APPLIED SURFACE SCIENCE
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2016
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IF 3.15
Jie Su,Weiyuan Yao,Yue Liu,Zhongbiao Wu
A series of HZSM-5 supported CrO x catalysts at different loadings were prepared by wet impregnation method for catalytic combustion of dichloromethane (DCM) in this paper. The catalytic activity tests indicated that both DCM conversion and product selectivity varied greatly with Cr doping contents. The sample at 2 wt% loading showed the highest DCM conversion, while the selectivity toward CO/CO 2 increased at an elevated CrO x loading. The characterization results revealed that the surface acidity and the chemical states of Cr were strongly affected by the doping content. The surface acidity would decline at an elevated Cr loading owing to the interactions between surface OH groups and chromium ions. And higher surface Cr(VI)/Cr(III) ratios could be observed on the catalysts at lower CrO x doping, leading to the improvement of reducibility. The activity and selectivity of DCM catalytic degradation were found to be highly depended on the balance of surface acidity and redox property. The increased surface acidity could result in the enhancement of dissociated adsorption of DCM, which are beneficial to the catalytic activity. However, higher surface acidity meant lower Cr loading, which might lead the adsorbed intermediates incompletely oxidized and the decrease in CO x selectivity due to the limit redox ability.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2015
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IF 2.729
Xiaolan Zeng,Xuesheng Zhang,Li Qin,Zunyao Wang
The tissue distribution, excretion, and metabolic pathway of 2,2′,4,4′,5-penta-chlorinated diphenylsulfide (CDPS-99) in ICR mice were investigated after oral perfusion at 10 mg/kg body weight (b.w.). Biological samples were extracted and separated and, for the first time, were determined by a novel, sensitive, and specific GC–MS method under the full scan and selected ion monitoring (SIM) modes. The results showed that the concentrations of CDPS-99 in the liver, kidneys, and serum reached a maximum after a one-day exposure and that the CDPS-99 concentration in the liver was the highest (3.43 μg/g). The increase in the concentration of CDPS-99 in muscle, skin, and adipose tissue was slower, and the concentrations of CDPS-99 achieved their highest levels after 3 days of exposure. It was observed that the CDPS-99 concentration in adipose tissue was still very high (0.71 μg/g) after 21 days of exposure, which suggested that CDPS-99 was able to accumulate in adipose tissue. In addition, mouse feces accounted for approximately 75% of the total gavage dose, indicating that CDPS-99 was mainly excreted via mouse feces. Metabolism analysis demonstrated that there were three possible metabolic pathways of CDPS-99 in mice: dechlorination reactions with the formation of tetra-CDPS and hydroxylation and oxidation reactions with the formation of OH-CDPS-99 and chlorinated diphenylsulfone. The present study will help to develop a better understanding of mammalian metabolism of CDPS-99.
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Energy Technology
·
2015
·Vol. 4
·期 5
·600-609
·
IF 2.824
Yating Shen,Yunlei Zhang,Yao Chen,Yongsheng Yan,Jianming Pan,Meng Liu,Weidong Shi
Stable oil-in-water high internal phase emulsions (HIPEs) with an internal phase volume fraction of 85 % were stabilized using Tween 85. The prepared poly(HIPEs) were first investigated as adsorbents to treat water polluted with Cr III , and then the catalysts with Lewis acidic sites was synthesized. The catalysts with Brønsted acidic sites were obtained by ion-exchanging. The as-prepared HIPEs–Cr III (PEs–Cr III ) and HIPEs–SO 3 H (PEs–SO 3 H) possess open-cell structure, interconnecting pores, and strong acidity, they are utilized as highly efficient catalysts for the conversion of biomass to 5-hydroxymethylfurfural (HMF). These results showed maximum production yields for cellulose, glucose, and fructose of 37.0 %, 58.0 %, and 80.8 %, respectively. PEs–Cr III and PEs–SO 3 H can be very easily recycled at least four times without significant loss of activity. Herein, a new method is presented to transform cellulose by using two catalysts in a one-pot process for meeting the varying demands involved at different reaction stages.
