Catalysis Science & Technology
·
2016
·Vol. 6
·期 16
·6406-6416
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IF 5.287
Mengshuai Liu,Kunqi Gao,Lin Liang,Jianmin Sun,Li Sheng,Masahiko Arai
The combination of a metal-modified SBA-15 catalyst with potassium iodide was developed as heterogeneous dual catalysts for chemical fixation of CO2 to cyclic carbonates. It was observed that the binary Zn-SBA-15/KI catalysts were the most efficient among various metal-modified SBA-15/KI catalysts and showed an excellent synergetic effect in promoting the reaction under mild conditions. Moreover, the effects of reaction parameters on cycloaddition of CO2 with propylene oxide (PO) to propylene carbonate (PC) were optimized. Under the optimal conditions determined, the Zn-SBA-15/KI catalytic system was also versatile in CO2 cycloaddition with other epoxides. Additionally, the mechanistic details for the fixation of CO2 into a cyclic carbonate catalyzed by SBA-15/KI and Zn-SBA-15/KI were also contrastively elucidated using the density functional theory (DFT) method. The DFT results suggested that the zinc-modified and unmodified catalysts showed different coupling modes of CO2, and the ring-opening reaction was the rate-determining step in the SBA-15/KI catalyzed cycloaddition reaction, but the zinc-modified SBA-15/KI catalysts could enhance the CO2 cycloaddition, as the formation of a stable complex was beneficial to CO2 trapping. As a result, the ring-closing reaction became the rate-determining step in the Zn-SBA-15/KI catalyzed cycloaddition reaction, which was a promising result to guide the catalyst design for CO2 conversion.
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Journal of Materials Chemistry B
·
2017
·Vol. 5
·期 46
·9157-9164
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IF 4.543
Long Xu,Mingying Zhao,Yidi Yang,Yan Liang,Changzhen Sun,Wenxia Gao,Sai Li,Bin He,Yuji Pu
Low molecular weight gels (LMWGs) have significant advantages in drug delivery such as high drug loading capacity, in situ delivery of drug to the lesion site, sustaining drug release with excellent bioavailability, and minimized side effects. Here, we synthesized a reactive oxygen species (ROS)-responsive gelator to prepare an injectable gel. An anticancer drug, doxorubicin hydrochloride (DOX), and a photosensitizer, Zn(II) phthalocyanine tetrasulfonic acid (ZnPCS4), were loaded into the gel for combined chemo-photodynamic therapy. The ROS-responsive gelator was characterized by proton nuclear magnetic resonance (1H NMR) and the morphology of gels was investigated by scanning electron microscopy (SEM). The rheological properties and destruction–recovery capability of both blank and drug-loaded gels were studied. The cytotoxicity of LMWGs against 3T3 fibroblasts and 4T1 breast cancer cells was tested. The in vitro drug release of both drugs was studied and the in vivo anticancer activities of DOX–ZnPCS4-coloaded LMWGs were investigated in tumor-bearing mice. The results revealed that the injectable ROS-responsive DOX–ZnPCS4-coloaded LMWGs exhibited excellent anti-tumor efficacy by a synergistic therapy.
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POLYMER DEGRADATION AND STABILITY
·
2017
·
IF 3.386
Mei Wang,Xianghai Song,Jianchun Jiang,Jianling Xia,Mei Li
N-(2-amino ethyl) tung maleamic acid (AETMA) and N-(2-amino phenyl) tung maleamic acid (APTMA) were prepared from the ammonolysis of ethidene diamine (ED) and p-phenylenediamine (PPD) respectively with tung-maleic anhydride (TMA). Then LAETMA-Ca, LAPTMA-Ca, LABTMA-Zn and LAPTMA-Zn were separately synthesized through a one-step method and characterized by Fourier transform infrared spectrometry (FTIR), 1 H nuclear magnetic resonance (NMR) and inductively coupled plasma atomic emission spectroscopy (ICP-AES). LAETMA-Ca/LAETMA-Zn and LAPTMA-Ca/LAPTMA-Zn were both used as thermal stabilizers of polyvinyl chloride (PVC) and investigated using Congo red test, thermal aging test, ultraviolet-visible spectrometry, thermogravimetric analysis (TGA), TGA-FTIR, and TGA–mass spectrometry (MS). Their stabilizing efficiencies were compared with other common stabilizers. Dynamic mechanical of the PVC compounds were also studied. The LAPTMA-Ca/LAPTMA-Zn exhibits excellent long-term stability and better plasticization performance for PVC than other stabilizers, and thus can partly replace di(2-ethylhexyl) terephthalate in the processing of PVC. The mechanism underlying the stabilizing action of LAPTMA-Ca/LAPTMA-Zn is suggested.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Xiaoman He,Dongyang Liu,Yue Teng,Hanzhi Wang,Qirui Wu,Wei Wang,Jingzheng Ren,Liandong Zhu
