COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Shihao Miao,Yuanguang Zhang,Hongyu Xia,Hongcheng Gao,Weihao Tao,Zhenzhu Zhang,Chenyu Huang,Lin Huang
In the study, highly N-doped metal organic framework (MOFs) derived CoFeN photocatalysts (CoFeN-N) were successfully prepared by using carbon nitride (g-C 3 N 4 ) nanosheets as the support with simultaneous additional N source. CoFeN-N activated hydrogen peroxide (H 2 O 2 ) was used to remove Methyl orange (MO) and Tetracycline hydrochloride (TC-HCl) in water under simulated visible light . N doping improves the photo-Fenton degradation ability of CoFeN to varying degrees, and the photocatalyst with the best performance is CoFeN-N2. The degradation rate constants (K) of MO and TC-HCl are 1.8 and 5.1 times of CoFeN, respectively. CoFeN-N2 did not significantly inhibit the degradation efficiency of organic pollutants under acidic, neutral and alkaline conditions. Meanwhile, the presence of coexisting anions (Cl − 、HCO 3 - and HPO 4 2- ) in water similarly does not obviously reduce the degradation ability of CoFeN-N2 for MO and TC-HCl, which indicates the excellent anti-interference ability of the prepared photocatalyst. The TOC test results indicate that CoFeN-N2 has excellent mineralization ability for organic contaminants. In addition, hydroxyl radicals , superoxide radicals, and holes (·OH, ·O 2 - and h + ) were demonstrated to be the primary active species for the degradation of organic pollutants by CoFeN-N2 through free radical trapping experiments and EPR tests. This work provides an attractive strategy for the preparation of highly N-doped photocatalysts and the efficient removal of organic pollutants from water by photo-Fenton coupling.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2018
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IF 3.468
Changsong Hu,Huiyan Zhang,Rui Xiao
In order to inhibit the coke formation on the external surface of HZSM-5 during catalytic fast pyrolysis (CFP) of biomass, core-shell structured HZSM-5@silicalite-1 zeolite catalysts were hydrothermally synthesized through the growth of silicalite-1 along the surface of a commercial HZSM-5. The catalyst characterization results indicate that silicalite-1 outer shell layer was successfully formed on the HZSM-5 core particles. Silicalite-1 coating was proved to be effective to reduce the external acidity as well as keep the internal acidity and channel patency of core HZSM-5 by catalytic probe reactions. The catalytic performances of HZSM-5@silicalite-1 samples in CFP of biomass were investigated using a bench-scale continuous feeding two-stage fluidized-bed/fixed-bed combination reactor. The results show that the productions of olefins and BTX were promoted (especially BTX), while the formations of catalyst coke and PAHs were significantly inhibited after silicalite-1 coating.
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CRYSTENGCOMM
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2018
·Vol. 21
·期 11
·1691-1700
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IF 3.304
Zhikun Wang,Wenfeng Han,Huazhang Liu
Uniform, free-standing and cubic SrF2 microparticles were successfully fabricated by a facile hydrothermal method with ethylenediaminetetraacetic acid (EDTA) as the chelating agent. The influences of preparation conditions, such as the pH value, amount of EDTA and hydrothermal time, on the formation of SrF2 crystals were investigated. The formation mechanism of cubic SrF2 particles was proposed based on the experimental results. Following calcination in air at 500 °C, SrF2 particles were evaluated as the catalyst for the pyrolysis of 1-chloro-1,1-difluoroethane (HCFC-142b, CH3CClF2) to vinylidene fluoride (VDF, CH2CF2) at 350 °C and a space velocity of 600 h−1. The results indicate that SrF2 cubes exhibit high catalytic activity with a HCFC-142b conversion of about 70% and a selectivity to VDF of 80–87%. No significant deactivation was observed within the time on stream of 30 h. With the reaction temperature increased to 450 °C, the conversion of HCFC-142b is close to 94%, while the selectivity to VDF remains almost unchanged. Although the SrF2 catalyst prepared by the conventional precipitation method also shows high conversion, its selectivity to VDF is only around 50–70%. We suggest that the surface acidity and specific surface area play major roles in the catalytic performance. Compared with the temperatures for industrial manufacture of VDF of 650–700 °C, the SrF2 catalysts provide a promising pathway to produce VDF at much lower temperatures.
