JOURNAL OF POROUS MATERIALS
·
2023
·Vol. 30
·期 4
·1295-1302
·
IF 2.6
Wang Xu,Xu Gen,Zhou Zhiwei,Qin Xiaojuan,Su Yuansha,Zhang Xianbin,Wu Wenliang
New Cu 2 O@TiO 2 core-shell microspheres were successfully prepared for the first time in this paper. The XRD, N 2 adsorption-desorption, SEM, TEM, EDX and XPS characterizations were utilized to investigate the physical and chemical properties. The liquid phase oxidation of naphthalene was also carried out to test their catalytic performance. The characterization results indicating that the Cu 2 O microspheres were firstly formed by hydrothermal treatment and the rutile TiO 2 coating on the surface would be formed by the hydrolysis of tetrabutyl titanate. The Cu 2 O@TiO 2 - 5.0 catalyst with the molar ratio of copper to titanium species as high as 5.0 has the largest surface area and maximum pore volume resulting from the integrated microspheres with rougher surface thickness of about 6.3 nm, and it showed higher catalytic performance in the liquid phase oxidation of naphthalene. Naphthalene conversion of 43.2%, 1, 4-naphthoquinone selectivity of 26.7% and phthalic anhydride selectivity of 53.4% can be obtained, and it only slightly decreased even after repeated use for 5 times. The method would provide a valuable theoretic reference for the hindrance of Cu 2 O rapid deactivation and the industrial application of the naphthalene oxidation to produce high valuable chemicals.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
iScience
·
2024
·
IF 4.6
Hong Qian,Binxia Yuan,Yuhao Liu,Rui Zhu,Weiling Luan,Chengxi Zhang
In this study, a method was developed to create oxygen vacancies in Cu 2 O/TiO 2 heterojunctions. By varying the amounts of ethylenediaminetetraacetic acid (EDTA), sodium citrate, and copper acetate, Cu 2 O/TiO 2 with different Cu ratios were synthesized. Tests on CO 2 photocatalytic reduction revealed that Cu 2 O/TiO 2 ’s performance is influenced by Cu content. The ideal Cu mass fraction in Cu 2 O/TiO 2 , determined by inductively coupled plasma (ICP), is between 0.075% and 0.55%, with the highest CO yield being 10.22 μmol g −1 h −1 , significantly surpassing pure TiO 2 . High-resolution transmission electron microscopy and electron paramagnetic resonance studies showed optimal oxygen vacancy in the most effective heterojunction. Density functional theory (DFT) calculations indicated a 0.088 eV lower energy barrier for ∗CO 2 to ∗COOH conversion in Cu 2 O/TiO 2 with oxygen vacancy compared to TiO 2 , suggesting that oxygen vacancies enhance photocatalytic activity.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2025
·
IF 2.6
Changqiu Ma,Daheng Jiang,Linghui Zeng,Lixin Zhu,Xiaoliang Xu
Conventional photoelectrochemical (PEC) biosensors based on ZnO and TiO2 face challenges in applications in vivo due to the poor penetration of excitation light through the skin. To address this limitation, we designed a novel near-infrared (NIR)-driven FTO@UC@Cu2O@TiO2 heterojunction biosensor for subcutaneous L-cysteine detection. NIR light penetrates the skin and excites the upconversion material (called UC for short, NaYF4:Er, Yb), which emits visible light at 540 nm. This emission activates the Cu2O semiconductor to generate photocurrent. The Cu2O@TiO2 heterojunction facilitates charge carrier separation and suppresses electron-hole recombination. The biosensor demonstrates stable, sensitive, and reproducible detection of L-cysteine over a range of 10 μM to 10 pM, with a detection limit of 5.2 pM. Notably, it also enables subcutaneous detection covering a range from 10 μM to 100 pM, with a detection limit of 74 pM. These results provide a promising strategy for real-time in situ monitoring of L-cysteine in clinical applications.
