JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 25
·46375
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IF 1.901
Zhixin Xiao,Yun Tan,Jianjun Ma,Di Wang,Lina Yu,Fan Yue,Shimei Xu,Jianbin Huang
A facile method was explored to synthesize thermosensitive poly[ N -isopropylacrylamide (NIPAM)- co -methacryloxyethyltrimethyl ammonium chloride (DMC)]/Na 2 WO 4 cationic hydrogels via copolymerization of NIPAM and DMC in the presence of Na 2 WO 4 . Na 2 WO 4 acted as both a physical crosslinking agent and a porogen precursor. The hydrogels were characterized by Fourier transform infrared spectroscopy, energy dispersive X-ray, thermogravimetry, environmental scanning electron microscopy, and transmission electron microscopy. Effects of various salt solutions, pH solutions on swelling were investigated. Thermosensitivity of the hydrogels were also investigated in various polar solvents at different temperatures. The resultant hydrogel showed a fast swelling rate and good salt tolerance. The hydrogels reached the swelling equilibrium within 10 min. Moreover, the swelling ratio of the hydrogels increased with the increase of the polarity of the solvent. In the water, the swelling ratio decreased with the increasing of temperature, but remained at a high level even at 80 °C since the pore structure weaken the lower critical solution temperature effect of PNIPAM. The swelling ratio increased instead in low polar solvent, while it became negligible in nonpolar solvent with the increasing of temperature. The whole swelling kinetics was fit for Schott's pseudo-second order model. The hydrogels have a great potential as catalysts and smart materials. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46375.
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ChemSusChem
·
2017
·Vol. 11
·期 4
·672-680
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IF 7.226
Yang Li,Rui Zhu,Junting Wang,Ze-Sheng Li,Niansheng Xu,Jidong Zhang,Peng Wang
Graphical It's only lateral : Two N -annulated perylene-based hole transporters were reported for perovskite solar cells. In comparison to the bulky 2-hexyldecyl, the methoxyphenyl lateral substituent can induce stronger intermolecular π–π stacking and better connectivity of the intermolecular aggregate domains in the solid films, leading to improved hole mobility and power conversion efficiency of the perovskite solar cells. Perylene derivatives are a family of well-known organic electron-transporting materials with excellent photochemical and thermal stabilities, and have been widely used in various optoelectronic devices. In this work, two diphenylamine functionalized N -annulated perylenes are reported as hole-transporting materials (HTMs) for perovskite solar cells. Through joint theoretical and experimental studies, the HTM employing a methoxyphenyl lateral substituent is found to feature a closer stacking distance and better aggregate connectivity in the solid film than its analogue with the bulky 2-hexyldecyl lateral substituent, contributing to a higher hole mobility and a remarkably enhanced device performance of perovskite solar cells. This work demonstrates the significant influence of lateral substituents of HTMs on the intermolecular packing and solid microstructure, giving a clear insight on the molecular design of high-performance organic semiconductors.
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OPTICAL MATERIALS
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2024
·
IF 3.8
Tao Xian,Xuelian Ma,Xiaofeng Sun,Chenyang Sun,Huaqing Wang,Lijing Di,Ke Ma,Hua Yang
In this work, a promising p-n type AgCl/BiFeO 3 heterojunction piezo-photocatalysts was constructed by attaching AgCl nanocubes on the surface of BiFeO 3 microdiscs. The characteristic results verified that the intimate heterojunction between AgCl and BiFeO 3 was formed. Under the simulated sunlight excitation, the photocatalytic degradation activity of dye (Acid Orange 7 (AO7) and Rhodamine B (RhB)) over BiFeO 3 can be obviously improved after the decoration of AgCl, and the 10%AgCl/BiFeO 3 sample exhibits optimum photocatalytic removal performance, which leads to ∼99.7% and ∼93.8% of AO7 and RhB degraded after 120 min irradiation. Most importantly, the piezo-photocatalytic degradation ability of 10%AgCl/BiFeO 3 sample was evaluated by the removal of tetracycline (TC) excited by simulated sunlight and ultrasonic irradiation. It is found that the 10%AgCl/BiFeO 3 sample presents more efficient piezo-photocatalytic activity compared with its piezocatalytic and photocatalytic performance, leading to a synergistic factor SF = ∼1.6, which demonstrates an outstanding synergistic improvement between photocatalysis and piezocatalysis. Furthermore, the piezo-photocatalytic degradation pathway of TC was proposed by the intermediates detection and theoretical calculation. The piezopotential of BiFeO 3 microdiscs excited by ultrasonic was simulated. The interface electric field induced by p-n heterojunction and piezoelectric polarization field caused by the ultrasonic irradiation separately promote the surface and bulk migration of generated charges, which synergistically accelerates the separation of generated charges and thus providing more charges for the catalytic reaction. This work has developed a potential efficient heterojunction-type piezo-photocatalysts for environmental purification.
