SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Xiaodong Yang,Xuefei Yang,Zhiyong Hou,Minghui Li,Shuaiqi Luo,Jin Zhao,Kai Wang,Yuanxia Guo,Pengkai Sun,Fang Tan,Yan Yan,Lulu Liu,Lili Wang,Ye Han,Fanming Zeng,Andrew R. Zimmerman,Bin Gao
Antibiotics are of emerging concern due to their widespread use, lack of adequate treatment, and for their potential to threaten human health and the environment. Here, a facile fabrication approach for synthesizing ZnO/CuO-bentonite composites was investigated via carbon-bed pyrolysis of bentonite followed by ZnO/CuO co-precipitation. Sorbents were synthesized using a range of bentonite pyrolysis temperatures, metal oxide contents, and ZnO:CuO mass ratios. The ZnO/CuO-bentonite composites exhibited diverse functional groups, excellent mesoporosity, and high specific surface area (135.0 m 2 g −1 , four times that of pyrolyzed bentonite-only control). Ciprofloxacin removal was maximized at a bentonite pyrolysis temperature of 450 °C, a total metal oxide content of 25 %, and a Zn/Cu ratio between 95:5 and 93:7, and this material had an observed experimental CIP adsorption of 451 mg g −1 and a calculated maximum adsorption capacity of 1249.3 mg g −1 . This excellent CIP sorption ability was attributed to its abundant surface active sites and multiple sorption mechanisms, including hydrogen-bond interaction, ion exchange, and electrostatic interaction. These results illustrate that ZnO/CuO-bentonite composite sorbents have excellent potential for use in environmental remediation and water treatment applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Manman Mu,Lingqi Meng,Siting Ma,Wenjuan Chen,Xiaohong Yin,Guoyi Bai
Covalent organic frameworks (COFs) equipped with controllable porosity and excellent structural stability are regarded as promising candidates for photocatalytic CO 2 reduction, yet some inherent drawbacks including low CO 2 activation and sluggish charge carriers’ transfer properties urgently need to be addressed. Herein, we developed an imine-bridged strategy to construct ZnO/COF heterostructure by integrating donor–acceptor COF (TAPT-DMTP COF) on the surface of amino-modified ZnO for photocatalytic CO 2 reduction. The optimal photocatalyst, N ZnO/TAPT-DMTP COF-3, exhibited superior photocatalytic activity for reducing CO 2 to CO and CH 4 , which was significantly higher than pristine COF and non-covalently bridged ZnO/TAPT-DMTP COF. Experimental and photo-electrochemical results reveal that the microstructure of TAPT-DMTP COF, interfacial imine-bridging and S-scheme heterojunction play a crucial role in promoting photoinduced charge transfer and separation, thus improving photocatalytic efficiency. Moreover, in-situ characterization and theoretical calculations indicate the photoinduced electrons transfer from N ZnO to TAPT-DMTP COF upon hybridization, and this S-scheme heterostructure dramatically lowers the energy barrier of rate-determining step from *COOH to *CO. This work provides insight into the covalent-linked COF-based S-scheme photocatalyst and highlights its vital role in enhancing CO 2 reduction.
