JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Guoping Pan,Jia Wei,Mengdie Xu,Jiamei Li,Linhao Wang,Yanan Li,Nan Cui,Jun Li,Zhaoxu Wang
In recent years, metal-free catalysts for persulfate-mediated oxidation processes have been widely applied to remove contaminants in the aquatic environment. Herein, a simple pyrolysis approach was used to synthesize the boron doped biochars (B@TBCs) derived from boric acid mixed with tea seed shells powders. The obtained B@TBCs exhibited fantastic capability to boost PMS (0.5 mM) activation for 90%∼ removal of oxytetracycline (OTC) within 20 min. Through the correlation analysis and DFT calculations, it was concluded that the apparent rate constant of pollutants removal was greatly related to the -O-B-O- groups on the biochars, which could improve the electron-donating capacity of the biochar. In addition, the degradation process of OTC was pH-dependent because of the changed roles of ROSs under different pH. Finally, according to the DFT calculation, LC-MS and toxicological analysis, the degradation pathways of pollutants and the toxicity changes during the degradation process were obtained. These findings consolidated the theoretical basis for further boosting the catalytic activity of B-doped biochars and expanded the imagination for the modification of other metal-free biochar catalysts for PMS activation .
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Jialiang Kang,Xueting Wang,Xiaoxiang He,Cun Lv,Caixia He,Zhanxiong Li
In this study, the perfluoropolyether carboxylic acid (PFPE-COOH) was used to react with polycaprolactone (PCL) to synthesise the hydrophobic block copolymer PCL- b -PFPE. The esterification reaction was performed successfully with the terminated hydroxyl group in the PCL-OH after activation of PFPE-COOH with N, N′ -dicyclohexyl carbon diimide. The PCL- b -PFPE was dissolved in various solvents to prepare microspheres using electrostatic spraying technology, and the flow rate, voltage, temperature and humidity parameters were optimised. The findings demonstrated that the solvent and ambient humidity had a substantial influence on the microspheres' surface morphology . Through smooth surface morphology, chloroform (CF) single solvent formed an ideal microsphere and DMF/CF mixed solvent produced a ‘pit’ surface morphology. Furthermore, the surface roughness of microspheres increases with an increase in humidity. The static contact angles of electrostatic spraying polyester fabric were 147.1° ± 1.8°, 150.9° ± 1.5°, 156.3° ± 2.6° and 155.9° ± 3.3°, under 20 %, 40 %, 60 % and 80 % humidity, respectively. The findings demonstrated that during the electrostatic spraying, the PFPE chain's introduction into PCL helped construct the secondary rough morphology on the microsphere surface and substantially enhanced the hydrophobicity of coatings, providing the finished polyester fabric super-hydrophobicity. The PCL-b-PFPE microspheres were directly sprayed and coated with the developed spray solution via electrostatic spraying. The water contact angle of the finished polyester fabric was found to be ≥140°, which provided hydrophobicity after 5 cycles of laundry. Following the sandpaper abrasion and adhesion tests, the contact angle of the fabrics coated with the microspheres remained ≥145°, indicating a good mechanical stability.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2023
·
IF 6
Shiqi Hu,Guanghong Zhou,Xinglian Xu,Wangang Zhang,Chunbao Li
To produce the high quality products and improve the stability of Jinhua hams, the activities of cathepsins and their correlation with processing parameters were explored. The effect of heat treatment on the structure of cathepsin B, together with potential of hydrogen and NaCl concentration, were investigated. At 45 °C, the activity of cathepsin B was maximum and it decreased rapidly at high temperature. The decrease on sulfhydryl group content indicated that the enzyme activity varied due to the breaking of disulfide bond in molecule. Infrared spectroscopy indicated that the secondary structure of cathepsin B had altered. Meanwhile, the root mean squared deviation and the root mean square fluctuation curves reflected that the cathepsin B vitality was in a decline under high temperature. In addition, in the presence of 0.6 mol ⋅ L −1 NaCl, lots of conformational changes were evidenced. Under acidic conditions (pH = 6), there were more formed hydrogen bonds, and the hydrogen bonding interactions became stronger. Simulation results contributed to providing an important theoretical basis for understanding the roles of processing parameters on the quality control of Jinhua ham.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Junyao Li,Yu Wang,Yiying Yue
