Journal of CO2 Utilization
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2018
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IF 5.503
Qian Li,Zhuxing Sun,Haiqiang Wang,Zhongbiao Wu
In this study, hollow-structured Bi decorated g-C 3 N 4 hybrids were successfully fabricated by a simple solvothermal method and applied for the first time to the photocatalytic reduction of CO 2 . Remarkably, the composites exhibited excellent CO 2 conversion efficiencies in the presence of H 2 O under visible light irradiation compared to unmodified g-C 3 N 4 , especially for the production of CH 4 . The optimum photocatalyst 30-Bi/g-C 3 N 4 presented the best production of CO and CH 4 , approximately 3 times and 9 times as high as those of unmodified g-C 3 N 4 , respectively. A series of characterizations were conducted to explore the essence behind such an enhancement; we found that enhanced light harvesting, quick separation of photoinduced carriers and more negative conduction band, due to the formation of a Schottky junction between g-C 3 N 4 and Bi metal and the solvothermal process, co-contributed for the enhanced CO 2 conversion; A more important finding was that the surprising improvement of CH 4 yield stem primarily from the introduction of the hollow-structured Bi, which enabled the accumulation of electrons on its surface exhibiting the metal-like property. The CO 2 photocatalytic conversion process was also investigated by in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) spectroscopy and we found that HCO 3 − and CO 2 − were active intermediates over 30-Bi/g-C 3 N 4 and Bi doping could promote the activation of CO 2 . In summary, this work presented hollow-structured Bi decorated g-C 3 N 4 composites as new materials for energy applications, proving once more the meta-like nature of bismuth, and laying the groundwork for the utilization of Bi in CO 2 photocatalytic reduction processes.
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高影响因子
ELECTROCHIMICA ACTA
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2017
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IF 4.798
Wen Wu,Zhenghua Tang,Kai Wang,Zhen Liu,Ligui Li,Shaowei Chen
Peptide driven metallic nanomaterials fabrication under mild conditions has become a significant research thrust recently, thanks to its capability to generate multifunctional materials with tunable electronic and catalytic properties. Herein, peptide Z1 is employed to fabricate a series of AuPt alloyed nanoparticles with different Au-to-Pt ratios. The morphology is examined by electron microscopic techniques, and well-defined peanut-shape is observed for Au 33 Pt 67 while spherical particles are obtained for the other samples. The AuPt alloys demonstrate effective electrocatalytic activity toward both oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) and Au 33 Pt 67 exhibits the best bifunctional electrocatalytic performance. Its ORR activity is superior than commercial Pt/C in alkaline media, verified by the positive onset potential (+1.02 V vs. RHE) and large diffusion-limited current density, while its HER activity is comparable with Pt/C, evidenced by the small overpotential at 10 mA cm −2 (−171 mV vs. RHE) and low Tafel slope. Moreover, Au 33 Pt 67 exhibits markedly higher long-term durability than Pt/C for both ORR and HER. The excellent activity and stability for ORR and HER are ascribed to Au alloying Pt induced synergistic effects. The results highlight the advantages of using peptide to fabricate bi-functional or multiple functional electrocatalysts with desirable activity and robust stability.
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Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Xiaolin Shen,Zhiliang Zhu,Xiaochang Liu,Renlu Qiao,Hua Zhang,Yanling Qiu
Reutilization of spent adsorbent by converting the adsorbed organic pollutants into carbon matrix has attracted more attention in recent years, which delivers a greener way for the preparation of catalysis and environment remediation. In this work, CuBi 2 O 4 after adsorption of pollutant sulfamethazine was further transformed to a photocatalyst CBO-WC500 with high catalytic efficiency for degradation of typical pharmaceuticals. The XAFS analysis proved that Cu-C chemical bond was constructed during the preparation process. The obtained CBO-WC500 was applied to remove sulfamethoxazole (SMX) through photocatalytic Fenton-like reaction, and removal efficiency reached 88.9 % after 60 