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Xiaoqian Meng,Rui Gao,Ming Zheng,Xin Zhou,Xianfa Zhang,Xiaoli Cheng,Yingming Xu,Shan Gao,Lihua Huo
Real-time monitoring of chlorine gas (Cl 2 ) with a strong irritating odor is an indispensable means of avoiding its contamination of the air and harm to the body. To achieve this purpose, a novel gas-sensitive material capable of detecting low concentrations of Cl 2 at near room temperature is developed in this paper. ZIF-8 with a kinetic diameter of 3.4 Å in the designed ZnO@ZIF-8 composites is able to sieve gas molecules with different kinetic diameters, enabling effective improvement of the selectivity of the gas-sensitive materials. In addition, the porous structure of ZIF-8 can provide more reactive sites, which is conducive to improving gas adsorption capacity and providing of channels for gas diffusion. In this study, ZnO@ZIF-8 heterojunction composites are prepared by combining the advantages of ZnO and ZIF-8, which provides a new method for real-time monitoring of low concentrations of Cl 2 , and also has potential practical applications in fields such as environmental monitoring and industrial safety.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Xinhua Zhang,Haowen Sun,Shengzhao Song,Yingying Li,Xiuling Zhang,Wentao Zhang
Allium mongolicum Regel is prone to rapid senescence and quality deterioration during postharvest storage. Herein, polyvinyl alcohol/pullulan/ZnO nanoparticles (PVA/PUL/ZnO-Nps) composite films were prepared via solution casting and studied to analyze the effects of ZnO-Nps on the PVA/PUL film matrix. Results revealed that the incorporation of suitable ZnO-Nps effectively reduced the light transmittance, improved water contact angle, water vapor permeability, and mechanical properties of the composite films, as well as enhanced their antimicrobial activity. The composite films were used for the postharvest preservation of A. mongolicum Regel. Results revealed that the PVA/PUL/ZnO-Nps film effectively reduced malondialdehyde accumulation content, superoxide radical generation rate, hydrogen peroxide content, improve the activity of related enzymes, and extend the storage time compared with that of polyethylene films. Therefore, the PVA/PUL/ZnO-Nps film can be used as a novel packaging material for the postharvest preservation of A. mongolicum Regel.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Lihua Zhi,Mingming Zhang,Jibing Tu,Min Li
Vacancy engineering and heterostructure construction are regarded as potent approaches for synergistically boosting hydrogen production in renewable energy conversion. Herein, a selective phosphorization strategy was implemented to fabricate coral-like ZnO/FeCoP@ N -doped carbon hierarchical microspheres (ZnO/FeCoP@NCHMS) via only controllably phosphorizing the Co and Fe atoms in a precursor, which was formed by generating ZnCoFe LDH on the surface of a zinc cobalt coordination polymer microsphere. Then, by adopting a reduction treatment for ZnO/FeCoP@NCHMS, the innovative ZnO/FeCoPv@NCHMS with abundant phosphorus vacancies (Pv) was realized. The introduction of phosphorus vacancy could optimize the electronic structures of metal phosphides and accelerate the reconstruction of active species, thus speeding up the reaction kinetic. Likewise, the plentiful heterointerfaces greatly expedite the transfer of electrons and protons, exposing ultra-high active sites. By virtue of these fascinating characters and the unique coral-like hierarchical architecture, the as-prepared ZnO/FeCoPv@NCHMS reveal preeminent electrocatalytic activities, and the overpotentials for the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) are as low as 177 and 173 mV at 10 mA cm −2 in alkaline medium, respectively. Impressively, the water electrolysis device assembled by ZnO/FeCoPv@NCHMS requires a mere cell voltage of 1.508 V to attain a current density of 10 mA cm −2 . Furthermore, the ZnO/FeCoPv@NCHMS also demonstrate extraordinary durability, sustaining operation for at least 28 h (at 100 mA cm −2 ) during the water splitting process. This study provides novel insights into defect regulation and heterointerface construction for overall water splitting.
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 2
·1-23
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IF 3.8
Liu Huadong,Du Kezhen,Sun Hao
Carbon quantum dots (CQDs) have been increasingly applied in the field of photocatalysis due to their unique optical and electrochemical properties, which can significantly enhance the catalytic property of photocatalyst. In this paper, thermodynamic and kinetic analysis of the experimental process were carried out to investigate the mechanism of CQDs enhancing the photocatalytic performance of ZnO based on the adsorption and degradation test data. Firstly, the nitrogen and sulfur co-doped carbon quantum dots (NSCQDs) were synthesized using a one-step hydrothermal method, while zinc oxide (ZnO) nanocrystals were prepared via the direct precipitation method. The composite material of NSCQDs/ZnO was synthesized through a room temperature impregnation method. The next, the catalysts were characterized by a series of scientific methods. Besides, it creatively used the relevant knowledge of thermodynamics and kinetics in this paper to study the adsorption and photocatalytic processes of ZnO and NSCQDs/ZnO. The photocatalytic results showed that the degradation rate of RhB by NSCQDs/ZnO was up to 91.5% under optimal catalyst conditions at room temperature, which was higher than that of ZnO (49%), and the degradation curves were accorded with the pseudo-first-order kinetic model, and the kinetic constant of NSCQDs/ZnO(0.02666 min −1 ) is 3.45 times that of ZnO (0.00772 min −1 ). What is more, the result of the free radical quenching experiment proved ·O 2 - and OH· were the main active substances. Finally, the aim of this study was to synthesize an efficient and environmentally friendly catalyst and to investigate its mechanism.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Yandong Xu,Wenhao Su,Zihui Jing,Zhouyu Jiang,Mingliang Wang
The development of highly active photocatalysts for H 2 O 2 production is of significant practical importance for addressing environmental issues and energy shortages. In this study, an S-scheme heterojunction photocatalyst with strong redox performance was synthesized through the in-situ growth of the TpPa-Cl covalent organic framework (COF) material on the surface of Cu-loaded ZnO nanorods. The incorporation of Cu disrupts the charge shielding effect of ZnO, promotes the spatial separation of charge carriers, and enhances piezoelectric catalytic activity. Furthermore, the porous ultra-thin COF layer extends carrier lifetime and increases the contact area with reactants, endowing the composite with strong light absorption capacity and excellent oxygen reduction performance. Under the combined influence of the piezoelectric-photocatalytic dual electric field, the H 2 O 2 yield of the composite in pure water reached 1838.8 μmol g −1 h −1 , and the resulting H 2 O 2 solution can be directly utilized for pollutant removal and water disinfection. In situ X-ray photoelectron spectroscopy, density functional theory calculations, and electron spin resonance studies elucidate the S-scheme electron transfer mechanism, which accelerates the transfer of photogenerated carriers and enhances the utilization of electron-hole pairs. This research offers a novel approach for the design and development of catalysts aimed at efficient H 2 O 2 production.
