Journal of Cleaner Production
·
2024
·
IF 9.7
Li Zhang,Yi Wei,Yuan Yin,Xiang Liu,Shu Zhang,Lei Shi,Juntao Wei,Hong Zhang,Alexander N. Kozlov,Maxim V. Penzik,Deliang Xu
Nitrogen migration and transformation have been extensively studied during the thermochemical conversion of biomass, particularly N-rich biomass, due to concerns about nitrogen oxides pollution or the preparation of N-doped carbon materials. Nitrogen in fiberboard was extracted into an aqueous solution through low-temperature hydrothermal treatment to prepare the recycled aqueous solution. Subsequently, hydrothermal conversions of glucose and xylose were conducted in the recycled solution. The migration and transformation of nitrogen between hydrochars and aqueous phase were investigated. The results showed that the nitrogen retention rates of glucose hydrochars were higher than those of xylose hydrochars at low temperatures. As the temperature increased, the nitrogen retention rates of glucose and xylose hydrochars tended to converge, reaching their highest value at 220 °C. In hydrochars, nitrogen had a high content and was widely distributed on the surface of the carbon microspheres. The nitrogen content did not change significantly with increasing temperatures, but the nitrogen functional groups tended to become more thermostable. In addition, the char yields of glucose and xylose in fiberboard recycled solution were significantly higher than that in the ultrapure water at low temperatures, which indicates that the introduction of nitrogen promotes the formation of hydrochars. These findings favored the study on the nitrogen migration and transformation during hydrothermal conversions of lignocellulose in a N-rich environment.
研究领域:
能源与环境科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 2
·152
·
IF 2.881
Xin Wang,Qingjun Zhu,Xiangju Liu,Baorong Hou
This work studied the application of phosphoric acid-gallic acid in vinyl chloride acrylic emulsion and its rust conversion performance. The increase of phosphoric acid affected the stability of the system, leading to the rapid precipitation of flocculent precipitation. Rust conversion coating (RCC) showed the best synergistic conversion effect when gallic acid (GA) was 0.2 wt.% and phosphoric acid (PA) was 2 wt.%. XRD and FTIR analysis show that the components of adherent rust (AR) are α-FeOOH, γ-FeOOH and Fe3O4. The conversion products are ferric phosphate (FP) and ferric gallate (FG). The RCC can effectively treat the rusted steel (RS) produced by simulated marine atmospheric corrosion. The corrosion current density was reduced by three orders of magnitude, the adhesion reached 2.75 MPa, and the salt spray corrosion resistance was 20 days. The results of Raman, XPS, SEM and EDS show that the ionic dissolution of iron, complexation and further oxidation reactions occur at the interface between the adherent rust and the RCC. After rust conversion treatment, unreacted rust (UR) affects the further improvement of adhesion strength and anti-corrosion performance.Keywords:rust conversion coating;anticorrosion;gallic acid;acrylic emulsion;rust converter
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2017
·
IF 5.099
Rong-Ni Dou,Jing-Hao Wang,Yuan-Cai Chen,Yong-You Hu
This study systematically explored the effect of humic acid (HA) (as model of natural organic matter) on the kinetics, products and transformation pathway of triclosan (TCS) by laccase-catalyzed oxidation. It was found that TCS could be effectively transformed by laccase-catalysis, with the apparent second-order rate constant being 0.056 U −1 mL min −1 . HA inhibited the removal rate of TCS. HA-induced inhibition was negatively correlated with HA concentration in the range of 0–10 mg L −1 and pH-dependent from 3.5 to 9.5. FT-IR and 13 C NMR spectra showed a decrease of aromatic hydroxyl (phenolic) groups and an increase of aromatic ether groups, indicating the cross-linking of HA via C-O-C and C-N-C bonds during enzyme-catalyzed oxidation. Ten principle oxidative products, including two quinone-like products (2-chlorohydroquinone, 2-chloro-5-(2,4-dichlodichlorophenoxy)-(1,4)benzoquinone), one chlorinated phenol (2,4-dichlorophenol (2,4-DCP)), three dimers, two trimmers and two tetramers, were detected by gas chromatograghy/mass spectrometry (GC-MS) and high performance liquid chromatography/quadrupole time-of-flight/mass spectrometry (HPLC/Q-TOF/MS). The presence of HA induced significantly lesser generation of self-polymers and enhanced cross-coupling between HA and self-polymers via C-O-C, C-N-C and C-C coupling pathways. A plausible transformation pathway was proposed as follows: TCS was initially oxidized to form reactive phenoxyl radicals, which self-coupled to each other subsequently by C-C and C-O pathway, yielding self-polymers. In addition, the scission of ether bond was also observed. The presence of HA can promote scission of ether bond and further oxidation of phenoxyl radicals, forming hydroxylated or quinone-like TCS. This study shed light on the behavior of TCS in natural environment and engineered processes, as well provided a perspective for the water/wastewater treatment using enzyme-catalyzed oxidation techniques.
