INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Yaohao Zhang,Kaifen Luo,Lijuan Peng,Jiahuan Zhong,Chengkai Zhang,Dingsheng Yuan
Compared to a single heterostructure , constructing multiple heterojunction interfaces to enhance bifunctional catalytic activity still faces challenges. Herein, a nanoflower-like electrocatalyst with multiple heterojunction interfaces, which consists of MoO 3 , V 2 O 5 , and Ni(OH) 2 in-situ grown on nickel foam, is prepared through a one-step hydrothermal method (MoO 3 /V 2 O 5 /Ni(OH) 2 /NF, named MVN/NF). The MVN/NF exhibits superior catalytic performance, attributable to enhanced electron transfer facilitated by numerous heterojunction interfaces, a substantial active specific surface area , and a self-supported architecture. It requires low potentials for hydrogen evolution reaction , urea oxidation reaction , and overall urea electrolysis of 81 mV, 1.351 V, and 1.450 V (vs. RHE), respectively, to reach a current density of 10 mA cm −2 . By cutting the material into a large-scale electrode for use in an alkaline electrolyzer , its Faraday efficiency was 90.0%, and the urea decomposition rate reached 45.1%. This work offers broad application prospects for the realization of large-scale hydrogen production and the decomposition of urea-containing wastewater.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2018
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IF 2.441
Xingchen Zhai,Haitian Zhao,Min Zhang,Xin Yang,Jingming Sun,Yongxin She,Aijun Dong,Hua Zhang,Lei Yao,Jing Wang
A new 3‑aminophenylboronic acid-functionalized stationary phase based on silica for hydrophilic interaction liquid chromatography (HILIC) was developed and showed great HILIC characteristics on separation for chito‑oligosaccharides. The material was synthesized by grafting 3‑aminophenylboronic acid group to silica, and it was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), elemental analysis and thermal gravimetric analysis (TGA). Nucleobases and nucleosides were used to evaluate the retention property and to investigate retention mechanism by the models designed for description of partitioning and surface adsorption through adjusting ratio of water in the mobile phase . Parameters affecting chromatography behavior such as ionic strength , buffer pH and column temperature were also investigated. Results have indicated that the retention mechanism was a combination of partitioning and surface adsorption, and the hydrogen bond seemed to be the main force for the retention behavior. Finally, the new 3‑aminophenylboronic acid-functionalized based on silica stationary phase was applied to separate chito-oligosaccharide samples with optimized mobile phase conditions and showed acceptable chromatograms.
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CARBON
·
2017
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IF 6.337
Piaopiao Wei,Jian Shen,Kangbing Wu,Chengguo Hu
We report on the study of the electrochemical behavior of liquid exfoliated graphene nanosheets (GS) with varied sizes and thickness by controlling centrifugal speed. GS were prepared via a solvent exfoliation and centrifugation separation method from graphite powder using N-methyl-2-pyrrolidone (NMP) as the solvent and with the assistance of sodium citrate. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectra , UV–Vis spectra and particle size measurements were employed to characterize the size and structural changes of GS under different centrifugal speeds. And, the electrochemical properties of these GS materials like redox behaviors, standard heterogeneous rate constant ( k 0 ) and electrochemical impedance were studied using potassium ferricyanide as the probe. Our results suggested that the size and concentration show obvious effects on the electrochemical properties of the solvent exfoliated GS.
