POLYMER
·
2025
·
IF 4.5
Zhanjian Liu,Ping Wang,Jing Jing,Meiling Li,Yuxin Fu,Xiguang Zhang,Huaiyuan Wang
Superwetting oil-water separation membranes are effective materials for treatment of wastewater containing emulsified oil, but the problem of membrane pollution remains a huge challenge during its long-term operation. In this study, we successfully developed a superhydrophilic/underwater superoleophobic membrane using a simple phase separation method. The fabrication process involved three key steps: (1) surface hydroxylation of pristine PVDF using NaOH etching to generate active hydrogen bonds and hydroxyl groups, (2) acrylic acid (AA) grafting onto the hydroxylated PVDF surface to introduce carboxyl functionalities, and (3) in-situ chelation of needle-like ZnO onto the AA-grafted matrix. The synergistic effect of the surface needle-like ZnO and the hydration layer endowed the PVDF-OH/AA@ZnO membrane with an outstanding oil-water separation efficiency of n-hexane up to 99.68 %, and higher than 98 % for various emulsions (e.g. kerosene, petroleum ether, chloroform, and dichloromethane) under gravity. Moreover, compared with the basement membrane, the tensile strength of the modified membrane increased from 106.21 kPa to 153.84 kPa, indicating its excellent mechanical properties under strong external forces. The PVDF-OH/AA@ZnO membrane demonstrated exceptional recycling performance, with a separation efficiency above 97.25 % after five cycles, and exhibited anti-fouling capability with simple water rinsing used to remove surface oil residues. Overall, this study provides a scalable strategy for the design of superhydrophilic/underwater superoleophobic separation membranes for the practical treatment of oily wastewater.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2017
·Vol. 24
·期 14
·3481-3487
·
IF 5.317
Bo Chen,Chan Zhang,Libo Niu,Xiaozhen Shi,Huiling Zhang,Xingwang Lan,Guoyi Bai
Graphical Extra support : Ultrasmall ZnO nanoparticles anchored on N-doped carbon atoms with a silica support (ZnO/SiO 2 -NC) have been fabricated by using a self-assembly strategy with chitosan as a precursor. An average size of 2.55 nm for the ZnO nanoparticles was obtained, helped by the interaction between the zinc ions and the hybrid support (see the figure). Ultrasmall ZnO nanoparticles anchored on N-doped carbon materials with a silica support (ZnO/SiO 2 -NC) were fabricated from chitosan and metal ions by using a one-pot self-assembly strategy and were successfully applied to the synthesis of 2-arylbenzimidazoles under mild conditions. These catalysts showed excellent stability and could be used six times without any loss of conversion and selectivity. The use of silica gel and the biomass chitosan as a source of hydrophilic N-doped carbon materials facilitated the uniform dispersion of the ZnO nanoparticles in methanol and therefore the contact of these nanoparticles with reactants, thus contributing to a high catalytic performance. TEM analysis showed that the ZnO nanoparticles were around 2.55 nm in diameter and uniformly distributed on the support surface. The binding behavior of ZnO and N-doped carbon materials affected the catalytic activity. Interestingly, temperature-programmed NH 3 desorption indicated that the interactions between ZnO and N-doped carbon materials might induce the presence of more acidic sites in these catalysts, thus resulting in enhanced activity and hence promoting this transformation.
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高影响因子
Polymers
·
2024
·Vol. 16
·期 17
·2483
·
IF 4.7
Lei Xu,Jiao Lv,Shengrui Yu
Conductive multi-walled carbon nanotubes (MWCNTs) as well as piezoelectric zinc oxide (ZnO) nanoparticles are frequently used as a single additive and dispersed in polyvinylidene fluoride (PVDF) solutions for the fabrication of piezoelectric composite films. In this study, MWCNT/ZnO binary dispersions are used as spinning liquids to fabricate composite nanofibrous films by electrospinning. Binary additives are conducive to increasing the crystallinity, piezoelectric voltage coefficient, and consequent piezoelectricity of as-spun films owing to the stretch-enhanced polarization of the electrospinning process under an applied electric field. PCZ–1.5 film (10 wt. % PVDF/0.1 wt. % MWCNTs/1.5 wt. % ZnO nanoparticles) contains the maximum β-phase content of 79.0% and the highest crystallinity of 87.9% in nanofibers. A sensor using a PCZ–1.5 film as a functional layer generates an open-circuit voltage of 10 V as it is subjected to impact loads with an amplitude of 6 mm at 10 Hz. The piezoelectric sensor reaches a power density of 0.33 μW/cm 2 and a force sensitivity of 582 mV/N. In addition, the sensor is successfully applied to test irregular motions of a bending finger and stepping foot. The result indicates that electrospun PVDF/MWCNT/ZnO nanofibrous films are suitable for wearable devices.
