COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Yuyang Li,Ling Sun,Huixin Wang,Shihao Wang,Xin Jin,Zhou Lu,Chaohong Dong
Herein, a novel composite coating containing P/N/B and bio-based compounds was developed and applied to the flame-retardant finishing of polyester/cotton (T/C) blend fabrics. The flame-retardant coating was prepared with a combination of triethanolamine borate , diethylenetriamine pentamethylene phosphonic acid and calcium alginate . The combined characterization of scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) proved that the coating system has been successfully processed to the surface of T/C blend fabrics. The results of limiting oxygen index (LOI), horizontal flammability test (HFT) and vertical flammability test (VFT) showed that the P/N/B/Ca-T/C blend fabrics obtained good flame retardancy and exhibited excellent char-forming ability. Meanwhile, the thermal stability and combustion behavior of the blend fabrics before and after coating were evaluated by thermogravimetric (TG) and cone calorimetry tests. Obviously, the flame-retardant coating transformed the thermal degradation process of T/C blend fabrics and suppressed their heat and smoke release during combustion. Furthermore, Fourier transform infrared (FTIR) spectroscopy of char layers and thermogravimetric-Fourier transform infrared spectroscopy (TG-IR) analysis indicated that the composite coating exerted flame retardancy to T/C blend fabrics in both the condensed and gas phases.
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MATERIALS & DESIGN
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2022
·
IF 9.417
Shuang Liu,Limin Ma,Cheng Zhen,Yishu Wang,Dan Li,Fu Guo
Crystalline and amorphous cobalt-phosphorus (Co-P) coatings have their own advantages in interfacial diffusion resistance and mechanical ductility of solder joints, respectively, but it cannot be better at both. In this work, the hybrid crystalline-amorphous Co-P coating (Co-9.1 at.% P) was fabricated and applied on the Cu/Sn interface by controlling the crystallinity through compositional design. Combining the advantages of crystalline and amorphous Co-P, strategies for solder joints with high shear strength, ductile intermetallic compounds (IMCs) and slow interface consumption was proposed. The evolution, microstructure, phase, and mechanical properties of the Co-Sn, Co-Sn-P and P-rich layers in solid-state diffusion were systematically characterized and tested by means of SEM, EPMA, EBSD, TEM, nanoindentation, and shear test. It was found that the hybrid Co-P coating achieved a low consumption rate, 14.2 nm/h, attributing to the partially crystalline structure and the Co-Sn-P exfoliation behavior. In addition, solder joints containing large-thickness ductile Co-Sn IMCs, 3.2–3.6 GPa of hardness, was established. The shear strength after aging reached 75.4 MPa relying on the large thickness of Co-Sn IMCs. Severe mechanical loads would be able to be withstand by virtue of the plastic deformation of ductile IMCs. Hybrid crystalline-amorphous Co-P would be a promising interface material in microelectronic packaging.
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Asian Journal of Pharmaceutical Sciences
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2022
·
IF 9.273
Gaofeng Shu,Lin Shen,Jiayi Ding,Junchao Yu,Xiaoxiao Chen,Xiaoju Guo,Enqi Qiao,Yaning Chen,Chenying Lu,Zhongwei Zhao,Yongzhong Du,Minjiang Chen,Jiansong Ji
The development of novel theranostic agents with outstanding diagnostic and therapeutic performances is still strongly desired in the treatment of hepatocellular carcinoma (HCC). Here, a fucoidan-modified mesoporous polydopamine nanoparticle dual-loaded with gadolinium iron and doxorubicin (FMPDA/Gd 3+ /DOX) was prepared as an effective theranostic agent for magnetic resonance imaging (MRI)-guided chemo-photothermal therapy of HCC. It was found that FMPDA/Gd 3+ /DOX had a high photothermal conversion efficiency of 33.4% and excellent T 1 −MRI performance with a longitudinal relaxivity (r 1 ) value of 14.966 mM −1 · s − 1 . Moreover, the results suggested that FMPDA/Gd 3+ /DOX could effectively accumulate into the tumor foci by dual-targeting the tumor-infiltrated platelets and HCC cells, which resulted from the specific interaction between fucoidan and overexpressed p-selectin receptors. The excellent tumor-homing ability and MRI-guided chemo-photothermal therapy therefore endowed FMPDA/Gd 3+ /DOX with a strongest ability to inhibit tumor growth than the respective single treatment modality. Overall, our study demonstrated that FMPDA/Gd 3+ /DOX could be applied as a potential nanoplatform for safe and effective cancer theranostics
