Materials Research Express
·
2018
·Vol. 5
·期 4
·045051
·
IF 1.151
Shuai Mao,Rui Bao,Dong Fang,Jianhong Yi
Amorphous-TiO2/Cu2Cl(OH)3 (am-TiO2/Cu2Cl(OH)3) composite photocatalyst was synthesized by a facile and novel spray pyrolysis method. The morphology, crystal structure, chemical composition, optical properties, and photocatalytic activity of the composite were characterized and investigated. It was noted that heating temperature played a fundamental role in determining the morphology of the composite photocatalyst as well as the crystallinity of TiO2. Am-TiO2 was firmly anchored on Cu2Cl(OH)3 with well dispersibility and served as the main sunlight absorber. Meanwhile, Cu2Cl(OH)3 acted as not only a carrier, but also a chemical catalyst of H2O2 to produce O2 (electron acceptor). Compared with commercially available P25 specie, the composite with the addition of H2O2 exhibited higher photocatalytic performances for methyl orange (MO) degradation under simulated solar light irradiation. By considering the mechanism, the excellent performance was awarded to uniform dispersion of am-TiO2 in the unique Cu2Cl(OH)3 and superfluous electron acceptor.
研究领域:
材料科学
·
环境科学
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2026
·
IF 3.4
Dai Yanmei,Teng Jiayu,Zhang Qingyu,Sun Dongchang,Tao Zijuan,Huang Changshun,Luo Liangli,Liu Bo,Ou Zhimin
9α-Hydroxyandrost-4-ene-3,17-dione (9α-OH-AD) is a valuable intermediate for the manufacture of steroid drugs such as hydrocortisone. Its bioproduction from 4-androstene-3,17-dione (4-AD), however, is limited by the low efficiency of the two-component steroid 9α-hydroxylase (KSH) system and insufficient cofactor regeneration during whole-cell catalysis. In this work, RvKshA and RvKshB were mined and heterologously expressed, and plasmid screening identified E. coli BL21/pET28a + -RvKshA/pETDuet-1-RvKshB as the best-performing strain. Structural analyses based on molecular docking and molecular dynamics simulations clarified the cooperative catalytic mechanism of KshA and KshB, providing guidance for rational system construction. More importantly, to address the NADH supply bottleneck, we established a dual-enzyme coupling strategy by introducing formate dehydrogenase (FDH) for in situ cofactor regeneration. This design enabled efficient steroid hydroxylation, giving a 98.3% conversion at 20 mM 4-AD. When combined with high-density fermentation and fed-batch feeding, the engineered strain achieved a substrate processing capacity of 80 mM and a spatiotemporal yield of 42.8 mM/(L·day). This study provides an integrated enzymatic and bioprocess solution for improving whole-cell steroid hydroxylation efficiency and offers a practical basis for the scalable biosynthesis of 9α-OH-AD.
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ChemSusChem
·
2024
·Vol. 17
·期 12
·e202301681
·
IF 7.5
Jing Yi,Yuze Dai,Yuxuan Li,Yuhao Zhao,Yuanpeng Wu,Min Jiang,Guangyuan Zhou
Graphical A green and sustainable −COOH & −OH condensation solution polymerization method for FDCA-based polyesters. A green and sustainable −COOH & −OH condensation solution polymerization method was hereby reported for FDCA-based polyesters to avoid discoloration and toxic solvents. First, taking poly(ethylene 2,5-furandicarboxylate) (PEF) as the representative of FDCA-based polyester, enabling good white appearance PEF with M n =6.51×10 3 g mol −1 from FDCA and ethylene glycol in green solvent γ-valerolactone (GVL), catalyzed by 4-dimethylaminopyridine (DMAP) and N-(3-dimethylaminopropyl)-N’-ethylcarbodiimide hydrochloride (EDC). Additionally, the molecular weight of PEF was rapidly improved ( M n >2.5×10 4 g mol −1 ) via remelting polycondensation within minutes, with the dispersity still kept relatively low dispersity ( Đ <1.40). Importantly, the −COOH & −OH condensation solution polymerization method was successfully applied for the synthesis of various FDCA-based polyesters, including diols with varying carbon chain lengths (3 to 11 carbons) and cycloalkyl diols, especially the applicability of this method to diols containing C=C double bonds, which was found to exhibit low heat resistance. Lastly, assisting with 13 C labeled 1,4-succinic acid and in-situ 13 C-NMR, an in-depth study of the possible catalytic mechanism was proposed, by which, EDC activated FDCA, and then DMAP catalyzed it with diol to yield macromolecular chain of polyester. Overall, the results provided a green and sustainable strategy for the synthesis of FDCA-based polyesters.