研究领域:
生物传感器
·
纳米技术
·
分析化学
·
生物医学工程
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Bio Materials
·
2019
·
IF 0
Huifan Li,Jiahui Zhong,Huijuan Zhu,Yuping Yang,Mengna Ding,Liulin Luo,Yuning Huo,Hexing Li
The hybrid Cu2O-TiO2 photocatalytic composite with a p-n heterojunction was synthesized by the supercritical solvothermal route. The uniformly distributed Cu2O was stably combined with TiO2 to benefit the increase of the specific surface area, the harvesting of visible light, and the separation of photogenerated holes and electrons. As a result, photocatalytic inactivation of Acinetobacter baumannii under visible-light irradiation was facilitated. Based on the photogenerated holes acting as the main active species, the Cu2O-TiO2 photocatalytic heterojunction could induce the leakage of K+ ions and serious damage of the cell structure, leading to the final cell death. During the photoantibacterial process on Cu2O-TiO2, the RecA gene played a significant role in enhancing the survival rate of Acinetobacter baumannii. Furthermore, the great bactericidal effect of Cu2O-TiO2 nanocomposites to different bacteria indicated the potential application for the environment-friendly disinfection.
研究领域:
微生物学
·
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
Journal of Oceanology and Limnology
·
2020
·Vol. 38
·期 5
·1517-1531
·
IF 0.617
Tian Jing,Chen Zhuoyuan,Jing Jiangping,Feng Chang,Sun Mengmeng,Li Weibing
The Cu 2 O/TiO 2 p-n heterojunction composite photoelectrodes were prepared by depositing Cu 2 O nanoparticles on the surface of TiO 2 nanotubes via anodic oxidation and constant current deposition. Field emission scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) analyses showed that Cu 2 O nanoparticles not only deposited on the surface of TiO 2 nanotube array, but also on the wall of TiO 2 nanotubes. The Cu 2 O deposition amount could be adjusted by changing the deposition time. The photoelectrochemical cathodic protection (PECCP) performance of the prepared photoelectrodes for 316L stainless steel (SS) was tested under visible light. The constant current deposition time had a significant effect on the PECCP performance of Cu 2 O/TiO 2 -X photoelectrodes and Cu 2 O/TiO 2 -20 had the best PECCP performance for the coupled 316L SS. This was attributed to the appropriate amount and thickness of Cu 2 O to form p-n heterojunctions with TiO 2 , in which separation of the photogenerated carriers was accelerated and transfer of the photogenerated electrons to 316L SS for PECCP was facilitated.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Tongle Gao,Ting-Ting Li,Xilin Liao,Jia-Horng Lin,Bing-Chiuan Shiu,Ching-Wen Lou
Photoelectrodes constructed with photoactive materials are of great significance for the performance of photoelectrochemical (PEC) sensors. In this study, a facile and efficacious non-enzymatic glucose sensor based on the Cu 2 O/TiO 2 heterojunction was successfully constructed for quantitative determination of glucose concentration. The Cu 2 O/TiO 2 heterojunction was generated by first obtaining TiO 2 nanofibers via electrostatic spinning and high-temperature calcination, and then synthesizing Cu 2 O nanoparticles via a one-step hydrothermal reaction. By introducing the narrow band gap semiconductor Cu 2 O, the defect that pure TiO 2 could not absorb visible light was improved, resulting in the improved photoelectrochemical performance of the composite material compared to the single component semiconductor. The sensor exhibited favorable PEC non-enzymatic glucose sensing performance under simulated sunlight irradiation with a wide linear response range from 1 mM to 14 mM (R 2 = 0.9991) and a low detection limit of 14.4 μM (S/N = 3), along with good selectivity, stability and reproducibility. This also provided more ideas and possibilities for preparing photoelectrode materials by constructing heterojunctions.
研究领域:
材料科学
·
分析化学
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Zhipeng Xie,Lu Wang,Yuhui Cheng,Qian Guo,Haibo Zhou,Congshu Huang,Jingjing Wang,Weifeng Bu
Improving the performance of antifouling coating under illumination-involved harsh environments is of prime scientific and engineering importance. However, it still remains a big challenge due to the strong photo-corrosion character of cuprous oxide (Cu 2 O) that works as the most widely-used primary antifoulant. To address this issue, a novel heterojunction of Cu 2 O@TiO 2 was constructed by in situ adsorption-hydrolysis approach. The as-designed heterojunction structure endows superior photo-stability with Cu 2 O@TiO 2 , which has been proven to proceed via S-scheme mechanism by a set of complementary characterizations including in situ XPS and EPR. As anticipated, the resulted Cu 2 O@TiO 2 coating manifests excellent stability and antifouling performance under illumination-involved mimetic service conditions such as dry-dock and waterline environments, as substantiated by the bioassays and marine field trials. A dual-target photo-synergized enhancing mechanism for the S-scheme Cu 2 O@TiO 2 could be deduced as to: (i) inhibit the accumulation of holes on Cu 2 O to exert a stabilization effect; (ii) boost the generation of reactive oxygen species (ROS, including HO /O 2 − ) to enhance the antifouling property. The methodology provides a proof-of-concept design to fabricate high photo-stable Cu 2 O-based antifoulant materials, with the gain in understanding the intrinsic failure principle of coatings and the biocidal mechanism of cuprous oxide toward marine application.
