APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Xinxin Han,Bingjie Lu,Xin Huang,Cheng Liu,Shixia Chen,Jingwen Chen,Zheling Zeng,Shuguang Deng,Jun Wang
S-scheme photocatalysts are more efficient than the conventional type-II configuration, but the CO 2 reduction performances are still unsatisfactory. Herein, we firstly report the layered double hydroxide (LDH) based S-scheme heterostructure photocatalyst (NiIn LDH/In 2 S 3 ) with n-type NiIn LDH and p-type In 2 S 3 . The built-in internal electric field directs the photogenerated electrons flow from the conductive band of In 2 S 3 to the valance band of NiIn LDH, which is confirmed by operando and theoretical experiments. The CO 2 photoreduction intermediates are monitored by in-situ Raman spectra, and the density functional calculations disclose the reduced energy barrier for CO desorption on the heterojunction. Therefore, without cocatalysts or sacrificial agents, the NiIn LDH/In 2 S 3 heterojunction delivers a high CO yield rate of 29.43 μmol g −1 h −1 under visible light irradiation, ca. 3.5 and 4.3 times higher than the single counterpart NiIn LDH and In 2 S 3 . Notably, this value is the highest among S-scheme CO 2 photocatalysts and surpasses most top-ranking benchmarks.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Dan You,Zhiquan Pan,Qingrong Cheng
Combining the advantages of inorganic semiconductor and organic semiconductor is an effective way to construct heterojunction to improve the photocatalytic activity of materials. In this work, two covalent triazine framework (COFs-Ph)-based heterojunctions, which named hollow COFs-Ph@CdS and solid COFs-Ph@CdS, were synthesized by a facile hydrothermal method . And they were developed for the photocatalytic hydrogen evolution and efficient degradation for tetracycline (TC), 2,4-dichlorophenol (2,4-DCP), rhodamine B (RhB) under sunlight irradiation for the first time. Compared with solid COFs-Ph@CdS, hollow COFs-Ph@CdS catalysts exhibited a significantly enhanced activity for the photodegradation of various pollutants and photocatalytic hydrogen evolution. Under the simulated sunlight, the degradation rate of TC, 2,4-DCP, RhB by hollow COFs-Ph@CdS-3 was 87.2 %, 95.4 %, 82.6 %, respectively. The hydrogen production rate of hollow COFs-Ph@CdS-4 was 726 μmol·h −1 ·g −1 . Based on the experimental results, it found that the interactions between CdS nanospheres and COFs-Ph could enhance the sunlight harvesting and created a new pathway to extend the service life of photogenerated charge carriers via facilitating the electron transfer through the loaded CdS nanospheres. Furthermore, the results verified that the matched band structure between COFs-Ph and hollow CdS could induce a superfast S-scheme interfacial charge transfer path. Therefore, a reasonable S-scheme charge transfer mechanism was proposed based on the active species trapping experiments and the results of electron spin resonance (ESR). More importantly, hollow COFs-Ph@CdS-3 possessed a good stability and reusability after recycling five times, that showed application prospect for solar-to-chemical energy conversion.
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ACS Applied Nano Materials
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2022
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IF 6.14
Lei Cao,Mengyan Zhou,Jiaxi Wang,Qiang Zhu,Tingting Liu,Shushu Ding,Ding-Yi Fu
Gold–silver alloy nanoclusters (AuAgNCs) were synthesized, protected by glutathione S-transferase (GST). The as-prepared GST-AuAgNCs displayed strong (QY = 15.9%) fluorescence with two emission peaks around 477 and 653 nm under excitation of 395 nm. In this system, both the NC core and the organic shell contributed to the development of a “turn-on” ratiometric fluorescent probe for sensitively and selectively detecting oxytetracycline (OTC). First, the green fluorescence at 477 nm enhanced with the addition of OTC into GST-AuAgNC solution, whereas the red fluorescence at 653 nm remained unchanged. This “turn-on” ratiometric fluorescence may stem from the aggregation-induced emission effect and the reduction of Ag(I). The fluorescence ratio of GST-AuAgNCs displayed good linearity when the concentration of OTC was in the range of 0∼50 μM, and the detection limit was achieved down to 32.66 nM. Second, benefiting from the strong interaction between GST and OTC, the proposed method exhibited good anti-interference toward OTC in comparison with the common ions and natural amino acids. Moreover, the variation of ratiometric fluorescence intensity resulted in the corresponding red-to-green fluorescent color change, which could be employed to establish a simple paper-based analytical method for OTC colorimetric detection. Based on the superiority of high sensitivity and selectivity, as well as good accuracy and biocompatibility, the GST-AuAgNCs were successfully applied for detecting OTC in cells.