minutes with the initial 5 mg•L −1 SMX and 0.2 g•L −1 catalyst in peroxymonosulfate (PMS) system. The results showed that the introduction of carbon stem from waste improved separation of photo-generated carriers and electron transfer capability, thus more photo-induced electrons could participate in reaction with PMS. Moreover, Cu(I) and Cu(II) in CBO-WC500 with Cu-Bi-spinel structure played a vital role in PMS activation. Led by electron transportation, reactive species ( 1 O 2 , •OH, SO 4 •- ) originated from PMS contributed to degradation of SMX, and degradation pathway of target pollutant was proposed based on analysis of intermediates. Removal efficiency of CBO-WC500 for SMX kept stable after several cycles’ utilization, and it also showed decent eliminating performance of mixed pollutants in different water matrix. This study has provided a potential way for resource reuse of adsorbed pollutant and realizing reutilization of spent adsorbent as photocatalyst with higher efficiency.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Qirui Tian,Weiqing Zhou,Qiong Cai,Xiaoyun Pan,Guanghui Ma,Guoping Lian
In polydopamine (PDA)-supported in situ complex coacervation, PDA is pre-coated onto emulsion droplets, and further applied as an interlayer to support the interfacial immobilization of coacervates biopolymers. In the current research, the stepwise immobilization of gelatin (GE) and gum Arabic (GA) onto PDA layer is monitored to in-depth investigate the mechanism of PDA layer as coating material and functional substrates. GE and GA were applied as adsorbates, with different forms of PDA (spherical shell, planar solid, and nanoparticles) as substrates. Real-time observations of the binding steps were performed using quartz crystal monitor with dissipation (QCM-D) and isothermal titration calorimetry (ITC). Meanwhile, using PDA-supported coacervates as encapsulating material, sustained release of essential oil volatiles was also evaluated, either dispersed in detergent solution or freeze dried in open air. The anti-oxidation performance was determined by measuring the absorbance of lipid hydroperoxide using UV spectrophotometer. The results revealed that PDA enabled synergistic immobilization of biopolymers through chemical bonding and adhesive force during the processing of in situ complex coacervation, thus enhanced protection of core compounds with two-stage releasing kinetics and prevented hyperoxidation. Also, PDA-based colloids and substrates also exhibit controllable conformation characteristic, provide a promising prospect as versatile intermediate functional biomaterials for encapsulation.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Shaoqing Pan,Miao Cheng,Chen Ma,Huaijia Jing,Tongyu Shen,Jing Hu,Qianqian Liu,Tao Wei,Ruirui Wang,Wanfei Li,Bo Liu
With the unprecedented rise of flexible electronic technology, it is imperative to develop the matched flexible power supply systems. Magnesium ion battery (MIB), as a promising next-generation battery system, shows significant potential as a power source for flexible electronic devices. However, the research on flexible MIB remains in its infancy, and the exploration of novel and reliable flexible electrodes is crucial. Herein, a binder-free and flexible self-supporting electrode with bimetallic Bi–Sn nanoparticles anchored in carbon nanofiber (CNF@Bi-Sn) was fabricated via electrospinning method combined with subsequent calcinations, and applied to MIBs for the first time. The CNF@Bi-Sn simultaneously integrated the advantages of hierarchical porous carbon nanofiber framework, the homodisperse nanosized Bi-Sn particles, and the increased phase/grain boundaries, which were beneficial for improving the structural stability and facilitating Mg 2+ diffusion kinetics. The CNF@Bi-Sn alloy anode demonstrated impressive performance with high initial specific capacity of 738mAh/g, exceptional rate capability and outstanding cycling stability of 150mAh/g at 40 mA g −1 after 100 cycles. Significantly, the quantitative kinetic analysis, ex-situ SEM, TEM and XRD were conducted to reveal the structural evolution during cycling and the magnesium storage mechanism based on reversible two-phase alloying/de-alloying transformation reactions. Furthermore, the full batteries were assembled, demonstrating its potential for practical applications. This protocol sheds light on exploring high-performance flexible self-supporting alloy anode for future flexible power systems.
