CHEMICAL ENGINEERING SCIENCE
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2022
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IF 4.889
Yuan Shu,Xuefeng Ma,Xiaolan Duan,Dandan Liu,Li Wang,Qiang Niu,Pengfei Zhang
Designing highly dispersed metal nanoparticles (NPs) working at high temperature reductive atmosphere remains a challenge, especially for non-noble metal NPs (e.g., Ni NPs). Here, a solid-state co-precipitate method was developed to prepare sintering-resistance Ni-ZnO catalyst. The catalyst featured as high Ni dispersion by this solid-state co-precipitate method in solid solution, and ∼ 6 nm Ni NPs were obtained even in a long-term reduction pre-treatment (500 °C, H 2 ). Interestingly, a well-established strong metal and support interaction (SMSI) effect of Ni-ZnO was observed during the reduction process. A thin ZnO overlay was clearly deposited on the Ni metal NPs, effectively tuning the geometry and electronic structure of the exposed Ni metallic sites. Combined with the evidence of CO-TPD, H 2 O-TPD, H 2 O-titration, and CO-H 2 O TPSR, the existence of Ni-ZnO SMSI strongly provides the unusual pathway of redox mechanism during water gas shift (WGS) reaction, avoiding the tendency of CO methanation reaction in traditional Ni-based catalytic systems.
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高影响因子
MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Meijun Ni,Jia Chen,Chenxi Wang,Yilin Wang,Linzi Huang,Weicheng Xiong,Pengcheng Zhao,Yixi Xie,Junjie Fei
Dopamine is one of the most important neurotransmitters in the human body, and its sensitive detection and quantification are important for the diagnosis, prevention, and treatment of related neurological diseases. Herein, a highly-sensitive dopamine electrochemical sensor has been constructed based on the two-dimensional transition metal carbide Ti 3 C 2 MXene, graphitized multi-walled carbon nanotubes and ZnO nanospheres. Dopamine presents a standard reversible redox reaction on the sensor, and density flooding theory has been successfully applied to reveal the redox process of dopamine. Under optimal experimental conditions, the sensor exhibits a wide linear range (0.01–30 μM), low limit of detection (3.2 nM) and high sensitivity (16 A/M). Furthermore, the sensor has excellent stability and anti-interference ability, satisfactory accuracy in human serum samples, which can be used for the detection of actual samples. This work has provided a novel method for detecting dopamine and a new idea for the application of MXene and metal oxide semiconductor in electrochemical sensors.
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APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Lili Zhang,Chun Shi,Hailong Lu,Hongwei Li,Xiaofan Zhou,Zhiguo Wang,Jinxia Ma
The recyclability of heterogeneous catalysts directly affects their utilization efficiency, use cost, sustainability, and environmental issues. Herein, the flower-like ZnO-Cu nanoparticles with high interfacial reactivity were in-situ synthesized in the porous cellulose gel to obtain the ZnO-Cu/cellulose composite gel (ZnO-Cu/CCG) catalyst, which possesses superior recycling and reusing stability thanks to the bulk nature of the gel. The ZnO-Cu/CCG catalysts with tunable sheet-like and flower-like ZnO were fabricated by the dissolution of cellulose into zinc chloride (ZnCl 2 ) solvent and regeneration using different coagulating baths (water, ethanol, or isopropanol). The CCG prepared from isopropanol coagulation exhibited the highest specific surface area (291.6 m 2 /g) and porosity (92.3%). The various network structures of CCG provided different nucleation sites and growing spaces for controllable preparation of ZnO with tunable morphology. The complete removal of methyl orange (MO), Congo red (CR), and methylene blue (MB) required only 80 sec, 3 min, and 5 min, using flower-like ZnO-Cu/CCG catalysts prepared by isopropanol coagulating bath, the pseudo-first-order rate constant (k) is 2.8170 min −1 , 1.1330 min −1 , and 0.8506 min −1 , respectively, much higher than that of the ZnO-Cu powders. Furthermore, the catalytic reusability of ZnO-Cu/CCG can be investigated over 50 successive cycles, in which the catalytic efficiency did not decrease appreciably.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Fanjing Wei,Xiaoxia Zhang,Junjie Liao,Jiawei Guo,Weiren Bao,Liping Chang
The reactive adsorption desulfurization mechanism of thiophene over Cu/ZnO sorbent in coke oven gas (COG) was established by a combination of theoretical and experimental study. The adsorption behavior of thiophene on Cu surface was studied by density functional theory (DFT) method. The C 4 hydrocarbons releases and sulfur migration over Cu/ZnO sorbent during the thiophene removal process were investigated by comparing with that over CuO, ZnO and CuO+ZnO (prepared by mechanical grinding of CuO and ZnO) sorbents. The results show that the parallel adsorption of thiophene on hexagonal closest packing (HCP) site of Cu (1 1 1) crystal face is the optimal adsorption mode. Cu 0 nanoparticles in Cu/ZnO sorbent have two important roles: (1) adsorb and dissociate H 2 , and (2) cleave the C–S bond of thiophene. The sulfur after the cleavage of C–S bond could transfer directly to ZnO and eventually be converted into ZnS without the intermediate product CuS. During thiophene removal, C 4 H 6 and C 4 H 10 are generated over Cu/ZnO sorbent in the presence of H 2 . ZnO in Cu/ZnO sorbent not only acts as an excellent sulfur accepter, but can greatly affect the adsorption properties by enhancing the spillover and storage of hydrogen atoms . Increasing the interaction between Cu 0 nanoparticles and ZnO to enhance hydrogen spillover is an effective way to improve the thiophene reactive adsorption activity of Cu/ZnO.
