Inorganic Chemistry Frontiers
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2021
·Vol. 9
·期 3
·599-606
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IF 6.569
Shiyu Zhou,Jiapeng Ji,Tong Qiu,Liguang Wang,Wenbin Ni,Sheng Li,Wenjun Yan,Min Ling,Chengdu Liang
Hydrogen (H2) sensors based on metal oxide semiconductors (MOSs) have attracted considerable attention for safety concerns of traditional industries and energy storing devices. ZnO has been widely studied as an n-type MOS in H2 sensing due to the excellent stability, mobile conductive carriers, and wide bandgap. However, the poor selectivity and high working temperature limit its practical applications. Herein, we designed a heterostructure based on ZIF-8-derived ZnO by rGO functionalization to boost the selective H2 sensing. This composite demonstrated dramatic H2 selectivity against other flammable gases, particularly ethanol, which was improved by deoxygenation to reduce the surface oxygen functional groups. This sample showed excellent H2 sensing with a high response of ∼18 to 200 ppm H2, and a response/recovery time of 50/7 s at 400 °C. Even at a certain low temperature of 200 °C, the composite showed evident response to H2. The excellent gas sensing behavior could be attributed to the heterojunctions and enhanced electron mobility. Regulation of the surface oxygen-containing functional groups opens up a promising approach to adjust the gas sensing selectivity of MOS-based materials.
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LANGMUIR
·
2021
·
IF 3.882
Bowen Liu,Chuanbiao Bie,Yong Zhang,Linxi Wang,Youji Li,Jiaguo Yu
The design of photocatalysts with hierarchical pore sizes is an effective method to improve mass transport, enhance light absorption, and increase specific surface area. Moreover, the construction of a heterojunction at the interface of two semiconductor photocatalysts with suitable band positions plays a crucial role in separating and transporting charge carriers. Herein, ZIF-8 and urea are used as precursors to prepare hierarchically porous ZnO/g-C3N4 S-scheme heterojunction photocatalysts through a two-step calcination method. This S-scheme heterojunction photocatalyst shows high activity toward photocatalytic H2O2 production, which is 3.4 and 5.0 times higher than that of pure g-C3N4 and ZnO, respectively. The mechanism of charge transfer and separation within the S-scheme heterojunction is studied by Kelvin probe, in situ irradiated X-ray photoelectron spectroscopy (ISI-XPS), and electron paramagnetic resonance (EPR). This research provides an idea of designing S-scheme heterojunction photocatalysts with hierarchical pores in efficient photocatalytic hydrogen peroxide production.
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JOURNAL OF MOLECULAR STRUCTURE
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2021
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IF 3.196
Dandan Liu,Haiou Liang,Tong Xu,Jie Bai,Chunping Li
Through a simple fiber template method, we combined the n-type TiO 2 catalysts with n-type ZnS@ZnO heterojunction to synthesize a high-efficiency ternary hollow TiO 2 -ZnS@ZnO n-n heterojunction. Under these modified conditions, the composite catalysts could broaden the visible light absorption range of the pure TiO 2 , and both the hollow structure and heterojunction could inhibit the recombination ability of the photon-generated carriers. Optical and Electrochemical characterizations indicated that the photogenerated electrons and holes can be separated efficiently and the composites have visible light absorption. The experimental results show that, the removal efficiency of the optimal composites for photocatalytic degradation of Tetracycline Hydrochloride (TC) under visible light ( λ ≥ 420 nm) was 86.67% due to the ·O 2 − free radicals of efficient production, it exhibited 5 times higher degradation rate towards Tetracycline Hydrochloride (TC) than pure TiO 2 . The composites with high photocatalytic activity could also effectively degrade Methylthionine Chloride (MB), Xylenol Orange (XO), Acid Red 18 and Rhodamine B (RhB) under the driving of visible light. This work provided a simple method to construct ternary heterojunction, and also provided a promising strategy to solve the environmental pollution problem in the future.