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CRYSTENGCOMM
·
2018
·Vol. 20
·期 13
·1832-1843
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IF 3.304
Wenpeng Xia,Yufeng Zhang,Shanshan Hu,Jie Xiong,Jianfeng Tang,Jun Yang
Tetragonal AgLa(MoO4)2 microcrystals with novel discal hierarchical architectures were successfully synthesized via a one-step hydrothermal route. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and photoluminescence (PL) spectral analysis as well as decay lifetimes were employed to characterize the prepared products. It was found that various hierarchical architectures were obtained by altering the amount of MoO42−, pH values and surfactants, respectively. In particular, the pH value had a large influence not only on the morphology, but also on the size and crystallinity. The formation mechanism of discal hierarchical architectures was proposed on the basis of the self-assembly growth of nanosheets. The AgLa(MoO4)2 microcrystals exhibited excellent down/up-conversion (DC/UC) multicolor emissions after doping different Ln3+ ions. For DC luminescence, AgLa(MoO4)2:Ln3+ (Ln = Eu, Tb, Sm, Dy) exhibited characteristic red emission, green emission, orange emission and yellow emission, respectively. The energy transfer of MoO42− → Ln3+ (Ln = Tb, Sm, Dy) markedly enhanced the characteristic emissions of Tb3+, Sm3+ and Dy3+. For UC luminescence, AgLa(MoO4)2:Yb3+/Ln3+ (Ln = Er, Tm, Ho) exhibited intense green (2H11/2 → 4I5/2 of Er3+), blue (1G4 → 3H6 of Tm3+), yellow (5F5 → 5I8 of Ho3+) emissions, respectively. Therefore, the as-prepared AgLa(MoO4)2:Ln3+ microcrystals may have potential application to serve as fluorescent lamps, field emission display devices, sensors and biological imaging agents.
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ENERGY & FUELS
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2018
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IF 3.024
Qing-ying Li,Yingzhou Lu,Hong Meng,Chunxi Li
CuSiF6(4,4′-bipyridine)2 (SIFSIX-1-Cu) is a crystalline complex of CuSiF6 and 4,4′-bipyridine with rich microporosity, high specific area (∼1100 m2·g–1), and negligible hydroscopicity. Furthermore, this complex can be synthesized and dried under much milder conditions compared with conventional MOFs. In this paper, three complexes, SIFSIX-1-Cu(1), SIFSIX-1-Cu(2), and SIFSIX-1-Cu(3), were prepared using Cu(BF4)2, Cu(NO3)2, and CuSO4, respectively, as the copper sources, and their structure was characterized by SEM, XPS, XRD, and N2-adsorption desorption measurements. The adsorptivity of these compounds for dibenzothiophene (DBT) in model oil follows the order of SIFSIX-1-Cu(1) > SIFSIX-1-Cu(2) > SIFSIX-1-Cu(3), which is consistent with the order of their crystallinity and specific areas. The adsorption amount of SIFSIX-1-Cu(1) is 49.5 mg-S·g–1 for DBT model oil at an equilibrium sulfur concentration of 700 ppm and 303.15 K, and follows the order of DBT > benzothiophene (BT) > 3-methylthiophene (3-MT) for other sulfur compounds. The adsorptive desulfurization performance of SIFSIX-1-Cu is one of competitive sorbents among MOFs. The used sorbent can be regenerated easily by methanol washing and can be reused with an approximately 11% loss of adsorption capacity after five cycles. This study reveals the potential application of microporous crystal complexes for fuel desulfurization.
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RSC Advances
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2018
·Vol. 8
·期 2
·1132-1139
·
IF 2.936
Xiaoming Fu,Zhiwei Peng,Chi Zhang,Yong Xia,Jianbing Zhang,Wei Luo,L. Jay Guo,Honglang Li,YuHuang Wang,Daoli Zhang
Organometal halide perovskite nanocrystals hold vast potential for application in photovoltaics, light emitting diodes, low-threshold lasers, and photodetectors due to their size-tunable bandgap energies and photoluminescence as well as excellent electron and hole mobilities. However, the synthesis of such nanocrystals typically suffers from poor structural stability in solution and the coexistence of lamellate nanocrystals (nanoplatelets) and spherical nanocrystals (nanoparticles). Here we show that the pure nanoparticle morphology of CH3NH3PbBr3 nanocrystals can be realized by employing lead oleate (Pb(C17H33COO)2) as the sole lead source and controlled using short- and long-chain mixed alkyl ammonium. These nanocrystals are monodispersed (2.2 ± 0.4 nm in diameter), highly fluorescent (with a quantum yield approaching 85%), and highly stable in the solution (for more than 30 days). Comparative studies reveal that the shape of CH3NH3PbBr3 nanocrystals is strongly dependent on the lead source, PbBr2 and Pb(C17H33COO)2, and evolves as a function of the ratio of short- and long-chain alkyl ammoniums in the precursors. At an optimal short to long-chain alkyl ammonium ratio of 4 : 6, the growth of CH3NH3PbBr3 nanoplatelets can be selectively suppressed with Pb(C17H33COO)2 as the sole lead source, enhancing the overall photoluminescence quantum yield of the produced CH3NH3PbBr3 nanocrystals. This work reveals important new insights for controlled synthesis of perovskite nanocrystals with pure crystal shape and significantly improved photoluminescence properties and stability.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2024
