ACS Sustainable Chemistry & Engineering
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2019
·
IF 6.97
Fangbao Fu,Dongjie Yang,Huan Wang,Yong Qian,Fang Yuan,Jiqin Zhong,Xueqing Qiu
This work demonstrates a kind of lignin-derived carbon/zinc oxide (LDC/ZnO) composite prepared through a facile electrostatic self-assembling carbonization process. Solidification of the lignin/zinc oxalate precursor results in zinc oxalate (ZnC2O4) crystalizing in lignin. The crystalized ZnC2O4 particle acts as both catalysts and activators during the high-temperature carbonization process. The prepared LDC/ZnO composites show a unique 3D porous framework structure, where ZnO nanoparticles are enchased by the lignin-derived carbon nanosheets. The LDC/ZnO composites show a high pore volume, large specific surface area, and high electrical conductivity, thus demonstrating excellent electrochemical properties. LDC/ZnO-700 displays a high gravimetric capacitance (193 F·g–1 at 0.5 A·g–1), outstanding durability, and superior rate capability in a two-electrode system using the polyvinyl alcohol/KOH gel as the electrolyte. The capacitance is still maintained as 161 F g–1 at 2.0 A·g–1 after 10 000 cycles. This article provides a simple approach for preparing a lignin-derived carbon composite for energy storage and also a new way for lignin valorization.
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高影响因子
Microbiology Research
·
2023
·Vol. 14
·期 4
·1489-1510
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IF 1.5
Mohamed Sharaf,Eman Jassim Mohammed,Eman M. Farahat,Amani A. Alrehaili,Abdulsalam Alkhudhayri,Ahmed Mohamed Ali,Abdullah A. Zahra,Shadi A. Zakai,Amr Elkelish,Maha AlHarbi,Mai Farag Saad
This study targeted developing a novel Zinc oxide with alpha hematite nanoflowers (NFs)-loaded bee venom (Bv) (Bv-ZnO@αFe2O3NFs) as a bio-natural product from bees to combine both the advantages of combination magnetic properties and the antimicrobial and anti-biofilm properties on isolated coliform bacteria from the effluent of wastewater treatment plants. About 24 isolates of treated wastewater isolates were multidrug resistant (MDR). The phylogenetic grouping ofEscherichia coli(E. coli) andKlebsiella pneumonia(K. pneumonia) showed that the largest group was Group A, followed by Group B2 and Group B1. Fourier transform infrared (FTIR), The X-ray diffraction (XRD), and scanning electron microscopy-energy dispersive X-ray analysis (SEM− EDX) validated the coating operation’s contact with Bv onto ZnO@αFe2O3NFs. According to high-resolution transmission electron microscopy (TEM) and selected area electron diffraction (SAED), pattern analyses for prepared nanoformulations exhibited a spherical shape of αFe2O3(~9–15 nm), and floral needle shapes with uniform distribution of size with aggregation of ZnOαFe2O3and Bv-ZnO@αFe2O3NFs around (~100–200 nm). The toxicity of Bv-ZnO@αFe2O3NFs was comparable up to 125 µg mL−1, when it reached 64.79% (IC50, 107.18 µg mL−1). The antibacterial activity showed different zones of inhibition against different isolates. The biofilm inhibitory activity of NPs and NFs showed a highly significant reduction (p< 0.001) in treated biofilms with ZnO@αFe2O3and Bv-ZnO@αFe2O3. In essence, ZnO@αFe2O3and Bv-ZnO@αFe2O3NFs are promising antimicrobials for inhibiting the growth and biofilm of MDRE. coliandK. pneumoniaisolates, thereby, biocontrol of wastewater.Keywords:alpha magnetite nanoparticles;nanoflowers;bee venom;antimicrobial activity;anti-biofilm formation;drug delivery
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PROGRESS IN ORGANIC COATINGS
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2023
·
IF 6.6
Xingguo Zhang,Baoxue Zhang,Rongrong Mao,Zulong Huang,Keyan Jing,Changchun Jin,Bin Yang,Jun Qi,Manman Yu,Guoyuan Xiong,Yong Hu
Multi-layer active food packing films fabricated with outer layer made of sodium alginate (SA) and inner layer made of k -carrageenan (CAR) and gelatin (GEL) contained with oregano essential oil (OEO) and ZnO nanoparticles (ZnO NPs) were developed through layer-by-layer (LBL) assemble method and characterized in this study. The results of fourier transform infrared (FT-IR) demonstrated OEO, ZnO NPs and SA outer layers were successfully incorporated into the multi-layer film system by hydrogen bonding . ZnO NPs significantly improved the mechanical properties , thermal stability, UV resistance and retention of OEO of the films ( P < 0.05). Scanning electron microscope (SEM) images clearly showed SA/CAR-GEL-OEO film and SA/CAR-GEL-OEO-ZnO NPs film had a bilayer structure. Noteworthy, the multi-layer films exhibited higher OEO retention compared to the mono-layer films, and compensated the negative effect of ZnO NPs and OEO on the light transmittance while enhancing the UV resistance of the films. The multi-layer films exhibited stronger antioxidant and antibacterial activity than mono-layer films. To summarize, the multi-layer films loaded with OEO and ZnO NPs enhanced antioxidant and antibacterial activities and displayed great potential as active packaging for food preservation.
