FOOD CHEMISTRY
·
2017
·
IF 4.529
Dezhi Yang,Xiaolan Li,Dongling Meng,Meng Wang,Yaling Yang
A magnesium–aluminum layered double hydroxides coated on magnetic nanoparticles (Fe 3 O 4 @MgAl-LDHs NPs) combined with the supramolecular solvents (SUPRASs) as the magnetic supramolecular fluids were successfully applied to the extraction and determination of four phenolic compounds (Bisphenol-A (BPA), bisphenol-AF (BPAF), tetrabromobisphenol-A (TBBPA) and 4-tert-octylphenol (4-TOP)). Magnetic supramolecular fluids (ferrofluids) composites were prepared through adding the mixture of n -octanol and tetrahydrofuran in distilled water as the supramolecular solvents into the solution containing magnetic Fe 3 O 4 @MgAl-LDHs NPs. Under the optimized conditions, the calibration curve was obtained in range of 5–1000 μg L −1 . The limits of detection (S/N = 3) for BPA, BPAF, TBBPA and 4-TOP, were obtained for 0.54, 0.48, 0.37 and 0.63 μg L −1 , respectively. The intra-day and inter-day precision (RSDs %) for bisphenols (BPs) and 4-TOP at 100 and 300 μg L −1 were in the range of 4.0–7.8. The enrichment factors were between 16 and 24.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Yu Long,Yansheng Liu,Ziming Zhao,Sha Luo,Wei Wu,Li Wu,He Wen,Ren-Qi Wang,Jiantai Ma
Pd-nitrogen-doped-carbon nanocatalysts (Pd-C/N) with different morphologies, such as porous spheres, yolk-shell and hollow structures, had been synthesized and compared. The yolk-shell Pd-nitrogen-doped-carbon nanocatalysts (YS-Pd-C/N) and hollow Pd-nitrogen-doped-carbon nanocatalysts (H-Pd-C/N) were prepared through different etch time using SiO 2 spheres as hard-templates. The as-prepared catalysts were characterized thoroughly by TEM , BET, XRD , FT-IR, and XPS . Importantly, the catalysts have moderate BET specific surface area in the range from 200 to 300 m 2 g −1 and pore volume between 0.2 and 0.3 cm 3 g −1 . The reduction of 4-nitrophenol is chosen as a model reaction to research the morphology effects of these prepared Pd-C/N catalysts with the same chemical compositions . Interestingly, H-Pd-C/N exhibited the best catalytic performance, which could be attributed to its high nitrogen content, the uniform distribution of abundant active sites, as well as the synergistic effect of graphitic C/N shell and Pd species for the catalytic reaction . Especially, the unique hollow morphology and porous shell of H-Pd-C/N made it to be a nanoreactor , which was beneficial to improve the catalytic activities. In addition, H-Pd-C/N nanocatalysts exhibited favorable stability in the recycling reactions.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Guodong Jiang,Meng Wei,Songdong Yuan,Qing Chang
4-chlorophenol could be efficiently photoreductively dechlorinated over anatase TiO 2 nanocrystals with co-exposed {0 0 1} and {1 0 1} facets, which were synthesized and further characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Although fluorine could adsorb on {0 0 1} facets to decrease their surface energy, enabling TiO 2 to expose high energy {0 0 1} facets, the surface bonded fluorine might depress the photoreductive dechlorination efficiency of 4-chlorophenol, attributed to the electron trapping role of surface ≡Ti F groups. Due to the formation of a surface heterojunction between {1 0 1} and {0 0 1} facets in a single TiO 2 nanocrystal, electrons and holes were spontaneously self-separated and selectively migrate to {1 0 1} and {0 0 1} facets, respectively. Electron trapping experiments demonstrated that photogenerated electrons are the responsible for the reductive dechlorinaton of 4-chlorophenol to phenol. To avoid the oxidative degradation of 4-chlorophenol by holes and ensure sufficient electrons to reductively dechlorinate the substrate, moderate scavengers were required in the reaction system and dissolved oxygen, which might deplete electron on TiO 2 , also should be removed. With the optimal scavengers, the conversion efficiency of 4-chlorophenol (4-CP) achieved 97.5% and the selectivity for phenol was 92.5%, which were much higher than that of commercial TiO 2 P25.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 5
·期 6
·4184-4190
·
IF 3.708
Qingwen Tian,Yong Cui,Gang Wang,Daocheng Pan
The metal chalcogenides are excellent choices as absorbers and buffer-layers in thin film solar cells. Versatile chemical approaches provide endless possibilities to prepare metal sulfide precursor solutions. Recently, Cu2ZnSnS(Se)4 thin films have played an important role in fabricating low-cost and high-efficiency solar cells. Here, we present a robust and low-cost 1,2-ethanedithiol/ethanolamine/2-methoxyethanol ternary solution process to prepare Cu2ZnSnS4 precursor solution and high-quality Cu2ZnSnS4 thin films. Low-cost Cu2O, ZnO and SnO are used as the raw materials, which can be easily dissolved in the 2-methoxyethanol solution of 1,2-ethanedithiol and ethanolamine at room temperature in air. By tuning the composition of the Cu2ZnSn(S,Se)4 thin film with a selenization process, an active-area power conversion efficiency of 7.34% has been achieved for Cu2ZnSn(S,Se)4 solar cell.
