CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ruixiang Wang,Huanhuan Dong,Xueyi Li,Li Zhou,Wenkun Zhu,Tao Chen
Semiconductor-based photocatalytic materials have been widely used in photoreduction uranium systems. However, semiconductor-based materials still have some problems such as difficult recovery, few adsorption sites, poor stability, and large bandgap width. Based on this, we constructed 3D porous konjac glucomannan-derived carbon-encapsulated carbon-doped ZnO carbon aerogels (KC@C-ZnO-X) for U(VI) adsorption-photoreduction based on the gelling properties of Konjac glucomannan (KGM) and the unique structure of ZIF-8. The KC@C-ZnO-1.5 achieved the U(VI) removal rate of 93.5 % in 200 mg/L U(VI) solution and greatly weakened the photocorrosion of ZnO. And then the KC@C-ZnO-1.5 continued to maintain an outstanding U(VI) removal rate of 92.9 % after five cycles. Further characterization tests found that the role of 3D KGM-derived carbon aerogel (KC) encapsulation improves the stability of ZnO and carbon doping reduces the band gap width of ZnO. The mechanistic study showed that KC as the “skeleton” encapsulating C-ZnO not only enabled the catalyst to be recycled but also enhanced the photostability of ZnO. The synergistic effect of the C-ZnO and KC promoted photogenerated charge separation and facilitated the generation of ·O 2 − , leading to the further formation of the stable (UO 3 ·NH 3 ·H 2 O) crystalline phase.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yulu Shi,Dong Wang,Xuefen Wang,Zheyi Meng
In this work, flexible and hierarchical structured MnO 2 -ZnO/SiO 2 nanofibrous membranes (NFMs) as easily recyclable Fenton-like catalysts have been developed utilizing the combination of electrospinning and a hydrothermal growth method. By capitalizing the advantages of the high specific surface area and synergism effects of bimetallic oxides, the optimal membranes exhibited prominent catalytic activity in the degradation of malachite green oxalate (MGO). Specifically, within a mere 15 min at an initial pH, 98.1% of MGO was degraded, demonstrating a remarkable degradation rate of 0.2744 min −1 . Free radical scavenging experiments and Electron Paramagnetic Resonance studies conclusively identified superoxide radical species (O 2 •– ) as the main reactive species for the degradation of MGO. Furthermore, the resultant flexible membranes displayed excellent stability and could be effortlessly recycled after catalytic process, surpassing the performance of conventional powdery Fenton-like catalysts. Notably, the resultant membranes could be used for dynamic catalyst for MGO removal and could efficiently treat 418 mL MGO with a flux of 5650.5 L m −2 h −1 . The successful fabrication of these MnO 2 -ZnO/SiO 2 membranes paves the way for the development of more efficient and applicable Fenton-like catalytic materials for water treatments and offers more inspirations for innovative designs of fiber-based or membrane-based catalysts.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Jin-Bo Cheng,Li-Peng Meng,Hai-Bo Zhao,Chun-Xia Zhao,Hui Li,Yuan-Peng Wu
Composite materials made of transition metals/metallic oxides and porous carbon stemming from metal–organic frameworks (MOFs) have drawn tremendous attention within the field of electromagnetic wave absorption. However, the fabrication of most MOFs involves the use of toxic solvents and specially synthesized organic ligands; furthermore, high-pressure hydrothermal processes are commonly employed and are environmentally unfriendly and unsustainable. Herein, a Zn metal–polyphenol network (MPN) was developed by replacing organic ligands with biomass tannic acid at room temperature by using water and ethanol as solvents. The resulting MPN exhibited a microstructure and performance similar to those of MOFs. Subsequently, in situ pyrolysis of the Zn–tannic acid network was conducted to prepare porous carbon/ZnO (PC/ZnO) composites. The PC/ZnO composite pyrolyzed at 700 °C showed a strong reflection loss of −57.8 dB at a matching thickness of 3.5 mm, and a wide effective absorption bandwidth of 5.5 GHz was attained at 2.5 mm. The excellent electromagnetic wave absorption performance can be ascribed to the occurrence of multiple scattering events due to the porous structure, the moderate resistance loss of the porous carbon network, and the strong dipolar and interfacial polarization losses due to the ZnO nanoparticles and defect carbon. This study provides a convenient, environmentally friendly, sustainable, and tunable approach to prepare excellent broadband electromagnetic wave absorbers.
