Catalysts
·
2019
·Vol. 9
·期 5
·407
·
IF 3.444
Bin Yang,Guoqiang Chen,Huiwen Tian,Lei Wen
In this study, oxygen vacancy modified TiO2nanorod array photoelectrode was prepared by reducing hydrogen atmosphere to increase its free charge carrier density. Subsequently, a p-type conductive poly 3,4-ethylenedioxythiophene (PEDOT) layer was deposited on the surface of oxygen vacancy modified TiO2, to inhibit the surface states. Meanwhile, a p-n heterojunction formed between PEDOT and TiO2to improve the separation of photo-induced carriers further. The photocurrent of TiO2nanorod array increased to nearly 0.9 mA/cm2after the co-modification under standard sunlight illumination, whose value is nearly nine times higher than that of pure TiO2nanorod array. Thus, this is a promising modification method for TiO2photoanode photoelectrochemical (PEC) performance improving.
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Science China-Materials
·
2019
·Vol. 63
·期 1
·35-46
·
IF 5.636
Wang Wenhui,He Yutong,Qi Limin
The rapid development of perovskite solar cells (PSCs) has stimulated great interest in the fabrication of colorful PSCs to meet the needs of aesthetic purposes in varied applications including building integrated photovoltaics and wearable electronics. However, it remains challenging to prepare high-efficiency PSCs with attractive colors using perovskites with broad optical absorption and large absorption coefficients. Here we show that high-efficiency PSCs exhibiting distinct structural colors can be readily fabricated by employing TiO 2 nanobowl (NB) arrays as a nanostructured electron transport layer to integrate with a thin overlayer of perovskite on the NB arrays. A new crystalline precursor film based on lead acetate was prepared through a Lewis acid-base adduct approach, which allowed for the formation of a uniform overlayer of high-quality CH 3 NH 3 PbI 3 crystals on the inner walls of the NBs. The PSCs fabricated using the TiO 2 NB arrays showed angle-dependent vivid colors under light illumination. The resultant colorful PSCs exhibited a remarkable photovoltaic performance with a champion efficiency up to 16.94% and an average efficiency of 15.47%, which are record-breaking among the reported colorful PSCs.
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JOURNAL OF HAZARDOUS MATERIALS
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2018
·
IF 6.434
Lei He,Yanan Dong,Yane Zheng,Qingming Jia,Shaoyun Shan,Yaqin Zhang
A novel magnetic MIL-101(Fe)/TiO 2 composite was synthesized for photo degradation of tetracycline (TC) under solar light. The composite was characterized by XRD, TGA, SEM, TEM, EDS, BET, FTIR, XPS, VSM, ESR, and PL. The resultant composite was environment friendly material, which exhibited high TC degradation efficiency and excellent reusability. In the meantime, it could be separated easily from TC solution by using magnet, which would save significant time and cost of preparation and degradation, having broad prospect in application. Using 1 g L −1 magnetic MIL-101(Fe)/TiO 2 at pH = 7, 92.76% degradation efficiency was achieved under solar light irradiation in 10 min for 20 mg L −1 TC. Further experiments indicated that TiO 2 introduced in the composite played an important role in the degradation process, which could be activated by the UV light in solar light to generate large amount of O 2 − and OH radicals. The degradation efficiency of TC in this paper was significantly higher than other research papers reported in last three years. This study put forward new magnetic Fe-based metal-organic frameworks (MOFs)/TiO 2 composite for degrading pharmaceutical wastewater.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Jinze Lyu,Junxian Gao,Min Zhang,Qiang Fu,Luna Sun,Shuang Hu,Junbo Zhong,Shuo Wang,Ji Li
The separation and injection of photogenerated charge carriers significantly affect the mineralization efficiency of volatile organic compounds (VOCs). These two processes can be optimized by enhancing the separation of charge carriers and the adsorption of VOCs via material engineering. However, obtaining both high adsorption ability and photoactivity of VOCs simultaneously at the ppm level is difficult. In this work, we grew microporous TiO 2 onto the surface of anatase TiO 2 to construct a homojunction-adsorption layer, enhancing both the adsorption and photodegradation of low concentration of toluene, which was chosen as model VOC. N 2 adsorption/desorption, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), GC-flame ionization detection, and surface photovoltage spectroscopy (SPS) were employed to analyze the physical properties and mineralization of toluene. Results showed that growth of microporous TiO 2 increased the surface area of the catalyst by 160% compared with anatase TiO 2 , as well as induced microporous structure. This phenomenon significantly enhanced the adsorption of toluene at a low concentration of 5.5 mg/m 3 and limited the release of the adsorbed organic compounds. Moreover, SPS and XPS results proved that a homojunction was constructed at the interface of microporous TiO 2 and anatase TiO 2 , greatly improving the separation of photogenerated charge carriers. Owing to the enhanced adsorption ability and photoactivity, the mineralization efficiency of toluene over micropore-anatase TiO 2 composite was 1.78 and 2.12 times higher than that over M-TiO 2 and anatase TiO 2 , respectively.