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CARBON
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2022
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IF 11.307
Keke Kang,Limin Wang,Yajie Ma,Kai Yu,Jingwei Liu,Fengyu Qu,Huiming Lin
Here, Co 9 S 8 / [email protected] ( [email protected] ) nanocomposites are synthesized by a two-step hydrothermal process. Firstly, sulfur-doped carbon dots (S-CDs) are prepared by using 3-mercaptopropionic acid as a precursor. A region with denser –SH group is regarded as nucleation site on S-CDs for the growth of Co 9 S 8 to induce heterostructure. As-synthesized [email protected] possess great harvest in NIR region and hyperthermia (51.5%, 1064 nm) for photothermal (PTT). Besides, hyperthermia can elevate the thermal energy of nanocomposite to assist low-energy NIR-II irradiation (1064 nm, 1.16 eV), realizing the excitation of Co 9 S 8 (1.46 eV) and reactive oxygen species (ROS) generation for photodynamic therapy (PDT). What's more, [email protected] exhibits GOx-like activity that could consume glucose to elevate H 2 O 2 level and inhibit intracellular energy supply. In addition, they also show mimic peroxidase (POD) and catalase (CAT) characterization, and the tandem multi-nanozye activities endue the enhanced chemotherapy (CDT) and PDT. [email protected] reveals the greater ROS generation and nanozyme activity compared with pure Co 9 S 8 @PEG, attributing to the efficient charge separation in heterostructure. The novel biodegradation of [email protected] makes the elimination via feces and urine within 2 weeks. That is associated with PTT/PDT/CDT/starvation therapy to activate immune response for anticancer.
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JOURNAL OF BIOTECHNOLOGY
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2022
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IF 3.595
Feng Cheng,Wei-Bang Xie,Xiao-Fan Gao,Rong-Liang Chu,Shen-Yuan Xu,Ya-Jun Wang,Yu-Guo Zheng
( S )-2-chlorophenylglycine (( S )-CPG) is a key chiral intermediate for the synthesis of clopidogrel . Herein, a novel, efficient and environmentally friendly chemo-enzymatic route for the preparation of optically pure ( S )-CPG was developed. A straightforward chemical synthesis of the corresponding prochiral keto acid substrate (2-chlorophenyl)glyoxylic acid (CPGA) was developed with 91.7% yield, which was enantioselectively aminated by leucine dehydrogenase (LeuDH) to ( S )-CPG. Moreover, protein engineering of LeuDH was performed via directed evolution and semi-rational design. A beneficial variant Es LeuDH-F362L with enlarged substrate-binding pocket and increased hydrogen bond between K77 and substrate CPGA was constructed, which exhibited 2.1-fold enhanced specific activity but decreased thermal stability . Coupled with a glucose dehydrogenase from Bacillus megaterium ( Bm GDH) for NADH regeneration, Es LeuDH-F362L completely converted up to 0.5 M CPGA to ( S )-CPG in 8 h at 40 °C.