The co-culture system of Chlorella sorokiniana and Aspergillus oryzae has demonstrated exceptional tolerance and efficiency in the removal of pollutants from swine manure. This study evaluates the ability of the co-culture system to remove Zn(II) and estrone, while assessing the impact of these pollutants on the system's overall functionality. Results indicated that co-cultivation achieved higher biomass accumulation, peaking at 0.88 g/L after 96 h. Increasing estrone exposure concentration reduced photosynthetic activity and chlorophyll content, whereas Zn(II) exposure initially enhanced and later inhibited chlorophyll synthesis. Co-cultivation secreted extracellular polymeric substances, including protein-like and humus-like substances, to alleviate environmental stress and form algal-fungal community. After 96 h of cultivation, the removal efficiencies reached 86.44% for 1.5 mg/L Zn(II) and 84.55% for 20 mg/L estrone. The Quantitative Structure Activity Relationship model revealed a reduction in the ecotoxicity of estrone intermediate products to varying degrees. Metabolomics analysis showed that exposure to estrone and Zn(II) significantly boosted the production of Gibberellic acid, Indole-3-acetic acid, and Zeatin riboside in Chlorella sorokiniana , while reducing Abscisic Acid levels. Furthermore, the exposure led to an increase in various metabolites in the Tricarboxylic acid cycle of the co-cultivation system, influencing the synthesis and metabolism of key biochemical components like carbohydrates, lipids, and proteins. These findings elucidate the biochemical responses of Chlorella sorokiniana - Aspergillus oryzae co-culture system to pollutants and provide insights into its potential application in the treatment of wastewater containing endocrine disrupting chemicals and heavy metals.
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INORGANICA CHIMICA ACTA
·
2017
·
IF 2.002
Hu Wang,Xia Zhang,Yu Zhao,Dongmei Zhang,Fan Jin,Yuhua Fan
Three Zn(II) complexes with a sexidentate N 2 O 4 -donor bis-Schiff base ligand, namely Zn(C 36 H 34 N 2 O 8 )·2CH 3 OH ( 1 ), Zn(C 28 H 34 N 2 O 8 S 2 )·CH 3 OH ( 2 ) and Zn(C 40 H 36 N 4 O 8 )·3CH 3 OH ( 3 ), (L 1 , C 36 H 34 N 2 O 8 = 1,2-bis(2-methoxy-6-formylphenoxy)ethane- l -phenylalanine; L 2 , C 28 H 34 N 2 O 8 S 2 = 1,2-bis(2-methoxy-6-formylphenoxy)ethane- l -methionine; L 3 , C 40 H 36 N 4 O 8 = 1,2-bis(2-methoxy-6-formylphenoxy)ethane- l -tryptophan) were synthesized and fully characterized by physico-chemical and spectroscopic methods. The X-ray crystallography shows that the metal atoms of three complexes are all six-coordinate with two nitrogen atoms from C N groups, two oxygen atoms from ether groups and two carboxylic oxygen atoms in the mono-ligand, forming a distorted octahedral geometry. Theoretical studies of the three complexes were carried out by density functional theory (DFT) Becke’s three-parameter hybrid (B3LYP) method employing the 6–31G basis set. Moreover, the antimicrobial activities of the complexes were evaluated against Escherichia coli and Staphylococcus aureus by the agar-well diffusion method. The experiment showed that complex 2 exhibited the highest antimicrobial activity. At the same time, molecular docking was investigated to determine the molecular interaction of the complexes with microbial synthase. The docking simulation exhibited that complex 2 was well embedded into the active pocket of the enzyme and showed a more stabilized structure than complex 1 and 3 . Their structure-activity relationships were further discussed.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Wenhao Xi,Tongchen Wu,Pan Wang,Wenlong Huang,Bifen Gao,Liwen He,Yilin Chen,Bizhou Lin
Transition metal phosphides (TMPs) with high electrocatalytic activity for the oxygen evolution reaction (OER) are reckoned as a substitution of precious group metals catalysts in rechargeable Zn-air battery. In this work, Co/Co 2 P heterojunction nanoparticles supported N,P-doped carbon nanosheets (Co/Co 2 P@NPCNS) were designed and prepared via a facile one-step molten salt-assisted pyrolysis process. Density function theory calculations reveal that the heterogeneous interactions of Co/Co 2 P effectively enhance the bifunctional electrocatalytic activity for oxygen reduction reaction (ORR) and OER. The synergistic interaction between the Co/Co 2 P heterojunction nanoparticles with highly exposed active sites and excellent catalytic activity and the two-dimensional doped carbon nanosheets with high conductivity contributes to Co/Co 2 P@NPCNS exhibiting preeminent bifunctional ORR/OER activity and stability with a high half-wave potential for ORR (0.87 V), a low overpotential for OER (302 mV at 10 mA cm −2 ) and a low potential gap (0.66 V). The homemade rechargeable Zn-air battery performs high peak power density (187 mW cm −2 ) and exceptional endurance. This heterogeneous interface tactic of integrating TMPs with heteroatom-doped carbon materials may shed light on the research and development of non-precious metal electrocatalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Hao Xu,Ruopeng Li,Huan Liu,Weiyan Sun,Jie Bai,Xiangyu Lu,Peixia Yang