研究领域:
材料科学
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化学工程
·
环境科学
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Cheng Ye,Xinyu Zheng,Lingmiao Fang,Zhanpeng Fu,Di Li,Jianjun Zhu,Deli Jiang
Designing cost-effective and efficient bifunctional electrocatalysts for overall water splitting is crucial for the production of renewable energy, yet still remains challenging. Herein, we report a bifunctional electrocatalyst assembled from CoMoP nanosheets and Cr(OH)3 nanoblocks via hydrothermal and electrodeposition methods. The strong coupling interface formed between CoMoP and Cr(OH)3 not only induces the formation of d–d orbital hybridization, exposing abundant active sites and improving charge transfer efficiency, but also accelerates the reaction kinetics, forming a stable heterostructure, thereby improving the catalytic activity and stability. Meanwhile, the prepared CoMoP/Cr(OH)3/NF electrode demonstrates overpotentials of 88 mV for the hydrogen evolution reaction (HER) and 207 mV for the oxygen evolution reaction (OER) at 10 mA cm–2. Remarkably, assembled CoMoP/Cr(OH)3||CoMoP/Cr(OH)3 requires only 1.52 V at 10 mA cm–2, outperforming most reported advanced bifunctional catalysts. This study proposes a rapid and rational strategy for constructing novel bimetallic phosphide/hydroxide heterostructured electrocatalysts.
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Light-Science & Applications
·
2020
·Vol. 9
·期 1
·1-11
·
IF 13.714
Liu Kai-Kai,Liu Qian,Yang Dong-Wen,Liang Ya-Chuan,Sui Lai-Zhi,Wei Jian-Yong,Xue Guo-Wei,Zhao Wen-Bo,Wu Xue-Ying,Dong Lin,Shan Chong-Xin
Poor stability has long been one of the key issues that hinder the practical applications of lead-based halide perovskites. In this paper, the photoluminescence (PL) quantum yield (QY) of bromide-based perovskites can be increased from 2.5% to 71.54% by introducing water, and the PL QY of a sample in aqueous solution decreases minimally over 1 year. The enhanced stability and PL QY can be attributed to the water-induced methylamino lead bromide perovskite (MAPbBr 3 )@PbBr(OH). We note that this strategy is universal to MAPbBr 3 , formamidine lead bromide perovskite (FAPbBr 3 ), inorganic lead bromide perovskite (CsPbBr 3 ), etc. Light-emitting devices (LEDs) are fabricated by using the as-prepared perovskite as phosphors on a 365 nm UV chip. The luminance intensity of the LED is 9549 cd/m 2 when the driven current is 200 mA, and blemishes on the surface of glass are clearly observed under the illumination of the LEDs. This work provides a new strategy for highly stable and efficient perovskites.
研究领域:
材料科学
·
光学
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yan Zhang,Xiaoyue Ma,Qi Tao,Xiaoli Yang,Lin Yang,Xinjun Wang,Xiaolei Wang,Qing Zhang,Zhengyu Bai
Seawater electrolysis is promising yet challenging, as the rapid multi-step deprotonation process of oxygen evolution reaction (OER), along with the Ca 2+ , Mg 2+ ions, would deplete the accessible OH − ions near the catalyst-electrolyte interface. Herein, we present the hexatantalate [Ta 6 O 19 ] 8− ({Ta 6 }), a robust H-bond acceptor (HA) to customize the interfacial H-bonds and charge transfer of the layered metal organic framework (MOF) electrocatalyst, for efficiency alkaline seawater OER. Experimental findings reveal that the {Ta 6 } cluster reconstructs the H-bond networks both in the MOF interlayers and at the catalyst-electrolyte interface, liberating more free OH − to penetrate the Helmholtz plane and adsorb onto the catalyst surface. The increased accessible OH − deepens the partial reconstruction degree of the MOF into active components. Besides, the {Ta 6 } cluster modulates the electronic configuration of Ni active sites in the MOF framework, enabling the synthesized R-MOF-Ta 6 /NF electrocatalyst to achieve a low overpotential of 235 mV at a current density of 10 mA cm −2 . Moreover, the anion exchange membrane (AEM) electrolyzer utilizing the R-MOF-Ta 6 /NF anode catalyst could operate 195 h at industrial current density (≥200 mA cm −2 ). This study presents a neoteric strategy to enhance the performance of layered catalysts for seawater OER.
