APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Jiangyong Yuan,Chunqiang Lu,Zhenhua Gu,Jun Cai,Han Zhao,Danyang Li,Lei Jiang,Haiwen Xu,Zhi qiang Li,Kongzhai Li
Carbon cycling, instead of conventional oxygen cycling in chemical looping, overcomes the limitations of oxygen storage capacity of oxygen carriers and enables the reaction to proceed under relatively mild conditions. In this study, we designed a high-performance carbon-storage catalyst (Ni-Co/Al 2 O 3 ) for chemical looping conversion of CH 4 and CO 2 to H 2 and CO. The physico-chemical characterizations suggested that the Co alloyed with Ni could result in larger active metal particles and simultaneously benefit the bending of carbon deposits toward the periphery of the active sites, avoiding the quick deactivation of catalysts due to the encapsulation of the active sites by carbon deposits and generating a higher carbon capacity (23.59 vs. 14.08 mol/kg). In addition, the alloying of Co with Ni could weaken the graphitization of carbon deposits, thus facilitating the carbon elimination and catalyst regeneration in the CO 2 conversion step, strongly improving the cycling stability during long-term testing.
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NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 16
·7239-7246
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IF 3.591
Ting Zeng,Hongyan Miao,Likui Wang,Yun Liu,Gang Shi,Bolong Yao
We demonstrate a facile and effective approach to prepare nitrogen/phosphorus co-doped porous carbon materials by means of carbonizing cyclomatrix polyphosphazene, which is synthesized by a polycondensation reaction of p-phenylenediamine and hexachlorocyclotriphosphazene. The samples prepared at different carbonization temperatures have a hierarchical porous structure, which provides channels for the transport and storage of electrons and ions. In addition, the specific surface area and the degree of graphitization increase with increasing carbonization temperature, while the content of nitrogen and phosphorus atoms decreases with the increasing carbonization temperature. The sample prepared at 1000 °C has the largest specific surface area of 1785 m2 g−1. The cyclic voltammetry and galvanostatic charge–discharge tests show that the sample prepared at 900 °C (NP-MCP-900) has the highest capacitance, 323 F g−1, at a current density of 1 A g−1, together with excellent rate performance and cycle stability.
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JOURNAL OF BIOMATERIALS APPLICATIONS
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2021
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IF 2.646
Qiang Li,Dongsheng Fu,Jie Zhang,Tianyang Li,Huifang Wang,Wenjuan Hou,Baolong Niu,Ruijie Guo,Yiming Liu
Encapsulation of therapeutic molecules into nanocarrier is an extensively explored strategy to treat cancer more effectively. In this study, pH-responsive targeting dual-agent delivery nanoparticles were prepared, into which hydrophilic doxorubicin hydrochloride (DOX) and hydrophobic curcumin (CUR) were entrapped. Tyrosine (Tyr) was grafted onto poly(aspartic acid) (PASP) to produce PASP-Tyr, the following reaction between hyaluronic acid (HA) and ethylenediamine (EDA) modified PASP-Tyr formed the nanocarrier HA-EDA-PASP-Tyr (HEPT), and the loading capacity was up to 50.9 ± 4.3% for CUR and 26.0 ± 1.9% for DOX. The spherical HEPT with the mean particle size of 142.9 ± 11.4 nm expanded and deformed into petaloid pattern with an increased size of about 2 µm when triggered by the acidic microenvironment. In vitro anticancer activity evaluation revealed that the co-loaded (DOX+CUR)@HEPT nanoparticles presented higher cytotoxicity against HCT-116 cells compared with that of the free combination of (DOX+CUR). Confocal laser scanning microscopy observation indicated that HEPT carrier promoted cellular uptake of drugs by means of active targeting capacity of HA ligand. With high loading capacity and tailored carrier structure, the nanoparticles formulations may offer a new strategy for cancer treatment.
