JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Shenghui Xie,Jiaxin Su,Jianxin Zhao,Haipeng Yang,Haixia Qian
Glassy zero-valent iron (GZVI) is one of the potential Fenton-like catalysts due to its amorphous nature and high energy state, but the catalytic activity still needs to be further enhanced, especially using low-cost technology suitable for industrialization. In this paper, Fe 3 O 4 particles were embedded into the surface of Fe 91.9 Si 5.3 B 2.8 amorphous powder through a conventional low-cost ball milling technique, which endowed Fe 3 O 4 /GZVI with improved catalytic activity. GZVI attained the best surface morphology and the highest catalytic efficiency (3 times as high as pure GZVI) at a 10 % Fe 3 O 4 addition. The Fe 3 O 4 -decorated catalysts could decompose p-nitrophenol by 97.37 % within 15 min and exhibited good stability and reusability within seven cycles. The galvanic cell formed between Fe 3 O 4 and GZVI because their large OCP gap was responsible for the improved catalytic activity, which promoted electron transfer and •OH generation. The faster electron mobility accelerated the oxidation of Fe 2+ and Fe 0 and the reduction of Fe 3+ on the catalyst surface with the aid of H 2 O 2 , thus promoting the pollutant degradation process. The amount and distribution of Fe 3 O 4 particles and the bonding state between Fe 3 O 4 and GZVI markedly influence the degradation reaction and reusability. Fe 3 O 4 /GZVI is a promising heterogeneous Fenton-like catalyst with low-cost and large-scale engineering application prospects.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2022
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IF 5.141
Xiufeng Wang,Yunyun Zhang,Yao Jin,Siqi Wang,Zhiqing Zhang,Ting Zhou,Guodong Zhang,Fang Wang
Quantum dots (QDs) are excellent fluorescent indicators for chemical and biological analysis. In this paper, an Off-Off fluorescence sensor based on ZnS quantum dots was designed. It was found that Co 2+ can quench the fluorescence of ZnS QDs, moreover glutathione (GSH) can further quench the fluorescence. Therefore, this method can be used for indirect detection of GSH. However, if change Co 2+ into other metal ions, the system cannot be used to detect GSH indirectly. For direct detection GSH, that is adding GSH without Co 2+ , the fluorescence intensity changes little, while only amino acid or monosaccharide has no effect. When indirect detection of GSH based on this Off-Off fluorescent probe, the fluorescence quenching was linearly related to the concentration range of 1–300 μM GSH, and the detection limit could reach 0.48 μM, which can rival most Off-On and On-Off fluorescent probe. The relative standard deviation for parallel measurement of 300 μmol·L -1 GSH solution (for n = 10) was 1.43 %.
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
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IF 6.76
Zhiwen Xu,Zhiyuan Liang,Huaishuang Shao,Qinxin Zhao
The dioxins and leachable heavy metals in municipal solid waste incineration (MSWI) fly ash made it a hazardous waste. Microwave hydrothermal with four common additives, Na 2 S, Na 2 SiO 3 , Na 2 B 4 O 7 or H 3 BO 3 , was researched at different temperatures, L/S ratios, time and additive concentrations by single factor and orthogonal methods to achieve effective heavy metal stabilization and waste reuse of MSWI fly ash. The samples were investigated by XRD, BET, SEM, ICP-MS to determine the influence of additive-assisted microwave hydrothermal on heavy metals stabilizing. According to the results of the orthogonal study, the degree of influence of each parameter heavy metals stabilization was in the order of additive, temperature, additive concentration, time and L/S ratio. Single-factor experiments suggested that the conditions of 125 °C, 10 min, 3 mol/L Na 2 S and 2 mL/g were enough for the leaching concentration of heavy metals meeting the specified limitation of China. The results of analyses confirmed that microwave hydrothermal treatment with Na 2 S could enhance heavy metals stabilizing by forming zeolites for adsorption, precipitation and convert heavy metals to a more stable state. Microwave hydrothermal with Na 2 S was a promising method to manage MSWI fly ash, which greatly decrease the reaction time and realize wastes utilization.