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Biomass Conversion and Biorefinery
·
2025
·
IF 4.1
Cui Yong,Wang Wenliang,Xu Xiaolu,Miao Hui,Fu Yishuai
In order to increase the yield of high-value components in bio-oil from waste wood-based panels (WWPs), a composite catalyst of SiC@HZSM-5 with both excellent capacities of microwave absorption and catalytic conversion was successfully prepared and applied to the microwave-assisted pyrolysis (MAP) with microwave power of 1000 W (2.45 GHz). The effects of different Si/Al ratios of HZSM-5 on the characterization of catalysts and selective pyrolysis products also have been investigated. The results showed that the obtained SiC@HZSM-5 catalyst exhibited a stable composite structure, favorable dielectric loss characteristics, and high thermal conductivity. Compared with the non-catalytic experiment, SiC@HZSM-5 catalysts significantly enhanced the relative content of nitrogen-containing compounds and reduced the concentration of oxygen-containing compounds in bio-oil, though there was one slight negative impact on bio-oil yield. Importantly, with the increase in Si/Al ratio from 30 to 90, the production of nitrogen-containing compounds was found to decrease from 37.11 to 23.14%, due to the reduction of acidic sites in catalysts. It was noteworthy that during the pyrolysis of WWPs by microwave heating, the catalyst with the Si/Al ratio of 30 significantly promoted the interactions between lignocellulosic components and adhesives and improved the selectivity of amide-N compounds (14.06%, acetamide being the main products) and heterocyclic-N compounds (23.05%, pyrroles, pyridines, and pyrazines constituted the major composition). This work could offer a promising technical reference to thermally converted WWPs to high value-added chemicals by microwave-assisted catalytic pyrolysis (MACP).
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EUROPEAN JOURNAL OF SOIL SCIENCE
·
2024
·Vol. 75
·期 2
·e13464
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IF 4
Yating Deng,Yun Zhang,Xinxin Zheng,Xiaoyang Cui
Forest fires are a primary driver of biogeochemical processes in ecosystems and affect the soil nutrient balance by altering the distribution of organic matter and associated nutrients as well as the composition and availability of elemental nutrients. We investigated the changes in soils’ phosphorus (P) fractions and the adsorption characteristics of potassium dihydrogen orthophosphate (orthoP) and myo -inositol hexakisphosphate (IHP) at two depths (0–5 and 5–10 cm) in soils from two sites differing in fire severity: long-unburned and heavily burned. Five years after the fire, there were increases in the total P and extractable inorganic P (H 2 O-P, NaHCO 3 -Pi, NaOH-Pi, D.HCl-Pi and C.HCl-Pi) contents. Conversely, there was a decrease in organic P (NaHCO 3 -Po, NaOH-Po and C.HCl-Po). The adsorption of soil for orthoP at a depth of 0–5 cm was dependent on the amount of P supplied by the soil; at low concentrations, heavily burned soil showed a lower adsorption than long-unburned soil. However, at high concentrations, the adsorption of heavily burned soil was significantly larger than that of long-unburned soil. With respect to IHP, the adsorption of long-unburned soil was also more significant at depths of 0–5 cm. The adsorption of both orthoP and IHP of heavily burned soil was significantly higher than that of long-unburned soil at a depth of 5–10 cm. Fire also decreased the binding degree (k 1 ) of soil-P and the solid phase at depths of 0–5 and 5–10 cm. The increase in P adsorption capacity outweighed the addition of P from ash, resulting in less leaching in heavily burned areas and minimizing P loss. Overall, forest fires significantly affect the adsorption characteristics and P fractions of soil, specifically orthoP and IHP, during the initial stage of postfire recovery. These effects are closely related to the direct influences of iron oxide, soil organic matter and aluminium oxide in the soil and may even produce relatively long-term effects on the P recycling process of the entire ecosystem.
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Bioresources and Bioprocessing
·
2025
·Vol. 12
·期 1
·1-14
·
IF 5.1
Ai Yulin,Huang Yusong,Zhao Hongru,Su Bingmei,Lin Juan
5-Hydroxytryptophan (5-HTP) is widely used as a natural remedy for sleep disorders. In terms of biosafety, bio-derived 5-HTP is preferred over chemically synthesized 5-HTP. However, the low titer of 5-HTP in the reported microbiological methods (< 10 g/L) limits the industrialization of 5-HTP biosynthesis. In the present study, a Trp-accumulating E. coli strain TRP1 was constructed by blocking the degradation path (Δ tnaA ), branching paths (Δ pheA , Δ tyrA ) and repression system (Δ trpR , Δ trpL ). Next, the hydroxylation module employing a phenylalanine hydroxylase mutant XcPAH W179F (XC2) coupled with an MH4 regenerating system (CvPCD-EcFolM system) was screened to convert L-Trp into 5-HTP. Protein engineering was performed on hydroxylase XC2 based on the molecular dynamics simulation of the enzyme-substrate complex, and the strain TRP1-XC4 harboring the triple-mutant XcPAH L98I/A129K/W179F (XC4) was able to produce 319.4 mg/L 5-HTP. Genome editing was carried out focused on accelerating product efflux (strengthening YddG) and increasing MH4 supply (strengthening FolM, FolE and FolX), resulting in a strain TRP5-XC4 to produce 13.9 g/L 5-HTP in 5 L fed-batch fermentation with a space-time yield of 0.29 g/L/h, which is the highest production and productivity record for 5-HTP biosynthesis. This study successfully provided an engineered strain and an efficient green method for the industrial synthesis of 5-HTP. Graphical