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Changzhou Chen,Xialin Ji,Jie Jiang,Jianchun Jiang
A range of carbon-encapsulated non-precious metal catalysts (Ni@C, Ce@C, Mo@C, and Zn@C) were prepared using the hydrothermal approach for the catalytic transfer hydrodeoxygenation of vanillin compound derived from lignin. The catalytic efficacy was affected by the level of acid sites, catalyst durability, and the cooperation with H-donor solvents. Analysis indicated that the thin carbon layer enclosing the active sites notably improved catalytic effectiveness and thermodynamic stability compared to alternative catalysts. Notably, Ni@C demonstrated superior catalytic performance, achieving a vanillin conversion rate of 98.72 % and an 87.12 % yield of the major product 2-methoxy-4-methylphenol under specific conditions (240 ℃, 2.0 MPa N 2 , ethanol as a solvent, 4-hour reaction time). These findings underscore the significant potential of carbon-wrapped MOF catalysts in advancing the sustainable utilization of lignin and fostering the growth of a more eco-friendly bioeconomy.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zheng Li,Jiehao Xie,Zipin Peng,Zhuo Ma,Yihui Li,Xingkun Chen,Yuan Tan,Wenshao Yang,Yunjie Ding
4-Chlorophenol (4-CP) is a pervasive environmental pollutant commonly found in wastewater and groundwater, posing great risks to both human health and the ecosystem. Catalytic hydrodechlorination (HDC) of 4-CP by utilizing hydrogen (H 2 ) as a reductant has emerged to be an efficient and sustainable way to treat pollutant water. This study focuses on the development of an efficient and stable Pd-based catalyst for the catalytic HDC of 4-CP. By incorporating an appropriate amount of Ni into Al 2 O 3 support, a NiAl 2 O 4 (NA) spinel was synthesized, enhancing the interaction between Pd and the support, leading to precise control over Pd species and oxygen vacancies. The tailored properties of the Pd/NA-1 catalyst result from meticulous adjustment of the Pd 2+ /Pd 0 ratio and oxygen vacancies, which promotes electron transfer from Pd to Ni within the NiAl 2 O 4 spinel. In comparison to the Pd/Al 2 O 3 catalyst, the Pd/NA-1 catalyst exhibits exceptional stability, with continuous operation for over 120 h without deactivation. Comprehensive characterization analyses indicate that the Pd/NA-1 catalyst effectively prevented the aggregation of Pd nanoparticles, maintaining the Pd 2+ /Pd 0 ratio at 1, which is crucial for its superior stability. This work provides valuable insights into the development of Pd-based catalysts for HDC reactions, highlighting the potential use of Pd/NA-1 catalysts in treating hazardous pollutants like 4-CP in waste systems.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Haiping Wang,Yi Xu,Qingyan Bai,Shujuan Ma,Chunmiao Bo,Junjie Ou
2-Methyl-4-chlorophenoxyacetic acid (MCPA) is one of the most widely used herbicides, so adsorption and detection of MCPA in the environment is critical. Blue fluorescent carbon dot (CD) was synthesized from citric acid and urea, which could be quenched by MCPA. Herein, bifunctional molecularly imprinted polymer (CD@MIP) was prepared on monodisperse poly (glycidyl methacrylate- co -ethylene glycol dimethacrylate) microspheres, with 4-vinylpyridine as the functional monomer, ethylene glycol dimethacrylate as the cross-linking agent, and doped with CD. The enrichment ability of CD@MIP for MCPA and fluorescence detection performance were determined. The maximum adsorption amount of MCPA was 93.9 mg g −1 as determined by isothermal adsorption experiments and was in accordance with the Langmuir adsorption model. The results of the kinetic experiments showed that the adsorption equilibrium reached within 30 min, which possessed a relatively fast adsorption rate and was in accordance with the pseudo-second-order adsorption model. Both MIP without CD and non-imprinted polymers were also fabricated and tested as references. Fluorescence experiments showed good linearity of CD@MIP in the range of 0–80 μmol. The cabbage samples were analyzed by high performance liquid chromatography with a linear range of 0.02–15 μg mL −1 , recoveries of 90.5%–98% and low relative standard deviations (RSD, n = 3) of 1.5%–5.9%. CD@MIP with excellent performance provides a feasible practical application in the detection and enrichment of MCPA.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 6