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NEW JOURNAL OF CHEMISTRY
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2015
·Vol. 39
·期 9
·7363-7371
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IF 3.086
Wen-Yong Hu,Huan Liu,Yuan-Zhi Shao
In this study, four bi-modal core-shelled contrast agents of SiO2(FITC)@Gd2O(CO3)2·H2O with varying shell thicknesses but the same cores have been prepared via a two-step wet chemistry method. The four samples were quite close to sphericity and their averaged diameters were 127, 140, 148.7 and 174.0 nm. The composition of their shells was also examined. As the shell thickness increased, the fluorescence intensity halved but the longitudinal relaxivity remained high (28, 29, 27, 24 mM−1 s−1). The measured relaxivities of the samples were more than 5.8 times higher than the relaxivity of Gd-DTPA-BMA in a 0.55 T MR (magnetic resonance) system. The levels of cytotoxicity were tested on four cell lines (293, HeLa, HFL1, MCF-7) and the results indicated that the samples were safe. The intracellular fluorescence in HeLa cells was clearly observed using laser confocal microscopy. These results showed that this material had potential for application in MR-fluorescence bi-modal imaging.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Danjun Mao,Shanshan Ding,Lingjun Meng,Yuxuan Dai,Cheng Sun,Shaogui Yang,Huan He
The novel Bi-rich Bi 4 O 5 Br 2 with tunable morphologies of two-dimentional (2D) nanosheets (NSs), three-dimentional (3D) monodisperse layered microspheres (LMs) and hollow spheres (HSs) have been successfully synthesized via an ionic liquid-in-water (IL/W) microemulsion method. Surfactant TX-100 served as the stabilizer of the IL/W microemulsion, and its concentration significantly influenced the morphology and size of the resulting Bi 4 O 5 Br 2 crystal. Possible formation mechanisms have also been discussed. UV–vis diffuse-reflectance spectra and Density function theory (DFT) calculations indicated that Bi 4 O 5 Br 2 possessed stronger visible light adsorption and more negative conduction band minimum (CBM), which is beneficial to effectively activate molecular oxygen to produce O 2 − . The photocatalytic activity of Bi-rich Bi 4 O 5 Br 2 with varied shapes was investigated and compared with BiOBr for the removal of fungicide o-phenylphenol (OPP) and antibacterial agent norfloxacin (NOR) and tetracycline hydrochloride (TC) under visible light irradiation. The as-prepared Bi 4 O 5 Br 2 HSs and LMs possess higher photocatalytic efficiency than Bi 4 O 5 Br 2 and BiOBr NSs, which is attributed to the hollow/layered spherical structures and Bi-rich strategies. The O 2 − and h + are identified to be the major photoactive species during the photo-degradation process by scavenger experiments and EPR methods. This study is expected to provide a stepping stone to purposively design and explore other novel hollow structures with controllable morphology and enhanced photocatalytic activity.
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INTERNATIONAL JOURNAL OF PHARMACEUTICS
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2016
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IF 3.994
Jingjing Li,Xuemei Zhang,Meng Wang,Xuejuan Li,Hongjie Mu,Aiping Wang,Wanhui Liu,Youxin Li,Zimei Wu,Kaoxiang Sun
The dual-ligand dendritic polyamidoamine-(polyethylene glycol) n -cyclic RGDyC peptide-(TAT peptide) (PP n R(T)) with various supplied molar ratios of polyethylene glycol (PEG) to polyamidoamine (PAMAM) (n = 5, 15, 30) were designed as drug-carriers for the treatment of neovascular diseases; their targeting and penetrating effects were subsequently evaluated. 1 H NMR demonstrated PP n R(T) was successfully synthesized. Compared with the unmodified PAMAM, in vitro cytotoxicity of PP n R(T) to αvβ3 negative cells (αvβ3-) was significantly reduced, whereas the lethality to pathologic neovascular endothelial cells (αvβ3+) was efficiently increased compared to PP n . Compared to PP 5 R(T) and PP 15 R(T), PP 30 R(T) exhibited the most selective and efficient cellular uptake by human umbilical vein endothelial cells (HUVECs, αvβ3+). Membrane interaction study indicated the cellular uptake process of PP 30 R(T) of HUVECs mainly involved specific RGD-αvβ3 recognition as well as electrostatic interactions. Intracellular localization results confirmed PP 30 R(T) was distributed in the cytoplasm in HUVECs. 3D tumor spheroids penetration studies demonstrated that PP 30 R(T) penetrated the A549 cells to reach the depths of the avascular tumor spheroids. In vivo imaging further demonstrated that PP 30 R(T) achieved profoundly improved distribution in tumor tissues where angiogenesis existed. Therefore, the bi-functional dendrimer PP 30 R(T) displayed great potential as a nano-carrier for targeted drug delivery both in vitro and in vivo , and had broad prospects as nanocarriers for the targeted treatment of neovascular diseases.
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PubMed
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
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2015
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IF 1.766
Xijia He,Xuhui Xu,Dacheng Zhou,Cuiqiong Yan,Jianbei Qiu
The copper (Cu) atoms were incorporated into the bismuth (Bi) doped silicate glasses by the copper for sodium (Cu–Na) ion exchange method. After the ion exchange process, the Cu ions were introduced into the glass matrix with different copper valence states, namely, Cu 0 , Cu + , and Cu 2 + . Bi 3 + ions could be reduced to lower valence states of Bi containing Bi near infrared (NIR) active centers with the incorporation of the Cu ions, resulting in the enhancement of the Bi NIR luminescence intensity. During the heat treatment process, some lower valence states of Bi containing Bi NIR active centers could be oxidized, resulting in the attenuation of the NIR luminescence of Bi. Our research may extend the understanding of chemical environment modulation in Bi valence states and offer a valuable way to enhance the NIR luminescence intensity of Bi in glasses.