Atomically dispersed iron–nitrogen-carbon (FesbndNsbndC) materials have been considered ideal catalysts for the oxygen reduction. Unfortunately, designing and adjusting the electronic structure of single-atom Fe sites to boost the kinetics and activity still faces grand challenges. In this work, the coordination environment engineering is developed to synthesize the Fe SA /NSC catalyst with the tailored N, S co-coordinated Fe atomic site (Fe-N 3 S site). The structural characterizations and theoretical calculations demonstrate that the incorporation of sulfur can optimize the charge distribution of Fe atoms to weaken the adsorption of OH* and facilitate the desorption of OH*, thus leading to enhanced kinetics process and intrinsic activity. As a result, the S-modified Fe SA /NSC exhibits outstanding catalytic activity with the half-wave potentials ( E 1/2 ) of 0.915 V and 0.797 V, as well as good stability, in alkaline and acidic electrolytes, respectively. Impressively, the excellent performance of Fe SA /NSC is further confirmed in Zn-air batteries (ZABs) and fuel cells, with high peak power densities (146 mW cm −2 and 0.259 W cm −2 ).
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Journal of Building Engineering
·
2024
·
IF 6.7
Wenjie Liu,Biqin Dong,Peiyu Chen,Lei Zeng,Ming Peng,Xiang Wang,Yanshuai Wang,Shuxian Hong
In situ growth of different anion-intercalated layered double hydroxide (LDH) films on steel substrates for corrosion resistance has been achieved via the electrodeposition-hydrothermal method, but its growth process remains unclear. In this study, the effects of electrodeposition potential (−1.1 to −1.4 V) on the formation and growth mechanism of Zn/Al-NO 3 − -LDH films were investigated using XRD, FTIR, and SEM techniques. The results demonstrated that weak potentials either failed to form the LDH film or caused cracks, while excessive potentials resulted in hydrogen evolution and the formation of heterogeneous ZnO. The LDH films prepared at the optimal potential of −1.3 V were dense and uniform, with an adhesion grade of 4B, exhibiting a corrosion inhibition efficiency of 80.6 % in a 3.5 wt% NaCl solution.
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LUMINESCENCE
·
2024
·Vol. 39
·期 11
·1-8
·
IF 3.2
Zhigang Wang,Jiayu Wang,Dangli Gao,Wenqian Xu,Wenna Gao,Xiangyu Zhang,Sining Yun,Xiaojun Wang
Double wavelength emitting phosphors with hypersensitive thermal response are important for optical/thermal sensors and multiplexing optical data storage technology. However, it is a daunting challenge to develop multicolor electron-trapping materials with superheat sensitivity and anomalous quenching luminescence characteristics for information storage. Here, based on the selection of host lattice and the control of doping ion types, we have designed Mn 2+ - and/or Cr 3+ -activated persistent materials with excellent fluorescence properties. Among these phosphors, Mn,Cr co-activated biphasic mixture exhibits not only sensitive anomalous thermosensitive fluorescence properties but also multicolor and multimode fluorescence emission characteristics derived from Mn and Cr simultaneously. The corresponding multimode fluorescence mechanism is proposed based on afterglow energy transfer and deepening trap effect. Especially, based on the excellent fluorescence performances, these phosphors as information storage medium demonstrate multilevel information storage by a combination of the trap multiplexing and wavelength multiplexing technologies. The study here provides not only the ideas for designing and synthesizing new electronic materials but also a material foundation for the fourth generation of optical information storage and encryption.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yafeng Jin,Fangming Han,Xiaobo Li,Haibo Shang,Huan Zhang,Li Yang,Tao Wang,Jun Chen,Guangri Xu,Cheng-Xing Cui
Accurate monitoring of hydroxyurea (HU) dosage is imperative in the administration of anticancer drugs. Existing determination methods face challenges such as operational complexity, low sensitivity, or high oxidation potentials. In this study, a novel HU electrochemical sensor (Zn/N-PC/GO/GCE) was synthesized using flower-shaped Zn/N co-doped porous carbon (Zn/N-PC) with graphene oxide (GO) through a one-step electrodeposition . The sensor features a distinctive three-step oxidation process for HU with a low oxidation potential, attributed to an electrochemical activation electrode strategy and crucial Zn/N co-doping in Zn/N-PC. Three electrons involved oxidation process of HU and Zn/N-PC/GO adsorption energy through transferred electrons and density functional theory (DFT). Under optimized conditions, the sensor demonstrated a broad linear detection range (1–1000 μM) and an impressive limit of detection (LOD) of 0.52 μM. Applicability was confirmed by analyzing HU in tablet formulations, urine and serum samples. This study presents an innovative electrochemical method for accurate HU monitoring, elucidating a potential three-step oxidation mechanism.