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IF 6.2
Jinzhu Meng,Lilin Xiao,Qiuye Li,Ling Gong,Ping Luo,Yuanyuan Zhao,Shuilian Wang
Di-(2-ethylhexyl) phthalate (DEHP), an endocrine-disrupting chemical present in plasticized products, exerts strong modulation on the anatomy and function of the female reproductive system. However, the potential mechanisms underlying DEHP-induced regulation of prepubertal female reproductive toxicity have not yet been elucidated. Therefore, this study was designed to elucidate the molecular mechanism of ovarian injury induced by DEHP exposure in mice. Elevated serum mono-2-ethylhexyl phthalate (MEHP) concentrations, decreased levels of ovarian hormones (E2 and P4), and observed ovarian injury were found after DEHP exposure. Ovarian transcriptome analysis revealed significant alterations in ferroptosis-associated gene expression, with potential regulation by Nrf2. Subsequent analysis of ferrous iron, malondialdehyde (MDA), Western blotting, and immunofluorescence of the ovaries confirmed the RNA-seq findings. Transcriptome analysis of granulosa cells revealed a direct or indirect regulatory relationship between Nrf2 and downstream ferroptosis-related proteins following MEHP exposure. Further experiments demonstrated that ferrostatin-1 attenuated MEHP-induced ferroptosis in granulosa cells. Additionally, Nrf2 stabilization and accumulation in the nucleus of granulosa cells were observed following MEHP treatment. RNAi-mediated knockdown of Nrf2 exacerbated MEHP-induced ferroptosis in granulosa cells. This evidence indicates that DEHP exposure induces ferroptosis through regulation of the Nrf2-mediated signaling pathway in mouse ovaries, laying the groundwork for future studies aiming to develop therapeutic strategies against DEHP toxicity.
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FOOD CHEMISTRY
·
2025
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IF 9.8
Zhou Chen,Yanyin Song,Yuhan Yan,Wei Chen,Tong Ren,Aijin Ma,Siting Li,Yingmin Jia
A novel cellobiose 2-epimerase gene ( CsCEase1 ) from Clostridium sp. TW13 was successfully overexpressed. Cs CEase1, with a molecular mass of 45.0 kDa, exhibited a specific activity of 254.75 U/mg and showed optimal activity at 40 °C and pH 7.5. Using Cs CEase1, 44.30 % of lactose was converted into epilactose, yielding a production level of 26.58 g/L. An efficient purification method was developed, incorporating crystallization and β-galactosidase treatment to remove the unconverted lactose, while Saccharomyces cerevisiae was used to consume the produced glucose. Final purification with activated carbon resulted in epilactose with 98 % purity and a recovery rate of 66.47 %. Furthermore, Cs CEase1 was incubated with whey power and expired milk, achieving epilactose conversion rates of 29.65 % and 32.69 %, respectively. These findings highlight the potential of Cs CEase1 for the cost-effective and environmentally sustainable production of epilactose from dairy waste.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 24
·35678-35687
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IF 0
Qing Qishun,Zhu Shouwang,Jin Hongyang,Mei Tianhong,Liu Wei,Zhao Songjian
This study effectively addresses the rapid deactivation of manganese-based catalysts in humid environments during ozone decomposition by introducing iron-doped manganese oxide octahedral molecular sieve (Fe-OMS-2) catalysts supported on activated carbon (AC). By optimizing the doping ratio of Fe-OMS-2, the Fe-OMS-2 0.5 /AC catalyst achieves nearly 100% ozone decomposition efficiency across a wide range of relative humidity levels (0 to 60%), even at elevated air flow rates of 800 L·g −1 ·h −1 , outperforming standalone AC, Fe-OMS-2, or a simple mixture of OMS-2 and AC. The Fe-OMS-2 0.5 /AC catalyst features a porous surface and a mesoporous structure, providing a substantial specific surface area that facilitates the uniform distribution of the Fe-OMS-2 active phase on the AC surface. The incorporation of Fe 3+ ions enhances electron transfer between valence state transitions of Mn, thereby improving the catalyst’s efficiency in ozone decomposition. Additionally, the AC component protects catalytic sites and enhances the catalyst’s humidity resistance. In conclusion, this research presents a novel strategy for developing highly efficient and cost-effective ozone decomposition catalysts that enhance dehumidification, significantly contributing to industrial ozone treatment technologies and advancing environmental protection.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Lu Li,Sihong Xu,Liang Jin,Wenxing Chen,Shichang Chen