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Materials Science & Engineering C-Materials for Biological Applications
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2019
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IF 4.959
Jin Feng,Qingshan Shi,Yulian Li,Jianfei Huang,Ruimin Li,Xiulin Shu,Wenru Li,Xiaobao Xie
Nanocomposites composed of Ag and γ-Fe 2 O 3 nanoparticles within poly-γ-glutamic acid (γ-PGA) derived amorphous carbon nitride (a-CN) films (Ag + γ-Fe 2 O 3 @a-CN) were synthesized by a one-step facile pyrolysis strategy. Transmission electron microscopy analysis shows that Ag and γ-Fe 2 O 3 nanoparticles were obtained in situ and homogeneously dispersed on the a-CN matrix. The average size of nanoparticles was 8.1 nm. The presence of γ-Fe 2 O 3 , Ag, and a-CN in the nanocomposite was confirmed by X-ray diffraction analysis, UV–visible absorption spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. Ag + γ-Fe 2 O 3 @a-CN catalyzed the degradation of methyl orange. This catalyst was also recycled ten times by magnetic separation without any loss in efficiency. Ag + γ-Fe 2 O 3 @a-CN exhibited strong antibacterial activity against E . coli and S . aureus . It also exhibited excellent antibacterial activity even after 20 times magnetic recycling. This indicates that this is a promising recyclable antibacterial and catalyst for environmental applications.
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FUEL PROCESSING TECHNOLOGY
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2019
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IF 4.507
Xiaona Lin,Lingshuai Kong,Hongzhen Cai,Qingfa Zhang,Dongmei Bi,Weiming Yi
The effects of the type and content of alkali/alkaline earth metals (AAEMs) on the co-pyrolysis of cellulose/high density polyethylene (HDPE) were studied using TGA and Py-GC/MS. AAEMs showed different effects on the decomposition characteristics of cellulose/HDPE mixtures. During cellulose/HDPE co-pyrolysis, AAEMs present in char could act as a base catalyst, with different catalytic effect on products distribution depending on the types of AAEMs. Na showed stronger catalytic cracking effect to promote alkenes formation compared to the use of K, Ca, and Mg. The comparison of experimental and calculated products distributions of raw cellulose/HDPE confirmed the existence of synergistic effect , which facilitated the cleavage of glycosidic linkages to form anhydrosugars and promoted the scission of HDPE chains to produce hydrocarbons. The effect of potassium on this synergy was also investigated. With increased potassium content, the yields of anhydrosugars and hydrocarbons decreased while the yields of furans and ketones increased, suggesting that potassium inhibited the cleavage of glycosidic bonds and promoted ring-opening reactions. This indicated that addition of potassium inhibited the synergy between cellulose and HDPE.
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BIORESOURCE TECHNOLOGY
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2019
·
IF 6.669
Yunqiang Yi,Guoquan Tu,Dongye Zhao,Pokeung Eric Tsang,Zhanqiang Fang
In this study, Fenton-like catalysts (magnetic biochar) were synthesised by pyrolysis the different biomass pre-impregnated with steel pickling waste liquor. The results of degradation of metronidazole illustrated that the catalytic performance of magnetic biochar was significantly affected by biomass feedstocks. Electron spin resonance (ESR) and radical quenching experiments showed that the hydroxide radicals ( OH) were the key reactive oxygen species responsible for the metronidazole removal. Levels of OH varied among different systems consistent with the removal of metronidazole. The activation of H 2 O 2 by carbon-containing components and Fe species (Fe 2 O 3 and Fe 3 O 4 ) in magnetic biochar were confirmed to be less crucial to the degradation of metronidazole. Moreover, the Fe(II) (FeO) in magnetic biochar played the dominating role in degradation of metronidazole, and the Fe(II) content difference caused by biomass feedstocks was responsible for differences in the catalytic performance of different types of magnetic biochar.