The opacity, fragility, and environmental unfriendliness of the traditional photocatalytic matrix cannot fully utilize the properties of photocatalysts and efficiently degrade pollutants. In this work, a transparent wood hydrogel with a core–shell structure was developed using transparent wood (TW) impregnated with polyacrylic acid (PAA) as the core layer and Bi-N-carbon dots/BiOBr (Bi-N-CDs/BiOBr) photocatalyst-initiated polymerization of acrylic acid (AA) monomers as the shell layer. In the shell layer, nanoscale CDs with rich hydrophilic groups built a link between BiOBr and PAA and strengthened the adsorption–photocatalysis synergistic removal for RhB. The original wood backbone well conserved during preparation led to an anisotropic structure in the resultant Bi-N-CDs/BiOBr@TW photocatalytic wood hydrogel. Namely, after introducing Bi-N-CDs/BiOBr as the linker and reinforcing agent, the tensile strength was up to 3.2 and 11.03 MPa along the radial (R-) and axial (A-) directions, which was 1.6- and 1.06-fold of R-TW and A-TW, respectively. Hence, Bi-N-CDs/BiOBr@TW with high strength furnishes multiple separations and reutilizations, and the RhB removal rate is approximately 85% after five cycles. The Bi-N-CDs/BiOBr@TW exhibited light transmittance up to 64.6 and 52.3% at 800 nm along the R- and A-directions, respectively. Moreover, the adsorption–photocatalysis synergistic rate of Bi-N-CDs/BiOBr@TW reached 93% in 300 min at pH = 7. This paper offers a strategy for fabricating wood hydrogels with outstanding stretchability, transparency, dye removal efficiency, and recyclability, opening a significant route for alleviating dye pollution.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
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IF 6.2
Zhitong Xu,Ye Qi,Yueguang Fang,Peng Tian,Guiling Ning,Junwei Ye
Core-shell Fe 3 O 4 @UiO-66-NH 2 nanospheres with superior photocatalytic activity and photo-Fenton performance were synthesized using a layer-by-layer growth strategy. The synthesis involved the use of FeCl 3 , trisodium citrate, sodium acetate, ZrCl 4 , and 2-aminoterephthalic acid as raw materials, with mercaptoacetic acid serving as a modifier. Fe 3 O 4 @UiO-66-NH 2 demonstrated improved visible-light-driven photocatalytic performance in the oxidation degradation of Rhodamine B (RhB) in the presence of trace amounts of H 2 O 2 under visible light irradiation. The Fe(II)/Fe(III) cycle was accelerated by the transfer of the photogenerated electrons (e-) from UiO-66-NH 2 to Fe 3 O 4 , which in turn encouraged the Fenton reaction to produce hydroxyl radicals (•OH). With only 10 mmol/L H 2 O 2 , the removal rate of RhB approached 94% in 120 min. Furthermore, when exposed to visible light, Fe 3 O 4 @UiO-66-NH 2 exhibited 99% efficacious antibacterial activity against Escherichia coli and Staphylococcus aureus . Overall, the as-prepared Fe 3 O 4 @UiO-66-NH 2 core-shell nanospheres show promise for practical applications as photocatalysts for the degradation of organic pollutants and the inactivation of bacteria in wastewater.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Hongxing Chen,Renquan Wang,Jun Li,Chang Liu,Xiaojiao Yang,Ying Liu
The combination of high coercivity and resistivity is a strong requirement for permanent magnets to resist thermal demagnetization under complex operating conditions. However, this still remains a challenge for conventional strategies, which always sacrifice the maximum energy product as the coercivity or resistivity increases. In this work, we report a unique strategy of introducing only 0.1 wt% of insulating nano-diamonds (NDs) into the hot-deformed Nd-Fe-B magnets to significantly and simultaneously improve both magnetic properties ( H ci , B r , (BH) max and H k / H cj ) and resistivity. In particular, the coercivity increased by 60% from 746 to 1193 kA/m. Further microstructure observations indicate that this exceptional effect stems from NDs can effectively inhibit the formation of coarse grains and optimize the distribution of Nd-rich phases, ensuring a strong pinning effect to enhance hard magnetic performance. Meanwhile, the presence of additional grain boundaries and NDs can also lead to higher resistivity by preventing the movement of free electrons. Our work provides a distinctive strategy for interface modification with excellent comprehensive performance in permanent magnets.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Saif Ullah,Rooh Ullah,Rasha M.K. Mohamed,Gang Hu,Ateeq ur rehman,Muhammad Yasir Nawabi,Asif Hayat,Ata Ur Rehman,Mehboob Hassan,Ikram Uddin,Syed Attaullah Shah,Muhammad Zahir Shah,Jimei Song
An appropriate analytical technique for determination of kaempferol (KMF) by its perturbation effect on Belousov-Zhabotinskii (B-Z) oscillating system was reported. The macrocyclic copper (II) complex [CuL] (ClO 4 ) 2 ] was used as a catalyst while malic acid as substrate in B-Z system. The ligand L in the macrocyclic-complex is 5, 7, 7, 12, 14, 14-hexamethyl-1, 4, 8, 11-tetraazacyclotetradeca-4, 11-diene. Experimental outcomes shown the perturbation effect of KMF could cause the change in the amplitude of oscillation (ΔA) which was directly related to its concentration (2.5 × 10 -6 to 3.0 × 10 -4 mol/L) with correlation coefficient of 0.99315. The calculated relative standard deviation (RSD) is 3.1 % by eight samples (1.8 × 10 -5 mol/L) and the observed lower limit of detection is 1.25 × 10 -6 mol/L. The cyclic voltammetry (CV) experiments were used to confirm the redox reaction between kaempferol and sodium bromate. Furthermore, the reaction perturbation mechanism was derived from the well-known FKN (Field-Koros-Noyes) oscillation mechanism.
