BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2019
·Vol. 102
·期 6
·789-794
·
IF 1.65
Yi Xianliang,Yu Mingyue,Li Zhaochuan,Chi Tongtong,Jing Siyuan,Zhang Keke,Li Wentao,Wu Minghuo
Marine organisms are often exposed to a mixture of various pollutants in marine environment (i.e., nanoparticles, organic pollutants). The present study investigated the potential effects of multi-walled carbon nanotubes (MWCNTs) on the toxicity of triphenyltin chloride (TPTCl). The results revealed an antagonistic interaction between MWCNTs and TPTCl on the copepod through 96 h acute exposure, which was attributed to the adsorption of TPTCl to MWCNTs and aggregation of MWCNTs in the test solutions. Results of 21 days’ chronic exposure showed that the effect concentration of MWCNTs could be 100 times lower than that of acute exposure. The exposure to binary mixture of MWCNT (1.0 mg/L) and TPTCl (0.3 µg/L) caused a reduction by 94% for the 3rd time spawning and 83% for the total number of hatched nauplii. The ingestion and exterior attachment of MWCNTs to the copepod might be the main reasons causing the adverse effect in reproduction.
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RHEOLOGICA ACTA
·
2022
·Vol. 61
·期 3
·229-242
·
IF 2.824
Stadler Florian J.,Cui Shuming,Hashmi Saud,Handschuh-Wang Stephan,Li Wenqiang,Wang Shichang,Yan Zhi-Chao,Zhu Guangming
In the last years, the 3iTT protocol—a dynamic-mechanical test (DMT) at low deformation and constant frequency, followed by a start-up flow (SUF) at constant shear-rate, and a DMT—was developed as an alternative to check for changes in material behavior, which was extended to form the multiple interval thixotropic test protocol (miTT), differing in modifying the shear rates systematically. The results of this test routine are a viscosity function η( \(\dot{\gamma }\) ) with increasing and decreasing \(\dot{\gamma }\) and the dependence of G’ and G” on \(\dot{\gamma }\) previous test . More importantly, the G’ and G” are strongly influenced by the previously applied shear rate. While regular emulsions show a decrease of G’ and G” upon a higher shear rate \(\dot{\gamma }\) in the previous shear step, the pickering emulsions with graphene oxide show an increase. In both cases, the change is approximately reversible. The changes in G’ and G” correlate well with the emulgel composition.
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COLLOID AND POLYMER SCIENCE
·
2022
·Vol. 300
·期 9
·1075-1086
·
IF 2.434
Zhao Jing,Cui Lu,Wang Xiaoran,Deng Chunyu
Thermosensitive hydrogels based on chitosan play an important role in the field of tissue engineering and drug delivery system, with excellent properties such as biocompatible, biodegradable, and minimally invasive. In this work, a dual ionically crosslinked injectable hydrogel was composed of polyelectrolyte complex (PEC) and sodium hydrogen carbonate (SHC) as non-toxic gel agent. The PEC was prepared by ionic interaction between positively charged chitosan and negatively charged thermosensitive polymer poly(NIPAm-co-AMPS). The injectable hydrogel with rapid gelation was obtained by optimizing feed ratio, SHC amount, concentration, and temperature. The swelling, temperature sensitive, rheological, and cytotoxic properties of the hydrogels were evaluated. The potential of hydrogels applied in drug delivery system was studied by measuring the release property in vitro, taking aspirin as drug model. The results showed that the hydrogel exhibited a sol–gel transition at about 37 ℃, when the volume ratio of CS (20 mg/mL), PNAM (4.0 mg/mL), and SHC (0.4 M) was 1:0.2:0.5; the hydrogel with good mechanical strength and gelation time of 1–3 min in the physiological conditions was obtained. The hydrogels prepared with high SHC concentration or more gel agents showed shorter gelation time and better thermostability. The hydrogel presented a 1-day sustained release of aspirin with no significant burst release in vitro. The release properties demonstrated that the hydrogels released aspirin in a sustained manner, about 87% in 24 h. L929 cells had good survival and proliferative rates within CS-PNAM/SHC hydrogel after 24 h, showing excellent biocompatibility. Therefore, the injectable thermos-responsive hydrogels formed by CS-PNAM/SHC and loaded with aspirin turned into a smart drug delivery system, showing great potential for controlled release.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-8