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高影响因子
Materials Today Energy
·
2024
·
IF 9
K.S. Chandrakantha,Z. Zuo,B.N. Chandrashekar,A. Amini,K.S. Rangappa,S. Srikantaswamy,C. Cheng
A composite catalyst, zinc-doped laser-reduced graphene oxide (LrGO), is synthesized with highly dispersed molybdenum disulfide (MoS 2 ) nanolayers using laser exfoliation followed by a hydrothermal process. The resultant LrGO–ZnO/1T–2H MoS 2 (GZM3) catalyst exhibits enhanced hydrogen evolution reaction (HER) catalytic performance and improved stability. It achieves small overpotentials of 94 and 191.5 mV at a current density of 10 mA cm −2 , under acidic and alkaline conditions, respectively. This superior catalytic activity is attributed to the high electrical conductivity and large electrochemical surface area of graphene, along with efficient charge transfer facilitated by Zn ions between LrGO–ZnO and 1T–2H MoS 2 .
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Bin Du,Haoran Ye,Yincheng Wang,Ming Shen,Hui Zhou
The limited optical adsorption range and rapid recombination of photoexcited electron-hole pairs have severely hindered the development of ZnO-based photocatalysts . As macromolecular compounds, calixarenes become potential photocatalyst modifiers owing to their special molecular structures. In this work, ZnFe 2 O 4 /ZnO heterojunction photocatalysts which consist of ZnFe 2 O 4 nanoparticles and ZnO nanosheets were fabricated by simple hydrothermal reaction with the introduction of tetrasulfonatomethyl-n-hexyl calix[4]resorcinarene tetrasodium (THCRT 1 ). The synthesized ZnFe 2 O 4 /ZnO nanocomposite possesses a larger specific surface area , broader-spectrum absorption and an electronegative surface due to the addition of THCRT. Furthermore, the successful construction of ZnFe 2 O 4 /ZnO heterojunction leads to low charge transfer resistance and enhanced photocurrent density. Therefore, the THCRT-capped ZnFe 2 O 4 /ZnO composite exhibited superior adsorptive performance and removal efficiency towards Rhodamine B (RhB) and Levofloxacin hydrochloride (LH). The calcined nanocomposite degraded 95.80 % of RhB (10 mg L −1 ) and 97.86 % of LH (20 mg L −1 ) after 120 min under simulated sunlight illumination at a minimal catalyst dosage of 0 .1 g L −1 . Additionally, to determine the band structures , the band gaps, valence band positions and the Fermi levels were measured by Tauc plot, valence band x-ray photoelectron spectroscopy (XPS-Vb) and Mott-Schottky plot, respectively. Finally, based on the band structure results, we proposed a potential photocatalytic mechanism of n-n heterojunction. This work offers a promising prospect in the treatment of sewage containing organic contaminants.
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高影响因子
Food Chemistry-X
·
2024
·
IF 6.5
Shuyang Sun,Wenteng Qiao,Feng Yin,Wei Mi,LuliangWang,Yuhan Jia,Mengjiao Wang,Xinhui Liu,Dacheng Wang,Daotan Liu,Chao Zhao,Xiuling Song,Yushen Liu,Yue Zhai
Food safety has emerged as a paramount concern in global health, prompting innovative approaches to ensure the safety of people's sustenance. In this study, a novel strategy was devised to fabricate Fe 3 O 4 -ZnO-MnO 2 hybrid nanobiocatalysts, which exhibited remarkable enzymatic activity surpassing that of Horseradish peroxidase (HRP) catalysis. It demonstrated exceptional proficiency in decomposing 3,3′,5,5′-tetramethylbenzidine (TMB) without the need for harsh reaction conditions or the aid of H 2 O 2 . We established colorimetric detection systems based on Fe 3 O 4 -ZnO-MnO 2 -TMB both for nitrite (NO 2 − ) and Listeria monocytogenes (LM) in food. Impressively, the detection limit of nitrite reached an astonishingly low level of 0.022 mg L −1 , and the detection limit for LM was determined to be 3.5 cfu mL −1 . These compelling results unequivocally validate the potential of these hybrid nanobiocatalysts to fortify food safety measures. Moreover, they serve as a valuable reference for the colorimetric detection of diverse analytes and the simultaneous detection of multiple targets.