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Frontiers in Environmental Science
·
2022
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IF 5.411
Feng Shuna,Yan Zheng,Ni Qianqian,Zhang Yun
As a primary goal, The fast recombination of stimulated excitons and poor visible light response are key problems in the photocatalysis field. Combining with materials with good visible light responses to form heterogeneous structures is still the most effective way. In this study, BiOBr/UiO-66-NH2 photocatalyst was synthesized by a simple method. BiOBr is a 3D spherical structure stacked by nanosheets, which enhance its adsorption capacity for pollutants and catalyze the dark reaction to reach the equilibrium point for too long. Coupling with UiO-66-NH2, its adsorption capacity was inhibited and the dark reaction time was shortened. The excellent removal rate of Rhodamine B (RhB) by BiOBr/UiO-66-NH2 reached 96.79% after 30 min of visible light irradiation and 99.37% after 90 min. With an increase in pollutant concentration, the composite still showed excellent photocatalytic performance. This study also tried to abandon the dark adsorption stage and directly degraded RhB efficiently and quickly under visible light. Finally, the photocatalytic enhancement mechanism was proposed.
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Frontiers in Microbiology
·
2022
·
IF 6.064
Gao Haijun,Huo Lele,Mo Xiaojin,Jiang Bin,Luo Yanping,Xu Bin,Li Jingzhong,Ma Xingming,Jing Tao,Feng Zheng,Zhang Ting,Hu Wei
Echinococcus multilocularis, the causative agent of alveolar echinococcosis (AE), severely threats human health and livestock farming. The first line of chemotherapeutic drug for AE is albendazole, which limits rapid extension of E. multilocularis metacestodes, but is rarely curative for AE, with severe side effects in long-term use, thus development of new anti-echinococcal drugs is mandated. Pseudolaric acid B (PAB) has long been used to treat fungal-infected dermatosis, and exerted anti-tumor, -fertility, -angiogenesis, -tubulin and antiparasitic activity. However, the effect of PAB against Echinococcus spp. remains unclear. The present study is to understand the effect of PAB against E. multilocularis in vitro and in vivo, and identify potential anti-echinococcal mechanism, as well as its toxicity. After exposure to PAB at 20 μg/ml, significant reduction of the survival rate and substantial ultrastructural destructions in E. multilocularis protoscoleces were observed in vitro. Furthermore, the wet weight of E. multilocularis cysts in the infected mice was significantly decreased after treatment with PAB (40, 20 or 10 mg/kg) for 12 weeks. Meanwhile, significant increase of both protein and mRNA expression of transforming growth factor beta 1 (TGF-β1) was detected in the serum and liver of the infected mice, whereas PAB administration lowered its expression significantly. The toxicity tests demonstrated that PAB displayed lower cytotoxicity to human liver and kidney cells (HL-7702 and HK-2 cell) with IC50 = 25.29 and 42.94 μg/ml than albendazole with IC50 = 3.71 and 21.22 μg/ml in vitro, and caused lower hepatoxicity and nephrotoxicity in mice than ABZ. Our findings indicated that PAB possesses potent anti-echinococcal effect, with lower toxicity than albendazole, implying a potential chemotherapeutic agent for AE. Additionally, the present study demonstrated that the suppressive effect of PAB on the parasite may involve down-regulation of TGF-β1 signaling.