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Yujian Liang,Zhihong Tu,Qi Wu,Xuezhen Zhang,Xiaomei Tan,Xuan Guan,Jinlan Zhao
To address the significant wastewater discharge from the printing and dyeing industry today, this study employed pyrite-activated persulfate (PS/pyrite) to induce advanced oxidation for the degradation of a representative azo dye, Reactive Black 5 (RB5), and conducted a comprehensive analysis of pertinent influencing factors. Leveraging pyrite's pH self-regulation capabilities, the pyrite/PS system demonstrated robust RB5 degradation across a broad pH spectrum of 3–9, achieving a degradation rate of approximately 96 %. Interestingly, due to the photocatalytic properties of pyrite, the degradation efficiency can be enhanced by 21 % with pyrite under illumination. Subsequently, the degradation of RB5 under illumination is further enhanced in PS/pyrite system, ultimately achieving a degradation rate of almost 100 %. The system maintained an acidic milieu and sustained the release of Fe 2+ , thereby fostering an optimal Fe 2+ /Fe 3+ cycle. In a simulated wastewater environment, the pyrite/PS system exhibited resilience against interference from NH 4 + , NO 3 − , and humic acid (HA), while exhibiting a synergistic catalytic effect with Fe 2+ and enhancing Fe 2+ /Fe 3+ cycling at elevated Cu 2+ concentrations. Electron paramagnetic resonance (EPR) tests and quenching experiments confirmed the generation of both hydroxyl radicals ( OH) and sulfate radicals (SO 4 − ), with SO 4 − serving as the primary radical species. Scanning electron microscopy (SEM) analysis identified rough microparticles as the primary sites for Fe 2+ release and reactivity. UV-spectrophotometry and visual assessment of pollutant discoloration indicated successful disruption of RB5's chromophore ( N N ) structure and naphthalene ring, achieving effective removal. The findings of this research offer valuable insights for the practical application of pyrite/PS systems in the treatment of printing and dyeing wastewaters.
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Journal of Energy Chemistry
·
2024
·
IF 14
Peiyun Zhou,Haokun Pan,Guangtong Hai,Xiang Liu,Xiubing Huang,Ge Wang
In this work, nickel foam supported CeO 2 -modified CoBDC (BDC stands for terephthalic acid linker) metal-organic frameworks (NF/CoBDC@CeO 2 ) are prepared by hydrothermal and subsequent impregnation methods, which can be further transformed to NF/CoOOH@CeO 2 by reconstruction during the electrocatalytic test. The obtained NF/CoOOH@CeO 2 exhibits excellent performance in electrocatalytic oxidation of 5-hydroxymethylfurfural (HMF) because the introduction of CeO 2 can optimize the electronic structure of the heterointerface and accelerate the accumulation of *OH. It requires only a potential of 1.290 V RHE to provide a current density of 50 mA cm −2 in 1.0 M KOH + 50 mM HMF, which is 222 mV lower than that required in 1.0 M KOH (1.512 V RHE ). In addition, density-functional theory calculation results demonstrate that CeO 2 biases the electrons to the CoOOH side at the heterointerface and promotes the adsorption of *OH and *HMF on the catalyst surface, which lower the reaction energy barrier and facilitate the electrocatalytic oxidation process.
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FUEL
·
2024
·
IF 6.7
Weizhen Xie,Yue Tang,Yiqiang Liu,Mengyuan Huang,Lu Lin,Xing Tang
In this study, Zr-based coordination polymers were synthesized via solvothermal method for the Meerwein-Ponndorf-Verley reduction of biomass-derived aldehydes and ketones. The morphology and strength of Lewis acid sites could be tuned by using different solvent during catalyst preparation. A 98.5 % yield of 2,5-bis(hydroxymethyl)furan (BHMF) was achieved at 100 °C using Zr-PDC/DMF-DCB, which was synthesized with pyridine-2,6-dicarboxylic acid (PDC) as ligand in a mixed solvent of N, N-dimethylformamide (DMF) and 1,2-dichlorobenzeneisopropanol (DCB) and exhibited moderate Lewis acid sites. Conversely, while Zr-PDC synthesized in alcohols (Zr-PDC/MeOH and Zr-PDC/EtOH) were used as catalysts, etherification products formed instead of BHMF. Further investigation into the role of solvents during catalyst preparation revealed that coordination between Zr sites and DMF increased the electron cloud density of Zr sites, thus weakening Lewis acidity. In addition, the inclusion of hydrophobic DCB resulted in the formation of spherical morphology, which improved resistance to carbon deposition and enhanced anti-agglomeration properties. This work presents a strategy for controlling acid strength and improving catalytic stability of coordination polymers.
