DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Mingxia Tian,Guyu Zhang,Xinlei Zhao,Yumin Yan,Jianbo Zhao,Hui Bai,Jianhui Jiang
Herein, Nd-ZnO/g-C 3 N 4 (NZCN) composites were obtained by doping rare-earth element Nd with ZnO using a hydrothermal method , coupled with g-C 3 N 4 (CN) electrostatic ultrasonic self-assembly. The NZCN composite exhibited an impressive methylene blue (MB) removal rate of 94.88 %, with a degradation rate of 0.02637 min −1 after 105 min exposure to 500 W xenon lamp irradiations. Comparatively, the degradation rate of MB by the NZCN composite was five and twice times higher than ZnO and CN samples, respectively. This significant improvement can be attributed to the synergistic effect of Nd, ZnO, and CN, which not only widened the light absorption range but also enhanced the density, separation, and transport of photogenerated electrons (e − ) and holes (h + ), thus improving the photocatalytic performance of the NZCN composites. An in-depth investigation into the photocatalytic reaction process was carried out using free-radical active-species capture experiments, confirming the critical role of h + . Furthermore, the reproducibility and stability of the NZCN composites were assessed over five experimental cycles, demonstrating consistent and stable MB degradation rates of 90.1 % while retaining the crystal structure unchanged. Overall, the construction of rare-earth-metal-doped ZnO and Z-type heterojunctions synergistically improves photocatalytic activity and provides a green and environmentally friendly approach for the removal of organics from wastewater.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2021
·Vol. 19
·期 1
·1-19
·
IF 10.435
Li Yuzhan,Liang Luxin,Li Wu,Ashraf Umair,Ma Lin,Tang Xiangru,Pan Shenggang,Tian Hua,Mo Zhaowen
Background Cadmium (Cd) is amongst the most toxic heavy metals that severely affects crop growth, whereas application of nanoparticles (NPs) to negate the toxic effects of heavy metals could be an effective management approach. In the present study, the seeds of two fragrant rice varieties i.e., Yuxiangyouzhan and Xiangyaxiangzhan under normal and Cd stress conditions i.e., 0 and 100 mg L− 1 applied with four levels of ZnO NPs i.e., 0, 25, 50, and 100 mg L− 1.Results Seed priming with ZnO NPs had no significant effect on the seed germination (p > 0.05) however, it substantially improved the seedling growth and other related physiological attributes under the Cd stress. The mean fresh weight of the shoot, and whole seedling was increased by 16.92–27.88% and by 16.92–27.88% after ZnO NPs application. The root fresh weight, root-shoot length was also substantially improved under ZnO NPs treatment. Moreover, application of ZnO NPs induced modulations in physiological and biochemical attributes e.g., the superoxide dismutase (SOD) activity in root and shoot, the peroxidase (POD) activity and metallothionein contents in root were increased under low levels of ZnO NPs. The α-amylase and total amylase activity were improved by ZnO NPs application under Cd Stress. Besides, modulation in Zn concentration and ZnO NPs uptake in the seedling were detected. The metabolomic analysis indicated that various pathways such as alanine, aspartate and glutamate metabolism, phenylpropanoid biosynthesis, and taurine and hypotaurine metabolism were possibly important for rice response to ZnO NPs and Cd.Conclusion Overall, application of ZnO NPs substantially improved the early growth and related physio-biochemical attributes in rice. Our findings provide new insights regarding the effects of ZnO NPs on seed germination, and early growth of rice, and its potential applications in developing crop resilience against Cd contaminated soils.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER TESTING
·
2021
·
IF 4.282
Jianqi Yao,Faliang Luo,Jie Mao,Yuting Li,Yongdong Liu,Xiaolei Sun