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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
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2022
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IF 1.279
Tao Li,Hongjun Kang,Songtao Lu,Wei Qin,Xiaohong Wu
As space exploration moves further and further into deep space, it is a big challenge to develop antistatic inorganic thermal control coating with lightweight and strong adhesion to substrates. Herein, this work reported an inorganic antistatic AZO/Al 2 O 3 -ZnO-Y 2 O 3 composite coating fabricated by PEO combined with ALD methods. The results show that when the Zn/Al ratio of deposited AZO film is 24:1, its overall performance is the optimal, and the emissivity, absorptivity and resistivity are 0.892, 0.409 and 1.15 × 10 –3 Ω·cm, respectively, which can meet thermal control application requirements of spacecraft. Furthermore, the AZO/Al 2 O 3 -ZnO-Y 2 O 3 composite coating shows a good electron-resistance irradiation performance, which is because AZO conductive film is easy to generate free carriers, speed up some electron transport and make electrons better disperse and conduct, thus reducing the penetration depth of electron irradiation. This work provides a material basis for thermal control system of spacecraft with long life and high reliability.
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Biomaterials Advances
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2022
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IF 0
Xiaowei Yin,Shuocheng Huang,Shibo Xu,Linna Chang,Xingjun Zhao,Zhenhua Chen,Xifan Mei,Xiuqiu Gao
The complex wound environment and abnormalities in self-metabolism of diabetic skin defects lead to impaired angiogenesis, which can easily lead to bacterial infection and increased inflammation. Therefore, there is an urgent need for multifunctional composites with antimicrobial and pro-angiogenic properties to improve the current therapeutic outcomes of diabetic wounds. In this study, we described an EGCG-modified zinc oxide quantum dots (ZnO QDs) hydrogel ( [email protected] ) for the treatment of delayed diabetic wounds. In vitro antimicrobial assays showed that [email protected] effectively cleared 95.6% of MRSA and 97% of Amp r E. coli with good bactericidal activity. Western blotting assay analysis showed that [email protected] downregulated trauma inflammatory factors (TNF-α, IL-6) by 46.9% and 57%, respectively, while upregulating 1.7-fold VEGF and 2-fold EGF, accelerating wound healing by reducing inflammatory response and promoting proliferation of vascular endothelial cells and skin epidermal cells. After 15 days of [email protected] treatment, the rate of skin lesion closure in rats was 96.3%, which was much better than that of 65.4% in the control group. Safety experiments showed that [email protected] was reassuringly biocompatible and harmless to vital organs. The obtained results suggested that [email protected] had the potential to be a safe and effective treatment method with a promising future as a diabetic wound treatment material.
