INDUSTRIAL CROPS AND PRODUCTS
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2023
·
IF 5.9
Xiaoxuan Ma,Tianyang Guo,Peng Fu,Zhiyu Li,Kaiwei Sun,Liang Zheng,Huiyan Zhang
Aromatic hydrocarbons (AHs) production from in-situ catalytic co-pyrolysis (CCP) of biomass and plastics is a promising technology. However, the combined effects of the mixing mode and proportion of raw materials in catalytic co-pyrolysis and the double-size effect of micro-mesoporous core-shell catalysts on AHs production remain questionable. The formation characteristics and mechanism of AHs in CCP process were studied from mass transfer and free radial direction. The results showed that the yield of BTEX (benzene, toluene, ethylbenzene, and xylene) was 20.44 wt% when the mass ratio of cellulose/polyethylene/cellulose (C-P-C) was 0.5:1:0.5 at 500 ℃. The free radicals generated during the breaking of polyethylene bonds can promote the transfer of hydrogen atoms to cellulose pyrolysis intermediates, which results in mass transfer effect. The C-P-C loading mode makes hydrogen atoms always pass through the cellulose without escaping, and the increase of polyethylene ratio makes the number of hydrogen free radicals increase significantly, both of which jointly regulate the hydrogen free radical mass transfer efficiency. However, the high concentration of hydrogen free radicals can quench the pyrolysis of cellulose. The conjugated double size effect of ZSM-5 @MCM-41 leads to their greater catalytic capacity for free radical carrying co-pyrolysis products compared to ZSM-5. With the increase of mesoporous shell, the yield of BTEX increases first and then decreases, but the yield of coke is opposite. The BTEX yield of 1.0SH-Z5 @ M41 is 3.15 times that of ZSM-5, and the coke yield is only 14.70% that of ZSM-5. The reaction pathway of promoting cellulose pyrolysis by polyethylene and the mechanism of hydrogen free radical - mass transfer co-pyrolysis involved were put forward.
研究领域:
能源与环境科学
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催化化学
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DOI
高影响因子
BIODEGRADATION
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2016
·Vol. 27
·期 1
·37-46
·
IF 2.208
Zhou YuYang,Huang Huanlin,Shen Dongsheng
This study evaluated substrate interactions during the aerobic biodegradation of 1, 4-dioxane and BTEX mixtures by a pure culture, Acinetobacter baumannii DD1, which is capable of utilizing 1, 4-dioxane for growth. A. baumannii DD1 could utilize BTEX as a sole carbon source, but could not utilize m -xylene and p -xylene. In binary mixtures, there was a lag of about 14 h before the degradation of BTE, and 1, 4-dioxane only started to be utilized when BTE was completely degraded by 1, 4-dioxane-grown DD1. Furthermore, the biodegradation rate of 1, 4-dioxane decreased from 73.33 to 40.74 mg/(h g dry weight) after the biodegradation of benzene. 1, 4-dioxane could not be degraded after the biodegradation of o -xylene in 80 h. DD1 could also not degrade m -xylene and p -xylene coexisting with 1, 4-dioxane. The ability of DD1 to degrade BTEX occurred in the following order: benzene > ethylbenzene > toluene > o -xylene > m -xylene = p -xylene. The biodegradation of 1, 4-dioxane was not activated in the mixture with o -xylene, primarily because of the accumulation of the specific toxic intermediate, 2, 3-dimethylphenol. The lag in BTE degradation was presumably because of the induction of enzymes necessary for BTE degradation. Additionally, SDS-PAGE analysis demonstrated that there were different proteins during the degradation of benzene and 1, 4-dioxane.
研究领域:
环境微生物学
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生物修复
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生物化学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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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
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化学工程
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Xiao-Qin Yang,Li-Qing Yu,Lan-Fen Li,Yun-Kai Lv
Background The practical application of moisture sensitive metal organic frameworks (MOFs) in extraction technology faces challenges related to competitive adsorption and water stability. The target analytes cannot be effectively extracted under humid conditions due to the competitive moisture adsorption and/or framework structure collapse of MOFs. In this study, the microporous organic networks (MONs) were synthesized through Sonogashira coupling reaction to use for hydrophobic modification on the surface of MOF-199. Results The MOF-199@MON as coating was deposited on stainless steel wires for solid-phase microextraction (SPME) of benzene series (BTEX) in aqueous environments. Under the optimal extraction conditions, the MOF-199@MON coated fiber for SPME coupled with GC-MS for the determination of BTEX gave the linear range of 0.5–500 μg L −1 , the limit of detections (LODs, S/N = 3) of 0.01–0.04 μg L −1 , the limit of quantifications (LOQs, S/N = 10) of 0.04–0.12 μg L −1 , the enhancement factors of 3567–4878, and the intra-day, inter-day and fiber-to-fiber precisions (relative standard deviations, RSDs) of 1.0–9.8, 1.9–7.9 and 4.5–9.5 %, respectively. The developed method was successfully applied to the analysis of BTEX in water samples with the recoveries of 71.0 %–113 %. Significance This work reveals the home-made SPME fibers have a long service life (the extraction efficiency of fiber decreased by only 7.26 %−13.14 % after 100 cycles). The potential of MON functionalized MOFs as effective adsorbents for the SPME of pollutants in the water environment.