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JOURNAL OF THE ENERGY INSTITUTE
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2024
·
IF 5.6
Hu Wang,Zhifeng Yao,Yong Chen,Bing Li,Xin Zhong,Mengnan Zhang,Longbin Xia,Zunqing Zheng,Mingfa Yao
Experimental and kinetic studies on the blending of ethers or diesters with larger alkanes at low temperatures are enormously scarce. In this paper, the low-temperature oxidation (LTO) kinetics model of polyoxymethylene dimethyl ether 3 (OME 3 )/ n -heptane (500 K–950 K) was established by using the jet-stirred reactor (JSR) to conduct the LTO experiments of OME 3 / n -heptane with different blending ratios. GC/MS was used to detect and quantify 17 kinds of stable products in the LTO process of OME 3 / n -heptane. The detailed OME 3 / n -heptane kinetic model was fully verified experimentally. The interaction mechanism of OME 3 / n -heptane was discussed based on the experiments and corresponding chemical kinetic analysis . Results show that the oxidative decomposition processes of OME 3 and n -heptane were significantly different, the LTO and NTC process of OME 3 were significantly weaker than those of n -heptane, but the high-temperature reactivity of OME 3 was much stronger. In addition, n -heptane significantly promoted the intermediate species CH 3 OCHO and COCOC*O of OME 3 , mainly because n -heptane significantly prolonged the LTO of OME 3 in the fuel blends. And the NTC process of the fuel blends was mainly dominated by OME 3 , while the LTO process was more influenced by n -heptane, which resulted in the weakened NTC of n -heptane and the significantly enhanced LTO process of OME 3 .
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Biomaterials Advances
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2024
·
IF 5.5
RuChen Hong,Jun Lai,DongYi Mai,Lan Li,LiJun Dai,YanJin Lu,JinXin Lin
In the realm of skin injury management, the expedited closure of wounds, prevention of scar formation, and enhancement of the healing process are of critical significance. The creation of economical dressings that effectively facilitate swift wound sealing in the initial phase of skin trauma while curbing scar development represents a promising avenue for clinical utility. Within the context of this investigation, we synthesized a novel hydrogel composed of chitosan (CS), carboxylated poly(vinyl alcohol) (PVA-COOH) via a Schiff base reaction between carboxylated PVA and chitosan, yielding networks abundant in amide bonds. Following this, a chitosan/carboxylated PVA/poly(N-isopropylacrylamide) hydrogel (CNP) was engineered by incorporating poly-N-isopropylacrylamide chains for interpenetration at ambient temperature. Our findings indicate that the CNP hydrogel exhibits favorable degradability and swelling characteristics. Moreover, it possesses favorable antimicrobial efficacy and biocompatibility. In a murine full-thickness skin injury model, the hydrogel was found to expedite wound healing by augmenting granulation tissue formation, mitigating wound inflammation, and promoting angiogenesis.