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高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Ziwei Lv,Hongxu Liu,Jingxuan Zhao,Ruijia Wang,Ting Xie,Yuchao Qi,Yang Yu,Xue Lv,Shulin Sun
In this paper, PVDF-g-PNIPAAm/GEP-PDA@ZnO composite membranes that can undergo light-induced structural response and photodegradation to achieve self-cleaning have been designed and applied to the separation and purification of dye wastewater. The membranes were prepared by blending graphene (GPE)-polydopamine (PDA)-coated zinc oxide (ZnO) core–shell particles into the PVDF-g-PNIPAAm matrix with a non-solvent induced phase separation technique. The GPE and ZnO are tightly bonded by highly adhesive PDA to form a “strawberry-like” core–shell structure. GPE absorbs light energy and converts it into heat, resulting in changes in PNIPAAm chain segments to expand the pore size for self-cleaning. While the membrane is warming up, GPE further promotes the activation of active groups on the surface of PDA@ZnO at high temperature, resulting in unique and excellent photothermal catalytic activity. As a result, the membrane achieves both self-cleaning and pollutant degradation, which results in an FRR of 99.6% after light cleaning. Moreover, the GPE-PDA@ZnO nanoparticle-modified PVDF-g-PNIPAAm membranes exhibit excellent cycling stability with a degradation flux recovery rate of more than 97% even after multiple UV cleaning. Thus, PVDF-g-PNIPAAm/GPE-PDA@ZnO composite membranes extend the versatility of PVDF-based membranes and show extraordinary potential for application in wastewater treatment.
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Liusha Cen,Fan Yu,Shixue Liu,Chengcai Li,Wangyong Jin,Chenliang Wang,Hailin Zhu,Yuhai Guo
The technology that catalyst activated perxymosulfate (PMS) has been widely used in the decomposition of organic pollutants. We prepared Zn and Co-based ZIF and obtained C-doping Co 3 O 4 / ZnO heterojunction after pyrolysis. C-doping Co 3 O 4 / ZnO heterojunction with cage core-shell structure was loaded on the polyvinylidene fluoride (PVDF) membranes with a layered porous structure by solvent-assisted nanoparticle embedding (SANE) method, where the carmine degradation reached 99.6 % by MC-430 activated Perxymosulfate (PMS) within 10 min. The influencing factors (such as the pyrolysis temperature, PMS dosage, and dye concentration) on OFX degradation were observed, and MC-430 exhibited good tolerance for these factors and a wide range of solution hydrogen ion concentrations (pH= 4–10). The strong reusability and stability analysis showed that the carmine degradation of the MC-430/PMS system changed minorly (from 99.6 % to 97.7 %) in 5 consecutive cycles without any treatment. The degradation mechanism was confirmed by capture experiments, in which the non-free radical path was the main one and the free radical path was the auxiliary one. Moreover, structure characterizations and density functional theory calculations verified that doped C sites provided a channel for electron transfer from Zn sites to Co sites, which increased the generation rate of reactive oxygen species (ROS) and prolonged the catalyst life. This work provides a new method for the preparation of nonmetallic doping bimetallic strong coupling catalysis.
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高影响因子
SENSORS
·
2025
·Vol. 25
·期 14
·4480
·
IF 3.5
Yinzhong Liu,Xiaoshun Wei,Yun Guo,Lingchao Wang,Hui Guo,Qingjie Wang,Yiyu Qiao,Xiaotao Zhu,Xuechun Yang,Lingli Cheng,Zheng Jiao
Volatile organic compounds (VOCs) are presently posing a rather considerable threat to both human health and environmental sustainability. Among these, n-butanol is commonly identified as bringing potential hazards to environmental integrity and individual health. This study presents the creation of a highly sensitive n-butanol gas sensor utilizing cobalt-doped zinc oxide (ZnO) derived from a metal–organic framework (MOF). A series of x-Co/MOF-ZnO (x = 1, 3, 5, 7 wt%) nanomaterials with varying Co ratios were generated using the homogeneous co-precipitation method and assessed for their gas-sensing performances under a low operating temperature (191 °C) and UV excitation (220 mW/cm2). These findings demonstrated that the 5-Co/MOF-ZnO sensor presented the highest oxygen vacancy (Ov) concentration and the largest specific surface area (SSA), representing the optimal reactivity, selectivity, and durability for n-butanol detection. Regarding the sensor’s response to 100 ppm n-butanol under UV excitation, it achieved a value of 1259.06, 9.80 times greater than that of pure MOF-ZnO (128.56) and 2.07 times higher than that in darkness (608.38). Additionally, under UV illumination, the sensor achieved a rapid response time (11 s) and recovery rate (23 s). As a strategy to transform the functionality of ZnO-based sensors for n-butanol gas detection, this study also investigated potential possible redox reactions occurring during the detection process.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Dong Wentao,Zhang Mingguang,Peng Tao,Peng Yangyi,He Zanhua,Yao Daojin