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ChemistrySelect
·
2023
·Vol. 8
·期 28
·e202301088
·
IF 2.1
Hui Zhou,Xiaoliang Sun,Wenming Guo,Tingting Bao,Yi Zhang,Chenxu Guo,Hanning Xiao,Hang Qin,Pengzhao Gao
Graphical [+] These authors contributed equally to this articleDurable CuO/ZnO/CeO 2 /ZrO 2 catalyst on SiC support for methanol steam reforming was prepared by the combination of inverse microemulsion method and precipitation method. The methanol conversion of the catalyst was still reached 98.8 % after 150 h, considerably higher than that of solution combustion method (70 %), without carbon deposition and pronounced sintering after the reaction. Durable CuO/ZnO/CeO 2 /ZrO 2 catalyst on SiC support for methanol steam reforming (MSR) was prepared by the combination of inverse microemulsion method and precipitation method which is termed as inverse microemulsion/precipitation method. The presence of Ce−O−Zr solid solution facilitated the production of oxygen vacancies and Ce 3+ species in the prepared CuO/ZnO/CeO 2 /ZrO 2 catalyst. Owing to the unique tiny reaction pool and the addition of precipitant for inverse microemulsion/precipitation method, the particle size of the prepared catalyst was principally between 2 and 6 nm, with an average size of 3.66 nm. Besides, the small particle size and the highly dispersed of Cu species boosted the reduction performance of the catalyst, enabling the reduction temperature to be only 201 °C. The methanol conversion of the reduced catalyst was still reached 98.8 % after 150 h, considerably higher than that of solution combustion method (70 %), without carbon deposition and pronounced sintering after MSR reaction.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Jiangsheng Li,Zhu You,Benchao Zheng,Shiyi Zhai,Kuangda Lu
Despite that radiotherapy (RT) is a prevalent treatment of cancer, enhancing tumor dose deposit and reversing resistance are two major challenges in its clinical application. Here, we report Au–ZnO (AZ) nano matches that drastically increase reactive oxygen species (ROS) generation and alleviate hypoxia in RT on triple-negative breast cancer. Upon X-ray irradiation, Au increases X-ray attenuation and excites the adjacent ZnO by electron scattering, electron transfer, and energy transfer. Meanwhile, Au plays the role of a reservoir of electrons that promotes the charge separation in ZnO, thereby significantly improving the ROS production efficiency and causing the ROS burst. The ROS generation efficiency of AZ is determined to be 2.03 times that of Au. In contrast, a physical mixture of Au and ZnO only slightly increased the ROS generation compared to Au (1.18 times). Moreover, AZ catalyzes H2O2 decomposition to produce oxygen at excited states, thus modulating tumor hypoxia. Clonogenic assay showed that AZ had efficient radiosensitization with radiation enhancement factors of 4.01 and 3.50 in 4T1 breast cancer cells under normoxia and hypoxia, respectively. AZ-enhanced RT can successfully eliminate or shrink tumors (two of the six were completely removed) upon 4 Gy of X-ray irradiation on 4T1 tumor-bearing mice. At the end point, the average tumor size in AZ with the RT-treated group was only 1.8% of that of PBS with RT, significantly outperforming the other control groups including a physical mixture of Au and ZnO nanoparticles at the same concentrations..