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JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Yinzhong Liu,Xuechun Yang,Yun Guo,Lingchao Wang,Xiaoshun Wei,Qingjie Wang,Yiyu Qiao,Xiaotao Zhu,Lingli Cheng,Zheng Jiao
n -Butanol, a volatile organic compound with relatively low toxicity, requires precise detection for public health and environmental safety. In this research, metal-organic framework (MOF)-ZnO nanostructures (zinc oxide nano-materials with the utilization of metal-organic frameworks as precursors) doped with rare earth elements (Ce, Eu, and Er) were synthesized via a homogeneous co-precipitation route. The produced samples were comprehensively characterized employing X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) method, X-ray photoelectron spectroscopy (XPS), and UV-vis spectroscopy to evaluate the morphological, structural, and optical characteristics. The gas-sensing capabilities of the RE (Ce, Eu, Er)-ZnO series of sensors were subsequently assessed in comparison to those of pristine MOF-ZnO by adjusting the doping type and ratio of rare earth elements to optimize the sensor performance. Among the materials tested, the 0.08 wt% Eu-ZnO sensor exhibits the best-of-breed sensitivity and selectivity, achieving the impressive response value of 616.11 and the detection limit of 361.52 ppb working at 230 °C under 100 ppm of n- butanol exposure, this achievement attains 8.7 times greater than that of pristine MOF-ZnO (70.72). Moreover, with the aid of ultraviolet excitation, the performance of the 0.08 wt% Eu-ZnO sensor is further enhanced, with the sensitivity response elevating to 1000.65 and 4.3 times greater than that of pristine MOF-ZnO (231), leading to the lower detection limit of 259.70 ppb at 220 °C. These findings underscore the significant potential of rare earth incorporation and UV irradiation playing as the synergistic strategy to augment the gas-sensing capabilities, preeminently in the detection of low-concentration volatile organic compounds.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Ruizhe Chen,Leilei Cheng,Wenbo Zhang,Jing Gu,Haoran Yuan,Yong Chen
The catalytic pyrolysis of polyethylene for aromatic production is a promising method for waste plastic disposal and resource recovery. This study investigated the nature of metal species and the distribution of acidic sites in low-density polyethylene (LDPE) scission-aromatization reactions using metal-loaded zeolite catalysts. Under the influence of the 1.0Zn/MOR40 catalyst, LDPE achieved a maximum aromatic selectivity of 45.71 % at 500 °C, based on the total product composition. The results indicated that catalysts with a lower Brønsted acid site to Lewis acid site ratio (BAS/LAS) and a higher concentration of [ZnOH] + species favored the reaction, promoting the generation of olefin intermediates and aromatics while suppressing polycyclic aromatic hydrocarbons (PAHs) formation. However, there was an optimal range for the BAS/LAS ratio and [ZnOH] + species concentration. Reaction results involving squalene and triacontane demonstrated that excessive dehydrogenation of reactants and insufficient BAS could hinder the progression of aromatization reactions, resulting in an increased proportion of PAHs. This study provides a comprehensive understanding of the balance between the synergistic and antagonistic effects of metal-acid sites on the aromatization process.