Different crystal planes of nanocrystalline often displayed diverse physical and chemical properties. In this paper, the effects of nano-ZnO with two kinds of crystal planes on crystallization, thermal stability and mechanical properties of PLLA were investigated. The results show that the (1010) planes with no-polar and low surface energy increased the chain mobility of PLLA chain, showed a plasticizing effect; the glass transition temperature, melt and cold crystallization temperature decreased by 12 °C, 10 °C and 12 °C, respectively. The size of spherulites increased and the number of spherulites decreased, the crystal form changed from mixed crystal form α, α′ to unique α crystal form. However, the (0002) planes with polar and high surface energy has highly nucleating effective for PLLA, the crystallization temperature increased to 106.41 °C, the cold crystallization peak disappear. The size of spherulites decreased and the number of spherulites increased. Moreover, the (0002) planes increases the elongation at break of PLLA to 20.34% but the (1010) planes reduces to 7.49%. Their thermo-gravimetric analysis results showed the similar trend. Our results indicate that the interface wettability and compatibility between crystal planes and PLLA, which was caused by the polarity and surface energy of (1010) or (0002) planes played key role in improving the performance of polymers.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Qingming Meng,Wenna Liu,Juan Jiang,Xinle Zhang
CuO/ZnO p-n heterojunction nanofibers were fabricated by coupling p-type CuO with n-type ZnO nanofibers for efficacious elimination of pyridine in fuel oil. The structural and photoelectric characteristics of the as-synthesized nanofibers were systematically studied. The photodegradation system was appropriate for the oxidation of pyridine from fuel oil utilizing the ambient air without mixing with other oxidants. Under visible light illumination, more than 90% of the pyridine (100 mL, 100 μg/g) could be degraded within 60 min by 17.5 mg of MCuZn-0.5 (the photocatalyst with a Cu/Zn molar ratio of 0.5 at%). The visible-light-induced photocatalytic denitrification efficiency of the MCuZn-0.5 nanofibers was nearly 1.5 times as high as that of ZnO alone. The superior denitrification activity of p-CuO/n-ZnO heterojunction nanofibers could be attributed to the enhanced optical absorption capacity and efficacious separation of photoexcited charge pairs. In addition, five-cycle experiments confirmed that MCuZn-0.5 nanofibers also displayed satisfactory photocatalytic denitrification properties. Mechanistic investigations proposed that the photoexcited holes played a dominant role in the formation of reactant intermediates, while superoxide radicals promoted the ultimate mineralization process of pyridine.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Guang-Li Zhang,Chao-Feng Pan,Yan-Hui Sun,Jing-Lan Wei,Dong-Cai Guan,Jun-Min Nan
In order to improve the electrochemical performance and relieve volume expansion of pure SnFe 2 O 4 anode for lithium-ion batteries (LIBs), we synthesized a novel ZnO/SnFe 2 O 4 /nitrogen-doped carbon composites (ZSFO/NC) with flake-like polyhedron morphology by using ZIF-8 as a sacrificial template. Remarkably, it exhibited an initial charge/discharge capacities of 1078.3/1507.5 mAh g −1 with a high initial coulombic efficiency (ICE) of 71.2%, and maintained a steady charge/discharge capacities of 1495.7/1511.8 mAh g −1 at 0.2 A g −1 after 300 cycles. The excellent rate performance of 435.6 mAh g −1 at a higher current density of 10.0 A g −1 and superior reversible capacity of 532.3/536.2 mAh g −1 after 500 cycles at 2.0 A g −1 were obtained. It revealed that the nitrogen-doped carbon matrix and peculiar structure of ZSFO/NC not only effectively buffered large volume expansion upon (de)lithiation through the synergistic interface action between ZnO, SnFe 2 O 4 and NC, but also improved capacity of the composite by large contribution of surface pseudo-capacitance. The excellent charge–discharge performance showed that ZSFO/NC composite has a great potential for LIBs due to the synergistic effect of the multi-components.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Tingting Zhang,Xuan Zhu,Jianhua Guo,April Z. Gu,Dan Li,Jianmin Chen
