JOURNAL OF NANOPARTICLE RESEARCH
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2023
·Vol. 25
·期 7
·1-16
·
IF 2.5
Shan Chuanfu,Liu Ziyi,Li Fuchao,Jia Wenhan,Cai Gaotuo,Li Ming,Tang Tao,Li Shuai,Wen Jianfeng,Hu Guanghui,Jiang Li,Li Xinyu
TiO 2 -based materials are important photocatalysts but the rapid recombination of photoexcited electron–hole pairs, and the wide band gap both limit their photocatalytic activities. In this work, p-type phosphorus-doped graphene quantum dots (P-GQDs, 5~20 nm) were combined with n-type TiO 2 nanoparticles (20~50 nm) and n-type silver iodide (AgI, 100~200 nm) by a facile sonication and precipitation process to yield a novel ternary photocatalyst TiO 2 /P-GQDs/AgI with n-p-n heterojunctions. The morphologies, structures, optical properties, and chemical environments of photocatalysts were all studied. The resulting ternary photocatalyst exhibited enhanced visible photocatalytic activity toward the degradation of methyl orange (MO), estimated to 70.4-fold that of pure TiO 2 . By contrast, the photocatalytic activities of TiO 2 /GQDs with an n-n heterojunction, TiO 2 /P-GQDs with a p-n heterojunction, and TiO 2 /GQDs/AgI (30%) with an n-n-n heterojunction showed 4.4-fold, 5.3-fold, and 14.2-fold higher than those of TiO 2. The electrochemical and optical measurements revealed that the enhanced photocatalytic activity was linked to promoted charge carrier separation by n-p-n heterojunctions coupled with the increased absorption in the visible region. Overall, the new band structure connected in series p-n heterojunctions looks promising as a highly efficient photodegradation system for future use in decontamination of polluted water. Graphical abstract
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Chengjiu Zhao,Xuezheng Guo,Yanqiao Ding,Chengyao Liang,Bingsheng Du,Wen Niu,Weijie Qu,Yijie Shi,Shuren Cong,Gang Meng,Yong He
Complex gas environments and the demand for room temperature detection will provide challenges for chemo-resistive-type gas sensors in a variety of applications. In this work, 2D/0D SnSe 2 /TiO 2 composite is used as a sensing material, displaying good sensitivity and specificity to ppb-level NO 2 at ambient temperature (25 °C). The response value and time of the SnSe 2 /TiO 2 sensor are 207 % and 139s when exposed to 100 ppb NO 2 , as opposed to 62 % and 183s for the pristine SnSe 2 sensor. The composite sensor also offers great long-term stability for NO 2 and good gas selectivity. Notably, the SnSe 2 /TiO 2 sensor's mixed gases (NO 2 +H 2 S) measurement is done to examine its NO 2 detection capacity in the presence of interfering gas. The constructed composite sensor can accurately detect NO 2 even if the concentration of the reductive interfering H 2 S is 66.7 times higher than that of the oxidative target NO 2 . The effective usage of SnSe 2 modified by TiO 2 for low-concentration, room-temperature NO 2 detection in a complex gas environment is shown by the composite sensor's pleasing gas detection results.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 34
·82560-82574
·
IF 5.8
Li Yuyang,Sun Jian,Chen Yihua,Ma Hang,Zhu Jiaxin,Chen Zhiqiang,Meng Liao,Liu Tongzhou
TiO 2 is a promising photocatalyst used in practical environmental remediation. TiO 2 photocatalysts are usually implemented in two forms: suspended powder and immobilized thin films. A simple technique for fabricating TiO 2 thin film photocatalyst was developed in this work. The fabricated TiO 2 thin film photocatalyst featured a homogeneous nanowire layer grown in situ on the parent Ti plate. The optimized fabrication protocol was to soak the ultrasonically cleaned and acid-washed Ti plate in 30% H 2 O 2 solution containing 3.2 mM melamine and 0.29 M HNO 3 at 80 °C for 72 h and then anneal at 450 °C for 1 h. TiO 2 nanowires with uniform diameters were homogeneously arrayed on the Ti plate surface. The thickness of the TiO 2 nanowire array layer was 1.5 μm. The pore properties of the TiO 2 thin film were close to those of P25. The band gap of the fabricated photocatalyst was 3.14 eV. The photocatalytic activity of the fabricated photocatalyst toward 10 mg/L RhB and 1 mg/L CBZ demonstrated greater than 60% degradation under 2 h UVC irradiation. The RhB and CBZ degradation efficiencies remained at a good level after 5 consecutive cycles. Mechanical wearing, such as 2 min sonication, will not lead to significant suppression of the photocatalytic activity. Photocatalytic RhB and CBZ degradation using the fabricated photocatalyst favored an acidic > alkaline > neutral environment. The presence of Cl − slightly suppressed the photocatalytic degradation kinetics. However, RhB and CBZ photocatalytic degradation kinetics were promoted in the copresence of SO 4 2− or NO 3 − .