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INORGANICA CHIMICA ACTA
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2021
·
IF 2.545
Ping-Ping Sun,Yi-Ming Li,Yu-Hang Zhang,Hongwei Shi,Fa-Nian Shi
Herein, we designed and prepared a one-dimensional (1-D) cobalt-based metal organic coordination polymer (2,4-pdc-Co) by hydrothermal method. 2,4-pdc-Co has the molecular formula of Co 4 (H 2 O) 10 (2,4-pdc) 4 and possesses orthorhombic symmetry Pna 2 1 space group. In the same synthesis method, we added urea as a template. On the premise of maintaining this 1-D microstructure, we modified the block-shape 2,4-pdc-Co into a 1-D wire (2,4-pdc-Co-W). As an electrode material for supercapacitors, compared with 2,4-pdc-Co, the modified 2,4-pdc-Co-W shows better electrochemical performance. The specific capacitance of the optimized electrode material can reach 325 F g -1 at 1 A g −1 . 2,4-pdc-Co-W is also assembled with activated carbon to form a battery-type hybrid supercapacitor. As the positive material for the device, an assembled hybridcapacitor delivers an energy density of 17.7 Wh kg −1 at power density of 400 W kg −1 .
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
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IF 6.551
Xingwen Lu,Zebiao Huang,Zhihong Liang,Zhe Li,Jiani Yang,Yujie Wang,Fei Wang
Struvite recovered from wastewater can be used as a slow-release fertilizer. Nevertheless, hazardous metals easily precipitated with struvite would increase the ecological risk for its agricultural use. In this study, the influence of individual and coexistence of Cu and Zn on the precipitation of struvite was investigated. The loading of Cu and/or Zn in precipitates increased with the increase of initial metal concentrations (0.1–100 mg/L). Quantitative X-ray diffraction (QXRD) analysis revealed that the increase of Cu and/or Zn level in reaction solution disturbed crystal growth of struvite and promoted the formation of amorphous phase(s). Scanning electron microscopy (SEM) revealed the pit formation on struvite crystal surfaces, combined with X-ray photoelectron spectroscopy (XPS) data, the results indicated a surface interaction for the formation of Cu-OH and Cu-NH 3 on struvite surface at Cu of 0.1–10 mg/L. With the increase of Cu to 25–100 mg/L, the precipitation of amorphous Cu phosphate(s) was confirmed by XPS and QXRD. At Zn of 0.1–10 mg/L, the enrichment of Zn-PO 4 and Zn-OH on struvite surface was observed, whereas, the precipitation of amorphous Zn hydroxide(s) was confirmed at Zn of 25–100 mg/L. At Cu and Zn co-existed solution, the decrease of Cu-PO 4 and increase of Zn-PO 4 suggested the competitive binding of PO 4 between Cu and Zn. In addition, the formation of amorphous Mg hydroxide(s) and phosphate(s) was detected regardless of the addition of Cu in solutions. The overall results revealed that the existence of Cu and Zn during struvite formation can greatly affect its content by formation of different metal-containing products.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Shanshan Sun,Haizhen Wang,Kang Yan,Jun Lou,Jiahui Ding,Shane A. Snyder,Laosheng Wu,Jianming Xu
A highly eff ;ective phenanthrene (PHE)-degrading co-culture containing Rhodococcus sp. WB9 and Mycobacterium sp. WY10 was constructed and completely degraded 100 mg L −1 PHE within 36 h, showing improved degradation rate compared to their monocultures. In the co-culture, strain WY10 played a predominant role in PHE degradation. 1-hydroxy-2-naphthoic acid was an end-product of PHE degradation by strain WB9 and accumulated in the culture medium to serve as a substrate for strain WY10 growth, thereby accelerating PHE degradation. In turn, strain WY10 degraded PHE and 1-hydroxy-2-naphthoic acid intracellularly to form phthalate and protocatechuate that were exported to the culture medium through efflux transporters. However, strain WY10 cannot take up extracellular phthalate due to the absence of phthalate transporters, restricting phthalate degradation and PHE mineralization. In the co-culture, phthalate and protocatechuate accumulated in the culture medium were taken up and degraded towards TCA cycle by strain WB9. Therefore, the metabolic cross-feeding of strains WB9 and WY10 accelerated PHE degradation and mineralization. These findings exhibiting the synergistic degradation of PHE in the bacterial co-culture will facilitate its bioremediation application.