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FOOD RESEARCH INTERNATIONAL
·
2026
·
IF 8.8
Yuanyuan Zhao,Yongmao Lu,Tian Yang,Shaohua Hu,Yuanyuan Yan,Xingguo Wang,Wei Wei
Multi-method strategy enhances accuracy in human milk vitamin research. • Mass spectrometry achieved precise 25(OH)D₂/₃ quantification in human milk. • Immunoassays offered rapid screening but showed a 72.98% positive bias. • Liquid chromatography profiled vitamins A and E but lacked sensitivity for D and K. • 25(OH)D₃ increased slightly, while 25(OH)D₂ declined across lactational stages. Accurate analysis of vitamin D in human milk is essential for infant nutrition but remains analytically challenging due to low levels and a complex matrix. This study evaluates a practical multi-method strategy using LC-MS/MS, ELISA, and UPLC-PDA for vitamin D analysis in human milk. LC-MS/MS precisely quantified 25(OH)D₂ and 25(OH)D₃ with assay LOQ of 0.045 ng/mL and 0.100 ng/mL, respectively. ELISA showed a 11.58 ng/mL positive bias of vitamin D which limits use for accurate quantification. UPLC-PDA profiled vitamins A and E effectively but lacked sensitivity for vitamin D. Longitudinally, LC-MS/MS results show 25(OH)D₃ and total 25(OH)D concentrations remained relatively stable, with medians ranging from 0.141 to 0.281 ng/mL and 0.263 to 0.315 ng/mL, respectively, across the study period, while 25(OH)D₂ peaked at 8 weeks before declining. This study establishes LC-MS/MS as the preferred analytical strategy for quantifying 25(OH)D 2 and 25(OH)D 3 in human milk, providing critical data to assess infant nutritional intake and guide clinical interventions. Download: Download high-res image (160KB) Download: Download full-size image
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APPLIED CLAY SCIENCE
·
2020
·
IF 4.605
Haiyan Yang,Dongshen Tong,Yuxiao Dong,Laibin Ren,Kai Fang,Chunhui Zhou,Weihua Yu
Kaolinite , a natural, abundant, low cost, and eco-friendly material, has been widely used as filler, additives, adsorbent and coatings. In the study, kaolinite was evaluated for the performance of the hydrolysis of cellulose in water. The effects of mass ratio, reaction temperature, reaction time and water amount were investigated in a batch reactor. The fresh and regenerated catalysts were characterized by XRD , FT-IR and TG-DTG. The catalytic results showed that the highest TRS yield of 38.8% was obtained on the kaolinite at 200 °C with the mass ratio of catalyst to cellulose of 0.2 for 3 h. Moreover, kaolinite was a stable catalyst after regeneration and the yield of TRS decreased from 38.8% to 38.1% after five times reuse. Kaolinite contains abundant surface Al-OH groups, and the high TRS yield for kaolinite should be attributed to the H + ions released from the surface OH groups. This work provides a promising strategy for efficient cellulose hydrolysis into fine chemicals by natural clay minerals.
研究领域:
生物化学
·
可再生资源与环境科学
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JOURNAL OF MATERIALS SCIENCE
·
2013
·Vol. 48
·期 17
·5718-5726
·
IF 2.163
Han Linbo,Zhou Ying,He Ting,Song Guosheng,Wu Fan,Jiang Feiran,Hu Junqing
A simple synthetic method has been developed for synthesis of mesoporous silica nanoparticles with versatile morphologies by adopting CTAB and C 12 –OH as dual soft templates. In such a simple method, only by regulating the dose of C 12 –OH and temperature, we can well-realize the silica nanoparticle morphological transformation from sphere to shell-like, rugby-like, peanut-like, hollow, and complex yolk–shell structures. These as-fabricated silica nanoparticles were characterized by scanning electron microscopy, transmission electron microscopy, Brunauer–Emmett–Teller (BET), and small-angle powder X-ray diffraction. The as-prepared mesoporous silica nanoparticles with versatile morphologies possessing varying BET surface areas, pore diameter, and pore distributions have some potential applications in separation, sensing, and heterogeneous catalysis.