It is essential to find a depolymerization system with good catalytic activity, easy operation, and high efficiency for the degradation of waste PET. The synergistic catalytic effect of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and zinc 2-ethylhexanoate (ZnEH) in PET glycolysis was investigated. Waste PET can be more efficient when completely degraded than single organocatalyst or zinc salt or previous DBU/Zn(OAc) 2 , and the yield of BHET reaches 84.1 % under optimal reaction conditions with the molar ratio of 2:1 of DBU to ZnEH and the weight ratio of 3:1 of EG to PET, the temperature of 180 °C and at 60 minutes. By combining experimental results with density functional theory (DFT) calculations, the synergistic enhancing degradation mechanism that generates hydrogen and coordination bonds is proposed. The purified depolymerization product of BHET was repolymerized to PET, delightfully the r-PET was almost identical to virgin PET.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Xiao Song,Chuanjiang Zhou,Shengjie Liu,Zhaoqiang Wu,Hong Chen
Although polycarbonate (PC) is widely used in various applications, its inherent hydrophobicity limits its potential in applications that require high light transmittance due to surface fog caused by changes in temperature or humidity in the environment. This work presents a facile method to fabricate transparent antifogging coatings on PC substrates based on poly(2-hydroxyethyl acrylamide- co -2-aminoethyl methacrylate) (P(HEAA-co-AEMA)), in which the AEMA segments have an amino functional group that can react with the ester group on the surface of the PC substrate to form covalent urethane bonds during the heat curing process, avoiding the problems of coating susceptibility to mechanical damage, ease of peeling, etc. Moreover, HEAA units are employed as hydrophilic groups , providing antifogging performance. These antifogging coatings can be easily obtained by coating P(HEAA-co-AEMA) copolymers on PC substrates at room temperature and then curing them by thermal treatment. These transparent coatings exhibited excellent antifogging and self-cleaning performance. Furthermore, the coatings exhibited good adhesion in the cross-cut test and thermal stability in the hot water resistance test. Therefore, the present P(HEAA-co-AEMA) copolymer coatings are promising for practical antifogging applications.
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Biomaterials Research
·
2025
·
IF 9.6
Min Zhou,Ruyue Han,Wenjie Xu,Xinyan Hao,Yanjin Peng,Yucheng Tang,Pengcheng Sun,Tiantian Tang,Junyong Wu,Daxiong Xiang
Cancer continues to pose remarkable medical challenges worldwide. While current cancer therapies can lead to initial clinical improvement, they are often followed by recurrence, metastasis, and drug resistance, underscoring the urgent need for innovative treatment strategies. Atorvastatin calcium (AC), a widely used lipid-lowering and anti-inflammation drug in the clinic, has shown antitumor potential. To further improve the antitumor efficacy, we developed self-assembled AC and polydopamine (PDA) nanoparticles whose surface was coated with macrophage membranes (CM) as a biomimetic drug delivery system [AC@PDA@CM (APM)]. APM showed high drug-loading capacity, excellent stability, excellent bioavailability, and tumor-targeting ability, ultimately achieving photothermal synergistic cancer immunotherapy. Our findings indicate that APM efficiently delivers AC to tumor sites while leveraging photothermal therapy (PTT) to enhance local tumor ablation and antitumor immune effect. Notably, APM mitigates tumor immunosuppression triggered by PTT through AC, suppressing the COX-2/PGE2 pathway and immune evasion signal CD47. Furthermore, APM notably reduced nonspecific distribution and side effects, which is conducive to ensuring the safety level of medication. This integrated approach boosts therapeutic efficacy and highlights the potential of APM as a multifunctional agent for cancer therapy, paving the way for future clinical applications.
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