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Chemosensors
·
2020
·Vol. 8
·期 4
·109
·
IF 3.108
Yuhang Zhang,Dongliang Cheng,Zicheng Wu,Feihu Li,Fang Fang,Zili Zhan
The conventional CO electrochemical gas sensor uses aqueous H2SO4solution as electrolyte, with inevitable problems, such as the drying and leakage of electrolyte. Thus, research on new alternative electrolytes is an attractive field in electrochemical gas sensors. In this paper, the application of a new fumed SiO2gel electrolyte was studied in electrochemical gas sensors. The effects of fumed SiO2and H2SO4contents on the performance of the CO gas sensor were investigated. The results showed that the optimized composition of the SiO2gel electrolyte was 4.8% SiO2, 38% H2SO4, and 0.005% polyvinyl alcohol (PVA). Compared with aqueous H2SO4, the gel electrolyte had better water retention ability. The signal current of the sensor was proportional to the CO concentration. The sensitivity to CO was 78.6 nA/ppm, and the response and recovery times were 31 and 38 s, respectively. The detection limit was 2 ppm. The linear range was from 2 to 500 ppm. The gel electrolyte CO sensor possesses equivalent performance to that with aqueous electrolyte.Keywords:fumed SiO2;gel electrolyte;electrochemical sensor;CO gas sensor
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Yahui Wang,Xuandong Li,Xijiang Han,Ping Xu,Liru Cui,Honghong Zhao,Dawei Liu,Fengyuan Wang,Yunchen Du
Transition metal carbides with good chemical stability and moderate dielectric constants are becoming popular electromagnetic (EM) absorption materials. In this work, Mo 2 C/Co/C composites, a ternary loss system (conductivity loss, polarization loss, and magnetic loss) for EM absorption, have been successfully fabricated by rationally regulating the growth of ZIF-67 on the surface of MoO 3 nanorods and subsequent pyrolysis process. The chemical compositions of Mo 2 C/Co/C composites indeed play a dominant role in tailoring their EM functions. It is revealed that conductivity loss, polarization loss, and magnetic loss are together responsible for the attenuation of EM energy. Although the involvement of Mo 2 C nanoparticles weakens magnetic loss capability to some extent, there will be a positive reinforcement in conductivity loss through the synergistic effects among different components. In addition, Mo 2 C nanoparticles can further provide considerable dipole orientation polarization and interfacial polarization. Among these ternary composite, MCC-50 with 30.9% of carbon, 53.6% of Mo 2 C, and 15.5% of Co, exhibits the best EM absorption performance, whose reflection loss intensity and qualified response bandwidth are superior to those of most carbide-based composites in previous studies. These results suggest that the rational integration of components with different loss mechanisms will be an effective pathway to enhance EM absorption.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Qiuyu Cheng,Xin Chen,Lin Liu,Peng Jiang,Deshi Song,M.A. Subramanian
Novel green and blue chromophores based on Ni/Co/Cr doped BaMg 6 Ti 6 O 19 solid solutions are successfully synthesized through a solid-state reaction. The crystal structure of all the samples belongs to the magnetoplumbite structure with the space group of P 6 3 / mmc . The BaMg 6- x /2 Ti 6- x /2 Ni x O 19 (0 ≤ x ≤ 0.3) compounds exhibit a light green ( x = 0.1) to yellow-green ( x = 0.3) color. The oxidation state of Ni is confirmed to be +2 valence and the d-d transition of Ni 2+ in octahedral sites is responsible for color. BaMg 6- x /2 Ti 6- x /2 Co x O 19 (0 ≤ x ≤ 0.3) series show a blue color and the intensity of blueness is increasing with the increase of Co content. The blue color is due to d-d transitions within Co 2+ present in the tetrahedral sites. For BaMg 6- x /2 Ti 6- x /2 Cr x O 19 (0 ≤ x ≤ 2) phases the color varies from light green ( x = 0.2) to green ( x = 2). Chromium exists in +3 and + 6 oxidation states and the observed color is due to charge transfer transition between Cr 3+ –Ti 4+ and d-d transitions within octahedral Cr 3+ sites resulting in strong absorption in the visible region. The synthesized colored oxides are mixed with PMMA to prepare novel green and blue PMMA polymer composites to evaluate their compatibility in plastics.