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高影响因子
Foods
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2022
·Vol. 11
·期 21
·3407
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IF 5.561
Hao Wang,Lu Chen,Min Li,Yongxin She,Chao Zhu,Mengmeng Yan
Avoiding interference and realizing the precise detection of mycotoxins in complex food samples is still an urgent problem for surface-enhanced Raman spectroscopy (SERS) analysis technology. Herein, a highly sensitive and specific aptasensor was developed for the anti-interference detection of Ochratoxin A (OTA). In this aptasensor, 4-[(Trimethylsilyl) ethynyl] aniline was employed as an anti-interference Raman reporter to prove a sharp Raman peak (1998 cm−1) in silent region, which could avoid the interference of food bio-molecules in 600–1800 cm−1. 4-TEAE and OTA-aptamer were assembled on Au NPs to serve as anti-interference SERS probes. Meanwhile, Fe3O4NPs, linked with complementary aptamer (cApts), were applied as capture probes. The specific binding of OTA to aptamer hindered the complementary binding of aptamer and cApt, which inhibited the binding of SERS probes and capture probes. Hence, the Raman responses at 1998 cm−1were negatively correlated with the OTA level. Under the optimum condition, the aptasensor presented a linear response for OTA detection in the range of 0.1–40 nM, with low detection limits of 30 pM. In addition, the aptasensor was successfully applied to quantify OTA in soybean, grape and milk samples. Accordingly, this anti-interference aptasensor could perform specific, sensitive and precise detection of OTA in real samples, and proved a reliable reference strategy for other small-molecules detection in food samples.Keywords:SERS;4-TEAE;aptamer;silent region;OTA;anti-interference
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PubMed
高影响因子
CURRENT EYE RESEARCH
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2022
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IF 2.555
Xiaotian Liu,Shanjun Wu,Yan Gong,Lili Yang
Purpose To compare the therapeutic effects of different forms of nintedanib ophthalmic preparations on neovascularization corneal alkali burns in rats.Methods Forty rat models of left eye corneal alkali burns were constructed, and the five groups (N = 8) were treated with normal saline, dexamethasone ointment (dexamethasone), 0.2% nintedanib aqueous solution and nintedanib nano thermoreversible hydrogel (NNTH). A slit lamp microscope was used to observe the area of neovascularization. The levels of the inflammatory factors were detected by ELISA. HE staining was performed on the rat corneas. Vascular endothelial growth factor (VEGFA) was detected by immunohistochemistry, and the expression of corneal VEGFA and CD31 was detected by western blotting. An MTT assay was performed to detect the cytotoxicity of nintedanib on human corneal epithelial cells (HCECs) and human umbilical vein vascular endothelial cells (HUVECs). Cell migration was detected by a cell scratch assay, and the proportion of apoptotic cells was detected by Annexin/PI double staining. Immunofluorescence and western blotting were performed to detect the protein expression of VEGFA and CD31.Results NNTH had a stronger inhibitory effect on corneal neovascularization (CNV) in alkali-burned rats while reducing the level of inflammatory factors. NNTH had a longer drug duration of release than nanoformulations in vitro. Nintedanib at low concentrations (<8 μM) had no significant cytotoxicity to HCECs but significantly induced apoptosis and inhibited the expression of VEGFA and CD31 and the migration of HUVECs.Conclusions Nanomorphic thermoreversible hydrogel is superior among the nintedanib ophthalmic preparations, showing better inhibition of CNV in alkali-burned eyeballs and it blocked the migration and proangiogenic ability of HUVECs.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Chaohui He,Peng Zhang,Yong Wang,Yujuan Zhang,Tuoping Hu,Libo Li,Jinping Li
The selective removal of carbon dioxide (CO 2 ) from acetylene (C 2 H 2 ) is an important separation process in the petrochemical industry, but is challenging due to the similar physicochemical properties of the two gases. Using CO 2 -selective adsorbents that have preferential affinity for CO 2 over C 2 H 2 in pressure swing adsorption was deemed a promising separation method for the separation of CO 2 /C 2 H 2 mixtures. Herein, we report an ultramicroporous metal-organic framework, Y-bptc, to achieve efficient separation of CO 2 /C 2 H 2 through thermodynamic and kinetic synergetic effects. The unique cage-type structure interconnected by small windows exhibits high adsorption capacity for CO 2 while efficiently impeding adsorption diffusion of C 2 H 2 , which was proved by the single-component equilibrium and kinetic adsorption curves. Grand canonical Monte Carlo (GCMC) molecular calculations further show that the µ 3 -OH − of the framework have a stronger adsorption affinity for CO 2 through forming hydrogen bonds. Breakthrough experiments using Y-bptc as a CO 2 -selective adsorbent proved that high-purity C 2 H 2 (>99%) could be directly produced from one-step separation of CO 2 /C 2 H 2 (1/1, v/v) mixtures, which greatly reduced the separation process and energy consumption. In addition, the structure of Y-bptc due to the high charge density of the Y6 cluster has high stability under humid and high-temperature conditions adding to the application possibility in industry.