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TALANTA
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2015
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IF 3.545
Mengzhen Dai,Ting Huang,Long Chao,Qingji Xie,Yueming Tan,Chao Chen,Wenhua Meng
Horseradish peroxidase (HRP)-catalyzed polymerization of l -DOPA (vs. dopamine) in the presence of H 2 O 2 (and uricase (UOx)) was exploited to immobilize mono-/bi-enzymes for hydroquinone-mediated amperometric biosensing of H 2 O 2 and uric acid (UA). The relevant polymeric biocomposites (PBCs) were prepared in phosphate buffer solution containing HRP and l -DOPA (or plus UOx) after adding H 2 O 2 . The mono-/bi-enzyme amperometric biosensors were prepared simply by casting some of the PBCs on Au-plated Au (Au plate /Au) electrodes, followed by coating with an outer-layer chitosan (CS) film for each. UV–vis spectrophotometry , scanning electron microscopy, cyclic voltammetry and electrochemical impedance spectroscopy were used for film characterization and/or process monitoring. The HRP immobilized by enzyme catalysis well preserved its bioactivity, as confirmed by UV–vis spectrophotometry . Under optimized conditions, the monoenzyme CS/HRP-poly( l -DOPA) (PD)/Au plate /Au electrode potentiostated at −0.1 V responded linearly to H 2 O 2 concentration from 0.001 to 1.25 mM with a sensitivity of 700 μA mM −1 cm −2 and a limit of detection (LOD) of 0.1 μM, and the bienzyme CS/UOx–HRP–PD/Au plate /Au electrode at −0.1 V responded linearly to UA concentration from 0.001 to 0.4 mM with a sensitivity of 349 μA mM −1 cm −2 and a LOD of 0.1 μM. The mono-/bi-enzyme biosensors based on biosynthesized PD performed better than many reported analogues and those based on similarly biosynthesized polydopamine.
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PubMed
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2017
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IF 2.843
Yuan Cao,Xiu-Li Wang,Wen-Qiang Zhang,Xue-Wu Yin,Yue-Quan Shi,Yu-Zhong Wang
A novel reactive phosphorus-containing flame retardant 1,4-phenylene-bis((6-oxido-6H-dibenz[c,e][1,2]-oxaphosphorinyl) methylene) diacrylate (TDCAA-DOPO), with two symmetrical 9,10-dihydro-9-oxa-10-phosphaphena-nthrene-10-oxide structure (bi-DOPO), was synthesized and combined with unsaturated polyester resin (UPR) via cross-linking to prepare flame-retardant UPR (FR-UPR). To make clear both the effects of the bi-DOPO structure and the cross-linking reaction on the thermal stability and flame retardancy of UPR, an additive flame retardant that also owned bi-DOPO structure but without a vinyl bond, 1,4-phenylene-bis((6-oxido-6H-dibenz[c,e][1,2]-oxaphosphorinyl) carbinol) (TDCA-DOPO), was used as a contrast. The results showed that the incorporation of TDCAA-DOPO or TDCA-DOPO into UPR can reduce its peak heat release rate (PHRR) and total heat release (THR), as well as improve the limiting oxygen index (LOI) value. As compared to TDCA-DOPO, the reactive TDCAA-DOPO endowed FR-UPR with enhanced thermal stability, residual char, and glass transition temperature (Tg), which were even higher than those of pure UPR. Besides, their flame-retardant mechanism for UPR had been well investigated.
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Dequan Wei,Shenghua Lv,Jingjing Zuo,Jinru Liu,Jialin Wang,Leipeng Liu,Qiao Zeng
With the rapid development of the field of flexible electronics, it is necessary to develop more new flexible sensor materials with a high degree of flexibility, stretchability, biosafety, and good electrical conductivity to better achieve wearable with the human body. Cellulose hydrogels are promising building blocks for flexible sensors due to their renewability and excellent mechanical strength properties. In this study, we demonstrate an imidazolium ionic cellulose/polyacrylic acid hydrogel (ILHPMC/PAA) with high flexibility, antimicrobial properties and electrical conductivity. Firstly, epoxidized imidazole ionic liquids were synthesized using methyl imidazole as raw material, and imidazole ionic cellulose was prepared by grafting modified hydroxypropyl methyl cellulose (HPMC). Imidazolium ionic cellulose hydrogels were prepared by one-step cross-linking and forming a copolymeric bi-network with acrylic acid according to the principle of free radical polymerisation. This hydrogel has high flexibility, stretchability, biocompatibility, and desired electrical conductivity due to the introduction of imidazole ions, and the sensing sensitivity factor (GF) reaches 6.83. The tensile strength can be up to 1.2 MPa, and it also has excellent antibacterial properties, with an antibacterial zone diameter of up to 29.25 mm. This provides insights into the development of cellulose-based sustainable sensing hydrogel sensors for wearable ionic conductive sensing.
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危险品化学品经营许可证（带存储）