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ACS Sensors
·
2025
·
IF 9.1
Xiaopeng She,Mengqing Wang,Xinke Jiang,Yi Chen,Cheng Zou,Hongping Liang,Yong Zhou
Ethylene (C2H4) serves as a gaseous biomarker of fruit ripeness during the stages of growth and storage, thus necessitating swift and sensitive detection to assess the evolution of maturity and flavor for target fruits. However, C2H4 vapor is difficult to discern due to its nonpolar inertness and robust molecular structure at room temperature (RT). To this end, a new chemiresistive sensor based on bismuth selenide (Bi2Se3) decorated with zinc oxide (ZnO) nanorods was prepared in this work. Contrary to the high sensor resistance and lack of signal toward C2H4 under dark environments at RT, UV illumination endowed the composite film sensor with low resistance and a noticeable signal. Furthermore, the recovery speed was intriguingly reduced from 10 min to less than 2 min when water vapor was simultaneously introduced. In particular, the optimal 1.0-Bi2Se3/ZnO sensor delivered a response of 38.7% and a response/recovery time of 27/87 s toward 5 ppm of C2H4. Also, the long-term stability was remarkably improved with respect to the pure ZnO counterpart. In addition, excellent linearity across the concentration range from 1 to 20 ppm, good repeatability, and high selectivity over C2H4 were displayed. The effective on-site freshness detection of bananas via the as-prepared 1.0-Bi2Se3/ZnO sensor, by combining electrical signal and visual information demonstrated a huge application potential for fruit ripening monitoring under the synergistic effect of UV illumination and humidity at RT, well catering to the demanding requirements of low power consumption and high miniaturization in the field of future smart sensors.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Hao Cai,Yifei Niu,Tianyuan Guan,Yin Zhang,Zichuan Ma
The intimate coupling of photocatalysis and biodegradation (ICPB) technology has received much attraction because of the advantages of both photocatalytic reaction and biological treatment. In this study, ZnO–CoFe 2 O 4 @BC (ZCFC) with p-n heterojunction was prepared and used in an ICPB system to degrade metronidazole (MNZ) wastewater. The microstructure, morphology, and optical behavior of heterojunctions in ZCFC were investigated using SEM, XRD , UV–vis, FTIR, and XPS techniques. The results showed that ZCFC inherited the advantages of bamboo biochar's large pore size, and its large pore structure could provide a habitat for bacterial colonization in ICPB, thus shortening the internal mass transfer distance. The degradation of MNZ and chemical oxygen demand (COD) by the ICPB system was 86.8% and 58.5%, respectively, which was superior to single photocatalysis (72.5% for MNZ and 43.8% for COD) and single biodegradation (23.5% for MNZ and 20.1% for COD). In ICPB, photocatalysis and biodegradation showed a synergistic effect in the removal of MNZ, and the order of the major reactive oxygen species (ROS) leading to reduced toxicity of MNZ to the biofilm was •OH > h + > O 2 • - . High-throughput sequencing analysis showed continuous evolution of biofilm structures in ICPB enriched a variety of functional species, among which the electroactive bacteria Alcaligenes and Brevundimonas played an important role in the degradation of MNZ. In this study, we investigated the possible mechanism of photocatalytic and microbial synergistic degradation of MNZ in the ICPB system and proposed a new technology for degrading antibiotic wastewater that combines the advantages of photocatalysis and biodegradation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Xiaojing Zhang,Yue Zhou,Tengfei Xu,Kaiwei Zheng,Rongrong Zhang,Zhaoxue Peng,Hongzhong Zhang
In this study, a sequencing batch reactor (SBR) was operated as Anammox and used as parent reactor. Then three SBRs seeded from the parent reactor were adopted for investigating the effect of CuO, ZnO and TiO 2 nanoparticles (NPs) on nitrogen removal, microbial activity and microbial communities of Anammox. The bioactivities of anaerobic ammonia-oxidizing bacteria (AAOB) after different exposure period were detected by batch experiments. Results showed that NPs performed immediate and durable toxicity on Anammox. The nitrogen removal efficiency decreased to 2.3%, 2.9% and 14.0% from 71%, the Anammox rate decreased to 0.13, 0.16 and 0.75 from 2.76 mg h −1 g −1 VSS, and the relative abundance of AAOB decreased to 2.57%, 2.78% and 2.61% from 7.99%, respectively. CuO and ZnO NPs performed similar effect, while CuO NPs led to the most severe toxicity and lowest accumulative effect. TiO 2 NPs showed the lowest toxicity but most durable suppression on Anammox process.
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