研究领域:
分析化学
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材料科学
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环境科学
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DOI
PubMed
高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 14
·8800
·
IF 4.614
Tianyu Chen,Yan Wu,Jinnan Wang,Corvini François-Xavier Philippe
By using compound-specific isotope analysis (CSIA) in combination with high-throughput sequencing analysis (HTS), we successfully evaluated the benzene and toluene biodegradation in a bio-permeable reactive barrier (bio-PRB) and the stress response of the microbial community. Under stress conditions, a greater decline in the biodegradation rate of BTEX was observed compared with the apparent removal rate. Both an increase in the influent concentration and the addition of trichloroethylene (TCE) inhibited benzene biodegradation, while toluene biodegradation was inhibited by TCE. Regarding the stress response, the relative abundance of the dominant bacterial community responsible for the biodegradation of BTEX increased with the influent concentration. However, the dominant bacterial community did not change, and its relative abundance was restored after the influent concentration decreased. On the contrary, the addition of TCE significantly changed the bacterial community, withAminicenantesbecoming the dominant phyla for co-metabolizing TCE and BTEX. Thus, TCE had a more significant influence on the bio-PRB than an increasing influent concentration, although these two stress conditions showed a similar degree of influence on the apparent removal rate of benzene and toluene. The present work not only provides a new method for accurately evaluating the biodegradation performance and microbial community in a bio-PRB, but also expands the application of compound-specific isotope analysis in the biological treatment of wastewater.Keywords:bio-permeable reactive barrier;biodegradation;BTEX;compound-specific isotope analysis;high-throughput sequencing analysis
研究领域:
环境科学
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微生物学
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分析化学
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DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Kezhen Qian,Wenmin Tian,Siwei Yan,Wentao Li,Lijie Yin,Derun Guo,Zixu Yang,Dezhen Chen,Yuheng Feng
The effects of pretreatment and structure of zeolite on aromatization of high-density polyethylene (HDPE) and polypropylene (PP) over different Ga-promoted zeolites (HZSM-5, hierarchical HZSM-5, HY, Hβ, and USY) were investigated. Hydrogen reduction of Ga-promoted HZSM-5 resulted in a higher yield of alkenes during HDPE pyrolysis but did not lead to increased production of total aromatic hydrocarbons. The reduction and subsequent oxidation of Ga/Z5 led to the formation of GaO + species with high dehydrogenation activity. This resulted in a remarkable 65% yield of aromatics, with a BTEX (benzene, toluene ethylbenzene and xylene) overall yield of 60% and a selectivity of 90% of the liquid product. Increasing the Ga loading decreased the BTEX yield due to pore blockage and a decrease in the amount of Brønsted acid sites. The BTEX yield over Ga-promoted zeolites was found to be strongly related to the pore size of the zeolite, whereas its yield over the parent zeolite was not strongly dependent on the pore size. Diffusion of the cracking intermediates was found to have a more significant impact on the aromatization of PP than HDPE. The highest BTEX yield for HDPE was achieved with Ga-promoted HZSM-5, while Ga-promoted hierarchical HZSM-5 exhibited the highest BTEX yield for PP. Furthermore, Ga(1)/Hβ-Redox demonstrated remarkable selectivity (90%) towards ethylene and propylene in the gas phase, surpassing other zeolites (37%-68%).