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PubMed
POSTHARVEST BIOLOGY AND TECHNOLOGY
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2022
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IF 6.751
Zhiwen Qi,Xingying Xue,Xuefeng Xu,Hao Zhou,Wenjun Li,Guliang Yang,Pujun Xie
The underutilized by-products of hydrophilicity olive mill wastewater phenols (OPs) have great antimicrobial potential. ZnO NPs is one of most wildly used nano material with anti-bacterial function as well. This study aimed to prepare the detoxified and antimicrobial-enhanced OPs capping ZnO nanoparticles (OPs-ZnO NPs) containing metal core of ZnO NPs and organic shell of OPs, respectively. The OPs-ZnO NPs was chemically coordinated/chelated driven by Lewis bases (NaOH) in aqueous solution. The results obtained by SEM and TEM showed that those irregular sphere OPs-ZnO NPs were ranged from 58 to 92 nm, with an OPs caption of 35.40% (w/w). Importantly, the in vitro results showed that the strategy of capping OPs in ZnO NPs decreased the toxicity of ZnO NPs (< 0.02 g/L). Moreover, OPs-ZnO NPs presented a higher stability in simulated gastrointestinal digestion (Zn 2+ < 0.07 g/L after 12 h). The results also showed that the protective coating of OPs-ZnO NPs and OPs-ZnO NPs/CMC (carboxymethyl cellulose) enhanced the antimicrobial activity of Escherichia coli , Staphylococcus aureus and Aspergillus niger . Furthermore, the coating of OPs-ZnO NPs/CMC decreased the weight loss and the rotting ratio of fresh strawberry , and ultimately prolonged its shelf-life at least 4 days under 25 ºC. Therefore, this study provided a biosafety strategy for the preparation of detoxified and antimicrobial enhanced OPs-ZnO NPs and its CMC protective coating for fresh produce throughout storage.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
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IF 4.326
Xing Xing,Yurong Zhao,Congbin Xu,Yali He,Chen Yang,Kang Xiao,Jianzhong Zheng,Baolin Deng
Membrane distillation, an emerging desalination technology, shows much promise for treating industrial wastewater with high salinity. One major challenge that impedes its implementation for industrial applications is the wetting of hydrophobic membranes such as polyvinylidene fluoride (PVDF), resulting in a sharp decline in salt rejection. Wetting occurs when the feed solution contains surfactants, such as sodium dodecyl sulfate (SDS). It has been demonstrated that growing rough structures on the membrane surface followed by fluorination helps the membrane maintain its hydrophobicity. In this study, an omniphobic membrane was successfully prepared by first growing a layer of dense nano-ZnO needles on the surface of a pristine PVDF membrane, followed by a typical fluorination treatment. The modified membrane, with its surface similar to a nano sea urchin in appearance, exhibited a superior antiwetting property, having a high contact angle about 160° against a 50 g/L NaCl solution containing 0.3 mM SDS. The modified membrane showed a fairly good wetting resistance against 0.3 mM SDS, having a nearly 100% salt rejection in treating 50 g/L NaCl, whereas the pristine PVDF membrane could be easily wetted. The modified PVDF membrane shows promise in treating high-salinity wastewaters containing surface-active substances.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2023
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IF 5.7
Meng Cao,Wen Bin Hong,Xiao Dong Yang,Xiao Jian Yan,Lei Li,Shu Ya Wu,Xiao Long Zhang,Xiang Ming Chen
The transportation of Zn 2+ in acetic acid (HOAc) or Zn(OAc) 2 water solution was considered crucial for the successful cold sintering of ZnO ceramics. However, our work shows that ZnO ceramics can even be densified by cold sintering with the aid of solid Zn(OAc) 2 ·2 H 2 O without introducing extra free water. DSC-TG analysis reveals that pure Zn(OAc) 2 ·2 H 2 O is dehydrated completely into solid Zn(OAc) 2 during heating in an open environment, while it melts in ZnO-Zn(OAc) 2 ·2 H 2 O mixture or a high-pressure and semi-closed circumstance due to the strongly suppressed dehydration. Consequently, molten Zn(OAc) 2 ·2 H 2 O acts as the transient liquid medium for the dissolution-precipitation process at over 100 °C, and plays a dominant role in the densification, microstructural evolution , and mechanical robustness of the cold-sintered ZnO ceramics. The densification mechanism is confirmed by the pressure-time curves, and reveals a novel strategy for cold sintering of water-insoluble ceramics by introducing molten hydrated salt or alkali as the transient liquid medium.