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MATERIALS RESEARCH BULLETIN
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2022
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IF 5.6
Hongcan Sun,Shuhong Xu,Zengwei Chen,Fan Liu,Shenfei Zong,Zhuyuan Wang,Chunlei Wang
Narrow band gap emissive carbon dots (CDs), especially those with full width at half maximum (FWHM) below 40 nm, is extremely important for biological imaging application due to higher color purity and better resolution. The synthesis of narrow FWHM emissive CDs usually requires the use of specific-structured molecular precursors with a large π conjugated domain. In comparison, the most common precursors for CDs, for instance p-phenylenediamine, are usually believed unsuitable for preparing CDs with FWHM emission below 40 nm. In this work, we challenged this stereotype by using p-phenylenediamine precursor to synthesize CDs with a small FWHM of only 29 nm. Instead of using traditional solvothermal method, a facile solvent-free method was developed to synthesize CDs with the powder of p-phenylenediamine in the autoclave under a reaction temperature of 200 °C. After dispersed in solution, CDs show a red emission around 615 nm with FWHM of 29 nm and a photoluminescence quantum yield (PLQY) of 12.8%. Through experiments and theoretical calculation, we found that the FWHM emission is positive correlated to the content of amino groups on the surface of CDs. In comparison to traditional solvothermal method, the current solvent-free method can promote the synthesis of CDs with less amino groups on the surface, reducing fluorescence center types, and hence realizing smaller FWHM emission. In addition, as-prepared CDs were used for biological imaging, and realized a rapid no-wash cell imaging.
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Materials Research Express
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2022
·Vol. 9
·期 11
·115502
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IF 2.025
Jiajun Miao,Yafei Zhang,Liang Yue,Xianqiang Ran,Mingzhao Cheng,Zhenzi Jing
To develop a new technology to remediate pollution sites stably and effectively, hydrothermal conversion of polluted soil (model soil) into zeolite P for in situ immobilization of Heavy Metals (HM) was carried out. Zeolite P could be synthesized from soil hydrothermally with a large range of Al/Si ratio (0.33–1.0) in 48 h at 200 °C. With immobilizing heavy metals (Cr, Zn and Cd), the crystallization of Zeolite P (Cr-ZP, Zn-ZP and Cd-ZP) was delayed with the order of Cr >Zn >Cd because the stronger the ligand effect of heavy metals have, the more heavily the nucleation and growth were influenced. During immobilization via zeolitization, a self-adaptive structuring behavior was confirmed by EDAX, BET and Rietveld refinement analyses: zeolite P structured more [AlO4]− to immobilize HM because the flexible 8-member-Ring channels (8 mRs) with higher Al/Si ratio could complex with more HM readily. The encapsulated HM occupied the original Na positions (Na1 and Na2) of zeolite P competitively because of their different cation size, e.g., the smallest Cr3+ could substitute all Na1 because Na1 is closer to the Framework Oxygen (FO); the largest Cd2+, however, substituted Na1 (9%) and Na2 (14%) evenly. The shrunken 8 mRs due to heavy metal immobilization also caused different chemical environments for different heavy metals immobilized because the smaller heavy metal cation could get closer to the framework, and also coordinated with more FO.