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Shaofei Guo,Xiaoyu Chen,Yuetao Ling,Han Wang,Xin Wei,Ruihua Pan,Peng Wang
A highly sensitive electrochemical nanostructure sensor based on a ZnO@ZIF-8 nanocomposite-modified carbon paste (ZnO@ZIF-8/CPE) electrode was constructed for trace analysis of sulfamethoxazole (SMX). ZnO@ZIF-8 was synthesized by the hydrothermal method and characterized using scanning electron microscopy and X-ray diffraction. Electrochemical experiments demonstrated a synergistic effect of ZnO and ZIF-8 that endowed the prepared sensor with excellent electrocatalytic behavior towards SMX oxidation. Under optimal conditions, the ZnO@ZIF-8/CPE sensor demonstrated a wide linear range of 0.04-50 μM for SMX and a regression coefficient of 0.9914 and a limit of detection of 0.02 μM. The sensor possessed good stability, selectivity, anti-jamming ability and reproducibility and was successfully used for SMX determinations in egg samples. The proposed sensor is ready to use for biomedicine and environmental protection monitoring.
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Qing Li,Xiaojie Zhuang,Guanhong Zhou,Zhenfei Yang,Ting Yang,Hongbo Xiao,Tao Xu,Wenlei Wang
A novel polyacrylic acid/carboxylated nanocellulose fiber/polyethylene glycol hydrogel loaded with nano-ZnO (ZnO-PAA/CNF/PEG: GH-2 (wt(ZnO)% = 12% and wt(PEG)% = 16%)) was synthesized to remove Cr(VI) from wastewater by adsorption synergistic photocatalytic reduction. The effects of ZnO content, PEG content and pH on the removal efficiency of Cr(VI) were investigated. The removal performance and mechanism of Cr(VI) by hydrogels were systematically studied by various techniques. The results showed that when the initial pH = 2, the initial concentration of Cr(VI) = 20 mg/L, the hydrogel dose = 0.5 g/L, and Irradiation power of mercury lamp was 500 W, the removal efficiency of Cr(VI) was 97.22% (dark adsorption for 60 min and photocatalysis for 50 min). The addition of PEG greatly reduced the agglomeration of nano-ZnO in GH-2 and facilitated the separation of photogenerated electron-hole pairs. The adsorption process of Cr(VI) by GH-2 accords with pseudo-second-order kinetics. The photocatalytic process conforms to the pseudo-first-order reaction kinetics. Under the optimal experimental conditions, the removal efficiency of Cr(VI) by GH-2 was still as high as 87.99% after 5 cycles. The removal mechanism of Cr(VI) was mainly through electrostatic attraction, chemical adsorption and photocatalytic reduction. This study provides a feasible method for the synthesis of hydrogel materials with excellent adsorption synergistic photocatalytic performance for the treatment of Cr(VI)-containing wastewater.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Zi-ang Zhang,Li-fan Nie,Quan Zhou,Zhi-Dan Song,Ge-bo Pan
The structure and morphology of gas-sensitive materials were extremely important to performances of gas sensor. In this work, ZnO nano-crystalline (ZnO NCs) was synthesized on foam-like GaN (F-GaN) by sol-gel method as gas-sensitive materials of H 2 S gas sensor. When ZnO NCs/F-GaN composite structure was used as gas- sensitive materials for detection of H 2 S with the concentration of 50 ppm at 220 °C. Importantly, rapid response and recovery time was 78 and 31 s, respectively. Enhancement of the sensing response was mainly attributed to the combination between ZnO NCs and F-GaN. In addition, a multiphase catalytic mechanism was proposed to description the catalytic role of F-GaN in the gas sensing procedure. These results further broadened the application of as-prepared metal oxide semiconductor based GaN in the gas sensing field.
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高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 28
·9570-9577
·
IF 6.4
Na Chen,Wan-Xiong Yong,Tuo-Dong Xiong,Guo-Dong Fu
The development of viologen-based photochromic composite materials with a fast response to ultraviolet light has become a major research focus. In this paper, we fabricated viologen-based composite films with excellent durability and rapid photochromic performance by the solution casting method. The films changed color within one second when exposed to ultraviolet light (3 W, 365 nm). This was because ZnO NPs photogenerated electrons that enhanced the photoreduction of viologens with matched energy bands. The decoloration process of the films could be regulated by different moisture levels while keeping their photochromic properties unaffected. Moreover, the films exhibited less than 15% change in absorbance over 20 repeated coloring and fading cycles. Therefore, the excellent photoresponsiveness, repeatability and environmental friendliness of the films provide them potential for applications in areas such as rewritable paper, solar UV detection, smart windows and anti-counterfeiting.