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PubMed
高影响因子
Nature Communications
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2022
·Vol. 13
·期 1
·1-17
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IF 17.694
Wang Xiaojuan,Xu Xiaoling,Zhang Shaojun,Chen Na,Sun Yunfeng,Ma Kuifen,Hong Dongsheng,Li Lu,Du Yongzhong,Lu Xiaoyang,Jiang Saiping
Tigecycline is regarded as the last line of defense to combat multidrug-resistant Klebsiella pneumoniae . However, increasing utilization has led to rising drug resistance and treatment failure. Here, we design a D-alpha tocopheryl polyethylene glycol succinate-modified and S-thanatin peptide-functionalized nanorods based on calcium phosphate nanoparticles for tigecycline delivery and pneumonia therapy caused by tigecycline-resistant Klebsiella pneumoniae . After incubation with bacteria, the fabricated nanorods can enhance tigecycline accumulation in bacteria via the inhibitory effect on efflux pumps exerted by D-alpha tocopheryl polyethylene glycol succinate and the targeting capacity of S-thanatin to bacteria. The synergistic antibacterial capacity between S-thanatin and tigecycline further enhances the antibacterial activity of nanorods, thus overcoming the tigecycline resistance of Klebsiella pneumoniae . After intravenous injection, nanorods significantly reduces the counts of white blood cells and neutrophils, decreases bacterial colonies, and ameliorates neutrophil infiltration events, thereby largely increasing the survival rate of mice with pneumonia. These findings may provide a therapeutic strategy for infections caused by drug-resistant bacteria.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Liruhua Zhang,Qianhong Shen,Feilong Huang,Libei Jiang,Jie Liu,Jiansong Sheng,Yue Li,Hui Yang
A novel 0D/1D CuBi 2 O 4 @WO 3 nanofiber-membrane photocatalyst with step-scheme (S-scheme) heterojunction was fabricated by means of the electrospinning method. The disintegration of CuBi 2 O 4 microspheres under a high voltage electrospinning process led to the simultaneous formation of CuBi 2 O 4 nanoparticles on WO 3 nanofibers, therefore constructing well dispersed CuBi 2 O 4 @WO 3 nano-heterojunctions. The CuBi 2 O 4 @WO 3 composite photocatalyst followed the S-scheme charge transfer mechanism, which promoted the efficient charge transfer across the interface, thereby solving the problem that the narrow-bandgap CuBi 2 O 4 had strong light-harvesting ability but easy recombination of photo-generated carriers. Moreover, such S-scheme heterojunction also achieved the spatial separation of photo-induced electrons and holes while ensuring the promising redox abilities in both WO 3 and CuBi 2 O 4 . Hence, the CuBi 2 O 4 @WO 3 composite photocatalyst exhibited excellent photocatalytic activity for photocatalytic degradation of antibiotics in environmental remediation under weak-visible-light irradiation (5 W LED lamp), and its photocatalytic activity for tetracycline degradation was significantly improved, which was 8.1 times and 3.6 times than that of WO 3 nanofibers and pure CuBi 2 O 4 microspheres, respectively. The radical species trapping tests indicated that·O 2 − and h + were the main active radicals in the tetracycline photodegradation reaction, and the high-performance liquid chromatography-mass spectrometry test clarified three possible degradation reaction pathways of tetracycline. This work presented a facile method to fabricate 0D/1D CuBi 2 O 4 @WO 3 composite nanofiber photocatalyst with well-dispersed CuBi 2 O 4 @WO 3 nano-heterojunctions, and also provided a new idea for the preparation of new nanocomposite photocatalyst based on electrospinning process.
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NANO
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2021
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IF 1.556
Mengting Zhang,Xiaorong Li,Hong Xiao,Bin Zhao,Wei Bian
Graphene quantum dots (GQDs) have been extensively used in biosensors and bioimaging. Heteroatom-doped GQDs can regulate material properties and endow them to improve structural and physicochemical properties. In this work, N,S-GQDs were prepared through a high-temperature pyrolysis method using L-cysteine and citric acid as the precursors. The morphology and structure of nanocomposites were identified by TEM, X-ray diffractometer (XRD), X-ray photoelectron spectrometer (XPS), and FTIR. The as-prepared N,S-GQDs show bright blue fluorescence with satisfactory fluorescence quantum yield. N,S-GQDs display significant response to riboflavin, achieving a low detection limit of 27 nM. The reaction of N,S-GQDs to riboflavin is mainly governed by static quenching. The detection of riboflavin in real samples has been performed to demonstrate its practical application. The obtained N,S-GQDs have low cytotoxicity and have been applied successfully in cell imaging.
