INTERNATIONAL BIODETERIORATION & BIODEGRADATION
·
2018
·
IF 3.562
Juping You,Mine Du,Han Chen,Xinying Zhang,Shihan Zhang,Jianmeng Chen,Zhuowei Cheng,Dongzhi Chen,Jiexu Ye
A new isolate identified as Rhodococcus sp. ZJUT312 via taxonomic and 16S rRNA analysis was used for the efficient degradation of benzene, toluene, ethylbenzene, and xylene (BTEX). The strain ZJUT312 was able to degrade all the BTEX. Their average biodegradation rates followed the order o -xylene > ethylbenzene > toluene > benzene > m -xylene > p -xylene. The degradation rate of o -xylene reached as high as 0.117 mmol L −1 h −1 , which was one to two orders of magnitude higher than that of all other reported o -xylene degrading bacteria. GC-MS analysis revealed that o -xylene degradation pathway mainly proceeded with 2-methylbenzylalcohol as an intermediate and CO 2 as a final product. Mass balance analysis of the carbon element indicated that approximately 59% the o -xylene carbons were transferred to cell biomass and about 20% were mineralized into CO 2 . Furthermore, the o -xylene degradation kinetics fitted well with Haldane's model. The maximum specific degradation rate (0.953 h −1 ) was approximately 2.25 times higher than the reported data in the literature.
研究领域:
环境生物学
·
微生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2025
·
IF 3.1
Guo Zongning,Zeng Shaohan,Zhang Hui,Zhang Xiaolin,Wang Shouhui,Hu Jiwan,Huang Xuelin,Yang Li,Jiao Zhe
Benzene, toluene ethylbenzene and xylene (BTEX), known for their high toxicity and volatility, are key targets for air quality monitoring. Fluorescent probes based on the luminescence intensity of one transition is not efficient for probing BTEX. In this work, we have synthesized a luminescent RhB@MOF sensor array to realize the probing of different BETX by excellent fingerprint correlation between the BTEX and emission peak-height ratio of ligand to dye moieties. Three kinds of RhB@MOF were synthesized simultaneously by varying concentrations of Rhodamine B (RhB) in the solvothermal reaction of (E)-4-(2-carboxyvinyl)benzoic acid (H 2 L) and Cd(NO 3 ) 2 ·4H 2 O (RhB@MOF1, RhB@MOF2, RhB@MOF3). These sensors exhibited two characteristic emission peaks at 430 nm for the host CdMOF and 570 nm for guest RhB, and the emission peak height ratio I 430 /I 570 were constant for each RhB@MOF. Upon reaction with BTEX, due to gap-gap reaction between ligand and different BETX as well as the different swelling effect of BTEX on RhB, the two emission peaks height ratio of three kinds of RhB@MOF showed specific change to different BTEX. The sensor array exhibited a unique pattern of fluorescence variations of BTEX. Principal component analysis (PCA) was applied and achieved complete separation of BTEX. Linear discriminant analysis (LDA) was then applied to discriminate between individual, binary, ternary, and quaternary mixtures of BTEX, resulting in a 100% accuracy rate. Further study also indicated that concentration gradients did not affect the clustering outcomes of BTEX. Compared to traditional methods, the developed fluorescent sensor array offered a more efficient and economical strategy for the identification of BTEX.
