ACS Catalysis
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2025
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IF 13.1
Hailong Xie,Yishu Wang,Yu-Hui Xie,Dong Feng,Feng Wu,Delong Xie,Yi Mei,Yu-Xin Liu
Photoreforming of plastic waste offers a solution for reducing environmental pollution while producing value-added products. This study investigates the impact of conduction band edge modulation on the photoreforming efficiency of waste polyethylene terephthalate (PET) using a TiO2/black phosphorus nanosheet (BPNS) heterojunction catalyst, leveraging the tunable bandgap and high carrier mobility of BPNSs. The BPNS/TiO2 heterojunction demonstrated remarkable PET degradation under simulated solar illumination, achieving an 80% weight loss after 35 h. Simultaneously, the system exhibited efficient hydrogen evolution, producing 345.2 μmol g–1 h–1 of H2. Bandgap modulation analysis revealed that as the conduction band edge (ECB) of the photocatalyst became more negative, the increase in CO evolution rates surpassed those of H2 and CO2, likely due to enhanced charge transfer, stronger oxygen adsorption, and a more negative reduction potential. The influence of bandgap tailoring on charge separation, transfer dynamics, and oxygen radical generation, directly linked to photoreforming efficacy, was analyzed through EIS, ESR, and DFT calculations. This study underscores the potential of BPNS/TiO2 heterojunctions for efficient and selective photoreforming of different plastic waste, offering valuable insights into catalyst design for environmental remediation and energy recovery.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 8
·1-12
·
IF 5.3
Shi Zhaoxia,Luo Zhen,Liu Yilu,Liu Zi,Chen Xinyue,Zhang Yintang,Zhou Yanli,Xu Maotian
Four different morphologies of TiO 2 were successfully synthesized and the morphological dependence of the catalytic performance was investigated for monitoring of n -hexane. TiO 2 nanotubes showed the best catalytic performance for the cataluminescence (CTL) reaction of n -hexane because of their high specific surface area and ordered arrangement. To further enhance catalytic activity, a TiO 2 nanotube@Mg-MOF-74 composite was synthesized, which was used to construct a CTL sensor for rapid detection of n -hexane rapidly; the introduction of Mg-MOF-74 improved the adsorption capacity and selectivity. A CTL sensor was constructed based on TiO 2 nanotube@Mg-MOF-74 for the rapid detection of n -hexane, Under the optimal conditions there was a good linear relationship between CTL signal intensity and the concentration of n -hexane in the range 0.20–200.0 mg/L. The detection limit (LOD, S/N = 3) was 0.08 mg/L. The RSD values for 11 consecutive measurements using the same sensor and 7 different sensors were 2.8% ( n = 11) and 3.5% ( n = 7), respectively, demonstrating good repeatability and reproducibility. Finally, the sensor was used to detect n -hexane in air samples from different workplaces, with recoveries ranging from 90.2 to 106.4%, showing good accuracy. Thus, the developed CTL sensor could be used for rapid detection of n -hexane in air, avoiding damage to health caused by excessive inhalation. Graphical abstract
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ACS Catalysis
·
2025
·
IF 13.1
Yu-Dong Shan,Yu-Le Wang,Qing He,Yi-Fang Lu,Song-Hai Wu,Yong Liu,Xu Han
Selective oxidation of cyclohexane (CHA) to KA-oil (cyclohexanol/cyclohexanone) is an important reaction in the chemical industry, which is constrained by high energy consumption and low selectivity. In this study, Mo-doped mesoporous TiO2 (Mo-MT) has been successfully synthesized via calcinating MIL-125(Ti) doped with molybdenum acetylacetonate. A series of characterizations and density functional theory (DFT) calculations reveal that the doped Mo not only decreases the band gap from 3.02 eV (MT) to 2.71 eV (Mo-MT-2) and enhances efficiencies in charge separation and photogenerated carrier transfer but also directly reduces O2 to Mo-η2-O2 peroxo on Mo-MT-2, achieving a 3.2 times higher yield of KA-oil (62.7 μmol) than that by P25 and a high selectivity toward KA-oil of 99.9% under visible-light irradiation. Meanwhile, electron shuttling of benzoquinone facilitates electron transfer from CHA to O2, thus significantly enhancing the KA-oil yield from 62.7 to 431.0 μmol. Diffuse reflectance infrared Fourier transform spectroscopy and electron paramagnetic resonance analyses confirm the electron-shuttling roles of benzoquinone in H-abstraction and H-transfer during selective photooxidation of CHA by Mo-MT-2. DFT calculations further reveal that the benzoquinone-hydroquinone/semiquinone-benzoquinone cycle shuttles electrons from CHA to Mo-η2-O2 peroxo on the surface of Mo-MT-2, thus facilitating H-abstraction from CHA to form C6H11·, coupled with the formation of H2O2. The produced C6H11· then eventually reacts with O2 to form KA-oil. This study enriches our understanding of the importance of peroxo species and electron shuttles in selective photooxidation of C(sp3)–H.