研究领域:
材料科学
·
纳米技术
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ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Mingshu Xiao,Yuqing Miao,Weiwei Li,Yang Yang,Xiaocai Liang
In this study, a technology was developed for producing hydrogen via glycerol electrolysis. A homogeneous stock solution of a Ni catalyst was prepared, conserved and used for an alkali electrolyte with no precipitation due to the coordinative and protective effects of sodium tartrate and polyvinyl pyrrolidone (PVP). The deposition of the Ni(OH) 2 catalyst and its electrocatalysis toward glycerol occurred nearly simultaneously. Tedious and laborious procedures for preparing common catalysts and immobilizing them on an electrode surface were not required. The Ni(OH) 2 catalyst film self-repaired due to the presence of Ni in the alkali electrolyte. This technique also exhibited satisfactory electrocatalytic performance for hydrogen production via glycerol electrolysis with a high transformation efficiency and good stability. The Ni(OH) 2 electrocatalyst electrolyzed glycerol at the glassy carbon anode to produce H 2 O and CO 2 , and this H 2 O was electrochemically reduced at the Pt cathodic electrode to release H 2 . The formation of bubbles and the presence of PVP provided the anodic electrode surface a brilliant iridescence similar to that of butterfly wings due to the distributed Ni(OH) 2 nanostructures with large circular spaces and small nanoholes. Such systems using an abundance of the non-noble metal Ni have potential applications for solar energy and fuel cell development.
研究领域:
材料科学
·
化学工程
·
可再生能源
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Chuanyan Wu,Guole Zhang,Haiqian Zhao,Mingqi He,Hongguang Li,Zhuangzhuang Zhang,Jiaxin Ying,Wei Zhou
It is a promising technology to degrade benzene by using the strong oxidizing ·OH produced by H 2 O 2 decomposition. However, in practical engineering, the low yield and utilization rate of ·OH affect the degradation effect, and the development of new catalysts is the key to solve this problem. The effects of Mn-doped on the decomposition of H 2 O 2 on the surface of Cu (Mn-Cu) to obtain ·OH were studied by combining density functional theory, including the adsorption and decomposition characteristics of H 2 O 2 and the ineffective consumption reaction of ·OH on the surface. At the same time, the specific reaction process between benzene and · OH on the surface was studied, and the effectiveness improvement of various reactions on the surface of Mn-Cu was analyzed in detail. It is found that the charge transfer between Mn and Cu forms positive and negative charge centers on the surface, the O-O bond break of H 2 O 2 molecules that promote adsorption on the surface occurs homolysis, and has a significant inhibitory effect on the ineffective consumption reaction between ·OH and H 2 O 2 molecules and ·HO 2 , thus improving the yield and utilization of ·OH. At the same time, the reaction energy barrier between ·OH and benzene was significantly reduced, the energy barrier of the first stage of degradation was reduced from 206.86 kJ/mol to 27.02 kJ/mol, and the degradation efficiency of benzene was greatly improved. And the effect improvement was verified through degradation experiments. The degradation rate of Mn-Cu surface is higher than that of Cu surface at all stages, and the final degradation rate can reach about 89%. By clarifying the above reaction mechanism, it provides theoretical support for the development of new catalysts.
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DALTON TRANSACTIONS
·
2025
·
IF 3.3
Taozhu Li,Yu Liang
The application of NiTi alloys in the electrooxidation of urea is primarily based on their unique electrochemical activity and stable chemical properties. It has been found that during electrochemical cyclic voltammetry treatment, a Ni(OH)2 layer with high catalytic activity can be formed on the surface of NiTi alloys, which significantly enhances the efficiency of urea electrooxidation. Electrochemical studies reveal that NiTi@Ni(OH)2 exhibits voltage-dependent selectivity between urea oxidation and water oxidation. When the applied potential is less than 1.47 V, the electrode undergoes urea oxidation; in contrast, when the applied potential exceeds 1.54 V, the electrode reaction switches to water oxidation. That is, the selectivity between urea oxidation and water oxidation can be achieved by adjusting the applied potential, which provides a new approach for the selectivity control of electrochemical reactions.
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