研究领域:
材料科学
·
海洋生物学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Solar RRL
·
2021
·Vol. 5
·期 4
·2000813
·
IF 8.582
Di Li,Changjian Zhou,Zhongkai Xie,Donghai Chen,Yimeng Zhou,Xiangli Shi,Deli Jiang,Min Chen,Weidong Shi
Due to the low charge separation efficiency and high stability of the CO 2 molecule, photoreduction of CO 2 into a single multielectron product such as CH 4 with a simultaneous high conversion rate and selectivity is challenging. Therefore, it is highly desirable to accelerate charge separation and transfer and provide an electron-enriched catalyst surface for the deep reduction of CO 2 . Herein, a Pd/Cu 2 O/TiO 2 ternary hybrid photocatalyst consisting of Pd nanoparticles (NPs) and Cu 2 O NPs-decorated TiO 2 nanosheets is rationally designed, and highly selective photocatalytic photoreduction of CO 2 into CH 4 is achieved. The Pd/Cu 2 O/TiO 2 photocatalyst shows a high CH 4 production rate of 42.8 μmol g −1 h −1 with an extremely high selectivity of 99.5%. This CH 4 production rate is 61.1, 5.4, and 2.8 times higher than the bare TiO 2 , Cu 2 O/TiO 2 , and Pd/TiO 2 , respectively. In this Pd/Cu 2 O/TiO 2 hybrid, a consecutive multistep charge transfer is steered between the Cu 2 O/TiO 2 heterojunction and Pd, ensures accelerated charge separation and transfer, and leads to the formation of a spatially separated electron-enriched surface (Pd) and hole-enriched surface (Cu 2 O). This spatially oriented charge transfer and the charge-enriched catalyst surface synergistically contribute to the simultaneous high conversion rate and selectivity of CH 4 .
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Jie Jiang,Yuqiang Ding
As a widely used semiconductor photocatalyst , TiO 2 has been explored in organic compounds hydrogenation. In this study, the hydrogenation of C=N bonds on the surface of TiO 2 was accomplished for the first time utilizing Cu 2 O/TiO 2 type-II (p-n) heterojunction . The probe reactions, hydrogenation of N -benzylphenylamine with benzyl alcohol, and N -methylation of amines with methanol exhibited that the hydrogenation of C=N bonds on TiO 2 surface can be achieved through borrowing hydrogen reaction (BH, alcohols as hydrogen source). Additionally, the BH reaction rate could be improved by adding external H + to the reaction system. The catalytic activity of Cu 2 O/TiO 2 was discovered to remain at an efficient level even after six reaction cycles.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 21
·7378-7385
·
IF 5.721
Mengna Ding,Fengyan Shi,Huijuan Zhu,Yuping Yang,Jiahui Zhong,Liulin Luo,Yuning Huo,Hexing Li
A hybrid Cu2O/TiO2 composite loaded on a Cu mesh (Cu2O/TiO2@Cu mesh) was developed via a supercritical solvothermal route. A uniformly distributed Cu2O/TiO2 p–n hetero-junction was stably coated on a Cu mesh, benefiting the visible-light harvesting. In comparison to electrochemistry and visible-light photocatalysis, the photoelectrochemistry process on the photoanode of the Cu2O/TiO2@Cu mesh presented improved bacterial inactivation activity for Acinetobacter baumannii. By means of the main active species of ˙O2− radicals, the photoelectrocatalytic process on the Cu2O/TiO2@Cu mesh also realized complete leakage of K+ ions, much stronger mineralization of the cell membrane and more efficient elimination of the self-recovery function, finally leading to cell death. In comparison, the electrochemistry process only led to the leakage of K+ ions without inactivation of bacteria, and the visible-light photocatalysis process induced partial leakage of K+ ions and cell mineralization after the death of most bacteria.