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JOURNAL OF COORDINATION CHEMISTRY
·
2025
·
IF 2.1
Hou Cong Li,Ming Zhu Wang,Ye Fan Zheng,Ning An,Min Hou,Jing Hu,Wen Ge Li
Three chlorinated metal complexes [Ni2(HL)2(C2H5OH)2Cl2]·2C2H5OH (complex 1), [Co(HL)(L)] (complex 2), and [Zn2(HL)2(CH3COO)2] (complex 3) derived from 5-chlorosalicylaldehyde and 2-(2-aminophenyl)-1H-benzimidazole Schiff base ligand (H2L). The crystal structures of the three complexes were characterized by elemental analysis, infrared spectroscopy, thermogravimetric analysis, X-ray single-crystal diffraction, and UV-visible absorption spectrum. The in vitro cytotoxicity of chlorinated ligand and its metal complexes were evaluated on four different tumor cell lines (A-549 lung cancer, SMMC-7721 liver cancer, MDA-MB-231 breast cancer, and CNE-2Z nasopharyngeal carcinoma), and normal ovarian epithelial cell (IOSE 80) was determined by MTT assay. The results indicated that chloro-benzimidazole Schiff base Co (III) complex (complex 2) displayed higher cytotoxicity against MDA-MB-231 cell line than cisplatin, while the cytotoxicity on IOSE 80 was lower than that of cisplatin. The results of further study of MDA-MB-231 cells by complex 2 showed that complex 2 could inhibit MDA-MB-231 cells in the G0/G1 phase, inhibit cell proliferation and migration, promote cell apoptosis, and increase intracellular ROS level. The Western blot analysis demonstrated that complex 2 could increase Bax protein expression and decrease Bcl-2 protein expression in MDA-MB-231 cells.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Jingyue He,Jiaheng Wang,Wei Wang,Jie Zhou,Linheng Zhao,Songyuan Wu,Wenqiang Chen,Jiaxu Gong,Yatang Dai
Aluminum alloys are widely used in marine engineering due to their excellent strength-to-weight ratio. However, these materials are susceptible to localized corrosion phenomena, especially pitting and intergranular corrosion in corrosive marine environments, which greatly reduces their durability. To address this challenge, we have developed an innovative GO/MXene@ZIF-8-BTA nanocomposite epoxy coating system that strategically integrates multilayered GO/MXene heterostructures with ZIF-8 nanoparticles encapsulated with benzotriazole (BTA). Comprehensive characterization of physicochemical properties, colloidal stability, surface wettability, and corrosion protection properties confirmed the homogeneous dispersion and excellent compatibility of the nanocomposites. Electrochemical impedance spectroscopy (EIS) showed a low-frequency impedance modulus of 1.08 × 10 8 Ω•cm 2 , which is two orders of magnitude higher than that of the pristine epoxy resin after 21 days of immersion in a 3.5 wt% NaCl solution. The autonomous self-healing function was verified by a scratch test, where the corrosion rate was suppressed to 0.152 mpy in 48 hours (protection efficiency of 84.41%). Complementary density-functional theory (DFT) simulations provide atomic-scale insight into the energetics of adsorption, suggesting a pioneering approach to the long-term protection of aluminum alloys under extreme ocean service conditions.
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