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Journal of Environmental Sciences
·
2015
·
IF 2.002
Kunyang Chen,Lizhong Zhu,Kun Yang
It is important to develop efficient and economic techniques for removing volatile organic compounds (VOCs) in indoor air . Heterogeneous TiO 2 -based semiconductors are a promising technology for achieving this goal. Anatase/brookite/rutile tricrystalline TiO 2 with mesoporous structure was synthesized by a low-temperature hydrothermal route in the presence of HNO 3 . The obtained samples were characterized by X-ray diffraction and N 2 adsorption–desorption isotherm. The photocatalytic activity was evaluated by photocatalytic decomposition of toluene in air under UV light illumination. The results show that tricrystalline TiO 2 exhibited higher photocatalytic activity and durability toward gaseous toluene than bicrystalline TiO 2 , due to the synergistic effects of high surface area , uniform mesoporous structure and junctions among mixed phases. The tricrystalline TiO 2 prepared at R HNO3 = 0.8, containing 80.7% anatase, 15.6% brookite and 3.7% rutile, exhibited the highest photocatalytic activity, about 3.85-fold higher than that of P25. The high activity did not significantly degrade even after five reuse cycles. In conclusion, it is expected that our study regarding gas-phase degradation of toluene over tricrystalline TiO 2 will enrich the chemistry of the TiO 2 -based materials as photocatalysts for environmental remediation and stimulate further research interest on this intriguing topic.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Zhipeng Ren,Qian Zhu,Lei Cao,Lanlan Fan,Liang Xu,Shixian Xiong
Dopamine (DA) serves as a vital neurotransmitter involved in reward mechanisms, motor coordination, and cognitive processes, establishing the importance of its reliable detection for diagnosing associated neurological disorders. This study presents a microwave-assisted synthesis strategy for rapid fabrication of TiO 2 /MXene/rGO heterojunction nanomaterials, engineered for ultrasensitive electrochemical DA detection. The ternary composite demonstrated significantly enhanced electrocatalytic performance, attributable to the synergistic combination of abundant oxygen vacancies, exceptional electrical conductivity, and ultrahigh specific surface area. These characteristics collectively provide substantial active sites and enable efficient electron transfer during DA oxidation. As a result, the obtained TiO 2 /MXene/rGO electrode exhibits remarkable analytical performance with dual linear response ranges of 0.01–2.4 μM and 2.4–50 μM, a high sensitivity of 21.893 μA μM −1 , and an ultralow detection limit of 5.1 nM. The sensor also demonstrates excellent reproducibility, repeatability, and outstanding selectivity against interfering substances. Moreover, the sensor was applied to determine DA in real samples with satisfactory results.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Yu Zou,Fenghua Shen,Kaisong Xiang,Lele Liu,Haiyang Chen,Qu Yang,Hui Liu
Graphene oxide (GO) is a widely utilized functional anticorrosive material, whereas the presence of numerous oxygen functional groups on its surface tends to cause agglomeration, leading to decrease in anticorrosive properties. In this study, we designed a modification method by using dopamine and nano-TiO 2 to simultaneously enhance the corrosion resistance and thermal stability of GO. The Tafel curves and EIS tests demonstrate that GO modified with dopamine and nano-TiO 2 exhibits superior corrosion resistance. This can be attributed to the adhesive polydopamine formed through the self-polymerization of dopamine, which wraps around the surface of GO, resulting in better dispersion and uniformity of nano-TiO 2 . Additionally, TiO 2 serving as a passivation film enhances the barrier properties of the material. Furthermore, dopamine and nano-TiO 2 effectively cover the C O groups on GO surface, significantly improving its corrosion resistance. Besides, the thermal stability of GO is enhanced due to nano-TiO 2 possessing excellent thermal stability. The enhancement in both corrosion resistance and thermal stability of GO through dopamine and nano-TiO 2 modification is closely related to the amount of added nano-TiO 2 . This work provides valuable insights for simultaneously enhancing both thermal stability and corrosion resistance of GO.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Xinjian He,Yuyan Zhuang,Danhong Gao,Hongwei Liu,Jintuo Zhu,Sheng Huang