研究领域:
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 22
·6803
·
IF 4.412
Xuemei Sun,Yifei Leng,Duanji Wan,Fengyi Chang,Yu Huang,Zhu Li,Wen Xiong,Jun Wang
The negative impacts on the ecosystem of antibiotic residues in the environment have become a global concern. However, little is known about the transformation mechanism of antibiotics by manganese peroxidase (MnP) from microorganisms. This work investigated the transformation characteristics, the antibacterial activity of byproducts, and the degradation mechanism of tetracycline (TC) by purified MnP fromPhanerochaete chrysosporium. The results show that nitrogen-limited and high level of Mn2+medium could obtain favorable MnP activity and inhibit the expression of lignin peroxidase byPhanerochaete chrysosporium. The purified MnP could transform 80% tetracycline in 3 h, and the threshold of reaction activator (H2O2) was about 0.045 mmol L−1. After the 3rd cyclic run, the transformation rate was almost identical at the low initial concentration of TC (77.05–88.47%), while it decreased when the initial concentration was higher (49.36–60.00%). The antimicrobial potency of the TC transformation products by MnP decreased throughout reaction time. We identified seven possible degradation products and then proposed a potential TC transformation pathway, which included demethylation, oxidation of the dimethyl amino, decarbonylation, hydroxylation, and oxidative dehydrogenation. These findings provide a novel comprehension of the role of MnP on the fate of antibiotics in nature and may develop a potential technology for tetracycline removal.Keywords:tetracycline;manganese peroxidase;antibacterial potency;transformation products;transformation mechanism
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2021
·Vol. 11
·期 11
·1412
·
IF 2.881
Wenbo Li,Yue Jiang,Dingguo Liu,Jiran Zhu,Yi Xie,Lanlan Liu
We aimed to improve the corrosion resistance of transmission network cabinet equipment in high temperature and humidity environment. In this paper, using acid modified acrylic acid as the main component, the composite conversion agent was obtained by adding phosphoric acid phytic acid and other components. Through the surface morphology, electrochemical test and adhesion force test of rust conversion coating, the versatility and corrosion resistance of rust conversion coating on the substrates were analyzed. Combined with zinc phosphate primer, the effect of rust conversion agent on the adhesion and salt spray corrosion resistance of the commercial primers was studied. The composite conversion agent has good effect on atmospheric corrosion rust layer. The corrosion resistance and adhesion force of the atmospheric corrosion rust layer treated with rust conversion agent were significantly increased. The adhesion of zinc phosphate primer on atmospheric corrosion rust coating with rust conversion was three times higher than that of atmospheric corrosion rust coating without rust conversion, respectively. Composite rust conversion agent has broad versatility, which can be used for rust conversion of atmospheric corrosion rust layer. At the same time, it has a good corrosion resistance, that can obviously improve the corrosion potential of the corroded surface and reduce the corrosion current density. In addition, the composite rust conversion agent can significantly improve the adhesion and corrosion resistance of the primer coating.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Heng Zhang,Feng Cheng,Yan Li,Chao He,Hu Li,Song Yang