研究领域:
化学传感
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环境监测
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Jing Su,Tan Li,Guanqun Luo,Yi Zhang,Evgeny R. Naranov,Kaige Wang
Co-pyrolysis of plastics and biomass is expected to replace traditional petroleum processing to produce BTEX (benzene, toluene, ethylbenzene , and xylenes) on a large scale, which are important chemical raw materials. The introduction of bimetallic catalysts and hydrogen in co-pyrolysis systems is an effective strategy to increase the content of aromatic hydrocarbons in pyrolysis oils, which has not been studied so far. The present study investigated the efficacy of bimetallic catalysts in enhancing aromatization and Diels-Alder reactions in comparison to Mo/ZSM-5. The synergistic interaction between bimetals contributed to the improved selectivity of aromatic hydrocarbons, particularly BTEX. Results revealed that NiMo/ZSM-5 catalysts led to higher aromatics selectivity in liquid oil, whereas FeMo/ZSM-5 resulted in higher BTEX selectivity in aromatic hydrocarbons. Moreover, metal oxide-supported bimetallic catalysts exhibited lower selectivity for aromatic hydrocarbons in liquid oil, despite facilitating higher liquid-oil yield. Among the metal oxide-supported bimetallic catalysts, FeMo/TiO 2 demonstrated the highest selectivity (56%) for aromatic hydrocarbons in liquid oils. The introduction of hydrogen resulted in 100% selectivity of BTEX in aromatic hydrocarbons, thus highlighting the significance of hydrogenation in enhancing the selectivity of BTEX. Combined with the experimental results and literature, a possible reaction mechanism was also proposed.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Li-Hui Chen,Xing-Yi Chen,Shuang Song,Shui-Feng Zhang,Yong-Gang Zhao,Yin Lu
Magnetic polymer microspheres have been extensively utilized as separable and highly efficient adsorbents in wastewater treatment. In this study, a series of novel magnetic spongy porous carbon skeleton materials (Mag-SPCS) have been designed and synthesized by acetonitrile suspension precipitation polymerization, which combines the advantages of the acetonitrile precipitation method and the suspension polymerization method. It was demonstrated that the transformation of the material morphology from microspheres to a porous sponge was achieved by a gradual decrease in the usage amount of ethylene glycol. After N,N-dimethyloctadecylamine (C18) was grafted onto the Mag-SPCS materials, the C18-Mag-SPCS materials with a superhigh saturation adsorption capacity and superfast adsorption efficiency were used for the removal of BTEX (toluene, benzene, and para-xylene) in wastewater. Subsequently, the adsorption properties of the composites with different morphologies were evaluated, and the effect of the usage amount of C18 on the adsorption properties of the C18-Mag-SPCS was further investigated. The maximum adsorption capacities of C18-Mag-SPCS for benzene, toluene, and para-xylene were 714.84, 564.32, and 394.48 mg/g, respectively. The adsorption process was conducted in accordance with the proposed secondary and Langmuir models. Finally, the FTIR, XPS, and XRD characterization results before and after adsorption demonstrated that the adsorption mechanism of toluene onto C18-Mag-SPCS was primarily hydrogen bonding, π–π stacking, and van der Waals forces. These findings of the study indicate that the composite material exhibits an ultrahigh saturation adsorption capacity and ultrafast adsorption efficiency, thereby confirming its considerable potential for application in wastewater treatment.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Jie Ma,Yongqi Yang,Xianchenghao Jiang,Zhuoting Xie,Xiaoxuan Li,Changzhao Chen,Hongkun Chen
The present study investigated the impacts of water matrix constituents (CO 3 2− , HCO 3 − , Cl − , Br − , PO 4 3− , HPO 4 2− , H 2 PO 4 − , NO 3 − , SO 4 2− and natural organic matters (NOM) on the oxidation of a mixture of benzene, toluene, ethylbenzene, and xylenes (BTEX) by thermally activated persulfate (PS). In the absence of matrix constituents, the BTEX oxidation rates decreased in the following order: xylenes > toluene ≈ ethylbenzene > benzene. HCO 3 − /CO 3 2− and NOM inhibited the BTEX oxidation and the inhibiting effects became more pronounced as the HCO 3 − /CO 3 2− /NOM concentration increased. SO 4 2− , NO 3 − , PO 4 3− and H 2 PO 4 − did not affect the BTEX oxidation while HPO 4 2− slightly inhibited the reaction. The impacts of Cl − and Br − were complex. Cl − inhibited the benzene oxidation while 100 mM and 500 mM of Cl − promoted the oxidation of m-xylene and p-xylene. Br − completely suppressed the benzene oxidation while 500 mM of Br − strongly promoted the oxidation of xylenes. Detailed explanations on the influence of each matrix constituent were discussed. In addition, various halogenated degradation byproducts were detected in the treatments containing Cl − and Br − . Overall, this study indicates that some matrix constituents such as NOM, HCO 3 − , CO 3 2− , H 2 PO 4 − , Cl − and Br − may reduce the BTEX removal efficiency of sulfate radical-based advanced oxidation process (SR-AOP) and the presence of Cl − and Br − may even lead to the formation of toxic halogenated byproducts.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yang Wang,Lina Zhou,Hui Li,Hailong Zhu,Teng Zhang,Menglun Yin,Qiuyue Xiang,Chen Hou