Carbon monoxide is a colorless, odorless gas that can cause irreversible effects on the brain if inhaled in excess. Accurate measurement of carbon monoxide is very important for human health. The current carbon monoxide sensors work with long response time and narrow detection range. Therefore, in this work, TiO 2 was coated on perovskite nanocrystals Cs 3 Cu 2 I 5 by solution method to obtain high performance carbon monoxide gas sensitive material Cs 3 Cu 2 I 5 /TiO 2 nanocrystals. Moreover, high precision and anti-interference measurement of carbon monoxide was realized by combining with machine learning. The carbon monoxide sensor based on Cs 3 Cu 2 I 5 /TiO 2 has a short response/recovery time of 3.8/17.5 s and a sensitivity of 0.36 at 10 ppm. Then, an intelligent classification algorithm is used to quickly identify the concentration of carbon monoxide gas, and the recognition accuracy is as high as 99.5 %, which is higher than that of traditional sensitivity determination of gas concentration methods, due to the fact that machine learning involves multiple features of the electrical response curve, rather than the single feature of traditional sensitivity determination methods. Finally, the sensor was integrated into the self-rescuer for coal mine to realize the intelligent opening in the presence of CO, and improved the rescue efficiency. We believe that this sensor will be promising in the field of carbon monoxide, and the idea of using machine learning to intelligently recognize gas concentrations can be extended to other gas sensors.
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RSC Advances
·
2025
·Vol. 15
·期 27
·21300-21310
·
IF 4.6
Yu-Ling Qi,Hao-Yu Zhou,Guo-Zhi Han
Self-healing hydrogels have the ability to repair themselves at the incision after being damaged and can return to their original state of morphology and performance. However, constructing a hydrogel with superior mechanical strength and tensile properties after self-healing remains a challenge. In this work, using polyvinyl alcohol, borax, chitosan, and a type of SiO2@g-C3N4@TiO2 nanoparticles as raw materials, a novel photo-regulated self-healing hydrogel was developed using a freezing–thawing method, which could achieve a synchronous increase in Young's modulus and tensile strength under visible light irradiation during the self-healing process. In addition, the doping of the SiO2@g-C3N4@TiO2 nanoparticles improved the self-healing performance of the PVA-based hydrogels. With the addition of a trace amount of SiO2@g-C3N4@TiO2 nanoparticles, the self-healing efficiency of the hydrogel increased from 26.67% to 45.67% in darkness and from 41.33% to 65.67% under visible light irradiation.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wenqing Qin,Jiewei Xu,Xuyi Wei,Junwei Han
The closed pores and slow kinetics of conventional Ti-based adsorbents (HTO) hinder their industrial application in the selective adsorption of Li + from wastewater. Herein, a surface modification and spatial optimization strategy was developed to improve the adsorption performance of HTO for Li + . The strong hydrophilicity caused by high roughness of modified HTO increases the contact area between the Li + -containing solution and the absorbent, which shortens the diffusion path of Li + to the adsorbent surface and accelerates the migration of Li + to the adsorbent surface. The excellent lithium affinity of N heteroatom on the surface of modified HTO promotes the conversion of hydrated Li + into activated Li + , which can be easily captured by the adsorbent. The large specific surface area of modified HTO provides abundant absorption sites of Li + . The material with rich pores provides sufficient space to improve the adsorption capacity of Li + . The small particle size shortens the transport path of Li + from the adsorbent surface to its interior, thereby reducing the transport resistance, which accelerates the migration of Li + into the adsorbent and releases a large number of active sites on the surface. The experimental results show that the Li + adsorption rate is increased from 0.37 mg·g −1 ·min −1 to 0.82 mg·g −1 ·min −1 after modification. The adsorption capacity of the adsorbent is 49.05 mg·g −1 and it remains 96.7 % after 5 cycles, indicating excellent adsorption performance and recyclability. This study provides a strategy for effective extraction of Li + from low concentration solutions.