·1396
·
IF 4.6
Xiangwen Lv,Anruo Luo,Xiong Tong,Jianhua Chen,Sheng Jian
Chalcopyrite and molybdenite are vital strategic metal resources. Due to their close association in ores, flotation methods are commonly used for separation. The flotation separation method primarily employs the “copper depression and molybdenum flotation” process, enhancing the wettability difference between chalcopyrite and molybdenite through a chalcopyrite depressant. Traditional depressants often face challenges, including low selectivity, high dosage requirements, poor stability, and significant environmental pollution, highlighting the need for new, highly selective green reagents. This study introduces the novel chalcopyrite depressant 2-mercapto-6-methylpyrimidin-4-ol (MMO) for flotation separation. The influence of MMO on chalcopyrite and molybdenite flotation recovery was examined through microflotation experiments. Additionally, the effects of MMO and ethyl xanthate on surface wettability were assessed via contact angle measurements. The adsorption microstructure and interaction mechanism of MMO on chalcopyrite were elucidated using FT-IR, TOF-SIMS, and XPS analyses and DFT simulations. Results indicate that MMO enhances chalcopyrite hydrophilicity and exhibits a strong depressing effect on its flotation, while minimally impacting molybdenite recovery. Thus, it serves as an effective depressant. During adsorption, N and S atoms in MMO donate electrons to Fe and Cu ions, leading to triple bond adsorption and a stable chelate structure. These findings are crucial for achieving a greener and more efficient flotation separation of copper and molybdenum.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2024
·
IF 9.3
Jie Li,Pengpeng Shao,Weijie Geng,Peng Lei,Jing Dong,Yingnan Chi,Changwen Hu
The oxidative depolymerization of β-O-4 linkages into value-added aromatic chemicals is of great importance for lignin valorization. However, achieving highly selective and rapid cleavage of β-O-4 linkages under mild conditions remains a challenge. Herein, cobalt–cobalt oxides (Co-CoOx) supported on N-doped carbon (CoMA/C900) combined with a green and recyclable base K7HNb6O19 (KNb6) have shown remarkable activity for the one-step oxidative cleavage of lignin β-O-4 linkages. Under relatively mild conditions (100 °C, 0.2 MPa O2), a lignin β-O-4 alcohol model compound was almost completely converted within 3 h, affording a narrow product distribution of phenol (yield: 99%) and methyl benzoate (yield: 98%). Based on the control experiments, kinetic study, and spectroscopic analysis, a synergistic oxidative cleavage mechanism was proposed: CoMA/C900 activates molecular oxygen to form a superoxide radical, while basic KNb6 promotes deprotonation of secondary alcohol, and they synergistically catalyze the oxidation of β-O-4 alcohol and the rapid cleavage of Cβ–O and Cα–Cβ bonds. During the reaction, the oxidation of β-O-4 alcohol to β-O-4 ketone is the rate-determining step, while the cleavage of PP-one to phenol and methyl benzoate can be completed within 15 min. Moreover, the CoMA/C900–KNb6 catalyst is recyclable at least three times and highly active for the oxidative cleavages of other lignin models and organosolv birch lignin.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2025
·
IF 3.2
Yao Shuaikang,Zhao Jingkun,Shao Guolin,Gao Siyu,Zhai Shangru,Xiao Zuoyi,Zhang Feng