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Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Haonan Zhu,Fangyuan Wang,Yingying Cao,Yuhai Yang,Siyu Yang,Zipeng Zou,Fengjie Hu,Feng Chen,Jianping Qiu,Shuang Song
Nb 2 O 5 based photocatalysts have garnered significant attention in the field of antibiotic photodegradation due to their potential. Enhancing the efficiency of carrier separation efficiency still remains a crucial factor for optimizing photocatalytic performance. Herein, a Nb 2 O 5 /Co 3 O 4 p–n heterojunction photocatalyst was synthesized by a straightforward one-step hydrothermal method. The Nb 2 O 5 /Co 3 O 4 composites effectively utilized visible light to catalytically degrade norfloxacin, achieving 89.2% degradation in 90 min. This performance was 2.68 and 7.42-fold greater than pure Nb 2 O 5 and Co 3 O 4 , respectively. Furthermore, this composite maintained its high activity through five cycles of photocatalysis. The exceptional performance was creditable to the establishment of p-n heterojunction structure between Nb 2 O 5 and Co 3 O 4 , which effectively inhibited the electron-hole recombination and distinctly broadens the visible light adsorption region. •O 2 − and h + were confirmed as the critical active species in this process. The primary degradation pathways for norfloxacin were decarboxylation and ring-opening. This study introduced an innovative method for developing and fabricating flower-like Nb 2 O 5 -based heterojunctions for enhancing photocatalytic efficiency. This approach held significant promise for the effective treatment of antibiotic-contaminated wastewater through photocatalysis.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Yujin Li,Mingzhu Qiu,Peiqing Guo,Xuefang Lei,Shaohui Li,Ran Meng,Nali Chen,Dongxia Zhang,Xibin Zhou
Hydrogen peroxide (H 2 O 2 ) is an environmentally friendly intermediate in the environmental field and also plays an important role in human metabolism, but the production and accumulation of excessive H 2 O 2 will cause harm to the human body, resulting in serious damage to cells. Therefore, N-doped graphene quantum dots Fe 3 O 4 /Co 3 O 4 nanoparticles with core-shell structure were prepared by in-situ synthesis and precipitation. The experimental results show that the prepared Co 3 O 4 nanoparticles have more efficient peroxidase activity than Co 3 O 4 nanoparticles alone. It can catalyze the oxidation of 3, 3, 5, 5-tetramethylbenzidine (TMB) to produce a blue product (TMBox) in the presence of H 2 O 2 . In addition, Co 3 O 4 with negative charge in the shell can produce a strong electrostatic driving coordination effect with positively charged TMB, which enhances the affinity between the nanoparticles and the substrate, and selectively catalyzes H 2 O 2 oxidation of colorless TMB to turn it blue. Based on these experimental results, a simple, low-cost, and efficient colorimetric method for H 2 O 2 detection was established, which showed a sensitive response to H 2 O 2 in the range of 0.02–2.5 μM with a detection limit of 2.3 nM. In addition, due to the magnetic properties of the prepared nanoparticles, they could be easily recovered by applying a magnetic field. This research provides a viable approach for magnetic nanomaterials with encouraging prospects for environmental monitoring, biosensing, and more.
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ACS Applied Nano Materials
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2024
·
IF 5.3
Congyue Sun,Zhongcheng Zhao,Dongyan Xu,Xiaojin Li,Ke Ye
The rapid development of proton-exchange membrane fuel cells needs to develop Pt-based oxygen reduction reaction (ORR) catalysts with activity and stability. In this study, PtCu alloy nanoparticles were in situ anchored on an N-doped porous carbon (NC) derived from ZIF-8 with a chemical reduction method to produce a PtCu/NC catalyst with a Pt loading of 7.96 wt %. The PtCu alloy nanoparticles are uniformly immobilized on the NC with a high surface area via a metal–support interaction. The electrochemical test results demonstrated that the PtCu/NC catalyst displays remarkable activity with an E1/2 value of 0.913 V vs RHE, higher than 0.878 V vs RHE for the commercial Pt/C. The ORR mass activity of the PtCu/NC catalyst is 1.49 and 6.54 times that of PtCu/XC-72 and commercial Pt/C, respectively. The eminent ORR performance of PtCu/NC is attributed to the high specific area of NC and electron-rich Pt sites enhanced by electron transfer from the N and Cu atoms. Moreover, PtCu/NC exhibited better catalytic stability than PtCu/XC-72 and Pt/C after 3000 potential cycles, attributed to the interaction between the N atom and PtCu alloy.
