measurements clearly revealed that carbonization caused graphenes distribute on the MMT surfaces; pyrolysis temperature at 600 °C yielded novel MMT/CMC sample of high surface areas as reflected by Brunauer-Emmett-Teller (BET) surface area. The adsorbed amount of βE2 under various conditions decreased in the order MMT/CMC 1:1 (600) > MMT/CMC 1:1 (450) > MMT/CMC 1:1 (300) ∼ MMT/CMC 2:1 (600) ∼ MMT > MMT/CMC 5:1 (600). The removal of βE2 by MMT/CMC 1:1 (600) occurred very quickly, and the adsorption kinetics could be well fitted by the Ritchie nth-order kinetic model ; the best-fit adsorption isotherm model was Freundlich model. The MMT/CMC 1:1 (600) also exhibited good regeneration performance after five adsorption/desorption cycles. The experimental results also showed that the adsorption of βE2 on the MMT/CMC 1:1 (600) composite could contribute to hydrophobic partitioning, π−π staking interaction, H-bond interaction, pore-filling effect and simple van der Waals interaction. This highly effective and novel adsorbent can be easily synthesized and regenerated, indicating its great potential in drinking and wastewater purification for endocrine disruptor compounds.
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DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Mingwei Xia,Wei Chen,Jing Wu,Yingquan Chen,Haiping Yang,Xu Chen,Danchen Zhu,Hanping Chen
Developing green, high efficient and precursor-universal pore tailoring approach is a major issue for biomass-derived porous carbon (BPC). In this study, the unique effect of organic salt porogen (potassium acetate) was first elucidated through investigating the component and temperature-dependent structure evolution of BPC during pyrolysis-activation process. Hydrogen bonding with biomass char rather than melting would facilitate the dispersion of porogen. Potassium acetate would catalyze cracking of biopolymers (<400 ℃) into H 2 , CO 2 , CO and CH 4 etc. and lead to plentiful macropores by gas blowing. And it decomposed into potassium species that etch the char to form micropores. Differently, cellulose and hemicellulose char intermediates with abundant carbonyl incline to retain the porous structure. BPCs from cellulose and hemicellulose possess specific surface area (SSA) ~ 1700 m 2 /g with nano-passages and three-dimensional layer framework structure. While lignin-derived BPC performs equally high SSA but bulky microporous structure. Besides, carbon layer would form from acetate decomposition and deposited on the char surface thus lead to similar surface structure. This study provides a novel insight of interaction between biomass char intermediate and organic salt porogen, which may demonstrate a precursor-universal and high efficient approach for BPC preparation.
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高影响因子
FUEL
·
2024
·
IF 6.7
Li Zhou,Fashe Li,Wenchao Wang,Huicong Zhang,Yaozong Duan,Hua Wang
Phospholipids, as key trace constituents of biodiesel, can have complex effects on the performance of biodiesel. Exploring the mechanism of their influence on the pyrolysis and oxidation characteristics of biodiesel is crucial for controlling the generation and emission of pollutants. To this end, this study employed TG-FTIR-MS experimental technology and the ReaxFF-MD simulation method to investigate the effects of phosphatidylethanolamine (PE) on the activation energy ( E a ), gaseous product generation, and mechanism of Jatropha biodiesel pyrolysis and oxidation reactions. The results indicated that the addition of 400 ppm PE can reduce the pyrolysis E a of Jatropha biodiesel from 87.25 kJ/mol to 80.67 kJ/mol, consistent with simulated E a of 93.35 kJ/mol and 81.81 kJ/mol, respectively. This notably promoted the initial oxidation stage of the Jatropha biodiesel reaction, facilitating the generation of oxidation products such as CO and C 2 H 4 . In the pyrolysis reaction, PE promoted C 2 H 4 formation, primarily through reactions involving hydrocarbon small free radicals. In the oxidation reaction, the addition of PE increased the number and variety of active free radicals in the system, with the formation reactions of H 2 O and CH 2 O involving phosphorus-containing oxygen groups. Furthermore, a small amount of nitrogenous free radicals participates in the formation reactions of C 2 H 4 and CO.