Nano-ZnO, as a commonly used nanomaterial, has been found in drinking water, food, and medicine; therefore, it poses potential health risks via the digestion system. However, little is known about the toxicity of nano-ZnO on the human intestinal microbiome, which plays critical roles in human health. This study comprehensively investigated the impact of nano-ZnO on the human gut microbiome, metabolic functions, and resistome using an in vitro colon simulator. Nano-ZnO induced concentration-dependent decreases in the production of short-chain fatty acids (SCFAs). Metagenomic analysis revealed that nano-ZnO not only led to dose-dependent shifts in the composition and diversity of the gut microbiota but also changed the key functional pathways of the gut microbiome. Although the diversity of the gut microbiota basically recovered after stopping exposure to nano-ZnO, SCFAs still showed a concentration-dependent decrease. Furthermore, although a medium concentration of nano-ZnO (2.5 mg/L) reduced the abundance of many antibiotic resistance genes (ARGs) by inhibiting the growth of related host bacteria, a low concentration of nano-ZnO (0.1 mg/L) greatly enriched the abundance of tetracycline resistance genes. Our findings provide evidence that nano-ZnO can impact the diversity, metabolism, and functional pathways of the human gut microbiome, as well as the gut resistome, highlighting the potential health effects of nanoparticles.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Xin Li,Haichao Li,Xiaoyu Wang,Duxin Xu,Tingting You,Yuying Wu,Feng Xu
Nano-ZnO were in situ prepared and permanently embedded in regenerated cellulose (RC) films by chemical precipitation to endow antibacterial of films and simultaneously strengthen tensile strength . ZnCl 2 was selected as a promoter of 1-allyl-3-methylimidazolium chloride for cellulose dissolution and as a precursor for nano-ZnO synthesis. Zn 2+ -absorbed cellulose solution was reacted with NaOH under ultrasonic to obtain nano-ZnO embedded RC films. The results indicated that RC films treated with the longest sonication time, highest regeneration solution basicity, and highest cellulose concentration were demonstrated to be the most effective against S. aureus , which agreed well with the dense and homogeneous distribution of high content of nano-ZnO on the film surface. The nanocomposite films achieved particularly high mechanical strength of 202.0 MPa with improved thermal stability . Strong H-bonding formed between nano-ZnO and cellulose, which contributed to high tensile strength and thermal stability of films. This work affords a simple approach to prepare cellulose nanocomposite with outstanding performance for potential application in packaging.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2020
·
IF 8.821
Meng Zhou,Qiming Yan,Qi Fu,Heqing Fu
The combination of microwave absorption performance and self-healing function is of great practical significance. In this paper, first, ZnO@MWCNTs nanoparticle is prepared by loading Zinc oxide (ZnO) on the surface of the multiwalled carbon nanotubes (MWCNTs) as microwave absorbers. Then, the thermoreversible self-healing DA-PDMS is prepared by using polydimethylsiloxane (PDMS) as raw material based on Diels-Alder (DA) reaction. Finally, a kind of novel multifunctional ZnO@MWCNTs/DA-PDMS nanocomposite with self-healing and microwave absorption properties is synthesized with the addition of ZnO@MWCNTs nanoparticle. When the cracked ZnO@MWCNTs/DA-PDMS nanocomposite is maintained at 120 °C for 10 min, it can recover more than 90% of the original mechanical strength . Even after three healing cycles, the ZnO@MWCNTs/DA-PDMS nanocomposite also displays excellent healing efficiency (about 90%). On the other hand, when the content of ZnO@MWCNTs nanoparticle is 10 wt%, ZnO@MWCNTs/DA-PDMS nanocomposite exhibits an effective absorption bandwidth from 8.2 to 12.4 GHz (full X-band) at a thickness of 3 mm and the minimum reflection loss of −20.1 dB. Even after the 3rd healing cycle, the minimum reflection loss of the healed samples can still maintain −20.0 dB at a thickness of 3 mm. ZnO@MWCNTs/DA-PDMS nanocomposite will have good development prospect in the field of intelligence and microwave absorption materials .