Efficiently selective catalytic conversion of biomass into biofuels and high-value chemicals using robust and porous catalysts is of great significance for valorization of renewable carbon resources. With respect to this, to reduce the supply dependence on natural oils, heterogeneous catalysis provides the opportunity for versatile anethole (AN) synthesis from bio-derived 4′-methoxypropiophenone (4-MOPP) via the one-pot cascade reactions of catalytic transfer hydrogenation (CTH) followed by dehydration, using an alcohol hydrogen donor and a Lewis/Brønsted acid catalyst. Herein, a sustainable and green strategy for catalytic upgrading of 4-MOPP to AN was developed via the cascade CTH-dehydration process, which was remarkably promoted by polymeric organophosphate unconventional MOFs-hafnium nanohybrids (PDVP-Hf) prepared via a simple solvothermal method. Interestingly, Brønsted/Lewis acidity, Lewis basicity, and hydrophobicity of PDVP-Hf could be effectively regulated by simply adjusting the composite components, among which PDVP-Hf-3 having an amorphous and porous inorganic-organic framework structure (with mesopores centered at 6.52 nm), an enhanced acidity of a suitable B/L molar ratio with lower basicity, and a strong hydrophobicity (water contact angle of 113°), was demonstrated to be efficient for selective conversion of 4-MOPP to AN with a maximum yield of 98.9% using 2-pentanol as hydrogen donor. Moreover, this developed catalytic system exhibited broad substrate generality, and could be employed for reductive upgrading of various carbonyl compounds to alcohols, or further coupled with dehydration to afford olefins. The catalyst synergistic roles of L acid-base couple sites (Hf 4+ -O 2− ) and B acid species (-OH) contributed to its pronounced performance, while high thermostability and robust hydrophobicity of PDVP-Hf-3 endowed its superior reusability, with no significant decline in reactivity for five consecutive recycles. The involved catalytic mechanisms and reaction pathways were explicitly elucidated by control experiments and theoretical calculations. This work sheds light on the appropriate design of unconventional MOF-polymer nanohybrids by combining both advantages for enhanced biomass upgrading via tough cascade reactions.
研究领域:
化学工程
·
催化科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
NATURAL PRODUCT RESEARCH
·
2022
·
IF 2.488
Xin Liu,Zhihong Cheng
Euphorbia factor L1 (EFL1, 1) is a natural tri-ester of 6,17-epoxylathyrol with cancer multidrug resistance (MDR) reversal activity. Several EFL1 derivatives (2–9) were prepared by chemical and microbial transformations and their ability to inhibit P-glycoprotein (P-gp) activity was estimated. Six de-acylated derivatives (2–7) were obtained through base-hydrolysis of 1, and the base-catalysed hydrolysis via KOH and NaOH yielded different hydrolysed products of 1. Two biotransformed products (8–9) were directly obtained via microbial transformation of 1, and 8 was also formed by microbial conversion of the hydrolysed product 3. The P-gp modulation of 1–9 was assessed by a zebrafish model. The substrate 1 and its biotransformed product 9 as the tri-esters of lathyranes possessed the highest P-gp inhibitory activity with IC50 values of 34.97 and 15.50 µM, respectively, through down-regulating P-gp expression at the protein level rather than at MDR1 mRNA level.
