CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ning Li,Rui Li,Jianhui Zhao,Lan Liang,Yang Yu,Lingchao Kong,Guanyi Chen,Beibei Yan
Interfacial effect played a critical role in catalytic reactions for environmental remediation. An innovative Mn 3 O 4 @ZnO/TiO 2 heterojunction with multi-interface structure was precisely-designed for the first time through alternate growth of ZnO and TiO 2 nanolayers on Mn 3 O 4 surface by atomic layer deposition. Further, the catalytic property of Mn 3 O 4 @ZnO/TiO 2 was evaluated through denitrification from water under ultrasonic-assisted visible light photocatalysis, which achieved 98.6% NO 3 − -N reduction and 98.8% N 2 selectivity within 120 min. Besides, the Mn 3 O 4 @ZnO/TiO 2 exhibited stability and recyclability during the denitrification process. Mechanism insight revealed significant contributions of the novel multi-interface type II heterojunction. More charge transfer routes and possible reaction interfaces were provided for selective denitrification. Equally important, the synergy between visible light and ultrasound promoted the generation of active radicals. The radical trapping experiment proved the dominate role of e − and CO 2 ∙ - in the denitrification process. Overall, the Mn 3 O 4 @ZnO/TiO 2 appeared to be a promising candidate to remediate aquatic contaminants in ultrasonic-assisted photocatalytic system. Also, this study highlighted an attractive approach for controllable fabrication of multi-interface heterojunctions.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chengmei Sun,Chengcheng Xu,Wenzhen Ren,Fengya Hu,Jun Yuan,Qingru Wang,Yanru Xie,Kai Wang,Dong Zhang
ZnTiO 3 :Eu 3+ ,Mn 4+ phosphors with hexagonal and cubic structure are synthesized by solvothermal method. The structure of ZnTiO 3 depends on precursors and the annealing temperature. Inverse spinel Zn 2 TiO 4 phase reveals the highest thermostability compared with cubic ZnTiO 3 and hexagonal ZnTiO 3 phases. The different phases of ZnTiO 3 crystals exhibit different photoluminescence properties. The forbidden transition of 4 A 2 g → 2 T 2 g for Mn 4+ is observed in Zn 2 TiO 4 and hexagonal ZnTiO 3 (h-ZnTiO 3 ) due to the decreased symmetry. The zero photon line (ZPL) assigned to 2 E g → 4 A 2 g transition of Mn 4+ is absent in all type ZnTiO 3 phases. A sharp emission peak at 714 nm assigned to ν 6 (Stokes emission) mode of Mn 4+ in h-ZnTiO 3 is present when the temperature was below 270 K, and increases sharply in intensity with the temperature decreasing. The similar PL spectra of cubic ZnTiO 3 and Zn 2 TiO 4 co-doped with Eu 3+ and Mn 4+ show a wide emission band composed of Stokes and anti-Stokes modes. The calculated nephelauxetic parameter increases from 0.84 to 1.03 and 1.18 for Mn 4+ in h-ZnTiO 3 , cubic ZnTiO 3 and Zn 2 TiO 4 , respectively, indicating the covalency decreasing, which causes the red shift of ZPL in h-ZnTiO 3 . The Mn 4+ emissions show stronger temperature dependence than that of Eu 3+ , especially for that in h-ZnTiO 3 matrix. Based on the fluorescence intensity ratio between I Eu 3+ and I Mn 4+ , the highest relative temperature sensitivity of 2.46 %K −1 is observed in cubic ZnTiO 3 (c-ZnTiO 3 ) and Zn 2 TiO 4 . Under the excitation at 550 nm, the highest relative sensitivity of 2.9 %K −1 is achieved in c- and h-ZnTiO 3 mixed phases.