The development of a catalyst with high catalytic activity and selectivity remains a crucial challenge in the field of heterogeneous catalysis. In this work, we demonstrated a versatile procedure for the immobilization of ultrafine and monodispersed metal nanoparticles onto glutaraldehyde-crosslinked polyethyleneimine-modified calcium alginate (GLA-PEI/Ca-SA) beads. The resulting hydrogel beads underwent comprehensive characterization through scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The results revealed that well-dispersed Ag, Cu, and Ni nanoparticles, with a mean size of 3.5, 2.6, and 4.1 nm, respectively, were successfully loaded onto the surface of GLA-PEI/Ca-SA beads with porous fiber network structure. Notably, the Ag/GLA-PEI/Ca-SA exhibited outstanding catalytic activity and stability, achieving over 95% conversion within 7 successive cycles towards the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) by NaBH 4 in aqueous solution. Particularly, the Cu/GLA-PEI/Ca-SA beads displayed the highest catalytic activity for the reduction of 4-NP with a kinetic reaction rate constant of 1.56 × 10 −2 s −1 . We expect that this work will provide a novel and effective strategy to design highly efficient catalysts across various catalytic reactions. Graphical Ultrafine and monodispersed Ag nanoparticles within 5 nm on GLA-PEI/Ca-SA beads with high catalytic activity for rapid 4-NP reduction.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Qingshan Dai,Jiarui Huang,Xia Qiu,Nannan Wang,Dongmei Wang,Yongxin Li
Investigating the kinetics and mechanisms of catalytic hydrogenation reaction is important for fundamental research and chemical engineering, especially at single nanowire/nanoparticle level. In this work, we constructed a dual-functional single Pt@Au nanowire (Pt@Au NW) reaction platform, which was used for in-situ monitoring the p-nitrothiophenol (4-NTP) catalytic reduction process by using surface-enhanced Raman scattering (SERS) and UV–vis spectroscopy. The conversion of reactants and intermediates as well as the product generation during the reaction process were analyzed carefully, and the influencing factors of temperature and light were also discussed. Moreover, the density functional theory (DFT) was used to further investigate the effect of the single Pt@Au NW on catalytic hydrogenation reaction of 4-NTP. The results show that the single Pt@Au NW can be a good platform for in-situ monitoring catalytic hydrogenation reaction of 4-NTP with excellent catalytic activity, high stability, and good reproducibility, and clarified that trans -dimercaptoazobenzene ( trans -DMAB) intermediates were produced that are further converted to the p-aminothiophenol (4-ATP). The work will not only give researchers new insights into the combination of the single nanowire/nanoparticle with spectroscopic techniques, but may also inspire further in-depth studies of multifunctional catalysts for catalytic hydrogenation reaction at single entity level.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Tianhang Liu,Kaisheng Yao,Hang Li,Qi Wang,Tianhang Han,Aozhou Wang,Haili Zhao,Weiwei Lu
Developing a simple, environmentally friendly, and mild method to one-step prepare bimetallic nanoframes is pretty important but still technically challenging. In this paper, a simple and easy-to-operate ionic liquid (IL)-regulated protocol is proposed to fabricate Au–Pd superbranched trigonal nanoframes (STNFs) in water at room temperature. In the aqueous solution containing precursors (Na2PdCl4 and HAuCl4) and a reducing agent (ascorbic acid), a common IL 1-octyl-3-methylimidazolium chloride ([C8mim]Cl) was used to guide the anisotropic growth and construction of Au–Pd STNFs, brightly showing green and energy-saving characteristics. Au–Pd STNFs take shape as unique two-dimensional (2D) trigonal frameworks containing multilevel orderly branches. It is found that [C8mim]Cl is crucial to the formation of Au–Pd STNFs. Owing to the unique structures, high specific surface areas, large freestanding sizes, and probably electronic effects between Au and Pd, Au–Pd STNFs-1 exhibit dramatically enhanced catalytic activity, selectivity, durability, and convenience for recycling in the 4-nitrostyrene hydrogenation reaction. Specifically, 4-nitrostyrene can be converted completely only within 5.0 min at 25 °C under atmospheric pressure, and the selectivity toward 4-nitroethylbenzene is as high as 100% and maintains good performance after five cycles. It is expected that well-constructed Au–Pd STNFs also display advanced potential in other applications.
✓ 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）