研究领域:
药理学
·
生物化学
·
毒理学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energies
·
2022
·Vol. 15
·期 19
·7221
·
IF 3.252
Mengyao Guo,Shu Yu,Shu Zhang,Juntao Wei,Wenran Gao,Weina Bao,Lei Shi,Hong Zhang,Deliang Xu
In thermal conversion utilization, nitrogen-rich biomass such as waste wood-based panels will release a large amount of NOxinto the atmosphere, causing serious harm to the surroundings. By means of co-pyrolysis, N in waste wood-based panels can be fixed in chars instead of discharging into the atmosphere in the form of volatile matter, which can reduce NOxemission and lay a foundation for the preparation of nitrogen-rich carbon materials with high added value. As the most commonly used adhesive in the production of wood-based panels, urea-formaldehyde resin adhesive (UF) is the main nitrogen source in waste wood-based panels. Therefore, the purpose of this paper is to explore the effects of glucose, ethyl maltol and 2,5-dimethyl-4-hydroxy-3(2H)-furanone (DMHF) on nitrogen migration and conversion during UF pyrolysis by adjusting the different proportions of model compounds and UF. Thermogravimetric analysis showed that ethyl maltol and DMHF had lower thermal stability and the pyrolysis process was concentrated in the range of 90–168 °C, which does not coincide with the mass loss temperature of UF. UF can promote the pyrolysis of these three model compounds at the initial stage to some extent. The elemental analysis showed that the N retention in co-pyrolysis chars increased in varying degrees with the increase of the addition of model compounds; the nitrogen retention in chars of glucose-UF, ethyl maltol-UF and DMHF-UF increased by 28.47%, 3.48% and 16.45% with the increase of the model compound content from 50% to 90%, respectively. The XPS results showed that the relative content of N-6 in chars increased with the increase of ethyl maltol content, and the relative content of N-5 in chars increased with the increased addition of DMHF. Glucose had little effect on the distribution of N-functional groups in chars.Keywords:wood;thermal conversion;model compounds;urea-formaldehyde resin adhesive;char;nitrogen migration and transformation
研究领域:
能源科学
·
生物质能
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2024
·
IF 6.2
Dong Zhao,Hongyu Chen,Shuo Shen,Enyu Lu,Junlong Feng,Hui Zhi,Lei Wang,Wei Li
Flurochloridone (FLC) is a pyrrolidone herbicide used to control broad-leaved weeds in various crop fields. However, there is still a lack of comprehensive research on the environmental fate of the Qinghai-Tibet Plateau (QTP) and the toxicity of its potential transformation products (TPs). In this study, laboratory experiments were conducted to investigate the degradation kinetics, pathways, and toxicity of FLC’s TPs. Nine TPs were identified in soil using Ultra-Performance Liquid Chromatography Quadrupole-Orbitrap Mass Spectrometry (UPLC-Q-Exactive Orbitrap MS) and Compound Discoverer software, employing suspect and nontarget screening strategies. The initial report of two TPs, TP204, and TP191 was confirmed through the acquisition or synthesis of their standards. High Performance Liquid Chromatography coupled with Tandem Mass Spectrometry (HPLC-MS/MS) was subsequently used for further quantification of these TPs in all samples under examination. The primary transformation reactions of FLC in the environment include oxidative dechlorination, reductive dechlorination, reductive defluorination, acetylation, and hydrolysis. Predictive assessments via ECOSAR, alongside empirical laboratory experiments, revealed that most novel TPs exhibit significantly lower acute toxicity towards Danio rerio , Daphnia magna Straus , and Algae compared to FLC. However, TP204 demonstrated neutral chronic toxicity towards Daphnia magna Straus and Green algae , potentially posing a latent threat to aquatic ecosystems. These results are crucial for elucidating the environmental fate of FLC, assessing environmental risks, and guiding scientific and reasonable use. This research holds significant importance for the ecological environment protection in the Tibetan Plateau region.