·
IF 17.694
Zhou Xian,Gao Xiaofeng,Liu Mingjie,Gao Zirui,Qin Xuetao,Xu Wenhao,Ye Shitong,Zhou Wenhua,Fan Haoan,Li Jing,Fan Shurui,Yang Lei,Fu Jie,Xiao Dequan,Lin Lili,Ma Ding,Yao Siyu
The coupling of acetonitrile into succinonitrile, an important terminal dinitrile for value-added nylon production, via a dehydrogenative route is highly attractive, as it combines the valuable chemical synthesis with the production of green hydrogen energy. Here, we demonstrate that it is possible to achieve a highly selective light driven dehydrogenative coupling of acetonitrile molecules to synthesize succinonitrile using anatase TiO 2 based photocatalysts in aqueous medium under mild conditions. Under optimized conditions, the formation rate of succinonitrile reaches 6.55 mmol/(g cat *h), with over 97.5% selectivity to target product. Mechanism studies reveal that water acts as cocatalyst in the reaction. The excited hole of anatase semiconductor oxidizes water forming hydroxyl radical, which subsequently assists the cleavage of sp 3 C-H bond of acetonitrile to generate ·CH 2 CN radical for further C-C coupling. The synergy between TiO 2 and Pt cocatalyst is important to enhance the succinonitrile selectivity and prevent undesirable over-oxidation and hydrolysis. This work offers an alternative route to prepare succinonitrile based on renewable energy under mild conditions and avoid the use of toxic reagents and stoichiometric oxidative radical initiators.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2014
·Vol. 30
·期 3
·356-361
·
IF 1.119
Han Pengfei,Yuan Changfu,Xu Junyi,Liu Jin
We reported a dripping solvothermal method for synthesizing metal-organic framework-5(MOF-5). It started from separately dissolving Zn(NO 3 ) 2 and terephthalic acid(H 2 BDC) in dimethyl formamide(DMF), and then dripping one solution into the other. Results of SEM, XRD and laser particle size distribution show that regular cubic-shaped and micro-crystallite powder of MOF-5 can be obtained. The d
0.5 (volume-median-diameter) values are 4.32 μm for particles prepared by dripping Zn(NO 3 ) 2 into H 2 BDC(ZH) and 9.32 μm for those prepared by dripping H 2 BDC into Zn(NO 3 ) 2 (HZ), much smaller than 22.7 μm that of particles prepared by the traditional adding water solvothermal method(L). The standard deviations of the particle size distributions fitted by the GaussAmp model are 2.49, 4.38 and 15.4 respectively for ZH, HZ and L, further revealing narrower size distributions of particles prepared by the dripping method. In addition, the Langmuir specific surface areas are 923 m 2 /g for ZH and 868 m 2 /g for HZ. The TGA results present mass losses of 4.18% and 3.62% at 105 °C, 17.19% and 14.78% at 245 °C, 39.04% and 34.85% at 600 °C separately for ZH and HZ, which correspond to the removal of H 2 O, DMF and the decomposition of MOF-5. This indicates that MOF-5 has a strong adsorption ability for small molecules. Besides, the mass loss of 48.39%(ZH) and 41.02%(HZ) between 400 °C and 600 °C are less than the theoretical value of 57.81% for MOF-5 decomposition to ZnO, suggesting that an impure phase with an extra amount of ZnO may exist in the cavities of MOF-5.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 11
·1-10
·
IF 2.8
Han Linting,Yang Xiaofeng,Wang Hui,Chen Zhiping,Jing Hongxia,Zhang Lixin
As one of the most promising solid electrolytes, Li 7 La 3 Zr 2 O 12 (LLZO) has received great attention in the field of all solid-state lithium-ion batteries. However, LLZO, as a solid material, has far less contact with the electrode than original liquid electrolyte with wettable properties in practical applications. In this study, porous LLZO solid electrolytes were fabricated by both mechanical and dispersive mixing methods with modified kapok fibers as pore-forming agents. The results show that the pores of LLZO prepared by dispersive mixing are more homogeneous than that prepared by mechanical mixing, and the ionic conductivity of LLZO fabricated by dispersive mixing remains in the same order of magnitude as the ionic conductivity of the original LLZO solid electrolyte. At the same time, the formation of ordered pore channels for porous LLZO is conducive to increasing the contact area between the solid electrolyte and the electrode material, which lays a foundation for reducing the impedance of solid electrolyte.