研究领域:
材料科学
·
光学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2013
·
IF 4.675
Siyao Guo,Song Han,Haifeng Mao,Shimiao Dong,Congcong Wu,Lichao Jia,Bo Chi,Jian Pu,Jian Li
A versatile synthetic method, which is based on a low-temperature hydrothermal technique, is developed for the fabrication of a microporous ZnO/TiO 2 composite catalyst with different structures (e.g., amorphous , amorphous/crystalline and crystalline). In particular, a novel microporous ZnO/TiO 2 composite with amorphous/crystalline structure is obtained with a 3/1 M ratio of Ti/Zn. This novel ZnO/TiO 2 composite heterostructure not only has a large specific surface area (311.9 m 2 g −1 ) but also exhibits outstanding performance during solar water splitting reactions to generate hydrogen without a noble metal co-catalyst. Based on our in-depth mechanistic analysis, the synergistic effect between the amorphous ZnO and crystalline TiO 2 is responsible for the enhanced performance of this material.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Qiushi Jiang,Zhaolian Han,Yinjie Qian,Yafeng Yuan,Yating Ren,Mingyu Wang,Zhiqiang Cheng
A novel strategy for the preparation of heterojunction derivants by regulating the loading of precursors was proposed and applied for the first time to effectively remove dyes and antibiotics. Zeolite imidazole framework-8 (ZIF-8)-derived ZnO/TiO 2 nano-burst-tube (NBT) was prepared by calcination of ZIF-8 as precursor grown in a solvothermal system adjusted by NH 4 OH or NaOH , TiO 2 NBT as solvothermal substrate. Through a reasonable selection of solvothermal system, ZIF-8-derived ZnO/TiO 2 NBT not only provides enhanced specific surface area (1012.3 m 2 /g), but also enhances the visible light response and charge separation of TiO 2 NBT, whose instantaneous photocurrent density is up to 53 mA cm −2 , which is three times that of TiO 2 NBT. Under visible light irradiation, ZnO/TiO 2 NBT achieved rapid degradation of Rhodamine B(RhB), tetracycline hydrochloride (TCH) and chlortetracycline hydrochloride (CTC) with complete removal within 20 min, outperforming ZnO, ZIF-8, TiO 2 NBT and ZIF-8/TiO 2 NBT, with excellent cyclic photocatalytic performance. The results show that the degradation pathways of RhB, TCH and CTC are different. The work provides a promising strategy for multifunctional derivative photocatalytic materials preparation.
研究领域:
材料科学
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环境科学
·
光催化技术
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 36
·1-19
·
IF 2.8
Hu Lifang,Xing Mengting,He Xin,Yang Kun,Zhu Jichao,Wang Jianquan,He Jie,Shi Jianjun
Semiconductor photocatalytic technology is widely used in the degradation of antibiotic pollutants due to its easy operation, low energy consumption, and no secondary pollution. In this study, ZnO/TiO 2 composite photocatalysts with the different sturcture and the different content were constructed using layered double hydroxide as precursor. The structure and physicochemical properties of the photocatalysts were characterized by the different characterization technologyies, such as XRD, SEM, FT-IR, LRS, UV–vis DRS, N 2 adsorption–desorption isotherm, XPS, UPS, EIS, and so on. The photocatalytic degradation performance and mechanism for tetracycline hydrochloride were studied. The results show that the light response performances of the as-prepared samples are improved by a calcination process. The surface active sites are increased and the transport and separation efficiency of photogenerated electrons and holes are improved. Among them, ZnO/TiO 2 -200 has the fastest degradation rate and the best catalytic activity, and its maximum apparent rate constant is 0.9576 × 10 –3 L·mg −1 ·min −1 . The analysis of photocatalytic mechanism and energy band structure shows that the main active substance of the system is ·O 2 − , and the photocatalytic degradation process follows the type II heterojunction photocatalytic reaction mechanism. This study provides ideas for the design and construction of high-efficiency photocatalytic composites, and provides a reference for the photocatalytic degradation of other organic pollutants.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Mingzhu Zhou,Long Xiang,Yuanxia Quan,Li Li,Xingran Zhang
Many studies aimed to improve the antibacterial ability and applicability of antibacterial surface materials by altering their chemical composition and structure. In this study, we successfully prepared a multifunctional ZnO X /TiO 2 (0< X ≤ 2) nanocomposites by a sol-gel method, which exhibits visible light responsive self-cleaning, antibacterial adhesion, and antimicrobial properties. In the comparison of the three zinc sources, it was found that the ZnO X /TiO 2 prepared with zinc sulfate doping had a water contact angle of only 1.7°, with enhanced hydrophilicity, and exhibited the best photocatalytic activity under visible light, with a removal rate of up to 90.2% of methylene orange (MO). Antibacterial tests revealed the average diameters of the inhibition halos for Escherichia coli and Staphylococcus aureus were 10 and 12 mm, respectively, thereby showing excellent antibacterial activity under visible light. The low photogenerated electron-hole recombination and the high rates of ·OH and ·O 2 - generation through photo-induced interface charge transfer in ZnO X /TiO 2 composite, which is the main reason for enhancing the photocatalytic antibacterial activity under visible light irradiation. Release of Zn 2+ species, resulting in significant antibacterial performance even under dark conditions. This study combines doping and surface modification, introduce abundant surface hydroxyl groups to endow the composite material surface with superhydrophilicity, anti-bacterial adhesion, and antibacterial properties that can meet the needs of clean and antibacterial surfaces in medical.