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Nanomaterials
·
2022
·Vol. 12
·期 10
·1759
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IF 5.719
Dazhuang Yu,Tiekun Jia,Zhao Deng,Qichen Wei,Kun Wang,Lihua Chen,Pingping Wang,Jiedong Cui
P-doped graphitic carbon nitride tubes (P-CNTS) with different P concentrations were successfully fabricated via a pre-hydrothermal in combination with a calcination process under a nitrogen atmosphere. The as-prepared samples exhibited excellent photocatalytic performance with a hydrogen production rate (HPR) of 2749.3 μmol g−1h−1, which was 17.5 and 6.6 times higher than that of the bulk graphitic carbon nitride (CNB) and graphitic carbon nitride tube (CNT). The structural and textural properties of the P-CNT samples were well-investigated via a series of characterization methods. Compared with the bulk g-C3N4, the tubular structure of the doped samples was provided with a larger specific surface area (SSA) and a relatively rough interior. Besides the above, surface defects were formed due to the doping, which could act as more active sites for the hydrogen production reaction. In addition, the introduction of the P element could effectively adjust the band-gap, strengthen the harvest of visible-light, and boost the effective separation of photogenerated charges. More interestingly, these findings can open up a novel prospect for the enhancement of the photocatalytic performance of the modified g-C3N4.Keywords:P-doped;g-C3N4;porous wall;surface defect;photocatalytic hydrogen evolution
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Journal of Materials Chemistry A
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2022
·Vol. 10
·期 35
·18147-18155
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IF 14.511
Jin Li,Kaicai Fan,Hongliang Jiang,Fenghong Lu,Lixiu Cui,Bin Li,Qi Zhang,Gao-Chao Fan,Lingbo Zong,Lei Wang
Fe–N–C single atom electrocatalysts (SAECs) with porphyrin-like Fe–N4 species are one of the most promising alternatives to the platinum-group-metal-based electrocatalysts used for oxygen reduction reaction (ORR). However, limited attention is paid on delicately optimizing the free energy barrier of Fe–N4 active sites through heteroatom doping in the carbon skeleton. Herein, Fe single atoms (SAs) on heteroatoms N- and P-codoped porous honeycomb-like carbon (Fe–N4/NP-PHC) have been rationally designed. The as-developed Fe–N4/NP-PHC catalyst with abundant accessible active sites showed an impressive onset potential (Eonset = 1.0 V) and half-wave potential (E1/2 = 0.89 V) under low electrocatalyst loading capacity, which is more positive than those of Pt/C and most SAECs. Encouragingly, the experimental results and DFT calculations systematically demonstrated that the optimized adsorption energy of the Fe–N4 sites in the P-doped carbon matrix facilitated the release of OH* and thus boosted the ORR performance. The metal–air battery containing Fe–N4/NP-PHC exhibited high peak power density and long-term working feasibility with a low voltage gap at large current densities. This study demonstrates that P doping in carbon matrix is an effective strategy to promote catalytic properties and presents a novel avenue for developing high-performance electrocatalysts for various electrochemical reactions.
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Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 19
·4458-4469
·
IF 6.813
Chengming Wu,Zhao Yang,Jifan Li,Chun-Ling Liu,Wen-Sheng Dong
A series of alkali metals (K, Rb, and Cs) doped phosphotungstic acid (H3PW12O40, HPW) catalysts were prepared by an ion-exchange method. These catalysts were characterized by various techniques and applied for the renewable production of p-xylene (PX) from biomass-derived 2,5-dimethylfuran (DMF) and ethylene. The effects of the types and amounts of the alkali metals on the catalytic activity of these catalysts were evaluated, and the relationship between the catalytic activity and acidity was established. Among these catalysts, the Cs1H2PW exhibited the best activity and PX yield. The influences of the reaction conditions i.e. the ethylene pressure, catalyst dosage, reaction temperature, and reaction time were investigated. Under the optimum reaction conditions, a high DMF conversion of 91.8% along with PX yield of 64.0% was obtained over Cs1H2PW. Also, the Cs1H2PW catalyst could be re-used at least five times with slight losses in activity. Moreover, the kinetics of the conversion of DMF to PX over Cs1H2PW was studied using a pseudo-first-order kinetic model, and a lower activation energy (57.9 KJ mol−1) was obtained.
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ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Dairui Xie,Hao Huang,Heng Zhang,Fang Shen,Meng Jiang,Xiaoting Li,Hongyan Shang,Jun Ma,Shilin Zhao
The amphiphilic humic acid ester ether (HAEE), as a kind of solid-phase extractant with characteristics of easy separation and hydrophilic–hydrophobic amphiphilic property, was prepared and used to extract micro or trace nitrofen, 2,4-dichlorophenol and p-nitrotrophenol (NIPs) from water and soil. Degradation of NIPs and extractant regeneration were carried out by simple photocatalysis. The adsorption equilibrium of the mono- or three mixed NIPs by HAEE in aqueous could be quickly reached within 20 min. The adsorption process was fit to quasi-second-order kinetics model and Friendlich thermodynamics model. The possible adsorption interaction was discussed. Results suggested that the adsorption of NIPs onto HAEE predominated by hydrogen bonding, hydrophobic interaction and π-π interaction. The extraction capacity of mixed NIPs (80 μg/L each component) by HAEE was up to 0.38 mg/g and tended to be multi-layer adsorption, in which p-nitrotrophenol had higher adsorption competitiveness because of lower resistance to HAEE. When HAEE-NIPs were degraded by photo-catalyst Fe0/F-TiO2 for 8 h, not only the adsorbed NIPs could be totally degraded and mineralized, but also the HAEE could be effectively regenerated. When the NIPs were continuously extracted from 40-year aging soil for three times (regenerative twice) by combined extractant (48 mL H2O + 2 mL n-hexane + 0.1 g HAEE), the total extraction efficiency of NIPs could reach to 84.66%. This research could supplement the theory and technique for harmless treatment of NIPs contaminated water and soil.