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Microsystems & Nanoengineering
·
2023
·Vol. 9
·期 1
·1-10
·
IF 7.9
Li Guanglei,Chen Yao,Liu Fei,Bi Wenhua,Wang Chenxin,Lu Danfeng,Wen Dan
It is important to monitor the intra-/extracellular concentration of hydrogen peroxide (H 2 O 2 ) in biological processes. However, miniaturized devices that enable portable and accurate H 2 O 2 measurement are still in their infancy because of the difficulty of developing facile sensing strategies and highly integrated sensing devices. In this work, portable H 2 O 2 sensors based on Pt-Ni hydrogels with excellent peroxidase-like and electrocatalytic activities are demonstrated. Thus, simple and sensitive H 2 O 2 sensing is achieved through both colorimetric and electrochemical strategies. The as-fabricated H 2 O 2 sensing chips exhibit favorable performance, with low detection limits (0.030 μM & 0.15 μM), wide linearity ranges (0.10 μM–10.0 mM & 0.50 μM–5.0 mM), outstanding long-term stability (up to 60 days), and excellent selectivity. With the aid of an M5stack development board, portable visual and electrochemical H 2 O 2 sensors are successfully constructed without complicated and expensive equipment or professional operators. When applied to the detection of H 2 O 2 released from HeLa cells, the results obtained by the developed sensors are in good agreement with those from an ultraviolet‒visible spectrophotometer (UV‒vis) (1.97 μM vs. 2.08 μM) and electrochemical station (1.77 μM vs. 1.84 μM).
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Xu Jie,Xue Xiong-Xiong,Shao Gonglei,Jing Changfei,Dai Sheng,He Kun,Jia Peipei,Wang Shun,Yuan Yifei,Luo Jun,Lu Jun
The thriving field of atomic defect engineering towards advanced electrocatalysis relies on the critical role of electric field polarization at the atomic scale. While this is proposed theoretically, the spatial configuration, orientation, and correlation with specific catalytic properties of materials are yet to be understood. Here, by targeting monolayer MoS 2 rich in atomic defects, we pioneer the direct visualization of electric field polarization of such atomic defects by combining advanced electron microscopy with differential phase contrast technology. It is revealed that the asymmetric charge distribution caused by the polarization facilitates the adsorption of H*, which originally activates the atomic defect sites for catalytic hydrogen evolution reaction (HER). Then, it has been experimentally proven that atomic-level polarization in electric fields can enhance catalytic HER activity. This work bridges the long-existing gap between the atomic defects and advanced electrocatalysis by directly revealing the angstrom-scale electric field polarization and correlating it with the as-tuned catalytic properties of materials; the methodology proposed here could also inspire future studies focusing on catalytic mechanism understanding and structure-property-performance relationship.
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CELLULOSE
·
2023
·
IF 5.7
Wang Lili,Zhao Xiaomin,Li Hao,Wu Minghua
Natural antibacterial agents exhibit tremendous potential in fabricating the durable antibacterial fabrics. Herein, natural pterostilbene (PL) was grafted onto chitosan (CS) through a Mannich reaction to obtain PLCS with high antibacterial activity. Furthermore, the durable antibacterial cotton fabric was fabricated using a layer-by-layer assembled coating with PLCS as the antibacterial agent. The results showed that at a molar ratio of PL to CS of 0.2:1 and a temperature of 80 ℃, PLCS with a grafting ratio of 17.3% achieved the lowest minimum inhibitory concentrations of 33.2 and 16.6 µg/mL against Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ), respectively. Compared to those of CS and PL alone, the antibacterial activity of PLCS against S. aureus improved by 67.0% and 58.5%, while the activity against E. coli improved by 94.8% and 44.7%, respectively. The antibacterial rate of the PLCS cotton fabric against S. aureus and E. coli reached up to 99.9% after three assembled layers and maintained more than 80% after 20 washings. The PLCS antibacterial fabrics exhibited good wearing safety and wearing performances.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·