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JOURNAL OF THE ENERGY INSTITUTE
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2024
·
IF 5.6
Xu Zhao,Fuxin Yang,Wentao Li,Houzhang Tan,Lijuan Gao,Yanhao Jiao
With the urbanization and population growth, the disposal of plastic waste has become a significant challenge, as the traditional methods often result in pollution and resource wastage. Pyrolysis technology offers a sustainable solution by converting the waste plastics into valuable gas or liquid fuels. The co-pyrolysis of plastics and biomass is an effective approach for synergistically managing these two types of solid waste. The polyethylene (PE) and salix psammophila (SP) was used to investigate the gas production characteristics and polycyclic aromatic hydrocarbons (PAHs) formation during the co-pyrolysis. Additionally, Cu/ZSM-5, Co/ZSM-5, and Ni/ZSM-5 catalysts were employed to investigate the effects of different metal-loaded catalysts on the co-pyrolysis process. The results indicate that, with the increase of the pyrolysis temperature, the yield of gas-phase products gradually increases, solid residue decreases, and liquid-phase products initially increase before declining, reaching their maximum at 500 °C. The synergistic effect promotes the formation of C 2 H m (C 2 H 2 , C 2 H 4 , C 2 H 6 ) and CH 4 , leading to the increase of the gas-phase product yields compared to the individual pyrolysis. The addition of catalysts further enhances the gas production: Cu/ZSM-5 boosts H 2 yield, Co/ZSM-5 shows selectivity for CH 4 and C 2 H m , and Ni/ZSM-5 exhibits better selectivity for CO and H 2 . Under the various pyrolysis conditions, aromatic compounds and aliphatic hydrocarbons consistently dominate the liquid-phase products. With the increase of the pyrolysis temperature, the proportion of aliphatic hydrocarbons decreases, while the proportion of aromatic compounds increases. The addition of catalysts reduces the proportions of both aliphatic and aromatic compounds. PAHs generation is temperature-dependent, significantly increasing at 700 °C. At the low pyrolysis temperatures, the co-pyrolysis reduces PAHs yield, but at high temperatures, PAHs formation increases. The addition of catalysts decreases PAHs yield and toxicity equivalency. Cu/ZSM-5 promotes the cracking of two-ring PAHs, reducing two-ring PAHs yield. Co and Ni catalysts enhance the selective aromatization of small hydrocarbon molecules, forming low-ring PAHs and limiting PAHs aggregation. Overall, Ni/ZSM-5 demonstrates the best performance in enhancing gas production and reducing PAHs emissions, followed by Co/ZSM-5 and Cu/ZSM-5.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2025
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IF 7.8
Zhentao Wang,Jian Zhang,Shanshan Guo,Yufei Cai,Ling Ma,Yuting Huang,Shucheng Wu,Weibing Wu,Weirong Zhao
Biomass catalytic pyrolysis for the production of aromatics as an alternative to petrochemical resources is a promising technology in the context of carbon neutrality. The aromatization of furans presents a novel pathway for converting biomass into aromatics. In this study, four binary molten chlorides (NaCl-FeCl 2 , NaCl-MnCl 2 , NaCl-ZnCl 2 , and NaCl-MgCl 2 ) were selected for the pyrolysis of pine sawdust. The thermal stability and eutectic points of the binary molten chlorides were tested by TG-DSC. The introduction of binary molten chlorides significantly increased the selectivity for furans in bio-oil, reaching 72.2–91.8 area% for NaCl-ZnCl 2 and 42.8–71.2 area% for NaCl-FeCl 2 . Commercial HZSM-5 was characterized by SEM, XRD, BET, NH 3 -TPD, and Py-IR, and HZSM-5/cordierite monolithic catalysts were prepared. Co-pyrolysis of pine sawdust and polypropylene in binary molten chlorides were conducted, combined with in-situ or ex-situ catalytic processes. Furans generated from the pyrolysis of pine sawdust in binary molten chlorides served as key intermediates for the production of aromatics with high selectivity in a single step. In ex-situ catalytic pyrolysis, the highest selectivity for aromatics reached 91.2 area%. The van Krevelen diagram indicated that the aromatics from bio-oil had the potential to substitute ethylene tar in carbon black production. Diels–Alder reactions were discussed in the proposed reaction pathways for catalytic co-pyrolysis.
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FUEL
·
2024
·
IF 6.7
Cheng Hou,Xinnan Zheng,Yuanbo Song,Duanyang Shangguan,Jiang Zhao,Xuefei Zhou,Yalei Zhang,Zheng Shen
To upgrade microalgae pyrolysis oil, the effects of polyethylene (PE) chain structure and microalgae component on microwave-assisted co-pyrolysis of PE and microalgae were investigated using high-density polyethylene (HD), low-density polyethylene (LD), and linear low-density polyethylene (LLD), as well as microalgae rich in proteins (M), lipids (ML), and carbohydrates (MC). Co-pyrolysis with PE promoted bio-oil production but hindered gas generation. Moreover, the interactions within MC-HD and M-LLD exhibited a stronger promoting effect on bio-oil production compared to the other co-pyrolysis groups. Interestingly, co-pyrolysis with HD (M-HD, MC-HD, and ML-HD) resulted in a significant reduction in nitrogen content (0.85–1.68 wt%) and an increase in oxygen content (33.75–47.40 wt%) in the bio-oils, contrasting with the nitrogen (3.42–9.92 wt%) and oxygen (14.41–23.08 wt%) levels observed in the bio-oils from individual pyrolysis of microalgae, attributable to the formation of long-chain alcohols and esters. Moreover, the bio-oils from LD and LLD co-pyrolysis (M-LD, M-LLD) had slightly higher nitrogen content (2.27 and 2.60 wt%) but much lower oxygen content (19.37 and 17.96 wt%) compared to the bio-oils from HD co-pyrolysis. In general, the long main chains of PE contributed to reducing nitrogen content while increasing oxygen content of the bio-oils, and the branched chains could alleviate the increase in oxygen content. This study provides new insights for the high-value utilization and eco-friendly utilization of microalgae and PE.