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高影响因子
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
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2022
·Vol. 86
·期 12
·1641-1647
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IF 2.337
Zhou Yuyang,Mang Rongchen,Du Xuefei,Cai Heng,Zhou Hua
2,5-furanediformate Isooctyl is a potential new green biobased plasticizer. At present, most of the preparation methods are chemical methods, which not only have many by-products and are difficult to separate, but also cause environmental pollution. In this paper, the immobilized lipase Novozym435 was used as the catalyst to catalyze the transesterification of 2,5-furanediformate dimethyl ester and isooctyl alcohol to prepare 2,5-furanediformate isoocty in organic medium, and the reaction process was optimized. The optimal process conditions were determined by single factor experiment: in 10 mL toluene system, the additional amount of immobilized lipase Novozym435 was 0.02 g, the molar ratio of 2,5-furanediformate dimethyl ester (1 mmol) and isooctyl alcohol was 1:4, and 1 g 4Å molecular sieve was added to the reaction system, the reaction temperature was 50°C, the reaction time was 24 h, and the conversion rate of 2,5-furanediformate isoocty was 89.63%.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Cuiyi Liang,Qiong Wang,Wen Wang,Carol Sze Ki Lin,Yunzi Hu,Wei Qi
Lignocellulosic biomass is the most abundant feedstock in production of bio-based fuels and materials. In order to achieve high conversion efficiency, enzyme cocktail has been assessed by numerous studies as a powerful tool to allocate diverse specific activities in one matrix. This study reported an efficient cellulase cocktail produced by co-cultivation of several Penicillium strains with lytic polysaccharide monooxygenases (LPMOs) producing strains. The optimal inoculum proportion was screened with hydrolysis yield as the indicator and through ANOVA analysis. When blending the consortium-derived enzyme cocktail with commercial cellulase preparation, the highest hydrolysis yield reached 88.7%, equivalent to 32% increase compared to using commercial cellulase alone. The behind structure-effect relationship between the substrate and enzymatic degradation was illustrated. Comparative analysis of the enzyme components, activities and the strains transcriptome provided a comprehensive evaluation and insights of the proposed Penicillium consortium, indicating it as a potent cellulase cocktail producer for enhancing lignocellulose biodegradation.
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高影响因子
Catalysts
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2022
·Vol. 12
·期 11
·1357
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IF 4.501
Sijin Zuo,Yinqiao Zhang,Ruixin Guo,Jianqiu Chen
Spent caustic wastewater produced in a soda plant has a high concentration of ammonia nitrogen (NH4+-N). As excessive NH4+-N discharging into water bodies would cause eutrophication as well as destruction to the ecology balance, developing an efficient technology for NH4+-N removal from the spent caustic wastewater is imperative in the current society. In this study, an electrochemical process with graphene electrodes was designed for the NH4+-N removal in the spent caustic wastewater. The removal efficiency of the NH4+-N during the electrochemical process could reach 98.7% at 4 A in a short treatment time (within 120 s) with an acceptable energy consumption (6.1 kWh/m3-order). NO3−and NO2−were not detected during the electrochemical process. An insignificant amount of NH2Cl, NHCl2, and NCl3produced in the treatment suggested that little of the NH4+-N reacted with chlorine, that is, chlorination played a negligible role in the NH4+-N removal. By electron equilibrium and nitrogen conversion analysis, we think that NH4+-N was primarily converted to NH2(ads) on the surface of a graphene electrode by one-electron transfer during the direct oxidation of the electrochemical process. Due to the high calcium ion (Ca2+) in the spent caustic wastewater, the electrode scale significantly increased to 1.4 g after treatment of 240 s at 4 A. By X-ray diffraction (XRD) analysis, the composition of the electrode scale is portlandite Ca(OH)2. Although the electrode scale was obvious during the electrochemical treatment, it could be alleviated by alternating the electrode polarity. As a result, the life and efficiency of the graphene electrode for NH4+-N removal could remain stable for a long time. These results suggest that the electrochemical process with a graphene electrode may provide a competitive technology for NH4+-N removal in spent caustic wastewater treatment.Keywords:ammonia nitrogen;electrochemistry;spent caustic;graphene electrode;electrode scale