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高影响因子
Solar RRL
·
2023
·Vol. 7
·期 11
·2300019
·
IF 7.9
Chunyan Wu,Shuo Ding,Lijian Zhang,Fangcheng Huang,Ganhua Qiu,Jinpeng Yang,Fayin Yu,Tao Sun,Lei Qian,Chaoyu Xiang
Enhancing the absorption of incident light and promoting the effective separation of carriers are two effective strategies to improve the power conversion efficiency of lead sulfide quantum dots (PbS CQDs) solar cells. Herein, a simple solution spin-coating method to synthesize a novel ZnO electron transport layer with a wrinkled surface structure is developed. ZnO-wrinkled surface structure can enhance the absorption of PbS CQDs solar cells in the range of 600–1000 nm compared with the normal planar ZnO film, leading to the enhancement in the short-current density. Further, by combining the wrinkled and planar ZnO to form a bilayer ZnO, the energy band alignment between ZnO and PbS CQDs is more suitable for the carrier transmission. Finally, PbS CQDs solar cell based on the bilayer ZnO yields a champion efficiency of up to 13.5%, presenting almost 10% enhancement compared to that based on the single planner ZnO. This method provides a simple and cost-effective method to enhance the efficiency of PbS CQDs thin-film solar cells.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Fuyuan Han,Xue Ye,Xinhua Gao,Jinghao Yu,Lisheng Guo,Jie Li
ZnO/ZrO 2 solid solution was introduced as the catalyst for synthesizing dimethyl carbonate (DMC) from propylene carbonate (PC) and methanol. Homogeneous catalysts with strong alkaline nature are the current main catalysts for this reaction. Therefore, to supplant the former with a more applicable multiphase one, it is necessary to construct stable and efficient alkaline active centers on the surface of solid catalysts. The ZnO/ZrO 2 solid solution created defective structures of coordinative unsaturation in the form of oxygen vacancies (O V ) by substituting Zn atoms for Zr atoms in ZrO 2 crystals. Characterizations showed that electrons were transferred to the surrounding Zn atoms upon the formation of these O V , leading to a local enrichment of electrons and the formation of basic active centers. The number of oxygen defects and the alkalinity were effectively regulated by changing the ratio of the two metal atoms in the solid solution. Experiments demonstrated that the catalyst had the best DMC selectivity (92.2%) and the highest DMC yield (57.2%) at a 1:1 ratio of Zn to Zr, at 160 °C and 4 h. This superior performance not only establishes the feasibility of solid solution catalysts in synthesizing DMC but also provides a new perspective on the essential understanding of the active centers of such catalysts.
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高影响因子
Journal of Environmental Chemical Engineering
·
2019
·
IF 0
Sefiu A. Rasaki,Tiju Thomas,Minghui Yang
Due to high surface area and large pore volume, nanostructure zinc oxides/its composites have gained a lot of research interests for heavy metal removal from water. Low stability of the ZnO at low and high pH is however a problem. In this work, ZnO@MgO, ZnO and MgO are synthesized via co-precipitation, followed by calcinations. The samples show remarkable removal of Pb(II) from water when compared to commercial samples; the best results is obtained using ZnO@MgO which exhibit adsorption capacity of 250 mg g −1 equivalent to 100% removal capacity. The optimum removal capacity is retained in a wide range of pH (i.e. pH 6–9) at temperature 30 °C. Low adsorption capacity coupled with low stability in acidic condition; a problem associated with ZnO-based adsorbents when it is being used for the removal of heavy metals from water/wastewater; often prevents this system from being practically used; is overcome here. The ZnO@MgO adsorbent shows chemical stability over wide range of pH(2–9). The adsorption is chemisorptive in nature, endothermic and evidently aided by high surface heterogeneity (△H° ˜25 kJ mol-1 and △S°˜110.6 J mol −1 K −1 ). Appreciable adsorption capacity over wide range of pH-value, high recovery and reusability results from nanosphere morphology of the composite sample; all these novel properties are attributed to the strong electronic coupling effect between MgO and ZnO. This work is expected to spur further research on ZnO-based composite materials in allied areas, including (i) mitigation of atmospheric pollution and (ii) water treatment processes.
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