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MOLECULAR NEUROBIOLOGY
·
2025
·
IF 4.3
Yan Qian,Li Xiao-Jun,Wang Qi-Qi,Jia Wei,Wang Shu-Ling
Approaches of promoting a neural milieu permissive for plasticity and resilience against neuronal injury are important strategies for the treatment of a range of neurological disorders. Fibroblast growth factor 21 (FGF21) which is known for its role as a potent regulator of glucose and energy metabolism has also proved to be neuroprotective against various mental diseases. However, the underlying molecular mechanisms remain elusive. Here, we report a study of the neuroprotective effects of FGF21 by promoting 5-HT 1A R-FGFR1 heteroreceptor formation and triggering MEK 1/2 -ERK 1/2 signaling pathway in normal or abnormal neurological conditions. First, the in vitro cellular experiments demonstrated that FGF21 exerted a protective effect against glutamate-induced cytotoxicity and promoted cell differentiation and growth. Then, in wild-type and FGF21 −/− mice, exogenous FGF21 promoted FGFR1-5-HT 1A R heteromers formation in the CA3 and dentate gyrus region of the hippocampus and activated MEK 1/2 -ERK 1/2 signaling. Coordinately, FGF21 exerted similar influences in the hippocampi of IBA-induced neurological injury mice or combined stress-exposed mice. Besides, FGF21 treatment activated the phosphorylation of FGFR1 and elevated the expression of synaptophysin in these mice with neurological injury or combined stress exposure. These results illustrated that FGF21 alleviated neurological impairment through FGFR1-5-HT 1A R heteromer and ERK 1/2 signal activation and suggested that the regulation of FGFR1-5-HT 1A R heteromers and MEK 1/2 /ERK 1/2 pathway may play a key role in mediating the neuroprotective effects of FGF21 against various neurodegeneration conditions.
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高影响因子
FUEL
·
2024
·
IF 6.7
Jianfei Luo,Langlang Wang,Yibing Xie,Ping Ning,Yiran Xiong,Hang Zhang,Yixing Ma,Shao Zhang,Xueqian Wang
Existing processes for transforming arsine (AsH 3 ) into toxic arsenic oxides (As x O y ) through catalytic oxidation do not meet economic requirements. In contrast, the catalytic decomposition method stands out due to its ability to both remove AsH 3 and obtain elemental arsenic (As 0 ) as a valuable product. A series of blank molecular sieves (HZSM-5, 13X, MCM-41, and TS-1) was applied to the catalytic decomposition performance of AsH 3 . At a catalytic decomposition temperature of 100 ℃, the HZSM-5 zeolite exhibited exceptional performance, achieving a D 90% value (the duration for which the AsH 3 removal efficiency remained above 90 %) exceeding 40 h. Moreover, up to 83.1 % of the product was As 0 . Comprehensive characterization revealed that the surface of the HZSM-5 zeolite contained a large number of strong acid sites, which played a key role in As 0 generation. In situ diffuse reflectance infrared spectroscopy further revealed the activation behavior of O 2 at the Brønsted acid sites on HZSM-5. To assess its suitability in industrial applications, the AsH 3 removal performance of the HZSM-5 molecular sieve was investigated in the presence of actual gas components (CO, H 2 S, PH 3 ). This study provides new ideas for the effective catalytic decomposition of AsH 3 and the recovery of valuable products in industry.
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JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Longyu Wang,Haibo Jin,Zhichang Liu,Suohe Yang,Guangxiang He,Haiyan Liu,Xianghai Meng,Chunming Xu
The formation mechanism and pathway of HMF from fructose dehydration were investigated using in-line FTIR monitoring and in-situ 13 C NMR in this study. The results of the infrared absorption spectrum obtained at different time intervals during the reaction process showed significant inconsistencies with the acyclic pathway. However, the in-situ NMR analysis revealed the direct observation of two intermediates, fructose furan and (4R-5R)-4-hydroxy-5-hydroxymethyl-4,5-dihydrofuran-2-formaldehyde, providing direct evidence to support the cyclic carbocation pathway. This study also included theoretical analysis of the intermediates involved in the key steps of various reaction pathways using density functional theory (DFT) calculations. The key steps in the cyclic pathway were found to have lower activation energy compared to the acyclic pathway, while exhibiting significant differences in electronegativity at the reaction sites. The computational results not only reveal but also provide support for the rationality of the cyclic formation mechanism. The response surface methodology (RSM) was utilized to optimize the preparation process of HMF through fructose dehydration. It enabled determination of the significance order for each factor (reaction temperature > reaction time > mass percentage of water in the solvent) and identification of the optimal process conditions (reaction time of 3.5 h, reaction temperature of 143.5 °C, mass percentage of water in the solvent of 5.0 %, and maximum yield of 5-HMF reaching 82.4 %).
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