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TRANSACTIONS OF TIANJIN UNIVERSITY
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2024
·
IF 6.7
Liu Weihao,Liu Qingtao,Wan Xin,Shui Jianglan
Non-precious metal electrocatalysts (such as Fe–N–C materials) for the oxygen (O 2 ) reduction reaction demand a high catalyst loading in fuel cell devices to achieve workable performance. However, the extremely low solubility of O 2 in water creates severe mass transport resistance in the thick catalyst layer of Fe–N–C catalysts. Here, we introduce silicalite-1 nanocrystals with hydrophobic cavities as sustainable O 2 reservoirs to overcome the mass transport issue of Fe–N–C catalysts. The extra O 2 supply to the adjacent catalysts significantly alleviated the negative effects of the severe mass transport resistance. The hybrid catalyst (Fe–N–C@silicalite-1) achieved a higher limiting current density than Fe–N–C in the half-cell test. In the H 2 –O 2 and H 2 –air proton exchange membrane fuel cells, Fe–N–C@silicalite-1 exhibited a 16.3% and 20.2% increase in peak power density compared with Fe–N–C, respectively. The O 2 -concentrating additive provides an effective approach for improving the mass transport imposed by the low solubility of O 2 in water.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2024
·
IF 10.8
Huihui Wang,Qian Zhao,Daiqiang Li,Zhilin Zhang,Yuan Liu,Xueli Guo,Xiaotong Li,Zhi Liu,Lian Wang,Jinzhu Ma,Hong He
Photothermal catalysis is extremely promising for the removal of various indoor pollutants owing to its photothermal synergistic effect, while the low light utilization efficiency and unclear catalytic synergistic mechanism hinder its practical applications. Here, nitrogen atoms are introduced, and Pt nanoparticles are loaded on TiO2 to construct Pt/N-TiO2-H2, which exhibits 3.5-fold higher toluene conversion rate than the pure TiO2. Compared to both photocatalytic and thermocatalytic processes, Pt/N-TiO2-H2 exhibited remarkable performance and stability in the photothermocatalytic oxidation of toluene, achieving 98.4% conversion and 98.3% CO2 yield under a light intensity of 260 mW cm–2. Furthermore, Pt/N-TiO2-H2 demonstrated potential practical applicability in the photothermocatalytic elimination of various indoor volatile organic compounds. The synergistic effect occurs as thermocatalysis accelerates the accumulation of carboxylate species and the degradation of aldehyde species, while photocatalysis promotes the generation of aldehyde species and the consumption of carboxylate species. This ultimately enhances the photothermocatalytic process. The photothermal synergistic effect involves the specific conversion of intermediates through the interplay of light and heat, providing novel insights for the design of photothermocatalytic materials and the understanding of photothermal mechanisms.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Ting Zhang,Weitao Wang,Meng He,Huan Wang,Zhen-Hong He,Yang Yang,Kuan Wang,Zhao-Tie Liu
Imines as valuable chemical intermediates can be synthesized by aerobic photocatalytic oxidation of amines, which is recognized as a promising and green route for imines synthesis. It is attractive to develop solvent-free photocatalytic oxidation of amines with high efficiency, especially with high activity and selectivity, but it is challenging. In the present work, flower-like BiOX/TiO 2 (X = Cl, Br, I) heterojunction was designed for solvent-free photocatalytic oxidation of benzylamine to N-benzylidenebenzylamine. Type II heterojunction of BiOCl/TiO 2 with 67.3 wt% of BiOCl achieved the high formation rate of 6316 µmol∙g −1 ∙h −1 and selectivity of 99 % on BiOCl/TiO 2 . To the best of our knowledge, the activity and selectivity are the highest for solvent-free photocatalytic system. The reason for the varied photocatalytic performances were investigated. The solvent-free photocatalytic mechanism was revealed and proposed. Moreover, the BiOCl/TiO 2 photocatalyst can be used for photocatalytic oxidation of varied benzylamines to imines.
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Molecular Catalysis
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2024
·
IF 3.9
Yifei Chen,Xinnan Zhao,Chen Xin,Xiuqin Dong,Hao Gong
This work explored the role of defective sites on the hydroformylation of n-butene through ligand regulation. The investigation examined the effect of modulator properties on defect sites and rhodium loading, and optimized the H 2 BDC/modulator ratio to improve catalyst activity. Atomically dispersed Rh is anchored to these highly dispersed defect sites, effectively preventing aggregation and thereby enhancing hydrogenation ability. Under optimal conditions, the catalyst achieved a conversion of 96.9 %, with an overall aldehyde selectivity of 90 %. DRIFTS analysis provided compelling evidence that Rh(CO) 2 and HRhCO species were formed on 1Rh/MOF-5-HBC, improving CO insertion capability. This study highlights the significance of MOFs as catalyst supports in enhancing performance through defect engineering. The ability of the modulator to induce defect formation was measured by p K a. Meanwhile, it has been discovered that the length differences between the modulator and the MOF organic ligand can have a significant impact on the stability of defective MOFs.
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