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Nanotechnology Reviews
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2021
·Vol. 10
·期 1
·919-932
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IF 7.848
Jiahao Hu,Jie Ding,Jianping Ai,Honglin Li,Shaozhi Li,Qingbo Ma,Lihui Luo,Xiaoling Xu
In this article, the flower-like, urchin-like, and rod-like ZnOs were synthesized by a convenient atmospheric hydrothermal method. The crystalline structures, morphologies, exposed crystal faces, and specific surface areas of the as-prepared ZnO samples were analyzed. Rhodamine B (RhB) was used as the simulated pollutant to evaluate the photocatalytic performance of the ZnO nanostructures. The flower-like ZnO prepared by controlled hydrothermal method at room temperature for 2 h displayed highest specific surface area and exposed more high active
{
2
1
¯
1
¯
0
}
facets compared to the other two morphologies of ZnO. In addition, within 2 h of the photocatalytic reaction, the flower-like ZnO results in 99.3% degradation of RhB and produces the most hydroxyl radicals (˙OH) 47.83 μmol/g and superoxide anions (˙
O
2
−
) 102.78 μmol/g. Due to the existence of oxygen vacancies on the surface of
{
2
1
¯
1
¯
0
}
facets, the flower-like ZnO can efficiently catalyze the production of active oxygen, leading to the improvement in the photocatalytic efficiency.
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DIAMOND AND RELATED MATERIALS
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2021
·
IF 3.315
Jiao Wu,Jingyu Hu,Honghong Qian,Jianjun Li,Ran Yang,Lingbo Qu
The Nickel‑cobalt alloys/zinc oxide/graphitic carbon nitride (NiCo/ZnO/g-C 3 N 4 , NCZg) nanocomposites , magnetic Z-scheme heterojunction nanoparticles , were successfully synthesized. A series of characterization techniques were used to study the morphologies, chemical compositions and optical properties of the prepared NCZg. Using oxytetracycline (OTC) and tetracycline (TC) as target contaminants, the visible light degradation activity of NCZg nanocomposites was investigated. Under visible light, NCZg showed high photocatalytic degradation activity. The photocatalytic degradation rates of OTC and TC reached 71.3% and 81.29% in 50 min. The photocatalytic degradation efficiency of NCZg was obviously better than other materials reported in literatures. The capture experiments of reactive species showed that photogenerated holes (h + ) were the primary reason of photocatalytic degradation. This study provides a novel idea for the construction of high-performance photocatalyst for the degradation of OTC.
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ACS Sensors
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2021
·
IF 7.711
Wenjun Yan,Huoshu Xu,Min Ling,Shiyu Zhou,Tong Qiu,Yanjun Deng,Zhidong Zhao,Erpan Zhang
Trimethylamine (TMA) sensors based on metal oxide semiconductors (MOS) have drawn great attention for real-time seafood quality evaluation. However, poor selectivity and baseline drift limit the practical applications of MOS TMA sensors. Engineering core@shell heterojunction structures with accumulation and depletion layers formed at the interface is regarded as an appealing way for enhanced gas sensing performances. Herein, we design porous hollow Co3O4@ZnO cages via a facile ZIF-67@ZIF-8-derived approach for TMA sensors. These sensors demonstrate great TMA resistive sensing performance (linear response at moderate TMA concentrations (<33 ppm)), and a high sensitivity of ∼41 is observed when exposed to 33 ppm TMA, with a response/recovery time of only 3/2 s. This superior performance benefits from the Co3O4@ZnO porous hollow structure with maximum heterojunctions and high surface area. Furthermore, great capacitive TMA sensing with linear sensitivity over the full testing concentration range (0.33–66 ppm) and better baseline stability were investigated. A possible capacitive sensing mechanism of TMA polarization was proposed. For practical usage, a portable sensing prototype based on the Co3O4@ZnO sensor was fabricated, and its satisfactory sensing behavior further confirms the potential for real-time TMA detection.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Shujie Cai,Haotian Wang,Jun Tang,Xiufeng Tang,Peng Guan,Jiuyu Li,Yuji Jiang,Yonghong Wu,Renkou Xu