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高影响因子
BIOMASS & BIOENERGY
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2022
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IF 5.774
Guojun Hao,Hongying Liu,Zhibing Chang,Kechen Song,Xin Yang,Han Ma,Wenjing Wang
In this work, lignin depolymerization was examined over CoMo sulfide catalysts supported on different carriers in supercritical ethanol system. The temperature, time, MoS 2 and carrier effects on the lignin depolymerization were investigated. 95.76% liquefaction yield with negligible char was achieved over Co–Mo–S/ZrO 2 at 340 °C for 150 min. The liquid product was mainly composed of C 4 –C 8 alcohols, C 4 –C 10 esters and C 7 –C 10 aromatic compounds . The synergistic effect of active sites and acid-base sites on support played an important role in lignin depolymerization. Furthermore, the Co–Mo–S/ZrO 2 catalyst is reusable with 8% loss in liquefaction yield after 5 cyclic runs. We believe that acid/base carriers or additives that can promote the medium to generate abundant free radicals or ions to replace external hydrogen pressure are one of the prospects for the design of depolymerization lignin catalysts.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Jiaqiang Wang,Donglin Yang,Bingxiao Feng,Meng Xiao,Hengjun Gai,Tingting Huang,Yu Zhou,Hongbing Song
Considering the environmental problems caused by oily wastewater, how to realize oil-water separation has attracted extensive attention from researchers. Herein, a series of hypercrosslinked poly(ionic liquid)s (HCPILs) were fabricated by using dimethoxymethane as an external crosslinking agent combined with different auxiliary crosslinking agents to “weave” the ionic liquid of 1,3-dibenzylimidazolium chloride for oil-water separation. The hydrophilicity and hydrophobicity of HCPL can be adjusted by changing different auxiliary crosslinking agents. When using aniline as an auxiliary crosslinking agent, the resulting HCPIL-A2 with approximately 5500 L/m 2 ·h of water flux exhibits super hydrophilicity-oleophobicity, its static water contact angle and underwater oil contact angle are close to 0° and 132°, respectively. When using benzyl alcohol instead of aniline, the obtained HCPIL-B2 exhibits good lipophilicity and hydrophobicity. Its static water contact angle and underwater oil contact angle are close to 126° and 0°, respectively. And its oil fluxes of chloroform and carbon tetrachloride are approximately 7645 and 7241 L/m 2 ·h, respectively. However, when using toluene instead of aniline, the obtained HCPIL-C2 exhibits hydrophilicity-lipophilicity and can’t separate the oil-water mixtures. Moreover, HCPILs show permanent pore structure, good stability, and environmental friendliness due to their high degree of crosslinking are constructed. Their loose surface roughness can realize the separation of the oil-water mixture by gravity. Therefore, the designed new materials can selectively remove water or oil mixture. Efficient separation of crude oil and seawater mixture will provide new ideas for future environmental problems such as offshore oil spills.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Xue Li,Shubo Wang,Hong Zhang,Cheng Lin,Xiaofeng Xie,Chenxing Hu,Ran Tian
Copoly (arylene ether sulfone)s was employed for proton exchange membrane preparation via atom transfer radical polymerization followed by mild sulfonation , enhanced phase-separated morphology and favorable proton conductivity were achieved. The comprehensive ex-situ properties of a range of membranes with different ion exchange capacities were characterized alongside the fuel cell performances investigation. The membranes exhibit higher water uptake, which is beneficial to the proton conduction, compared to Nafion® 211 while maintaining similar swelling ratio. The prepared membranes exhibit reasonably high proton conductivity (0.16 S/cm at 85 °C) benefitting from the well-defined microstructure and high connectivity of the hydrophilic domains. Considering the comprehensive property, membrane with moderate ion exchange capacity (1.39 mmol/g) was employed to fabricate the membrane electrode assembly and peak power density of 0.65 W/cm 2 at 80 °C, 60% relative humidity was achieved for a H 2 /O 2 fuel cell, these hydrocarbon membranes can therefore be implemented in PEMFCs.
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Journal of Energy Storage
·
2021
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IF 6.583
Jie Xu,Cuili Xiang,Songwen Fang,Luping Zhu,Fen Xu,Lixian Sun,Yongjin Zou,Jian Zhang
Supercapacitors, such as pseudocapacitors (PCs), are widely used because of their excellent electrochemical activity and capacitance; however, it is still challenging to fabricate PCs with high stability and good electrochemical properties. Therefore, suitable templates and transition metal composite materials should be selected for improving their performance. Binary transition metal sulfides exhibit excellent electrochemical performance owing to their rich valence, electrical conductivity, and abundant electrochemical active sites. In this study, we prepared porous Mn-Co-S nanospheres (MCSN) via the hydrothermal method using silica colloidal particles was as the template; to the best of our knowledge, this is the first study to synthesize MCSN. Results suggest that the MCSN composite exhibited excellent conductivity and enhanced stability owing to the porous structure formed by the vertical growth of MnS 2 -CoS 2 nanosheets on silica nanoparticles. The porous MCSN electrode showed an excellent specific capacitance of 1158 F g −1 at 1 A g −1 . Moreover, when coupled with an activated carbon (AC) positive electrode, the supercapacitor of MCSN//AC exhibited stability of 90.4% after 5000 cycles at 10 A g −1 (the specific energy of 34 W h kg −1 at 775 W kg −1 ). Given the results, we believe that the prepared MCSN material has potential application prospects for high-efficiency supercapacitors.
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