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Haifeng Jiang,Meng Song,Yuhang Li,Wei Jia,Jiahao Qi
Catalytic pyrolysis of waste plastics under nitrogen-rich conditions to produce nitrogenous compounds represents a highly promising technological approach. It can achieve high-value conversion of waste plastics and expand the synthesis process of nitrogenous products. This work uses polyethylene terephthalate (PET) as the raw material and urea as the nitrogen source to produce aromatic amines, and prepares Zn/CuCo 2 O 4 spinel catalysts to enhance the above synthesis process. The results indicate that the optimal mass ratio of PET and urea is 1:1, where the relative content of nitrogenous compounds in the liquid product reaches 86.69 %, and the selectivity of aromatic amines reaches 52.48 %. The addition of the spinel catalyst significantly improves the selectivity of aromatic amines. Compared with the CuCo 2 O 4 catalyst, ZnCo 2 O 4 exhibits superior catalytic conversion performance. The optimal addition ratio of the ZnCo 2 O 4 catalyst is 15 %, and the optimal pyrolysis temperature is 550 ℃. Under these conditions, the selectivity of aromatic amines increases by 11.11 % compared to non-catalytic pyrolysis. In addition, the obtained solid residue containing the used catalyst is considered as a potential adsorbent and can be applied in water treatment. It has significant removal ability for methylene blue dye. This work not only provides a feasible approach for the production of aromatic amines, but also provides important support for the high-value utilization of waste plastics.
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产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2017
·
IF 3.471
Yunwu Zheng,Fei Wang,Xiaoqin Yang,Yuanbo Huang,Can Liu,Zhifeng Zheng,Jiyou Gu
The main objective of this work was to study aromatics production via the catalytic pyrolysis upgrading of biomass using metal-loaded modified H-ZSM-5. M-ZSM-5 catalysts were prepared through the impregnation method with Zn, Ga, Ni, Co, Mg and Cu. The prepared M-ZSM-5 catalysts were evaluated by x-ray diffraction, thermal desorption spectroscopy and scanning electron microscopy. The properties, composition and product distribution of bio-oil were also analysed. Results showed that the M-ZSM-5 catalysts yielded a higher amount of non-condensable gas at the expense of the liquid yields. The Ga-ZSM-5 catalysts produced the highest yields of bio-oil (25.76 wt%), but the lowest amount of coke (22.08 wt%) compared with the unmodified ZSM-5 catalyst (33.38 wt%). The content of the single-ring aromatics prepared by using the Zn-ZSM-5 catalysts was the highest at 90.28 wt%, whereas that of the polycyclic aromatic hydrocarbon prepared by the Ni-ZSM-5 catalysts was the highest at 31.36 wt%. Moreover, the selectivity of the single-ring aromatic hydrocarbons, such as C7 and C8, were significantly affected by the use of the M-ZSM-5 catalysts. The Zn-ZSM-5 catalysts were the most selective for toluene and xylenes with contents of 36.52 wt% and 35.32 wt%, respectively, whereas the Co-based catalysts were the most selective for indene. The Ni-based catalysts can obviously improve the selectivities of benzene production and C10+ polycyclic aromatic hydrocarbons. Zn-ZSM-5 was the most effective catalyst that can be used in the production of aromatic hydrocarbons.