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JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Zhengjiang Liu,Dan Zhou,Huiyan Ma,Lei Xing,Qiancheng Zhang,Juming Liu
SO 4 2− /CeO 2 /TiO 2 composite oxides are successfully fabricated via sol-gel method and impregnation process for photocatalytic H 2 production. The characterization results from XRD, FTIR and TEM revealed that the heterojunctions were formed by the formation of Ti-O-Ce bond across the SO 4 2− /CeO 2 /TiO 2 interface, which was contributed significantly to separation of photo-generated carriers. Py-FTIR spectra and XPS results indicated that Lewis acid and Brønsted acid sites were formed over the surface of SO 4 2− /CeO 2 /TiO 2 composite, which was owing to SO 4 2− coordinated to the metal on the sample surface. The induced Lewis acid sites could enhance the separation of photogenerated carriers, and Brønsted acid sites could provide protons for photocatalytic H 2 production. In addition, the Lewis acidity could facilitate the shift of conduction band minimum to a more negative value, which improves the photocatalytic H 2 production capacity of SO 4 2− /CeO 2 /TiO 2 . The results of photocatalytic H 2 production revealed that SO 4 2− /CeO 2 /TiO 2 composite exhibits superior photocatalytic activity compared to bare CeO 2 , TiO 2 and CeO 2 -TiO 2 composite. Notably, it achieves the average H 2 yield rate of 6295.2 μmol· g −1 h −1 over a period of 5 h. Combine the results of spectra analysis and photocatalytic activity H 2 evolution, it can be concluded that the synergetic effects of heterojunction structure of CeO 2 /TiO 2 composite and acid impregnation promoted the photocatalyst activity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Yue Xu,Junlu Sheng,Xia Yin,Jianyong Yu,Bin Ding
Exploiting high-added-value textiles equipped with multiple functionalities like ultraviolet (UV) resistance, waterproofness, and thermal-moisture comfort is facing tremendous demand by a more discerning consumer market. However, the major challenge is to realize the equilibrium among the multifunction. Herein, a new attempt of fabricating superhydrophobic electrospun polyacrylonitrile (PAN)/polyurethane (PU)/titanium dioxide (TiO 2 ) nanofibrous membranes has been tried, and the membranes exhibited multifunction of UV resistance, waterproofness and breathability by coating modification with 2-hydroxy-4- n -octoxybenzophenone (UV531) and fluorinated acrylic copolymer (FAC). TiO 2 NPs as inorganic blocker and UV531 as organic absorber were utilized to impart the excellent double UV resistant function for the modified nanofibrous membranes. The hydrophobic coating with FAC endowed the pristine membranes with enhanced superhydrophobic wettability and the advancing contact angle was 152.1°. Regulating the addition amount of TiO 2 NPs, the UV531 and FAC concentration, the multiple functionalities of the modified PAN/PU/TiO 2 were systemically optimized: robust tensile strength (14.6 MPa), good ultraviolet protection factor of 1485, modest waterproofness (62 kPa), and moisture breathability (12.9 kg m −2 d −1 ). The equilibrium among the multifunction of the as-prepared membranes indicated their diverse possibilities can be used in various applications, including high-altitude garments, protective clothing, covering materials, self-cleaning materials, and other medical products.
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