研究领域:
材料科学
·
生物医学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Juan Wang,Guohong Wang,Xianhong Wei,Guo Liu,Jun Li
A ZnO/TiO 2 heterojunction photocatalyst based on ZnO nanoparticles embedded in the hierarchically structured TiO 2 framework containing parallel macroporous channels and thin mesoporous walls has been synthesized by a common calcination treatment using zinc chloride and tetrabutyl titanate as the raw materials. The materials properties of the ZnO/TiO 2 heterojunction photocatalysts have been carefully characterized with SEM/TEM, XRD, FTIR, XPS, BET analyses, UV–Vis absorption and photoluminescence spectroscopy. The photocatalytic performance for decomposition of Rhodamine B (RhB) under UV light irradiation has been systematically investigated in correlation with the materials structures. The apparent RhB degradation rate constant ( k ) has been determined to be 20.7 × 10 −3 min −1 for the optimal hybrid photocatalyst with 5 wt% of ZnO loading, significantly higher that of pure TiO 2 (12.2 × 10 −3 min −1 ) and pure ZnO nanoparticles (5.7 × 10 −3 min −1 ), respectively. Active species trapping experiments reveal that •OH and •O 2 − play the major roles in the photocatalytic reactions. The enhanced performance can be ascribed to the formation of a direct Z-scheme heterojunction structure between ZnO and TiO 2 in contrast to the usual type-II heterojunction.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
MATERIALS AND MANUFACTURING PROCESSES
·
2014
·
IF 1.486
Quan Zhang,Fei Li,Xinyuan Chang,Deliang He
Photocatalytic activities of three composites, namely nickel foam/Ag-TiO2, nickel foam/Ag-ZnO, and nickel foam/Ag-WO3, were evaluated for toluene degradation in a home-made cuboid photoreactor. Scanning electron microscopy and energy dispersive spectrometry were employed to characterize these photocatalysts. The photodegradation effects of the three photocatalysts peaked under 60% relative humidity, with nickel foam/Ag-TiO2 exhibiting the highest rate of photocatalytic toluene degradation. Controlling humidity could enhance the photocatalytic toluene degradation activities of the three composites, which are significantly affected by a wider band gap. In this study, a dynamic model was proposed and analyzed according to the time-dependent photodegradation of toluene.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Progress in Natural Science-Materials International
·
2023
·
IF 4.7
Lin Zhang,Jun Chen,Lai-Bo Song,Jun-Jie Pan,Qing Luo
Developing effective and stable photocatalysts for organic pollutants degradation are still a big challenge in practical water treatment now. In this work, La doped ZnO–TiO 2 composite (La/ZnO–TiO 2 ) were successfully fabricated by using PVP modified ZIF-8/TiO 2 as template via the absorption and pyrolysis routes. All as-fabricated materials were analyzed by XRD , SEM, TEM , BET, XPS , UV–vis absorption spectra and ESR spectra. PVP modified ZIF-8/TiO 2 was fully transferred into ZnO–TiO 2 after being pyrolyzed at high temperature under air atmosphere. The doping of La can make ZnO–TiO 2 exhibiting red-shifted, which is attributed to the capture of photo-generated electrons by La, leading to the effective separation between photo-generated electrons and holes. Furthermore, the photocatalytic performance of all as-fabricated materials were explored by degradation of tetracycline (TC) solution under UV light irradiation. La/ZnO–TiO 2 exhibits excellent stability. And the photocatalytic degradation rate of La/ZnO–TiO 2 is 99.2%, which is even higher than ZnO (87.4%), ZnO–TiO 2 (87.4%), P25 (TiO 2 ) (92.7%). More than that, the effect of catalyst's dose, effect of TC concentration and effect of pH for TC degradation have been well explored. The excellent photocatalytic performance of La/ZnO–TiO 2 makes it possible to be applied for degradation of organic pollutants in practice.