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Zhaotian Chen,Juan Wang,Sibudjing Kawi,Qin Zhong
Developing high-efficiency bifunctional electrocatalysts capable of overcoming the sluggish kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is an urgent challenge for rechargeable zinc-air batteries (RZABs). Herein, we successfully prepared an excellent bifunctional catalysts through facile pyrolysis-free method. Nickel/iron layered double hydroxide (NiFe-LDH) with OER activity was in situ grown on carbon nanotubes (CNTs) and iron (II) phthalocyanine (FePc) with ORR activity was introduced through π-π interaction and covalent functionalization. Furthermore, the intervention of CNTs transform the electronic structure of NiFe-LDH to further enhance OER activity, while solve the problems of poor electrical conductivity and aggregation of FePc. The prepared bifunctional catalyst FePc-LDH@CNTs exhibits preeminent electrocatalystic performance for ORR ( E 1/2 = 0.815 V) as well as OER ( E j=10 = 1.447 V). It displays a prominent bifunctionality which Δ E is only 0.632 V. Moreover, the liquid RZABs based on the FePc-LDH@CNTs demonstrate a significant specific capacity (810.4 mAh g −1 ) and robust stability (840 h), superior to commerical Pt/C + RuO 2 . As flexible RZABs, it maintains superb stability (100 h) and can drive water splitting to produce H 2 smoothly. In addition, the reasons for the failure are dissected by analyzing the components of the battery after cycles. This study provides a novel facile direction to prepare high-efficient and stable bifunctional oxygen electrocatalysts without pyrolysis.
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JOURNAL OF CHROMATOGRAPHY A
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2025
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IF 4
Tiefeng Xu,Xiangjie Meng,Gangqiang Wang,Wangyang Lu
The identification of cellulose fibers from different sources remains a significant challenge across various fields due to their complex structural composition and diverse applications. In this study, pyrolysis gas chromatography/high-resolution mass spectrometry (Py-GC/HRMS) was employed to identify cellulose fibers and fabrics utilizing a relative ratio approach based on pyrolyzate yield, with levoglucosan (LG) as the primary peak, furfural (FF) and 5-methyl-2(3H)-furanone (α-AL) as reference peaks. Initially, four cellulose fibers had large discrepancies in pyrolyzate yield relative ratios when pyrolyzed at 600°C. The FF to LG ratios were 0.58-0.83 for cotton, 0.25-0.35 for flax, 0.14-0.18 for viscose, and 0.05-0.07 for tencel, while the α-AL to LG ratios were 0.64-0.88 for cotton, 0.29-0.38 for flax, 0.18-0.22 for viscose, and 0.03-0.05 for tencel. The relative proportion of fabrics has significantly decreased compared to fibers, which indicated that the manufacturing process affected the fiber components. It confirmed that alkaline bleaching can effectively eliminate fiber impurities and enhance cellulose content, which contribute to the increase of LG yield and the decrease of relative ratio. This work marks the inaugural differentiation of four cellulose fibers and fabrics using Py-GC/HRMS, offering a valuable methodology and pivotal reference data for future investigations in the field.
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Journal of Water Process Engineering
·
2023
·
IF 7
Qiang Qu,Ling Qiu,Ming-Zhuo Li,Guo-Tao Sun,He-Yu Chen,Xiao-Hui Guo
Magnetic biochar was successfully prepared from the waste Zanthoxylum branch and applied for Cr (VI) removal from wastewater. Modification parameters including concentration of iron-containing solution, ratio of Fe (III)/Fe (II), and pyrolysis temperatures were systematically investigated. There was a synergistic effect of synthesis conditions on the porous structure and the form distribution of iron. Based on the adsorption experiments, 900MZB8–1 displayed the best Cr (VI) removal performance (42.68 mg/g). The fitting result confirmed that the Cr (VI) removal reaction was the homogeneous chemisorption , and the predicted maximum removal capacity could reach at 215.44 mg/g. Moreover, the XPS analysis indicated that 79 % of Cr (VI) on adsorbent surface was transformed to Cr (III) by the cooperation of oxygen-containing functional groups and reductive iron. Meanwhile, 900MZB8–1 maintained the eminent removal efficiency of 80.65 % after four regeneration cycles. Additionally, the economic feasibility and practical performance indicated the rich-potential adsorbent for Cr (VI) removal.
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