研究领域:
环境科学
·
毒理学
·
农业科学
✓ 已验证
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Jianhe Tang,Yu Liu,Yitong Lin,Xueke Liu,Liang Chen,Congcong Piao,Dawei Fang,Jun Wang
Photocatalysis technology is an effective way for converting nitrate (NO 3 − ) and sulfite (SO 3 2− ) in wastewater to pollution-free nitrogen (N 2 ) and exploitable ammonium sulfate ((NH 4 ) 2 SO 4 ). In this study, three novel photocatalysts , Z-scheme (Cu,Cu)/g–C 3 N 4 –(Cu,Cu)-WO 3 (002), Z-scheme (Cu,Ag)/g–C 3 N 4 –(Cu,Ag)-WO 3 (002) and Z-scheme (Cu,Ru)/g–C 3 N 4 –(Cu,Ru)-WO 3 (002), were prepared by photo-assisted electrostatic self-assembly method. The prepared photocatalysts are synthetically characterized by XRD , SEM, TEM, EDX , XPS , DRS, PL , TPR and EIS . The effects of different co-catalyst combinations on the activity and selectivity of the photocatalysts are evaluated. Also, the impacts of simulated solar light irradiation time, NO 3 − initial concentration and cycle times on the conversions of NO 3 − and SO 3 2− are studied. The results display that the Z-scheme (Cu,Ag)/g–C 3 N 4 –(Cu,Ag)-WO 3 (002) photocatalyst can selectively convert NO 3 − to N 2 , while the Z-scheme (Cu,Ru)/g–C 3 N 4 –(Cu,Ru)-WO 3 (002) photocatalyst can selectively convert NO 3 − to NH 4 + . Nevertheless, the Z-scheme (Cu,Cu)/g–C 3 N 4 –(Cu,Cu)-WO 3 (002) photocatalyst has hardly selectivity for conversion of NO 3 − . These three photocatalysts all exhibit relatively strong capabilities for converting SO 3 2− to sulfate (SO 4 2− ) due to the existence of the highly active (002) plane of WO 3 . Finally, the possible mechanisms on the photocatalytic conversions of NO 3 − and SO 3 2− caused by Z-scheme (Cu,M)/g–C 3 N 4 –(Cu,M)-WO 3 (002) (M = Cu, Ag and Ru) photocatalysts are proposed.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
TRANSGENIC RESEARCH
·
2025
·Vol. 34
·期 1
·1-17
·
IF 2
Yang Yanhui,Lu Jun,Xue Tianrui,Cao Zhenli,Li Mingjie,Zhang Zhongyi,Wang Rong,Wu Tongyu
The Agrobacterium tumefaciens mediated transformation is the prevailing methodology for plant genetic manipulation; however, A. tumefaciens overgrowth is a common constraint in the process. Exploring auxotrophic A. tumefaciens could reduce overgrowth and enhance plant transformation efficiency. The ILVC gene, which encodes the ketol-acid isomeroreductase, is critical for Valine (Val) and isoleucine (Ile) biosynthesis in some microorganisms. However, its function in A. tumefaciens is unclear. To ascertain the function of ILVC and generate an auxotrophic A. tumefaciens , this study employed an allelic exchange to disrupt the ILVC in A. tumefaciens strain GV3101. This resulted in the loss of ketol-acid isomeroreductase activity and the prevention of Val and Ile biosynthesis, creating a dual-auxotrophic GV3101 ∆ILVC . Transient expression assays in Nicotiana benthamiana transformation demonstrated that the GV3101 ∆ILVC was capable of T-DNA transfer. Moreover, stable genetic transformation analysis in N. benthamiana indicated that the introduction of GV3101 ∆ILVC led to a reduction in overgrowth within infected plant tissues. Additionally, an enhancement in transformation efficiency was observed with the prolongation of the co-cultivation time of the explant-infected strain. This study revealed the function of ILVC and explored a dual-auxotrophic A. tumefaciens for Val and Ile, potentially broadening the utilization of auxotrophic strains in plant genetic transformation.
研究领域:
植物学
·
微生物学
·
遗传学
✓ 已验证
DOI
PubMed
高影响因子
Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 3
·1-16
·
IF 21.8
Wu Jun,Zhao Xinlei,Song Shangzhi,Wang Lei,Guo Yanan,Ding Jing,Mei Danhua,Wan Hui,Guan Guofeng
Efficient plasma-catalysis of CH 4 and CO 2 to value-added oxygenates remains challenging due to limited research on the activation and conversion mechanism of the * CO intermediate. The rational design of catalysts at the atomic level can improve mechanistic understanding. In this study, an atomically dispersed catalyst with diatomic Cu centers anchored on carbon nitride nanosheet is developed. The coordination structure of Cu diatoms with four N atoms and two C atoms provides a new channel for efficient charge transfer and separation, enhancing CH 4 and CO 2 conversion. Additionally, CO-DRIFT and theoretical calculations demonstrate that strong CO adsorption and the stable * CH 3 OH intermediate on Cu diatomic sites promote CH 3 OH generation. This study presents a viable strategy for designing novel diatomic catalyst for CH 4 and CO 2 conversion into value-added products, and expands understanding of the plasma-catalysis mechanism at the atomic level.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 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）