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产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Kai-Ning Zhang,Ze-Le Lei,Qiu-Feng Lü
The intensification of industrial production has led to a sharp increase in the discharge of toxic organic chemicals and wastewater from printing and dyeing industry. In this study, flower-like ZnO modified TiO 2 @Ti 3 C 2 T x composites (ZnO/TiO 2 @Ti 3 C 2 T x ) were prepared by in-situ oxidation solvothermal method from zinc nitrate hexahydrate and tetramethylammonium hydroxide intercalated Ti 3 C 2 T x . During the solvothermal processes, sodium hydroxide acted as an etchant to further exfoliated the accordion-like Ti 3 C 2 T x into single or few-layer; and at the same time, TiO 2 was formed in-situ on the surface of Ti 3 C 2 T x with simultaneous deposition of flower-like ZnO. The layer structural Ti 3 C 2 T x facilitates the loading and dispersion of ZnO and TiO 2 on its surface. After the in-situ oxidation by solvothermal method, TiO 2 was evenly distributed on the surface of Ti 3 C 2 T x , adjusting the functional groups on the surface of the ZnO/TiO 2 @Ti 3 C 2 T x composite, and improving its adsorption performance. ZnO/TiO 2 @Ti 3 C 2 T x can be used as an efficient adsorbent for malachite green with a high maximum adsorption capacity of 1232.7 mg g −1 , which is higher than that of TiO 2 @Ti 3 C 2 T x (628.57 mg g −1 ). Moreover, a superhydrophilic and underwater superoleophobic ZnO/TiO 2 @Ti 3 C 2 T x @PU sponge was prepared by loading ZnO/TiO 2 @Ti 3 C 2 T x onto polyurethane (PU) sponge. The introduction of ZnO enhances the surface roughness of the ZnO/TiO 2 @Ti 3 C 2 T x @PU sponge, which can effectively separate six oil-water mixtures, and has a high separation flux of 171784 L m −2 h −1 and separation efficiency of 99.6% for cyclohexane-water mixture.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
BIOMEDICAL MICRODEVICES
·
2011
·Vol. 13
·期 5
·865-875
·
IF 3.386
He Zhongyuan,Zhang Qinghong,Wang Hongzhi,Li Yaogang
A capillary microchannel (CM) containing TiO 2 -coated ZnO nanorod arrays was applied as a novel microfluidic device to selectively bind and enrich phosphopeptides. The device was prepared by pumping a TiO 2 sol into a CM containing preformed ZnO nanorod arrays. Different thicknesses of the TiO 2 coating were obtained by controlling the flow duration of TiO 2 sol. The modified CM achieved uninterrupted high-throughput introduction, capture and enrichment of phosphopeptides using continuous-flow operation. The microfluidic device based on the modified CM showed great selectivity, sensitivity and durability for the enrichment of phosphopeptides from tryptic protein digests. These results suggest that microfluidic chips employing this strategy can be used for rapid and high-throughput enrichment of phosphopeptides from complex mixtures.
研究领域:
分析化学
·
蛋白质组学
·
微流控技术
·
纳米材料
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Yubing Yin,Changsong Zhou,Linghan Zhang,Qingyan Meng,Qiangqiang Ren,Shengyu Xie,Zhen Zhang,Hao Wu,Hongmin Yang
Photocatalytic removal of trace methane at room temperature is hindered by low partial pressure, weak adsorption, and sluggish C H bond activation. Here, anatase T(100), T(101), and their ZnO-modified counterparts were evaluated in a closed CH 4 /air system containing approximately 400 ppm CH 4 . Under the standard humidification protocol, the measured inlet water-vapor concentration was 30,900 ± 600 ppmv (3.09 ± 0.06 vol%). ZnO modification enhanced apparent CH 4 removal, reaching 91.70 ± 0.49% for 10%ZnO-T(101) after 1 h of UV irradiation. The 5%ZnO samples were selected for mechanistic comparison because they retained a more pronounced facet-associated difference. HRTEM and UV-Raman confirm the presence of nanoscale crystalline ZnO domains in intimate contact with anatase TiO 2 . PL, transient photocurrent, and EIS indicate improved charge separation and interfacial transport for 5%ZnO-T(101), while TPD, XPS O 1 s, and EPR support weaker retention of CO 2 /carbonate-related species and stronger light-induced ·OH and ·O 2 − signals. At approximately 1000 ppm CH 4 , 10%ZnO-T(101) achieved a CH 4 conversion of 78.46 ± 0.57%, a CO 2 mineralization yield of 60.78 ± 0.50%, and a gas-phase carbon closure of 85.43 ± 0.50%. CO 2 accounted for 77.47 ± 0.68% of converted carbon and CO for 3.96 ± 0.31%; the unclosed 14.57% carbon fraction may include low-abundance oxygenated intermediates, surface-associated carbon species, and analytically unresolved trace products. Four humid-state cycles retained 97.56 ± 0.24% of the initial activity. These results highlight facet-associated ZnO/TiO 2 contact effects involving improved charge utilization, H 2 O/O 2 activation, and product-species regulation.
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产品关联
DOI
高影响因子
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