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Fengyu Gao,Jiyue Zhang,Jiaying Jiang,Xiaolong Tang,Yuansong Zhou,Honghong Yi
This paper explores an eco-friendly and efficient photocatalytic oxidation (PCO) technology aimed at converting NH 3 into N 2 , which holds considerable importance for environmental conservation and human well-being. Building upon previous investigations of N-TiO 2 catalysts, the research group successfully synthesized an N-TiO 2 catalyst featuring a carbon layer on its surface via mechanical mixing followed by calcination at 400 °C (denoted as C/N-TiO 2 (1), 1 represents the molar ratio of N and Ti). The analysis concentrated on the influence of C content on the PCO efficiency of NH 3 , revealing a peak performance correlated with increasing C levels. Notably, the C/N-TiO 2 (1) catalyst with 3.0 wt% C exhibited remarkable catalytic performance, achieving a conversion rate of 94 % and selectivity of 98 %. The enhancement of catalytic activity and selectivity is primarily attributed to the co-doping of C and N elements. Experimental results indicate that doping with N alone effectively suppresses the recombination of photogenerated carriers under visible light. Furthermore, the simultaneous doping of C and N significantly reduces the band gap energy of TiO 2 (3.18 to 2.90 eV), thereby broadening its photoresponse range. Concurrently, more Ov (Oxygen vacancy) are formed under visible light irradiation, which enhances the PCO performance. More importantly, more acidic sites are introduced to improve the catalyst’s adsorption capacity for NH 3 . Additionally, the impact of various reaction components on the PCO capability of the 3.0 wt% C/N-TiO 2 (1) catalyst is examined further. The findings indicate that oxygen anion radicals produced from O 2 play a critical role in facilitating NH 3 -PCO. However, the presence of CO 2 and extra H 2 O could hinder the approach of NH 3 molecules to the active sites and decrease the longevity of photogenerated ·OH, consequently reducing catalytic effectiveness. This research introduces fresh insights and optimization approaches for enhancing the activity, selectivity, and stability of catalysts.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Zhansong Zhu,Kaiqiang Sun,Linlin Han,Zhencui Wang
Kanamycin is an antibiotic commonly used for the prevention and treatment of infections. The monitoring of kanamycin is of vital significance for maintaining food safety and safeguarding public health. However, the sensitive and reliable detection of kanamycin under visible light irradiation still presents significant challenges. In this study, a self–supported electrode was fabricated from a titanium dioxide nanowire array modified with gold nanoparticles, utilizing a straightforward and controllable electrochemical deposition method. The synthesized photoanode exhibited enhanced photoelectrochemical performance under visible light, which can be attributed to the localized surface plasmon resonance effect of Au nanoparticles. Kanamycin aptamers served as recognition elements, immobilized on the TiO₂/Au nanowires through Au S bonds. The specific recognition and high affinity between the aptamers and kanamycin contributed to the excellent sensitivity of the photoelectrochemical aptasensor. The sensor demonstrated a linear range of 1–500 nM, with a limit of detection as low as 0.42 nM (S/N = 3). Furthermore, the sensor exhibited remarkable anti–interference capability in the presence of other contaminants and maintained excellent stability. It has been successfully applied for the analysis of kanamycin in real milk samples. The simple, efficient, highly sensitive, selective, and reproducible detection platform for kanamycin developed in this study offers significant potential for a wide range of applications.