With the rapid development of high-speed railway, real-time monitoring of operation safety becomes more and more crucial. However, power supply for microsensors in railway monitoring systems is still demanding and challenging. Stable energy to onboard sensing devices is essential to ensure the safe operation of rail transit systems. Herein, a hybrid piezoelectric–triboelectric nanogenerator (HPTG) is proposed to harvest the vibration energy on the bogie, which is also used as the self-powered sensing for continuous structural health monitoring (SHM) of train bogie. HPTG is designed and fabricated with polyvinylidene fluoride (PVDF)/zinc oxide (ZnO) composite and polydimethylsiloxane (PDMS) film. The experiment results demonstrate that incorporating ZnO simultaneously enhances piezoelectric and triboelectric outputs while improving the overall output performance of the device, fully realizing the synergistic effect of piezoelectric effect and triboelectric effect. Under the condition of external load, the maximum power of the hybrid output is 3.256 μW with excellent working stability. Through the integration of rectifier circuit and energy storage module, the microthermohygrometer is successfully driven. In addition, the feasibility of vibration energy harvesting of HPTG in the actual operating environment is further verified on the small-scale wheel rolling test bench, which provides a solution for the power supply problem of microelectronic equipment for train bogie monitoring, and can effectively help to develop the self-powered monitoring system of rail transit.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Xuemei Li,Qin Guo,Guanhua Jin,Jingmei Zhang,Biao Ma,Zeyang Zhu,Yu Zhang,Haitao Meng,Shouzhu Li,Quanlong Xu
Antibacterial fiber materials have found widespread use in textiles. However, conventional antibacterial fibers are typically polymer-based, which often results in a trade-off between flame retardancy and antibacterial activity. In this study, SiO 2 nanofibers (SiO 2 NFs) were first prepared using template-free electrospinning from a Si(OH) 4 solution without the use of polymers. Then, ZnO nanosheets were grown on the SiO 2 NFs matrix through a hydrothermal reaction under the synergistic effect of Cetyltrimethylammonium bromide (CTAB), which resulted in ZnO nanosheets/SiO 2 nanofibers (ZnO NSs/SiO 2 NFs) with both high antibacterial activity and flame retardant properties. This process enabled the controllable synthesis of ZnO nanosheets on SiO 2 NFs. The antibacterial rate of ZnO NSs/SiO 2 NFs against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) exceeded 99.90 %, owing to their unique morphological advantages, high active centers, and sufficient surface positive charge. Cytotoxicity tests confirmed that ZnO NSs/SiO 2 NFs exhibited no significant cytotoxicity and demonstrated good cell compatibility. Furthermore, ZnO NSs/SiO 2 NFs not only displayed excellent flame retardant properties but also maintained a 99.90 % antibacterial rate after continuous exposure to a flame for 10 min at 519.9°C (the alcohol lamp’s flame temperature). In addition, after 10 cycles of washing, ZnO NSs/SiO 2 NFs still maintained a 96.50 % antibacterial rate against E. coli and S. aureus , which demonstrated their excellent reusability. Therefore, a multifunctional pure inorganic nanofiber was developed, which exhibited strong biological activity, flame retardancy, antibacterial properties, and cycle stability. This research and development of antibacterial fibers laid a solid foundation for the further expansion of the antibacterial fabric market.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Jia Tang,Yuanwen Hou,Yuetian Yang,Hongquan Fu,Juan Zhang,Hejun Gao,Jinming Chang,Yunwen Liao
Hydrogen peroxide (H2O2) is a crucial industrial chemical with diverse applications, ranging from disinfection and bleaching to chemical synthesis and environmental remediation. However, conventional H2O2 production methods, such as the anthraquinone oxidation process, face significant challenges, including high energy consumption, environmental concerns, and reliance on hazardous chemicals. To address these issues, there is a growing need for the development of stable, green, and efficient production technologies. Piezoelectric catalysis has emerged as a cutting-edge solution, leveraging piezoelectric materials to convert mechanical energy into chemical energy. This process facilitates the charge separation necessary for redox reactions, offering a promising pathway for the clean and sustainable production of H2O2. In this study, S-type ZnO/Ag2O heterojunctions were synthesized using a precipitation method. This heterojunction demonstrated exceptional catalytic performance, achieving an impressive H2O2 production rate of 346.9 μmol g−1 h−1, surpassing many existing catalysts. A key breakthrough of this research lies in the dual reaction pathway mechanism of H2O2 production. Unlike traditional methods that rely on a single reaction pathway, the ZnO/Ag2O catalyst enables simultaneous H2O2 generation through both the water oxidation reaction (WOR) and the oxygen reduction reaction (ORR). This dual reaction pathway approach significantly enhances the overall yield. This study not only highlights the potential of piezoelectric catalysis as a high-performance method for H2O2 synthesis but also paves the way for further advancements in clean and sustainable chemical production.
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