IF 1.6
Fan Zheyu,Cheng Xiankui,Sheng Guodong
The combination of metal − organic frameworks (MOFs) and magnetic nanoparticles has been demonstrated their prospective for sequestration of heavy metal or radionuclides. In this work, five kinds of magnetic metal − organic framework including ZIF-67@Fe 3 O 4 , ZIF-8@Fe 3 O 4 , CuBTC@Fe 3 O 4 , MIL101(Fe)@Fe 3 O 4 , and MOF74@Fe 3 O 4 , was prepared and used as novel highly-efficient scavengers for the capture of U(VI) from aqueous environment. These magnetic nanocomposites before and/or after U(VI) capture were characterized by FTIR, SEM–EDS, XRD, TEM, BET, and XPS analyses. A batch technique was applied for the capture of U(VI) using these magnetic nanocomposites at different operating parameters. The isotherm and kinetic data were more accurately fitted by the Langmuir and pseudo-second-order models, respectively. The ZIF-8@Fe 3 O 4 and ZIF-67@Fe 3 O 4 exhibit the potential to capture U(VI) from aqueous solutions with a maximum monolayer adsorption capacity of 441 and 1058 mg/g –1 , respectively, by fitting the equilibrium data to the Langmuir model. The excellent adsorption capacity and the response to the magnetic field made these novel nanocomposites auspicious candidates in nuclear waste management.
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WATER AIR AND SOIL POLLUTION
·
2026
·Vol. 237
·期 22
·1293
·
IF 3.5
Li Xi,Zhang Luyao,Liu Ling,Yan Yunxia,Wang Ziqing,Wang Bing
Soil co-contamination by organic pollutants and toxic metals has become an increasingly prominent environmental concern worldwide, largely driven by intensive industrial and anthropogenic activities. In this study, BC-nZVI coupled with three oxidants—persulfate (PS), BS, and hydrogen peroxide (HP)—was evaluated for the simultaneous remediation of BaP and Cr(VI) co-contaminated soil. Among the tested systems, BC-nZVI/BS exhibited the best overall performance, achieving 77.7% BaP removal and 97.6% Cr(VI) reduction, followed by BC-nZVI/HP and BC-nZVI/PS. Among the three systems, the BC-nZVI/BS system maintained comparatively stable remediation performance over the tested pH range. Coexisting Cr(VI) exerted a pronounced synergistic effect on BaP degradation in the BC-nZVI/BS system, likely via promoting oxidant activation. Six classes of intermediates with simpler structures than BaP were tentatively identified, indicating the progressive transformation of BaP during the remediation process. Post-treatment characterization revealed the presence of Cr 2 O 3 , FeCr 2 O 4 , and Cr(OH) 3 , suggesting that Cr(VI) was predominantly removed through reductive precipitation to Cr(OH) 3 . Overall, the BC-nZVI/BS system showed promising potential for the remediation of BaP-Cr(VI) co-contaminated soils.
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Nature Communications
·
2026
·
IF 18.1
Zhou Juemou,Zhang Fumiao,Wang Chen-Ma,Ouyang Ting,Xing Mingming,Cui Xiaoli,Ma Danting,Liu Chunguang,Shi Xiaofeng,Hu Bojie,Zhang Shuli,Zhang Yuqi,Zhang Weiping J.,Xie Xiangyang
Feeding is regulated not solely by intrinsic energy demands, but also by various environmental cues. Food sight and odor are two essential food-related cues that promote human eating; nonetheless, the underlying neural mechanisms remain unknown. Here, we show that during energy deficit, food sight inhibits the ventromedial hypothalamus (VMH) neuronal activity, thereby promoting feeding and food-associated contextual memory in mice. VMH neurons receive direct GABAergic input from the suprachiasmatic nucleus (SCN) that is rapidly activated by food sight. Either knockout of VMH RuvB-like 2 (RUVBL2) or inhibition of RUVBL2-expressing neurons in the VMH (VMH RUVBL2 ) promotes feeding and food-associated contextual memory. Interestingly, VMH RUVBL2 neurons exert these effects by sequentially projecting to the supramammillary nucleus (SuM) and the hippocampal dentate gyrus (DG). Together, this study identifies SCN GABA → VMH RUVBL2 → SuM→DG neural circuit underlying food sight-promoted feeding and food-associated contextual memory in mice.
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