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THIN SOLID FILMS
·
2025
·
IF 2
Jinyan Pan,Qiao Huang,Ruotong He,Tiejun Li,Hongyang He,Lingsen Yan,Zhenping Wang,Yan Liu,Jing Li,Yunlong Gao
The resistive properties and mechanisms of devices with different structures were investigated by fabricating TiO 2 and Graphene Oxide (GO) films on Indium Tin Oxides (ITO)conductive glass using spin-coating techniques. The results show that our prepared devices can undergo SET/RESET under different voltages and exhibit unique resistive change characteristics. In addition, we found a complementary resistive switching (CRS) behavior in the Al/TiO 2 /GO/ITO structured devices, similar to the memristor which is reverse-series connection of Al/TiO 2 /ITO and Al/GO/ITO. And its resistive behavior is analogous to neuronal firing processes-depolarizing and polarizing behavior. Furthermore, the resistance is modulated by constant voltage and the stimulus gets gradual resistance increase (long-term depression, LTD), and causes progressive resistance decrease (long-term potentiation, LTP). This study provides a reference for the application of the synergistic combination of CRS behavior and tunable resistance states enables a dual-path approach for implementing neuronal and synaptic functionalities in bio-inspired electronics, offering a reference framework for complementary memristor-based bionic neurons that broadens the application scope of Resistive Random Access Memory.
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Journal of the American Chemical Society
·
2025
·
IF 15.6
Jing Liang,Yuanyuan Zhao,Chenyu Yang,Shandong Zhu,Liang Wang,Ke Xu,Xueliang Mu,Yong Han,Zhi Liu,Zhiwei Zhao,Wei Liu,Fei Li,Zhangquan Peng,Edmund C. M. Tse,Qinghua Liu,Junfeng Gao,Qing Li,Jianfeng Li,Jinxuan Liu
Developing efficient, cost-effective, and durable electrocatalysts for proton exchange membrane water electrolysis (PEMWE) remains a significant challenge, requiring the stabilization and enhancement of catalyst activity under harsh conditions. Here, we present cobalt-doped ruthenium dioxide (Co0.3Ru0.7O2) on TiO2 as an electrocatalyst toward an acidic oxygen evolution reaction. The Co0.3Ru0.7O2–TiO2 achieves an impressive overpotential of 322 mV at 1 A cm–2 and demonstrates stable operation for over 1000 h at 500 mA cm–2 in a PEMWE device. Comprehensive experimental and theoretical calculation results demonstrate that the doping of Co atoms into the rutile RuO2 lattice optimizes the geometric configuration. Moreover, the lattice-matched interface between Co0.3Ru0.7O2 and TiO2 promotes interfacial electron redistribution and stabilizes active centers under oxidative conditions. This facilitates a dual-site fully parallel oxidation (DFO) pathway in which intermediates are synchronously adsorbed and desorbed at Ru and Co sites, enabling direct O–O coupling. This work highlights the synergistic effect of the Ru–Co dual sites and TiO2 support in establishing a stable, self-regulating electronic environment that drives efficient intermediate transformation via the DFO mechanism.