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MOLECULES
·
2023
·Vol. 28
·期 20
·7232
·
IF 4.6
Ruichun Nan,Shurui Liu,Mengwan Zhai,Mengzhen Zhu,Xiaodong Sun,Yisong Chen,Qiangqiang Pang,Jingtao Zhang
In this study, Cu-doped ZnO was prepared via the facile one-pot solvothermal approach. The structure and composition of the synthesized samples were characterized by XRD (X-ray diffraction), TEM (transmission electron microscopy), and XPS (X-ray photoelectron spectroscopy) analyses, revealing that the synthesized samples consisted of Cu-doped ZnO nanoparticles. Ultraviolet–visible (UV-vis) spectroscopy analysis showed that Cu-doping significantly improves the visible light absorption properties of ZnO. The photocatalytic capacity of the synthesized samples was tested via the disinfection ofEscherichia coli, with the Cu-ZnO presenting enhanced disinfection compared to pure ZnO. Of the synthesized materials, 7% Cu-ZnO exhibited the best photocatalytic performance, for which the size was ~9 nm. The photocurrent density of the 7% Cu-ZnO samples was also significantly higher than that of pure ZnO. The antifungal activity for 7% Cu-ZnO was also tested on the pathogenic fungi ofFusarium graminearum. The macroconidia ofF. graminearumwas treated with 7% Cu-ZnO photocatalyst for 5 h, resulting in a three order of magnitude reduction at a concentration of 105CFU/mL. Fluorescence staining tests were used to verify the survival of macroconidia before and after photocatalytic treatment. ICP-MS was used to confirm that Cu-ZnO met national standards for cu ion precipitation, indicating that Cu-ZnO are environmentally friendly materials.Keywords:Cu-doping;nanoparticles;semiconductors;antifungal activity;safety assessment;Zinc oxide
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Yanhong Zhang,Hu Bai,Jiaming Chu,Haiyang Lan,Qi Zhou,Zixian Wang,Weitao Jin,Juan Zhou
A catalyst layer is coated on the fuel electrode in a proton-conducting solid oxide electrolysis cell reactor, which can optimize electrochemical performance and expand the application range of the reactor. In this work, CuO–ZnO catalyst is prepared by oxalate co-precipitation method and combined with a single cell to obtain a reactor with the structure of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) ǀ BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3-δ (BZCYYb) ǀ NiO-BZCYYb (active layer) ǀ NiO-BZCYYb (support layer) | CuO–ZnO (catalyst layer). The electrolysis current density of this reactor with humid air as oxidant and 20%CO 2 –80%H 2 as fuel is 2751 mA cm −2 under 1.3 V at 750 °C. It operates steadily for 138 h under 1.3 V electrolysis at 650 °C, which is better than the reactor without a catalyst layer under this condition. Additionally, CO and CH 4 are detected in the exhaust gas on the fuel electrode side, and the CO selectivity reaches over 90% at 750-550 °C.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Dong Wang,Qian Fu,Jiayi Tian,Hongmiao Zhou,Rui Liu,Difu Zhan,Zhuo Peng,Changcun Han