The photocatalytic (PC) degradation process of volatile organic compounds (VOCs) has been consistently restricted by the rapid recombination of photogenerated electrons and holes. To solve this problem, in this study, a novel photoelectrocatalytic (PEC) coupled system was constructed by integrating a single-chamber direct glucose fuel cell (SDGFC), which is capable of self-generating electricity, into the conventional PC system. The coupling system can inhibit the recombination of photogenerated electrons and holes by continuously generating a current without an applied power source. In addition, nitrogen-doped carbon quantum dots (N-CQDs) were prepared using biomass gelatin. This was employed as a PC material for the catalytic layer of the air cathode in the above coupling system, and the efficient degradation of benzene series (BTEX) was made easy by regulating the content of the N element. Notably, the N-CQDs under the optimal regulation ratio showed excellent optical properties and degradation performance, achieving an impressive PEC degradation rate of over 80 % for BTEX within 180 min. High-performance N-CQDs complement the novel PEC coupling system of self-generating electricity and provide robust support for BTEX degradation.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Xiwen Liu,Qingkun Hu,Yuanjun Tong,Nan Li,Sai Ouyang,Huangsheng Yang,Jianqiao Xu,Gangfeng Ouyang
Solid-phase extraction (SPE) is a popular technique for environmental sample pretreatment . However, SPE usually requires complex sample pretreatment processes, which is time-consuming and inconvenient for real-time and on-site monitoring. Herein, a solvent-free, rapid, and user-friendly SPE device was developed by coating the polydimethylsiloxane (PDMS)/divinylbenzene (DVB) sorbent on the inner wall of a sample bottle. The extraction process and desorption process were both carried out in the bottle. The analytes trapped in the sorbent were thermally desorbed and simultaneously sucked out from the bottle by an air sampling tube equipped on field-portable GC-MS. Different to previous work, the sample pretreatment process didn’t require any complicated and time-consuming steps, such as centrifugation or filtration. The total analysis time for each sample was less than 25 min, which was feasible for rapid on-site detection, and thus avoided the losses and contamination of samples in conventional sample storage and transportation processes. Under optimal conditions, the proposed SPE method exhibited wide linear ranges, low detection limits (0.010–0.036 μg L −1 , which were much lower than the maximum levels restricted by the US Environmental Protection Agency and the Chinese GB3838-2002 standard), good intra-bottle repeatability (6.13–7.17%, n = 3) and satisfactory inter-bottle reproducibility (4.73–6.47%, n = 3). Finally, the method was successfully applied to the rapid detection of BTEX in the field. The recoveries of BTEX in spiked water samples ranged from 89.1% to 116.2%. This work presents a novel SPE approach for rapid on-site monitoring in water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yifan Li,Tianliang Hu,Run Chen,Rong Xiang,Qiang Wang,Yongfei Zeng,Chiyang He
A novel thiol-functionalized covalent organic framework (COF-S-SH) was prepared as an adsorbent for the simultaneous removal of BTEX (benzene, toluene, ethyl benzene and xylenes) and Hg(II) ion from water. The COF-S-SH was obtained via a Schiff-base reaction between a new triamino-monomer (TABPB) and 2,5-divinylterephthalaldehyde, followed by the thiol-ene “click” reaction between 1,2-ethanedithiol and the vinyl groups. The COF-S-SH was characterized by FT-IR spectrum, energy-dispersive X-ray spectrum, 13 C MAS NMR spectrum, nitrogen adsorption–desorption isotherms, thermo-gravimetric analysis, scanning electron microscope, X-ray diffraction, and zeta potential. The new adsorbent showed high binding ability with the maximum adsorption capacities ( Q max ) of 150.2–255.8 mg/g for BTEX and 588.2 mg/g for Hg(II). The adsorbent also presented fast adsorption kinetics with rate constants of 0.01043–0.05002 g/mg/min for BTEX and 7.254 × 10 −4 g/mg/min for Hg(II). Moreover, the adsorbent had good binding selectivity for Hg(II) against common metal ions in water. The adsorbent also showed good simultaneous uptake ability and good reusability for BTEX and Hg(II), and it has been applied to simultaneously removing BTEX and Hg(II) in the simulated sewage with the removal efficiencies of 63.6, 82.1, 94.6, 95.3 and 94.1% for benzene, toluene, ethyl benzene, m-xylene and Hg(II), respectively. Especially, it can reduce the low-concentration Hg(II) in the simulated sewage to a level lower than the drinking water limit. Therefore, COF-S-SH can be used as an excellent adsorbent material for simultaneously removing BTEX and Hg(II) in from the produced water and wastewater in petroleum chemistry industries.