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DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Fangyan Liu,Zixing Wang,Haitao Zhang,Long Jin,Xiang Chu,Bingni Gu,Haichao Huang,Weiqing Yang
The O-N-S co-doped hierarchical porous carbons are prepared by direct pyrolysis of kraft lignin which is the byproduct from papermaking black liquor . The proposed preparation method is extremely facile, green-environmental, and low-cost without any additional activating agents, additives or templates. The kraft lignin-derived carbon materials possess large specific surface areas (338−1307 m 2 g −1 ), hierarchical porous structures and abundant multi-heteroatoms co-doping (9.84–19.91 wt%). Benefiting from above synergistic advantages, the as-fabricated symmetric supercapacitor in aqueous electrolyte delivers a high specific capacitance of 244.5 F g −1 at 0.2 A g −1 , excellent rate-capability (81.8% retention of initial capacitance at 40.0 A g −1 ), and outstanding cycling stability (91.6% retention over 10000 cycles). Importantly, this device in aqueous electrolyte delivers an energy density of 8.5 W h kg −1 at a power density of 100 W kg −1 . Furthermore, a remarkable energy density of 66.8 W h kg −1 at a power density of 1.75 kW kg −1 has been achieved and 32.2 W h kg −1 is still maintained even at an ultrahigh power density of 40.0 kW kg −1 when ionic liquid serves as electrolyte. This study demonstrates the successful conversion of low-valued natural biomass derivative into sustainable high-performance supercapacitor electrode materials with a simple, low-cost, and green-environmental production process.
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高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2017
·Vol. 26
·期 4
·1559-1572
·
IF 1.877
Wang Jianguo,Chen Nan,Li Miao,Feng Chuanping
In this study, a novel adsorbent was developed by loading polypyrrole (PPy) onto biochar (BC) prepared by slow pyrolysis of pomelo peel. This PPy-grafted BC mainly exhibited anion-exchange behavior, which dramatically increased fluoride adsorption capacity. The effects of various factors (adsorbent dosage, pyrrole concentration, initial solution pH, co-existing anions and temperature) on the fluoride adsorption were investigated. The adsorbent was characterized by scanning electronic microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and automatic titration methods. Results showed that the optimized adsorbent (BP-0.1) performed excellently at pH 2.8–10.0, and possessed positive charge at pH < 8.6. The adsorption isotherm data were fitted well by the Langmuir model and the maximum adsorption capacity was 18.52 mg/g at 25 ± 2 °C. The adsorption kinetics followed the pseudo-second-order model and adsorption equilibrium was achieved at 24 h. Although both HCO 3
− and CO 3
2− had great influence on F − adsorption, there was no significant impact in the presence of Cl − , NO 3
− and SO 4
2− . Real groundwater study showed that 2.5 g/L of BP-0.1 could effectively reduce F − from 10.0 to 1.4 mg/L at pH 5.0. Thermodynamic parameters confirmed the spontaneous and endothermic nature of the adsorption process. Effect of pH, XPS analysis and the change of amount between Cl − and F − in the adsorption process revealed that ion exchange and electrostatic attraction were involved in the adsorption process and ion exchange was the main adsorption mechanism.
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高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Xiongjian Du,Shubin Wu,Tengfei Li,Yihui Yin,Jingmo Zhou
To enhance the efficiency and environmentally friendliness of the pyrolysis of lignin, we investigated the effects of ozone oxidation pretreatment on the softwood lignin structure and pyrolysis product distribution during the pyrolysis process. Fundamental characteristic analysis shows that the structure of lignin after pretreatment changed compared with that of the original lignin. The lignin side chain hydroxyl was oxidized to carbonyl or carboxyl, enhancing the depolymerization of lignin. 2D HSQC NMR analysis reveals that pretreatment mainly interrupted unstable chemical bonds like ether linkage of lignin. In order to determine the effect of pretreatment on pyrolysis, the pyrolysis experiment was performed on raw and pretreated lignin separately. Results showed that the pretreatment improves the yield of bio-oil from lignin pyrolysis. Furthermore, the relative content of p -hydroxyphenyl type phenols derived from lignin pyrolysis is positively correlated with the oxidation degree. Thus, the pretreatment has great potential in improving aromatic production during pyrolysis of lignin, and could selectively transform lignin to high value-added platform compounds.