Zinc oxide (ZnO) has a broad range of applications in piezo-photoelectrochemical water splitting. However, the narrow light absorption range and high photogenerated carrier recombination efficiency make ZnO somewhat limited in applying piezo-photoelectrochemical water splitting. Heterogeneous structure construction is a superior handle to these two drawbacks. Herein, few-layer molybdenum disulfide (MoS 2 ) nanospheres are compounded on ZnO nanosheets (NSs) to form a dual-piezoelectric-material heterojunction of ZnO NSs/MoS 2 . The photocurrent density of ZnO NSs/MoS 2 reaches 0.68 mA/cm 2 at 1.23 V vs. RHE under ultrasonic vibrations. It is 2.4 times higher than that of ZnO NSs under ultrasonic vibrations. The efficient piezo-photoelectrochemical performance is attributed to increased absorption range and polarization field. On the one hand, the narrow band gap of the few-layer MoS 2 widens the light absorption range of ZnO. On the other hand, compared to pure ZnO NSs, ZnO NSs/MoS 2 has an enhanced polarization field under ultrasonic vibrations due to the piezoelectric properties of dual piezoelectric materials, which dramatically accelerates the electron transfer and suppresses the recombination of between electrons and holes. This work provides a new approach to constructing photoelectrodes with effective piezoelectric photocatalytic properties.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Yaru Li,Yong Zhang,Peide Zhu,Jingbai Li,Jiawen Wu,Jiyao Zhang,Xianyong Zhou,Zhengyan Jiang,Xingzhu Wang,Baomin Xu
CsPbI 2 Br perovskite solar cells (PSCs) have garnered significant attention owing to their remarkable thermal stability and desirable bandgap. However, CsPbI 2 Br-based devices still face critical challenges, particularly at the interfaces between the active layer and adjacent components. In this study, a multifunctional ZnO composition has developed as the electron transporting layer (ETL) for CsPbI 2 Br PSCs, enabling simultaneous efficient charge extraction and passivation of buried interface defects in CsPbI 2 Br. The nanocomposite, composed of PbCl 2 -modified ZnO (PbCl 2 -ZnO), facilitates the regulation of bandgap and conduction band to align the energy level of ETL and CsPbI 2 Br. Additionally, the residual PbCl 2 at the buried interface of the perovskite incorporates into the perovskite lattice, reducing I defect and thus improving film quality. The improved energy level alignment at the ETL/CsPbI 2 Br interface and the suppressed I defect-induced carrier nonradiative recombination result in a remarkable reduction in energy loss from 0.73 to 0.52 eV. Finally, the PbCl 2 -ZnO hybrid nanocomposite ETL significantly enhances the efficiency of CsPbI 2 Br PSCs, increasing it from 14.15% to 17.46%, representing one of the highest reported power conversion efficiency (PCE) values for CsPbI 2 Br PSCs. These findings demonstrate the potential of PbCl 2 -ZnO hybrid nanocomposite as an effective ETL for CsPbI 2 Br PSCs.
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MATERIALS LETTERS
·
2021
·
IF 3.423
Tianming Zhao,Qi Wang,An Du
To alleviate the energy shortage and to improve the environmental problems, low-cost and highly efficient materials for H 2 production are of considerable importance. Here, we report a nanostructure from CuS/ZnO NWs on steel mesh via a two-step hydrothermal route for piezo-photocatalytic H 2 production. The CuS/ZnO exhibits an absorption band in visible and ultra-violet bands. Under solar and ultrasonic exposure, the CuS/ZnO NWs demonstrate great piezo-photocatalytic performance (140 μmol g −1 h −1 ). The working mechanism can be attributed to the piezo-photocatalytic effect that the photogenerated electrons and holes are driven along opposite directions by built-in electrical field, decreasing the recombination rate and producing H 2 . This H 2 production mechanism holds great promise for development novel clean fuel.