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Science China-Chemistry
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2022
·Vol. 65
·期 9
·1829-1837
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IF 10.138
Shi Yue,Zhang Dan,Miao Hongfu,Wu Xueke,Wang Zuochao,Zhan Tianrong,Lai Jianping,Wang Lei
Molybdenum disulfide (MoS 2 ) has become a competitive candidate for efficient and economical hydrogen evolution reaction (HER). Compared with 1T-MoS 2 , 2H-MoS 2 possesses exceptional thermodynamic stability but still suffers from low active site density, poor conductivity, and weak hydrogen bonding in the wide pH range. Herein, 2H-MoS 2 nanoflowers with phosphorus doping, sulfur vacancies and crystalline-amorphous heterojunction were synthesized via phosphorus-assisted rapid calcination method. Benefiting from the cooperative interaction of multiple strategies, the prepared 2H-MoS 2 nanoflowers firstly achieve efficient pH-universal HER at high current densities. Experimental results show that in alkaline, acidic, and neutral media, MoS 2 -P2 requires only 332, 302, and 417 mV to drive the current density of 500 mA cm −2 and obtains 932, 1100, and 472 mA cm −2 at the potential of −0.4 V vs. RHE, respectively. Moreover, MoS 2 -P2 shows excellent stability of low and high current density in the full pH range.
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Catalysts
·
2022
·Vol. 12
·期 9
·957
·
IF 4.501
Ji Chen,Shuwen Zhao,Yifan Zhao,Weijie Zhou,Ruijie Dai,Xuan Zhao,Zhengang Chen,Hua Zhang,Anran Chen
Hydrogen is the mainstream future energy source because of its high energy density and environmentally-friendly properties. In this study, Fe-Co2P/NPC materials were prepared by the wet chemical synthesis method, in which Fe-Co2P nanowires were wrapped by the N, P co-doped carbon layers (NPC) under aging and phosphorylation strategies. When Fe-Co2P/NPC/NF was subjected to hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), the overpotential was only 73 mV and 217 mV to reach the current density of 10 mA cm−2, respectively. When the cathode and anode were both Fe-Co2P/NPC/NF, a current density of 10 mA cm−2was achieved with only 1.56 V. This work provides a new idea for the design and preparation of non-precious metal-based transition metal phosphide catalysts.Keywords:transition metal phosphide;water splitting;hydrogen evolution;oxygen evolution;N, P co-doped carbon
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ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Zhendong Yu,Jiachen Ma,Jinlan Dai,Shiyu He,Xiaoyi Huang,Yuancai Lv,Yifan Liu,Chunxiang Lin,Junfeng Chen,Minghua Liu
In this study, a bimetallic composite catalyst (Co–Fe@C) was fabricated with calcination at high temperature (800 °C) by using Co-MIL-101 (Fe) as the precursor. The characterization results showed that the resulted Co–Fe@C composite mainly consisted of carbon, FeCo alloys, Fe 3 O 4 , Co 3 O 4 and FeO, and owned evident magnetism. In addition, the Co–Fe@C was employed to activate the peroxydisulfate (PDS) to degrade a representative organic pollutant ( p -arsanilic acid, p -ASA) and the main factors were optimized, which involved 0.2 g L −1 of catalyst dosage, 1.0 g L −1 of PDS dosage and 5.0 of initial pH. Under the optimal condition, Co–Fe@C/PDS system could completely degrade p -ASA (20 mg L −1 ) in 5 min. In the Co–Fe@C/PDS system, SO 4 − · , Fe(IV) and ·OH were the main species during p -ASA degradation. Under the attack of these species, p -ASA was first decomposed into phenols and then transformed into the organics acids and finally mineralized into CO 2 and H 2 O through a series of reactions like hydroxylation, dearsenification, deamination and benzene ring opening. Importantly, most of the released inorganic arsenic species (93.40%) could be efficiently adsorbed by the catalyst.
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危险品化学品经营许可证（带存储）