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LANGMUIR
·
2025
·
IF 3.9
Lei Qiao,Zhihong Zhou,Mingkun Wang,Zhiwei He
Frequent oil spills and the discharge of oily wastewaters have caused a serious threat to the environment, ecological systems, and the health of human beings. Herein, a durable photothermal and superhydrophobic melamine sponge has been prepared by decorating lignin microspheres (LMs) and TiO2 nanoparticles via the self-polymerization of dopamine. The superhydrophobic sponge shows excellent chemical stability, thermal stability, mechanical durability, and recyclability. The adsorption capacities of the superhydrophobic sponge for oils and organic solvents range from 22.4 to 84.2 g/g, showing high separation efficiencies larger than 98.6% after 15 cyclic tests. Due to the photothermal effect, the maximum surface temperature of the superhydrophobic sponge reaches 65.2 °C under solar irradiation (1 sun), and the superhydrophobic sponge successfully achieves the ice-free property at a low temperature of −17.8 °C under solar irradiation (0.5 sun). Besides, the LMs@TiO2 composite coating can be employed on several substrates (i.e., filter paper, carbon cloth, steel mesh, Al sheet, Cu sheet, and NdFeB) to realize surface superhydrophobicity, and exhibits excellent anticorrosion for the coated NdFeB. Therefore, this study proposes a low-cost and multifunctional superhydrophobic MS, opening a new avenue to the rational design of superhydrophobic MS for applications in oil/water separation, anti-icing, and anticorrosion.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Shishu Sun,Tianyi Sun,Dashuai Zhang,Jinrui Liu,Liying Ren,Chuilong Chen,Wei Yao,Zaifeng Shi
In this paper, the new CNQDs/CuNi/TiO 2-x composites were prepared successfully for the efficient photocatalytic degradation of tetracycline hydrochloride (TCH) under visible light. The CNQDs/CuNi/TiO 2-x composite, which combined carbon nitride quantum dots (CNQDs) and bimetallic CuNi nanoparticles with defective TiO 2-x , showed excellent photocatalytic properties. The upconversion property of CNQDs transformed lower-energy light into higher-energy photons, broadening the light absorption into the visible spectrum. Moreover, the CuNi nanoparticles enhanced charge carrier dynamics through surface plasmon resonance (SPR) effects, improving the photogenerated electron-hole separation efficiency. Under optimal conditions (pH = 9), the CNQDs/CuNi/TiO 2-x composite with 2 % CNQDs achieved the highest degradation efficiency. When the initial TCH concentration was 10 mg/L and the catalyst concentration was 200 mg/L, the degradation efficiency of TCH exceeded 95 % within 60 min. The composite exhibited superior photocatalytic performance and offered the optimal balance of light absorption and charge separation. This research advances the development of sustainable and highly effective photocatalytic materials, providing a promising approach for wastewater treatment and environmental purification.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Fabian Long,Qiuhong Liu,Jingyao He,Jianqiao Zhao,Xitong Li,Xiaoya Gao,Wenjie Zhu,Yongming Luo
Hexavalent chromium (Cr(VI)) is a widespread heavy metal pollutant in industrial wastewater that is highly carcinogenic and deleterious due to bioaccumulation. Detoxifying Cr(VI) to the less-toxic Cr(III) requires a synergistic adsorption–reduction mechanism. In this study, titanium dioxide (TiO 2 )-based composite photocatalysts (X-PNT) with polydopamine (PDA) and engineered oxygen vacancies (OVs) were developed to explore interfacial processes. Characterization results showed that PDA formed a bridge structure between TiO 2 particles, thereby creating charge transfer pathways. The band gap width of the photocatalyst after incorporating PDA narrowed by 0.16 eV compared to pure TiO 2 , and the photocurrent was enhanced by 2.43 times. Density functional theory calculations showed that PDA modification improved the electronic structure and adsorption capacity of TiO 2 . In photocatalytic experiments, the 0.1PNT composite achieved a Cr(VI) removal efficiency of 68.88 %, with light-driven reduction contributing 60.68 %. Quenching experiments confirmed direct electron transfer as the primary reduction pathway. Two-dimensional correlation spectroscopy (2DCOS) revealed a sequential reaction pathway, suggesting that Cr(VI) removal is a multistep synergistic process. This study provides valuable insights into PDA functionalization and OV engineering, facilitating the design and development of highly efficient polymer–metal oxide composites for Cr(VI) detoxification.