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Regenerative Biomaterials
·
2021
·Vol. 8
·期 3
·
IF 6.353
Wang Qiaoying,Wu Changqiang,Li Xiaoting,Yang Dixiao,Shi Liangjun
We have designed and developed an effective drug delivery system using biocompatible polymer of poly (ethylene glycol)-polyaspartic acid (mPEG-PAsp) for co-loading the chemotherapy drugs paclitaxel (PTX) and cisplatin (CP) in one nano-vehicle. This study aimed to improve the anti-cancer efficacy of combinations of chemotherapy drugs and reduce their side effects. mPEG-PAsp-(PTX/Pt) nano-micelles disperse well in aqueous solution and have a narrow size distribution (37.8 ± 3.2 nm) in dynamic light scattering (DLS). Drug release profiles found that CP released at pH 5.5 was significantly faster than that at pH 7.4. MPEG-PAsp-(PTX/Pt) nano-micelles displayed a significantly higher tumor inhibitory effect than mPEG-PAsp-PTX nano-micelles when the polymer concentrations reached 50 μg/mL. Our data indicated that polymer micelles of mPEG-PAsp loaded with the combined drug exert synergistic anti-tumor efficacy on SKOV3 ovarian cells via different action mechanisms. Results from our studies suggested that mPEG-PAsp-(PTX/Pt) nano-micelles are promising alternatives for carrying and improving the delivery of therapeutic drugs with different water solubilities.
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Nanomaterials
·
2019
·Vol. 9
·期 11
·1520
·
IF 4.034
Lei Qiu,Jiaxiong Xu,Xiao Tian
Ag and Mn dopants were incorporated into Cu2ZnSnS4thin film to reduce defects in thin film and improve thin film properties. Sol–gel and spin-coating techniques were employed to deposit Ag and Mn co-doped Cu2ZnSnS4thin films. The structures, compositions, morphologies, and optical properties of the co-doped thin films were characterized. The experimental results indicate the formation of kesterite structure without Ag and Mn secondary phases. The amount of Ag in the thin films is close to that in the sols. The co-doped Cu2ZnSnS4thin films have an absorption coefficient of larger than 1.3 × 104cm−1, a direct optical band gap of 1.54–2.14 eV, and enhanced photoluminescence. The nonradiative recombination in Cu2ZnSnS4thin film is reduced by Ag and Mn co-doping. The experimental results show that Ag and Mn incorporation can improve the properties of Cu2ZnSnS4thin film.Keywords:Cu2ZnSnS4;Ag and Mn co-doping;thin films;sol–gel preparation
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SYNTHETIC METALS
·
2019
·
IF 2.87
Chen Fu,Dawei He,Yongsheng Wang,Xuan Zhao
In this study, Co nanoparticles coated with N-doped carbon films (Co@C) were fabricated using the facile one-pot method. Further, the microwave absorption performance of Co@C prepared at different calcination temperatures was evaluated. When calcinating at 700 °C, the reflection loss values of Co@C are lower than −20 dB with a thickness of 1.5–5.5 mm. The Co particles show enhanced resonation loss with the in situ growth of Co@C on the graphene oxide surface. The presence of reduced graphene oxide (RGO) can prevent agglomeration and reduce the loading content with excellent microwave absorption performance. As expected, the minimum reflection loss of Co@C/RGO reached −44.14 dB when the loading content was only 15% in a paraffin matrix. The considerable microwave absorption performance of this composite can be attributed to the enhanced impedance matching and large interface contact as well as dipolar polarization induced by RGO. This Co@C/RGO composite exhibiting enhanced microwave ability is considered to be an excellent candidate for developing lightweight microwave-absorbing materials.
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