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JOURNAL OF BIOMATERIALS APPLICATIONS
·
2022
·
IF 2.712
QingXia Guan,XiaoYing Zhou,FangFang Yang,Xue Zhang,YanHong Wang,WeiNan Li,XiuYan Li
It is well known that Glycyrrhetnic acid (GA) has significant liver-targeting and anti-inflammatory effects. Syringopicroside (SYR) and Hydroxytyrosol (HT), the active components of the Chinese herb Syringa oblata Lindl, have earned great reputation for their potential in preventing or treating viral hepatitis type B. Therefore, we loaded SYR and HT into GA-conjugated PEG-PLGA, so that they could target the liver in additional to exerting their own pharmacological effects in a synergistic. However, the in vivo targeting and the low bioavailability of SYR and HT pose a huge challenge. Therefore, we synthesized GA-conjugated multi-component nano-drug delivery system (SH-GPP). SH-GPP had a regular spherical shape with a uniform size distribution of 110.5 ± 3.18 nm. We further evaluated the effects of SH-GPP in vitro and in vivo. In the in vivo experiment, we evaluated the following parameters: the serum ALT and AST values; liver tissue homogenate MDA and SOD; HE staining of the pathological liver sections; and the liver coefficient. In the in vitro studies, the following parameters were evaluated: cellular uptake of SH-GPP; wound healing/scratch assay; cellular apoptosis; cell cycle; HBsAg; and HBeAg content. SH-GPP had better anti-hepatitis B effect than Syringopicroside and hydroxytyrosol (SH) and NPP alone. The targeting ability of GA enabled HT and SYR in GPP to reach the liver accurately, and played a synergistic role to maximize their therapeutic effects. This study provides a novel strategy against hepatitis B virus, and also provides a feasible scheme for improving the low bioavailability of the active components of traditional Chinese medicine.
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Journal of Water Process Engineering
·
2022
·
IF 7.34
Lixian Zhao,Yabing Sun,Rui Qiu,Hao Sun,Jingwei Feng
In the present work, the degradation pathways and mechanism of rhodamine B (RhB) using a novel liquid film dielectric barrier discharge (DBD) plasma reactor were examined. Moreover, the optimization of the performance of DBD was discussed. The results showed that the atmosphere of the discharge area and the input power had a significant effect on the removal of RhB. After 21 min of treatment using DBD plasma system, about 90.2 % of RhB was degraded under the following experimental conditions: initial RhB concentration of 40 mg/L; input power of 125 W and initial pH of 6.78. The use of free radical scavengers proved that hydroxyl radicals played a key role in the degradation of RhB. In addition, the degradation intermediates of RhB were identified using liquid chromatography mass spectrometry, and possible degradation pathways were proposed. During the degradation of RhB, with the extension of treatment time, the values of COD , BOD 5 and TOC decreased. After the treatment using DBD plasma, the BOD 5 /COD of RhB solution increased from 0.0326 to 0.3867, and the biodegradability was also observed to have greatly improved. The potential toxicity was predicted by US-EPA-TEST software.
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RSC Advances
·
2022
·Vol. 12
·期 45
·28867-28877
·
IF 4.036
Shuqiong Liu,Zhenyi Xu,Jiapeng Hu,Zhenzeng Wu,Yuying Zheng
Biomimetic scaffolds loaded with drugs can improve the osteogenesis and neovascularisation of scaffolds. A series of PLA/GO/Sal-B drug-loaded scaffolds was prepared by thermally induced phase separation. The addition of Sal-B increased the diameter of the fibres, but the scaffold showed a porous nanofibrous structure after drug release. X-ray diffraction results showed that the addition of Sal-B did not affect the formation of the nanofibre biomimetic structure of the scaffold. FTIR results indicated a certain interaction between Sal-B and PLA/GO. Water absorption and porosity test results revealed that the scaffolds had good hydrophilicity and appropriate porosity. The addition of Sal-B was also conducive to the formation of sediments possibly due to the good water solubility of Sal-B itself. The prepared scaffolds had good blood compatibility and cytocompatibility, and a small additional amount of Sal-B could significantly promote cell proliferation and alkaline phosphatase activity. Their sustained release performance indicated that the biomimetic scaffolds had controlled the release of Sal-B. The kinetic model showed that the PLA/GO/Sal-B drug-loaded biomimetic scaffolds followed the diffusion mechanism.
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危险品化学品经营许可证（带存储）