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 ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Jiaxing Song,Jun Wang,Yuhan Pan,Xudong Du,Jingyuan Sima,Chenxi Zhu,Fangfang Lou,Qunxing Huang
The increasing demand for plastics has resulted in significant plastic waste accumulation and environmental pollution . Catalytic pyrolysis is an attractive treatment method to mitigate the plastic waste management problems and recover high-value oil products. In our study, waste polyethylene (PE) was pyrolyzed to produce benzene, toluene, ethylbenzene and xylene (BTEX)-enriched oil a using dielectric barrier discharge plasma catalytic pyrolysis reactor. Ga-modified Hydro-Zeolite Socony Mobile-Five (HZSM-5) was used as a pyrolysis catalyst. The effects of the PE to Ga/HZSM-5 ratio and discharge power on BTEX enhancement and carbon deposition are discussed. The greatest BTEX selectivity (77.04%) and relatively low coke yield (1.37%) were achieved when the PE/(Ga/HZSM-5) ratio was 2:1 with a non-thermal plasma (NTP) discharge power of 20 W. The regeneration effects of conventional thermal oxidation and NTP on the zeolite catalyst were compared. NTP regeneration at a low temperature (150 °C) achieved the same coke removal rate as that of thermal regeneration at high temperatures (500 °C). Ga/HZSM-5 subjected to NTP regeneration showed higher activity for BTEX formation (BTEX selectivity was 42.10%) as compared to that shown by Ga/HZSM-5 subjected to thermal regeneration (BTEX selectivity was 40.59%). The NTP synergistic catalytic pyrolysis of plastics over Ga/HZSM-5 was found to be a promising strategy for mitigating the plastic waste management problems and upgrading the quality of oil products.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
WATER ENVIRONMENT RESEARCH
·
2021
·Vol. 93
·期 12
·3023-3036
·
IF 1.946
Xuecheng Sun,Shuguang Lyu
l -cysteine-modified Fe 3 O 4 nanoparticles ( l -cys@nFe 3 O 4 ) were synthesized successfully and used as catalyst to activate persulfate (PS) for benzene, toluene, ethylbenzene, and xylenes (BTEX) degradation. The composite was fully characterized, and the l -cys@nFe 3 O 4 had more protrusions and l -cys was combined on the surface of nFe 3 O 4 . The removals of BTEX were 78.2%, 85.1%, 85.3%, 81.2%, respectively, in PS/ l -cys@nFe 3 O 4 system, while only 52.7% 57.8%, 60.8%, and 56.3% of BTEX removals reached under the same condition for nFe 3 O 4 chelated with l -cys in 48 h. Four successive cycles of BTEX degradation were completed in PS/ l -cys@nFe 3 O 4 system. The synergistic mechanisms of BTEX degradation in PS/ l -cys@nFe 3 O 4 system were investigated by electron paramagnetic resonance (EPR), benzoic acid (BA) probe and X-ray photoelectron spectroscopy (XPS) tests. S Fe bond in l -cys-Fe complexes promoted the electron transfer between nFe 3 O 4 core and the solution, iron and iron at the interface, thereby promoting the Fe 3+ /Fe 2+ cycle and the catalytic capacity of nFe 3 O 4 . The optimal pH of PS/ l -cys@nFe 3 O 4 system was 3, while HCO 3 − and Cl − exhibited negative influences on BTEX degradation. Only 14.2%, 15.5%, 15.9%, and 15.6% BTEX had been removed in the presence of 0.12-M PS and 8.0 g/L l -cys@nFe 3 O 4 under the actual groundwater condition. However, expanding the dosage of PS and l -cys@nFe 3 O 4 was an effective strategy to overcome the adverse effect. Practitioner Points L-cys@nFe 3 O 4 were synthesized successfully and used as catalyst to activate PS for BTEX degradation. Four successive cycles of BTEX degradation were completed in PS/L-cys@nFe 3 O 4 system. lS―Fe bond in L-cys@nFe 3 O 4 promoted the electron transfer between PS and nFe 3 O 4 core.