The increasing use of nanoparticles (NPs) has raised concerns about their potential environmental risks. Many researches on NPs focused on the toxicity mechanism to microorganisms , but neglect the toxicity effects in relation to nutritional conditions. Here, we evaluated the interactive effects of zinc oxide (ZnO) NPs and phosphorus (P) levels on the bacterial community and functioning of periphytic biofilms. Results showed that long-term exposure to ZnO NPs significantly reduced alkaline phosphatase activity (APA) of periphytic biofilms just in P-limited conditions. Co-occurrence network analysis indicated that ZnO NPs exposure reduced network complexity between bacterial taxa in P-limited conditions, while the opposite trend was observed in P-replete conditions. Correlation analysis and random forest modeling suggested that excessive Zn 2+ released and high reactive oxygen species (ROS) production might be mainly responsible for the inhibition of APA induced by ZnO NPs under P-limited conditions, while adjustment of bacterial diversity and improvement of keystone taxa cooperation were the main mechanisms in maintaining APA when subjected to weak toxicity of ZnO NPs in P-replete conditions. Taken together, our results provide insights into the biological feedback mechanism involved in ZnO NPs exposure on the ecological function of periphytic biofilms in different P nutritional conditions.
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TEXTILE RESEARCH JOURNAL
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2021
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IF 1.82
Mengmeng Li,Amjad Farooq,Shuai Jiang,Meiling Zhang,Hassan Mussana,Lifang Liu
A simple impregnation method was employed to obtain functional cotton fabric based on a zinc oxide (ZnO) and cellulose nanocomposite. The cellulose nanofibril suspension was utilized to reduce the agglomeration of ZnO nanoparticles (ZnO NPs) and bind them to the surface of the fiber. Scanning electron microscopy and inductively coupled plasma mass spectrometry were used to confirm the presence of ZnO NPs on the surface of the fiber. The treated cotton fabrics exhibited high ultraviolet protection factor values, which were still higher than 50 even after 30 standard washing cycles. Furthermore, the treated samples showed a modest antibacterial effect due to the presence of ZnO NPs. Meanwhile, the treated cotton fabrics showed a decrease (less than 30%) in air permeability.
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MATERIALS CHEMISTRY AND PHYSICS
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2021
·
IF 4.094
Yaping Li,Xianglin Sun,Yiming Tang,Yun Hau Ng,Lintao Li,Feng Jiang,Jing Wang,Weirui Chen,Laisheng Li
The coral-like BiVO 4 was successfully constructed on ZnO nanorods grown on FTO substrates to reveal exceptional photoinduced charge migration kinetics as well as the underlying photoelectrocatalytic degradation process. The orderly ZnO nanorods array accelerated the separation of photogenerated carriers, while the three-dimensional coral structure of ZnO/BiVO 4 nanocomposite increased the efficiency of light absorption and mass transfer, thus improving the photoelectrochemical properties. Fine interfacial contact between ZnO and BiVO4 led to the optimized photoelectrochemical performance with a photocurrent density of 0.29 mA/cm2 at 0 V vs . Ag/AgCl under visible light illumination (λ ≧ 420 nm), which was 3.2 times, 1.6 times of that of pristine ZnO and BiVO4. Moreover, the photoelectrocatalytic degradation efficiency of tetracycline from the ZnO/BiVO4 nanocomposite on was c. a. 84.5% and the main degradation paths were analyzed by LC-MS. Radical scavengers were employed to evaluate the capability to produce •O 2 − and •OH active species upon visible light illumination. This study elucidated the reaction mechanisms of the ZnO/BiVO4 nanocomposite during the photoelectrocatalytic degradation process.