研究领域:
化学工程
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材料科学
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DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2024
·
IF 9.9
Yang Zhang,Jun Zhao,Lei Zhang,Yong Chen,Wangjing Ma
The recycling and processing of plastic waste to promote resource sustainability has emerged as a global concern. Selectivily upcycling polyolefins into valuable monocyclic aromatic hydrocarbons (MAHs) is a promising strategy to promote a circular economy but limited by low yield and selectivity. In this study, one-step microwave-triggered tandem pyrolysis coupling ZSM-5 catalytic reforming technology was explored, which is efficient for selectively transforming plastic into benzene, toluene, ethylbenzene, and xylene (BTEX) riched oil products. Pyrolysis and catalytic processes were achieved by mixing plastic and ZSM-5 with graphite, respectively, and placing them in the bottom and top layers of the reactor. Results indicate the mass ratio of plastic or ZSM-5 to graphite and microwave irradiation power would influence the selectivity and yield of MAHs. After careful investigation, the optimum reaction conditions are deemed to be 600 W, and the mass ratio of LDPE and ZSM-5 to graphite is 3:1 and 1:1, respectively, and delightful selectivity and yield of MAHs of 82.06% and 28.12 wt% are obtained under the above conditions. More importantly, the BTEX accounted for a significant amount in the MAHs with the selectivity and yield of 70.53% and 24.17 wt%, demonstrating a strong ability to produce high-value BTEX, which is attributed to the ZSM-5 providing a sufficient active site for reforming the pyrolysis vapors and promote the formation of BTEX by cracking, aromatization and Diels-Alder reactions. Additionally, gas products are rich in C 2 H 4 , C 3 H 6 and C 4 H 8 olefin monomers accounting for around 60% of the gas products, which also manifest high value. Besides, the ZSM-5 can be stabilized by exceeding three successive cycles, and this strategy is also suitable for the catalytic upcycling of PP and mixed plastics to produce MAHs selectively. Therefore, this one-step microwave-triggered tandem pyrolysis coupling ZSM-5 catalytic reforming technology provides a potential waste resource utilization method to convert plastic waste into high-value petrochemical products.
研究领域:
化学工程
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环境科学
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材料科学
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产品关联
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
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DOI
高影响因子
ARCHIVES OF MICROBIOLOGY
·
2026
·Vol. 208
·期 5
·235
·
IF 3.4
Zhou Yong,Wu Lei,Rubo Lv,Szpyrka Ewa,Podbielska Magdalena,Amirian Veghar,Russel Mohammad
This study investigated the aerobic biodegradation potential of two novel indigenous bacterial strains, Pseudomonas aeruginosa DUT-Pa and Rhodococcus erythropolis DUT-Re, utilizing benzene, toluene, ethylbenzene, and o-xylene (BTEX) as the sole carbon source. The optimal metabolic activity for both strains was identified at neutral pH (7.0) and mesophilic conditions (30 °C), establishing a critical baseline for enhancing bioremediation protocols. Biochemical oxygen demand (BOD) analysis revealed a direct correlation between the substrate concentration (up to 400 mg/L) and microbial respiratory activity. Dissolved oxygen (DO) depletion from 7.77 mg/L (pre-experiment) to 2.97 mg/L (DUT-Pa) and 2.15 mg/L (DUT-Re) further confirmed the oxygen-dependent degradation. In the gas phase, the highest degradation rate was recorded for benzene, with 98.43, 97.34, and 98.91% by DUT-Pa, DUT-Re, and mixed bacteria, respectively. Meanwhile, the liquid phase demonstrated superior toluene degradation efficiency by DUT-Pa, DUT-Re, and mixed bacteria with 91.99, 83.54, and 93.27% respectively. Bacterial combinations enhanced BTEX degradation, achieving the shortest half-lives and the highest degradation rate constants. Meanwhile, the SOD (325 U/mL) level and MDA (1.5 to 2.59 nmol/g) increased in the mixed system. This study demonstrates that an additive effect of DUT-Pa and DUT-Re combination promotes efficient, complete degradation of BTEX and offers a scalable, eco-friendly solution based on strain-specific cooperative microbial dynamics. Graphical
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PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Tian Yuxuan,Chen Xin,Ding Ning,Liu Hong
The adsorption micelle flocculation (AMF) effect of biosurfactants (rhamnolipids, RL) and polymerized ferric sulfate (PFS) on the removal of low molecular weight benzoic acid (benzoic acid and p -methyl benzoic acid) and phenol (2,4-dichlorophenol and bisphenol A) organics was investigated. The coexistence system of RL and organic matter was constructed, and the effects of pH, Fe concentration, RL concentration and initial concentration of organic matter on the removal effect were discussed. For benzoic acid and p -methyl benzoic acid, the increase of Fe and RL concentrations was beneficial to their removal rates under weak acidic conditions, and the removal rate of the coexistence system was higher for methyl benzoic acid (87.7 %) than for benzoic acid (78.6 %), which might be attributed to the stronger hydrophobicity of the coexistence system for methyl benzoic acid; while for 2,4-dichlorophenol and bisphenol A, pH and Fe concentration changes had less effect on the removal rate, but the increase in RL concentration was favorable to the removal rate, which was 93.1 % and 86.7 % for BPA and 2,4-dichlorophenol, respectively. These findings provide feasible ideas and directions for the removal of organics by AMF using biosurfactants.