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 8
·2343-2352
·
IF 5.721
Ziheng Zhen,Wenxiang Tang,Wei (Willy) Chu,Tao Zhang,Li Lv,Shengwei Tang
The dispersity and the neighboring degree of different sites play crucial roles in the catalytic performance of dual site catalysts. The solution of precursors was encapsulated into microdroplets by forming a microemulsion. The average diameter of microdroplets was about 45 nm. This guaranteed that the dosage of precursors was at the attogram level and only about a thousand precursor molecules were encapsulated in each microdroplet. An anti-solvent extraction method was applied to extract water from the microdroplets with acetonitrile. The precursors co-precipitated in the microdroplets due to the loss of water. The encapsulated precursors in the microdroplets co-precipitated together in nanoscale space, so the neighboring degree of the two precursors was improved significantly. The prepared catalyst was characterized by ICP-OES, BET, XRD, H2-TPR, TEM and XPS. Compared with the Cu–ZnO/Al2O3 (CZA) catalysts prepared by the conventional impregnation method, the CZA catalysts prepared by the proposed strategy had much stronger interaction and a better neighboring degree of the dual active sites. They also showed very good catalytic performance for the reverse water gas shift (RWGS) reaction. The CO2 conversion of the designed CZA catalysts was about 1–2 times higher than that of the CZA catalysts prepared by the conventional impregnation method at 0.1 MPa, 300–400 °C and a CO2/H2 mole ratio of 1.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yinan Gu,Guixiang Teng,Xiaodong Jin,Liping Wang,Zengwei Qiang,Weigang Ma,Chun Zhang
A coral-like ZnO/C-ZnFe2O4 (Z/C-ZFO) photocatalyst was synthesized by simulating the structural characteristics of coral since its structure is conducive to the capture and absorption of light. The synthesis process involves a two-step process. First, flowerlike hierarchical precursors were synthesized through a hydrothermal self-assembled route. Next, the precursors were thermally annealed in a nitrogen atmosphere after doping with a zinc source. In addition to forming heterojunctions that enhance its photocatalytic properties, the coral-like nanostructures endowed Z/C-ZFO with significant light-harvesting efficiency. Finally, the photocatalyst was used for antibacterial applications against Escherichia coli and Staphylococcus aureus bacteria. The results showed that the optimized sterilization efficiencies toward E. coli and S. aureus bacteria were 99.4 and 98.0%, respectively, combined with excellent cycling stability. The method of designing and synthesizing coral-like structures in this study may also be extended to the synthesis of other photocatalytic and optical materials.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2020
·
IF 6.146
Pengfei Zhu,Xiaohe Yin,Xinhua Gao,Guohui Dong,Jingkun Xu,Chuanyi Wang
The controlled introduction of oxygen vacancies (OVs) in photocatalysts has been demonstrated to be an efficient approach for improving the separation of photogenerated charge carriers, and thus, for enhancing the photocatalytic performance of photocatalysts. In this study, a two-step calcination method where ZIF-8 was used as the precursor was explored for the synthesis of ZIF-8-derived ZnO nanoparticles with gradient distribution of OVs. Electron paramagnetic resonance measurements indicated that the concentration of OVs in the samples depended on the temperature treatment process. Ultraviolet–visible spectra supported that the two-step calcined samples presented excellent light-harvesting ability in the ultraviolet-to-visible light range. Moreover, it was determined that the two-step calcined samples presented superior photocatalytic performance for the removal of NO , and inhibited the generation of NO 2 . These properties could be attributed to the contribution of the OVs present in the two-step calcined samples to their photocatalytic performance. The electrons confined by the OVs could be transferred to O 2 to generate superoxide radicals, which could oxidize NO to the final product, nitrate. In particular, the NO removal efficiency of Z 350-400 (which was a sample first calcined at 350 °C for 2 h, then at 400 °C for 1 h) was 1.5 and 4.6 times higher than that of Z 400 (which was one-step directly calcined at 400 °C) and commercial ZnO, respectively. These findings suggested that OV-containing metal oxides that derived from metal-organic framework materials hold great promise as highly efficient photocatalysts for the removal of NO.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Xiuzhen Zheng,Zhuo Zhang,Sugang Meng,Yaxiao Wang,Danzhen Li
Plasmonic photocatalytic degradation and photoelectrochemical water splitting is very promising in the process of ecological environment protection. However, the efficiencies reported are still too low for practical application due to the high recombination of photogenerated electrons and holes, which can be improved by optimizing the design and assembly of highly ordered pore structures. In our work, a composite plasmonic metal/semiconductor photocatalyst, Au/ZnO hybrid inverse-opal nanomaterial (Au/ZnO-IO), was prepared by in-situ grown Au nanoparticles on inner and outer of ZnO framework. The 3D ordered Au/ZnO-IO photocatalyst exhibited excellent photocatalytic activity in bisphenol A degradation and photoelectrochemical water splitting. The improved photoactivities were proved to be caused by the increased light absorption and special charge transfer of photogenerated electrons, which significantly restraint the recombination rate and prolong the lifetime of photoexcited carries. Based on the analysis of active species experiments, photoelectrochemical measurements, energy level of schottky junction and finite-difference time-domain (FDTD) simulations, the degradation mechanism on Au/ZnO-IO nanocomposite was supposed. This work provides insights into the charge transfer regulation by constructing the 3D plasmonic metal/semiconductor inverse-opal photocatalyst and may serve as a promising strategy for photocatalytic degradation of organic pollutants and water splitting.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）