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Surfaces and Interfaces
·
2021
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IF 4.837
Zepeng Fang,Dagui Chen,Fengpo Yan,Jiangquan Lv,Yongjing Wang,Xiangfeng Guan
The water monitoring parameter of chemical oxygen demand (COD) is a universal way to assess organic pollution in aqueous systems. Though the ways for the detection of COD have been developed for decades, it is still a challenge to achieve highly sensitive and portable COD detectors. In this work, a new electrode composite of Ni/ZnO/Cu (CE-1) was prepared for the electrochemical tests of COD. The electrode was structural characterized by using scanning electron microscope (SEM), transmission electron microscope (TEM), and X-ray Diffractometer (XRD), which showed that self-supported Cu microflowers were successfully electrodeposited on the ZnO micro-prims that were firstly loaded on the Ni foils. The electrochemical behaviors were investigated with the comparison of CE-1 and the electrode that Cu nanoparticles were directly deposited on the Ni foil (CE-2). It shows that CE-1 possesses much superior electrochemical properties than CE-2, which indicates that the introduction of ZnO micro-rod the electrode can significantly enhance the electrocatalysis property. CE-1 exhibited a linear COD detection range of 2.3603 to 577.8 mg/L as well as an excellent correlation with the classic dichromate method (R 2 = 0.99933). Moreover, low detection limit of 0.6036 mg/L (the signal blank/slope=3) and high sensitivity of 2.403 × 10 −2 mA / (mg • L −1 ) can be simultaneously achieved by using CE-1, which is hard to attain for its counterparts reported in literature. CE-1 also shows good concordance with the classic method for real water sample detections. Consequently, the environmentally friendly CE-1 is supposed as a promising candidate for COD detection electrode.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 2
·1-10
·
IF 5.833
Zhou Xi,Wang Shuangling,Zhang Cong,Lin Yulong,Lv Jie,Hu Shuyang,Zhang Shanshan,Li Meng
A sensitive and rapid colorimetric biosensor has been developed for determination of amyloid-β peptide (Aβ) and study of amyloidogenesis based on the high peroxidase-like activity of porous bimetallic ZnO-Co 3 O 4 nanocages (NCs). Due to the high binding ability of Aβ monomer to ZnO-Co 3 O 4 NCs, the catalytic activity of ZnO-Co 3 O 4 NCs can be significantly suppressed by Aβ monomer. This finding forms the basis for a colorimetric assay for Aβ monomer detection. The detection limit for Aβ monomer is 3.5 nM with a linear range of 5 to 150 nM ( R 2 = 0.997). The system was successfully applied to the determination of Aβ monomer in rat cerebrospinal fluid. Critically, the different inhibition effects of monomeric and aggregated Aβ species on the catalytic activity of ZnO-Co 3 O 4 NCs enabled the sensor to be used for tracking the dynamic progress of Aβ aggregation and screening Aβ inhibitors. Compared with the commonly used thioflavin T fluorescence assay, this method provided higher sensitivity to the formation of Aβ oligomer at the very early assembly stage. Our assay shows potential application in early diagnosis and therapy of Alzheimer's disease (AD).
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 5
·1-12
·
IF 3.097
Yao Jianqi,Luo Faliang,Mao Jie,Li Yuting,Sun Xiaolei,Ma Dequan,Luo Chunhui,Li Lei
The nanocrystalline with different crystal planes often displayed diverse physical and chemical properties. However, the effects of crystal planes of inorganic nano-particle have been few focused on. Here, two kinds of nano-crystal ZnO with different crystal planes were used to explore their effect on the crystallization nucleation, crystal morphologies, thermal and thermal-oxidation stability of iPP. The results shown that the (1010) and (0002) planes possessed different effects for iPP. The (1010) planes with non-polar and low surface energy has highly nucleating effective for iPP, the crystallization temperature increased by 11 °C, the size of spherulites decreased, the number of spherulites increased, the nucleation efficiency and crystallization rate up to 57.81% and 1.27 min −1 , the thermal and thermal oxidation stability (TG, OIT, OOT) of iPP improved by 6 °C, 6 min and 12 °C. In contrast, the (0002) planes with polar and high surface energy have no effect for iPP. Our research results indicate that the wettability and interface compatibility between crystal planes and iPP matrix, which was caused by the polarity and surface energy of (1010) or (0002) planes played key role in improving the performance of polymers.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Haozhang Xu,Shoufei Wang,Min Wang,Bo Ge,Guina Ren,Wenzhi Li,Limin Zhao
The treatment of water pollution is faced with a severe postgraduate examination, which shows that pollutants of different properties, such as water-soluble and non-water-soluble pollutants, exist at the same time. In this paper, superhydrophobic S-ZnO/BiOBr cotton (SH cotton) is designed, which has the ability to degrade water-soluble pollutants through light response and the performance of selective removal of organic solvents . The water contact angle of droplets on the surface of the material reached 162°, on which toluene spread rapidly. When applied to an environment with water-soluble pollutants, the material showed an excellent cyclic degradation ability, and the degradation efficiency of 5 cycles’ was higher than 98.4%. Importantly, the 3 cycles of outdoor degradation efficiency was higher than 92.1% under the actual working conditions. The VB positions of the S-ZnO and BiOBr were calculated to be 2.89 eV and 2.96 eV, respectively. The CB positions of the S-ZnO and BiOBr were calculated to be −0.31 eV and 0.38 eV, respectively.
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