研究领域:
环境科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2020
·
IF 8.208
Qiuhao Wu,Yunpu Wang,Yujie Peng,Linyao Ke,Qi Yang,Lin Jiang,Leilei Dai,Yuhuan Liu,Roger Ruan,Donghua Xia,Li Jiang
Microwave-assisted pyrolysis of waste cooking oil is an environmentally friendly and economical method for obtaining benzene, toluene, ethylbenzene, and xylene (BTEX) which are important industrial chemicals. This study provides new routes to produce of BTEX and the utilization of waste cooking oil. The effect of catalytic temperatures (350 °C, 400 °C, 450 °C, 500 °C, and 550 °C), types of metal oxide (CoO, NiO, ZrO 2 , SrO, CeO 2 , and CaO), catalytic modes (ex-situ mixed catalysis, ex-situ separate catalysis, and in-situ separate catalysis), and ratio of HZSM-5 to metal oxide (HZSM-5 only, 4:1, 2:1, 1:1, 1:2, and CaO only) were studied. Results showed high catalytic temperature promoted the formation of monocyclic aromatic hydrocarbons at the cost of a decrease in bio-oil yield. But the concentration of BTEXS (benzene, toluene, ethylbenzene, xylene, and styrene) only increased from 256.58 mg/ml to 259.55 mg/ml with a temperature increase from 500 °C to 550 °C. Alkaline earth metal oxides (CaO, SrO) showed a significant deoxygenation capability during co-catalysis with HZSM-5. However, when CaO was applied under ex-situ mixed catalysis, the concentration of polycyclic aromatic hydrocarbons was up to 35.47%, which was much higher than 9.18% under HZSM-5 only. Also, the concentration of BTEXS decreased from 256.58 mg/ml (HZSM-5 only) to 167.54 mg/ml (HZSM-5 mixed with CaO). Further investigation of catalytic mode showed that ex-situ separate catalysis was more suitable for co-catalysis of alkaline earth metal oxides and HZSM-5. The concentration of BTEXS were both significantly higher than that of HZSM-5 only, which increased by 121.81 mg/ml for CaO and 108.52 mg/ml for SrO under ex-situ separate catalysis. Further study showed that the highest concentration of BTEXS was 702.20 mg/ml obtained when the ratio of HZSM-5 to CaO was 2:1. It was almost 2.8 times higher than HZSM-5 alone and 42.2 times higher than non-catalytic results.
研究领域:
能源与环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 7.7
Li Chen,Ya-Jie Wang,Xiao-Qian Kuang,Yu-Qing Zhang,Tian-Yu Yang,Min Li,Zheng Guo
Benzene, toluene, ethylbenzene, and m-xylene (BTEX) are typical volatile organic compounds (VOCs) that pose serious threats to human health. However, their inherent chemical stability and low reactivity render selective and sensitive detection particularly challenging. Herein, we report a p–n heterostructured gas sensing material comprising hollow Co 3 O 4 nanocubes embedded in porous ZnO nanotubes (Co 3 O 4 /ZnO NTs), fabricated via coaxial electrospinning and Metal-organic frameworks (MOFs)-derived pyrolysis. The engineered architecture combines the large surface area and porosity of ZnO nanotubes with the abundant active sites of Co 3 O 4 , facilitating efficient gas diffusion and charge transport. The resulting sensors exhibit markedly enhanced responses to BTEX gases, particularly ethylbenzene. At 50 ppm, the responses to benzene, toluene, ethylbenzene, and m-xylene are 2.3, 12.2, 46.5, and 30.9 times higher, respectively, than those of pristine ZnO nanotubes. In addition, the sensor demonstrates excellent selectivity for ethylbenzene and stable long-term operation. This work demonstrates an effective strategy for tuning oxide heterojunctions toward high-sensitivity, selective detection of aromatic VOCs, offering practical value for environmental monitoring.
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高影响因子
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