研究领域:
环境科学
·
材料科学
·
微生物学
·
光电催化
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Cong Liu,Xu Cui,Yanhui Li,Qian Duan
A novel hybrid Cu 2 O@TiO 2 - g -zinc-tetraamino-phthalocyanine (CT- g -ZnTAPc) hollow sphere as “ day-night ” photocatalyst with spatially separated structures was prepared successfully. Firstly, three layers SiO 2 @Cu 2 O@TiO 2 (SCT) was synthesized with core–shell structure. Then zinc-tetraamino-phthalocyanine (ZnTAPc) immobilized on the surface of maleic anhydride (MAH) modified SCT with amide linkages. Finally, hollow CT- g -ZnTAPc spheres were obtained by NaOH etching. In this structure, ZnTAPc was grafted on the outer surface of TiO 2 as the main visible light absorber, while the inner surface was adhered with Cu 2 O as a secondary absorption of the scattered light. Both of Cu 2 O and ZnTAPc sensitized TiO 2 synergistically to broaden light response from ultraviolet to visible region and enhance photocatalytic activity. Meanwhile, TiO 2 - g -ZnTAPc and Cu 2 O@TiO 2 p–n heterojunctions based on the close match band structures, so they were expected to facilitate electron-hole separation more effectively. Moreover, TiO 2 would capture electrons from Cu 2 O and ZnTAPc under visible light and delayed releasing electrons without illumination to perform photocatalyzing in dark as “ day-night ” photocatalysts. K 2 Cr 2 O 7 (Cr (VI)), Rhodamine B (RhB) and tetracycline hydrochloride (TC•HCl) were employed as model pollutants as well as Cr (VI)-RhB coexistence system. Almost 95.2% of Cr (VI) could be reduced by CT- g -ZnTAPc, which was about 1.57 times of Cu 2 O@TiO 2 and 1.64 times of TiO 2 - g -ZnTAPc. Furthermore, CT- g -ZnTAPc had a high specific surface area (219.3 m 2 /g) as an efficient pollutant adsorbent, and was investigated by Langmuir, Freundlich and Temkin isotherm models. The maximum quantity of Cr (VI) adsorbed by CT- g -ZnTAPc was 48.8 mg/g. As a result, CT- g -ZnTAPc would be a potential effective and energy-saving multifunctional photocatalyst.
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
LANGMUIR
·
2021
·
IF 3.882
Juanjuan Yin,Bingcheng Ge,Tifeng Jiao,Zhihui Qin,Meiqi Yu,Lexin Zhang,Qingrui Zhang,Qiuming Peng
Photocatalysts play an increasingly important role in environmental remediation polluted by industrial wastewater. However, the preparation of adsorbents and catalysts with high activity by simple and easy methods is still a great challenge. Here, sandwich-like composite catalyst Cu2O/TiO2/Ti3C2 was prepared by an easily available solvent reduction measure for the highly efficient catalytic nitro compounds. In particular, sandwich-like composite catalyst Cu2O/TiO2/Ti3C2 exhibits excellent catalysis for 2-nitroaniline (2-NA) and 4-nitrophenol (4-NP), and its pseudo-first-order reaction rate constants (k) are 0.163 and 0.114 min–1, respectively. Interestingly, even after eight consecutive cycles of catalytic experiments, the conversion rates of catalytic 2-NA and 4-NP are still greater than 95 and 92%, respectively, demonstrating that the obtained catalyst has excellent catalytic capability and a high reutilization rate. The excellent catalytic performances of Cu2O/TiO2/Ti3C2 can be attributed to the fact that Ti3C2 provides a greater reaction site for the formation of Cu2O and reduces the aggregation during the formation of Cu2O by in situ synthesis. Therefore, ternary composite catalyst Cu2O/TiO2/Ti3C2 prepared by solvent reduction not only supplies a technical method for the catalytic reaction of MXene-based material but also lays the foundation for the development of new photocatalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）