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Molecular Catalysis
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2021
·
IF 5.062
Tianqinji Qi,Weizuo Li,Hong Li,Ke Ji,Shaoyun Chen,Yongchun Zhang
Revealing the origin of the enhanced performance on yttria (Y 2 O 3 ) promoted Cu/ZnO based catalyst for methanol synthesis via CO 2 hydrogenation is still challenging. To shed light upon the promotion effect of Y 2 O 3 modifier on binary Cu/ZnO catalyst for CO 2 hydrogenation reaction, a ternary Cu/ZnO/Y 2 O 3 catalyst was synthesized via a citric acid coordination-assisted strategy. The developed Cu/ZnO/Y 2 O 3 catalyst exhibited a remarkably higher Weight-time yeild of methanol (236.8 g MeOH g cat −1 ∙ h − 1 ) and methanol selectivity (81.1%) in comparison to Cu/ZnO catalyst (159.6 g MeOH g cat −1 ∙ h − 1 and 73.9%, respectively). Various characterizations results have uncovered the enhanced catalytic activity of Cu/ZnO/Y 2 O 3 catalyst for methanol synthesis was associated with small size and highly dispersed Cu species and abundant surface adsorption sites as well as more Cu-ZnO interfaces with strong interaction. Moreover, the Cu/ZnO/Y 2 O 3 catalyst displayed a superior weight-time yield of methanol with a time-on-stream of 100 h in comparison with classic Cu/ZnO catalyst. We anticipate that this basic design strategy will provide a novel alternative to expand opportunities to explore scalable, cost-effective catalysts for industrial methanol synthesis.
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EUROPEAN POLYMER JOURNAL
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2020
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IF 3.862
Farah Naz,Matteo Ciprian,Bibimaryam Mousavi,Somboon Chaemchuen,Meifang Zhu,Shilin Yan,Francis Verpoort
For the first time, ZnO dispersed in an N-doped carbon matrix (ZnO/NCs) was derived from the controlled thermal treatment of Zn-DABCO and utilized as a robust heterogeneous catalyst for the polymerization of ε-caprolactone. The as-prepared ZnO/NCs catalysts were characterized using TEM, SEM, Raman spectroscopy, XPS, XRD, TPD and N 2 adsorption. The catalyst displayed excellent activity towards the ε-caprolactone polymerization reaction, following the trend, Zn/NC-1000 < Zn/NC-800 < Zn/NC-600. The polymerization was catalyzed co-operatively by both acid and basic sites present in the ZnO/NCs, leading to high molecular weight cyclic polycaprolactone (c-PCL). Furthermore, the catalyst retained its stability and activity after being used for seven cycles without showing any significant loss in performance.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 2
·1643-1657
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IF 3.553
Tian Xuwang,Ge Xiaohui,Guo Mengya,Ma Jinxia,Meng Zhiqian,Lu Peng
Abstract Pickering emulsion templating has become an effective method for preparing polymer foam with precise morphology. The present study reports an antibacterial foam prepared through the polymerisation of acrylated epoxidised soybean oil (AESO) in the external phase of a water-in-oil (w/o) Pickering emulsion. Zinc oxide (ZnO) was used to stabilise water into the AESO and endow the resulting foam with antimicrobial characteristics. The effects of the oil-to-water mass ratio (3:1–1:2) and ZnO concentration (0.1–3.0 wt%) on the stability of the emulsion were studied. The emulsions were characterised in terms of the volume fraction of the emulsion phase, the viscosity of the emulsion, and the interfacial tension. The emulsion prepared with an oil-to-water ratio of 3:2 and ZnO concentration of 1.0 wt% showed strong stability. Absorption of ZnO at the oil–water interface was observed by using graphene oxide quantum dot-doped ZnO as a fluorescent marker. Antibacterial foam was formed by heating the Pickering emulsion at 120 °C for 3 h. Scanning electron microscope images show that the foam has a closed-cell structure with an average pore diameter of approximately 200 μm. The prepared foam showed antibacterial activity with an inhibition rate against E.coli of 99%. The production of a porous polymer from sustainable materials through ZnO-stabilised Pickering emulsion templating provides a facile method for preparing innovative, functional bio-based materials. Graphic abstract
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危险品化学品经营许可证（带存储）