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高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2022
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IF 4.52
Junli Feng,Yuanyuan Wu,Jian Zhang,Renyao Jin,Yinlai Li,Qing Shen
Microcystin-LR (MC-LR) contamination in aquatic foods is a serious health threat to people. Here, a simple aptamer-based colorimetric lateral flow assay (LFA) was developed for on-site and visual detection of MC-LR for the first time. This detection system was designed on the basis of competition for Apt-A2C aptamer between MC-LR and its partial complementary sequence. Apt-A2C modified gold nanoparticles (AuNPs) were used as the signal reporter to realize the colorimetric readout by naked eyes, and the signal intensity of test line was inversely proportional to the concentration of MC-LR in the sample solution. Under optimized conditions, this aptamer-based LFA platform can visually detect MC-LR as low as 2.5 ng/mL with a linear range of 1–50 ng/mL, and an instrumental limit of detection of 0.84 ng/mL using a scanning strip reader. The whole assay can be finished within 5 min, starting from sample loading to color acquisition. The developed aptamer-based LFA was successfully applied in the detection of MC-LR in spiked fish tissue samples with the recovery rates ranged from 74.3% to 85.6%, and the results agreed well with those of tandem mass spectrometry . Besides, it had excellent selectivity toward MC-LR as the detection results were not affected by the potentially interfering molecules in real aquatic food matrix. Therefore, the LFA strip is an easy-to-use tool for instrument-free detection of MC-LR, and it can be applied to other toxins in aquatic foods with available aptamers.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
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IF 4.326
Chao Jiang,Yao Yang,Binbo Jiang,Jingyuan Sun,Zhengliang Huang,Zuwei Liao,Jingdai Wang,Yongrong Yang
Multiphase polypropylene is an important engineering plastic. Stickiness concerns in multiphase polypropylene particles with a high rubber content are well known, and they are not favorable to industrial production stability. However, there has been a scarcity of green and effective surface stickiness reduction techniques. In this work, a Damp mode was employed to construct multiple concentration zones at the particle scale, allowing the synthesis of polypropylene with a high rubber content, reduced particle surface stickiness, and dramatically increased copolymerization activity. The rubber content limit of the conventional gas-phase technique (designated as the Dry mode) was found to be approximately 30 wt % before the particles became sticky, whereas the rubber content limit of the Damp mode was found to be 45 wt %. More notably, early in the procedure, the gas-phase copolymerization activity was boosted by 86.7%. Furthermore, given the same rubber content, the impact strength and flexural modulus of the polymers synthesized in both modes and commercial resins were found to be essentially the same. Lastly, the polymer particles synthesized in Damp mode had a multizone structure with an EPR-rich core and an EPR-poor shell. This work establishes a new method for reducing the surface stickiness of multiphase polypropylene particles, paving the way for the manufacturing of high-performance polypropylene resins using ordinary polypropylene plants.
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高影响因子
Surfaces and Interfaces
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2022
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IF 6.137
Yaoshen Ye,Kaixin Guo,Ruirui Cui,Min Zhang,Xu Wang,Majed A. Bajaber,Chaoyong Deng
The energy storage density of ferroelectric capacitors is mainly determined by their polarization and breakdown strength . In this work, the energy storage performance of BNT thin films was enhanced by introducing an amorphous alumina to construct Al 2 O 3 -Bi 0.5 Na 0.5 TiO 3 (AO-BNT) heterojunctions by sol-gel process. The results reveal that the Bi 0.5 Na 0.5 TiO 3 /Al 2 O 3 /Bi 0.5 Na 0.5 TiO 3 (BNT/AO/BNT) structure significantly improves the breakdown strength of BNT, the breakdown electric field is increased from 1050 to 3082 kV/cm, and the energy storage density is also increased from 8.7 to 19.9 J/cm 3 . This is mainly due to the built-in electric field formed by the opposite double-heterojunction can counteract part of the external electric field, and this capacitor-like structure concentrated more applied electric field on the amorphous alumina with better breakdown ability, thus provides a new way to improve the energy storage performance of dielectric ferroelectric capacitors.
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高影响因子
危险品化学品经营许可证（带存储）