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Reaction Chemistry & Engineering
·
2025
·
IF 3.1
Xinlei Jia,Yonghui Wang,Dezhong Wang,Yingying Hu,Lanjuan Xu,Qing Cao,Chao Liu,Lixin Wei
Crude oil emulsions are challenging to break due to their complex and variable composition. While high-performance demulsifiers exist, many conventional systems still face limitations such as poor stability under harsh conditions or insufficient separation efficiency for specific emulsion types. It is thus essential to develop new demulsifiers that combine high salt resistance with effective destabilization capability. Carbon materials, known for their strong adsorption capacity and chemical stability, can efficiently capture emulsified droplets, enabling significantly enhanced demulsification performance even under harsh conditions. The integration of TiO2–carbon heterostructures with fluorinated polyether grafting into magnetic demulsifiers represents a previously unreported strategy. Building on this background, our research innovatively modified the magnetic substrate Fe3O4 by incorporating TiO2 and three types of carbon materials (carbon nanospheres, graphene oxide, and carbon nanotubes). Through a sol–gel approach, fluorinated polyether chains were covalently grafted onto the surface of modified Fe3O4 nanoparticles, leading to the successful synthesis of three novel magnetic composite demulsifiers: Fe3O4@Ti/C–F, Fe3O4@Ti/G–F and Fe3O4@Ti/CN–F. The results demonstrate that these three demulsifiers exhibit excellent demulsification efficiency, acid resistance, and excellent recyclability. They achieve demulsification rates exceeding 85% in neutral and acidic environments. Notably, Fe3O4@Ti/G–F stands out with the best performance. After five cycles of recovery from a biphasic system, its demulsification efficiency remains above 70%. When used at a concentration of 600 mg L−1, it can achieve a demulsification rate of 93.44% within just 30 minutes. In summary, this innovative magnetic nanodemulsifier not only provides an efficient and stable solution for crude oil emulsion separation but also offers significant ecological benefits, holding great potential for application in the treatment of oily wastewater.
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ELECTROCHEMISTRY
·
2025
·
IF 1.7
Hongyu CHEN,Ru TIAN,Jianke LI,Beibei HAN,Guoku LIU,Shiyu YIN,Guiying XU,Kun WANG,Fukuan WANG,Baigang AN,Dongying JU,Weimin ZHOU
TiO2 as a semiconductor photocatalyst has been extensively utilized in the purifications of water and air. However, the wide band gap of TiO2 necessitates its activation by ultraviolet irradiation, when it is utilized as a photocatalyst. To enhance the photocatalyst performance of TiO2, constructing the heterojunction containing TiO2 is considered as a highly effective method. To unfold the actual application, iron metal oxides are firstly utilized to construct the heterojunction of TiO2/α-Fe2O3, and the synthesized TiO2/α-Fe2O3 heterojunction was successfully coated on the surface of coal tar pitch based spherical activated carbons (CTP-SACs). The structures of TiO2/α-Fe2O3/CTP-SACs are verified by the X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The results of UV-vis absorption spectroscopy supports that TiO2/α-Fe2O3/CTP-SACs are promising candidates for the natural light photoncatalysis. It is believed that the exceptional conductivity of CTP-SACs enhances the activity of the photocatalyst, resulting in the TiO2/α-Fe2O3/CTP-SACs exhibiting remarkable sterilization effects under natural light. For instance, the TiO2/α-Fe2O3-60-CTP-SAC shows an excellent sterilization rate (89 %) for the fish culture water under the irradiation of natural light for 20 min. Associating with the excellent liquidity of CTP-SACs, it is considerable that TiO2/α-Fe2O3/CTP-SACs possess the captivating application prospects in a field of the feeding water treatment.
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