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ACS Sustainable Chemistry & Engineering
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2023
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IF 8.4
Xinxin Xu,Anqi Liang,Hao Li,Heping Shang,Kun Qian,Weili Jia,Jason C. White,Chuanxin Ma,Baoshan Xing
Systematic understanding of the impact of nanomaterials (NMs) on the health and activity of plant-associated microorganisms is required for sustainable development of efficient nano-enabled agrochemicals. Zinc (Zn) is an essential micronutrient for plant growth and development. It plays a vital role in various physiological processes, including enzyme activation, protein synthesis, cell division, etc. The present study investigated the effects of foliar exposure to different sizes of ZnO particles, including ZnO quantum dots (ZnO QDs, 4.06 nm), ZnO nanoparticles (ZnO NPs, 60.0 nm), bulk-scale ZnO particles (ZnO BPs, 464.5 nm), and Zn ions at an equivalent Zn molar concentration (0.61 mM) on the endophytic and rhizosphere microbial communities of pumpkin seedlings. ZnO QDs increased the total plant biomass by 24.6% as compared to the control. ZnO QDs also increased the contents of total chlorophyll and carotenoids, elevated micronutrient (Zn, Fe, and B) uptake, and triggered the activities of antioxidant enzymes, such as peroxidase (POD), polyphenol oxidase (PPO), and catalase (CAT), as compared to controls. The composition and diversity of the endophytic and rhizosphere bacterial or fungal communities were significantly altered as a function of ZnO NM size, and a significant difference between the control and ZnO treatments was also evident. Linear discriminant effect size analysis (LEfSe) shows that the putative beneficial host microbes Steroidobacter (relative abundance, RA: 1.05%) and Paenibacillus (RA: 0.59%) were enriched in pumpkin seedlings treated with ZnO QDs, which may lead to greater plant growth, nutrient acquisition, and stress resistance. Cooccurrence networks indicate that ZnO QDs increased both node and link numbers of the bacterial networks by 46.94 and 123.38% in the roots, which could further stabilize the microbial community and confer resistance to environmental disturbance. Our overall findings demonstrate that ZnO QDs could enhance plant growth both directly by improving physiological performances and indirectly by modulating beneficial endophytic and rhizosphere microorganisms. Thus, nano-enabled strategies can be a promising and sustainable approach to increase crop growth and resistance to stress.
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ACS Applied Polymer Materials
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2023
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IF 5
Sujuan Yan,Meiling Wan,Weili Liao,Zhenning Dai,Guoguang Chen,Hai Li,Huaxiong Cai,Hongwu Zhang,Wenxu Zheng,Ke Ding,Wuyi Zhou
This work aims to investigate dental root filling custom gutta-percha (GP) properties based on melt extrusion 3D printing for periapical periodontal disease treatment. Zinc oxide nanoparticles are incorporated into polyurethane/gutta-percha (PGB) composites. A polyurethane/gutta-percha/ZnO (PGB-Zn) biocomposite including BaSO4, polyurethane (PU), GP, and ZnO nanoparticles is designed and fabricated. To improve the dispersion of ZnO nanoparticles, rosin is chosen to modify the surface of the ZnO nanoparticles. The PGB-Zn biocomposite exhibits a maximum tensile strength of 26.795 ± 1.173 MPa and a flexural strength of 6.037 ± 0.37 MPa. The chemical interaction between the nanoparticles and the matrix is found in the physical and mechanical characterization of the polyurethane/gutta-percha/ZnO (PGB-Zn) biocomposite. The inhibition zone test and absorbance photometry show that the composite material inhibits and kills Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The CCK-8 experimental results show that the PGB-Zn biocomposite has a cytotoxicity level of 0-I. The obtained PGB-Zn biocomposite in this work can be used for accurate root canal therapy as a filling biocomposite by a fused extrusion method, which effectively decreases the potential risk of the clinical implementation of periapical periodontal disease treatment.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Cheng Cheng,Jian Wang,Zhihao Zhao,Changchun Chen,Sheng Cui,Yifeng Wang,Lin Pan,Yaru Ni,Chunhua Lu
Semiconductor catalyst with high photocatalytic activity can be exploited via heterojunction. In this study, a new S-scheme SrTiO 3 /porous ZnO composite was rationally devised, successfully prepared by utilizing a two-step pyrolysis of SrTiO 3 /ZIF-8, and analyzed by various characterization technologies including XRD, SEM, TEM, BET, XPS, PL, UV–vis DRS, and photoelectrochemical and DFT theoretical calculations. A porous structure, tight contact, and a heterojunction formed between SrTiO 3 and porous ZnO (ZnOT) can be observed by SEM and TEM images. BET testing indicates that the SrTiO 3 /porous ZnO composite (S3ZT) shows the highest specific surface area (30.37 m 2 /g). The band gap values (E g ) of SrTiO 3 and ZnOT are around 3.17 and 2.95 eV, which agree with those obtained from DFT calculations. Compared to other samples, the SrTiO 3 /porous ZnO composite (S3ZT) shows higher light absorption and lower transfer resistance as demonstrated by UV–vis DRS and EIS results. S3ZT presents a superior photocatalytic efficiency of 48.8% in degrading 5 mg/L methyl orange (MO) irradiated by 1 h UV–vis light, which are 7- and 1.5-fold higher than pristine SrTiO 3 and ZnOT, respectively. Moreover, based on Mott-Schottky theory, active species trapping experiments, XPS determination, and DFT calculations (energy band gap and work function), it was shown to be reasonable to utilize the S-scheme charge migration process for an explanation regarding the better photocatalytic activity of SrTiO 3 /porous ZnO composite. Overall, this work will provide an effective protocol for devising and preparing semiconductor photocatalysts with S-scheme heterojunction by utilizing the superior characteristics of MOFs.
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