研究领域:
环境科学
·
催化材料
·
污染治理
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产品关联
DOI
PubMed
高影响因子
WATER ENVIRONMENT RESEARCH
·
2019
·Vol. 92
·期 4
·622-630
·
IF 1.24
Xuecheng Sun,Yong Sun,Shuguang Lyu,Zhaofu Qiu,Qian Sui
In this study, nano-CaO 2 (nCaO 2 ) was successfully synthesized and constituted the nCaO 2 /Fe(II) system applying to remediate BTEX, which are typical mixed pollutants in contaminated groundwater. The particle size of the synthesized nCaO 2 was 108.91 nm, and it displayed better BTEX remediation performance than that of commercial CaO 2 . The innovative generation pattern of hydroxyl radicals ( ) in the nCaO 2 /Fe(II) system has been investigated using benzoic acid as the probe, and the proper molar ratio of nCaO 2 /Fe(II) was optimized as 1/1. Over 90% of BTEX was removed in 180 min with the nCaO 2 /Fe(II)/BTEX molar ratio of 40/40/1. Further experiments evaluated the influence of co-existence of mixed pollutants chlorinated hydrocarbon compounds (CHCs) or surfactant constituents on BTEX remediation performance. The experimental results suggested that CHCs have limited influence on BTEX removal rate and surfactants have negative effects on BTEX remediation performance in the experimental conditions. In conclusion, the findings in this study could give some inspirations to apply the nCaO 2 /Fe(II) process in remediating co-existing pollutants in contaminated groundwater. Practitioner points nCaO 2 /Fe(II) system applied to remediate mixed contaminants. generation pattern of the nCaO 2 /Fe(II) system has been investigated. The influence of chloride hydrocarbon compounds have been studied. The effects of surfactants were evaluated.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 8
·5041-5052
·
IF 3.553
Hu Leqi,Jia Fuchao,Wang Shuo,Shao Xingyan,Wang Xiaomei,Sun Yuping,Yin GuangChao,Zhou Tong,Rajan Ramachandran,Feng Zhenyu,Liu Bo
In the present study, the nano-composite of Co-doped g-C 3 N 4 and ZnO (Co–C 3 N 4 /ZnO) sensor was successfully prepared by using solid-phase precursor synthesis method. The crystalline phases were analyzed by X-ray diffraction (XRD), the microstructure of Co–C 3 N 4 /ZnO sensor was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the chemical bonding states were analyzed by X-ray photoelectron spectroscopy (XPS). The gas sensing performance of Co–C 3 N 4 /ZnO sensor was systematically studied and compared with other sensors at the operating temperature of 200–370 °C, and the highest response was observed at 370 °C. Interestingly, Co–C 3 N 4 /ZnO sensor exhibited better response to o-xylene, m-xylene and p-xylene compared with other BTEX gases tested in this study; especially about 11 times higher response was observed against p-xylene compared with pure ZnO sensor at 370 °C. In addition, this sensor showed good stability and repeatability even after 14 weeks with a response/recovery time of 2 s/2 s. The improved gas sensing performance of this sensor was attributed to the formation of more active sites and more number of active oxygen species on the surface of ZnO. Based on these results, it could be ideal to explore Co–C 3 N 4 /ZnO sensor for the rapid detection of BTEX gases, specifically for p-xylene, in the surrounding environment.
研究领域:
材料科学
·
环境科学
·
化学
✓ 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）