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Yu Xiang,Huiying Zhang,Shuhan Yu,Jinzhi Ni,Ran Wei,Weifeng Chen
Presently, as the prevalent pyrolysis atmospheres, N 2 is widely used, while air-limitation and CO 2 are rarely considered, to produce biochar to adsorb tetracycline. This study thus used N 2 , CO 2 , and air-limitation to produce various biochars at 300 ∼ 750 °C, and explored their structure-performance relationship for tetracycline sorption. The maximum sorption capacities of biochars produced in CO 2 and air-limitation were 55.36 mg/g and 71.11 mg/g (at 750 °C), respectively, being 2.34 and 3.01 times that of biochars produced in N 2 (23.60 mg/g at 750 °C). Interestingly, except for high pore volume and specific surface area supported pore filling and sites providing effect, ash (containing metal cations, P-O, and S=O) induced complexing effect was the primary mechanism for tetracycline sorption, rather than hydrophobic effect, π-π interaction, and hydrogen bond caused by C composition. This study provides important information about adjusting the pyrolysis atmosphere to improve the sorption performance of biochar toward tetracycline.
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Dongmei Lv,Shibiao Su,Shifan Zhang,Dandan Cai
The anchor of functional materials on metal-organic frameworks (MOFs) nanosheets to precisely construct fascinated heterostructures for electrocatalysis is highly promising but challenging owing to the different interfacial thermodynamics and nucleation kinetics. In this work, we design and synthesize ultrafine metal oxides nanoparticles (NPs) homogenously distributed on cobalt-based MOF (Co-MOF) nanosheets for oxygen evolution reaction (OER) by a facile solvothermal reaction and subsequent partially controlled pyrolysis. The ultrafine Co 3 O 4 NPs with a particle size of about 1.5 nm can be obtained from the dispersed elemental Co in Co-MOF and uniformly generated on the surface of the MOF, which is crucial for the formation of the unique heterostructure. The well-designed Co-MOF-350 exhibits an efficient electrocatalytic activity with a low overpotential of 239 mV at a current density of 10 mA cm −2 and a small Tafel slope of 63 mV dec −1 , and an outstanding catalytic stability for OER, much superior to the pure Co-MOF and Co 3 O 4 electrocatalyst . The intriguing OER performance mainly originates from the desirable combination of the abundant active sites, the extended electron transport channel between ultrafine metal oxides and Co-MOF nanosheets. More importantly, the work will help to design novel heteroarchitectured MOFs-based composites as efficient and robust electrocatalysts for practical applications.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Kun Liu,Chaoyang Shi,Juan Yu,Enze Zhu,Zhimin Li,Chengxu Zhang,Wei Li,Xikun Yang,Yingjie Zhang,Mingli Xu
Transition metal-based compounds, due to their excellent ORR catalytic performance under alkaline condition, have recently emerged as one of the most promising alternatives to noble metal-based ORR catalysts. It is worth noting that manganese oxide can take an unique advantage for decomposition of intermediate adsorption products H 2 O 2 and can effectively reduce O 2 to OH − . However, most research has focused on MnO 2 , while attention has rarely been paid to MnO catalysts. In addition, under high-temperature pyrolysis condition, MnO is the most stable manganese oxide but MnO nanoparticles easily agglomerate. Hence, it is very difficult to obtain well-dispersed and small-sized MnO nanoparticles. Herein, on the basis of pre-synthesizing uniformly distributed manganese complexes on the reduced graphene oxide (rGO), we innovatively prepare highly dispersed and small-sized MnO nanoparticles (~3.94 nm) via high-temperature pyrolysis, which are uniformly anchored on N-doped reduced graphene oxide (NrGO) as an efficient oxygen reduction electrocatalyst . The as-obtained MnO/NrGO (1050 °C) electrocatalyst achieves satisfactory onset potential (0.942 V) and half-wave potential (0.820 V) under alkaline condition. And the limiting current density is 4.17 mA cm −2 , which is very close to that of Pt/C (20 wt%, JM). Meanwhile, MnO/NrGO (1050 °C) catalyst presents superior longstanding durability and methanol resistance than Pt/C (JM). This work indicates that high-temperature pyrolysis can improve the purity of manganese oxide, simultaneously the defects of NrGO can reduce particle size of MnO nanoparticles, which are greatly beneficial to improve ORR performance. This work provides a new idea for research of MnO catalysts for ORR in the future.
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高影响因子
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