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Jun Li,Xiangbin Sun,Yaping Zhang,Tingjun Lu,Zeyuan Wang,Yufeng He,Rongmin Wang
Organic dyes pollution (especially methylene blue) in wastewater has seriously affected the livelihood and health of human beings. To address this issue, in this study, loess-based N-doped TiO 2 (NTiO 2 @ALS) photocatalysts were fabricated through in situ deposition of N-doped TiO 2 (NTiO 2 ) nanoparticles on the surface of acidified loess (ALS) particles by sol-gel method. The characterization was performed by XRF, SEM, FT-IR, XRD, XPS, UV–Vis DRS and BET, and small nanoparticles of NTiO 2 were found to be perfectly bound to the surface of the ALS particles. In addition, what factors affecting the photocatalytic activity were explored and it was found that calcination at 450 °C for 2 h was the best condition, under which the samples possessed the highest degradation efficiency under visible light irradiation. Furthermore, NTiO 2 @ALS was applied to the degradation of methylene blue (MB) and the mechanism of pre-adsorption and photocatalytic degradation was also investigated. Surprisingly, methylene blue (MB) could be degraded by 99.6% post pre-adsorption. This excellent result was attributed to the existence of dual coordination between catalytic active center (NTiO 2 ) and support (ALS) in NTiO 2 @ALS. Most significantly, the introduced ALS particles achieved the effective dispersion of small NTiO 2 nanoparticles and increased the specific surface area of materials, which greatly improved photocatalytic performance and adsorption properties. In brief, NTiO 2 @ALS holds promising application potential for the removal and degradation of organic dyes from wastewater.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Wei Chao,Ying Pengzhan,Qiang Yinghuai,Xia Qingrui,Gu Xiuquan
In this study, the titanium dioxide is prepared at 353 K in one hour using a one-step method. The titanium dioxide prepared using this method consists of anatase clusters with sizes of approximately 5 nm. We find that it has a specific surface area of 504 m 2 /g, the average pore diameter of a stacking hole was 71 A, and the band gaps were approximately 3.25 eV. The photocatalytic activity and stability of the titanium dioxide prepared using this method on methyl orange and rhodamine B was as good as that of P25. This method may have a grander prospect for the industrial production of the photocatalyst due to its property of convenience and energy-saving.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yifan Yang,Mengyao Yang,Zhaohui Huang,Jizeng Zhao,Wei Zhao,Ding'ao Yang,Lin Ren,Xiantang Zhao,Hao Yan,Lei Liu,Lei Gong
With the increasing severity in the service environment of secondary refining furnaces, traditional refractories cannot meet the high requirements. MgO-based fired refractories are subject to the thermal shock effect and slag penetration which are detrimental to their performance. In this study, low-carbon MgO-based refractories are reinforced by an in-situ MgAl 2 O 4 (MA)-TiO 2 dense layer with the addition of low-cost self-prepared titanium carbonitride [Ti(C, N)]. The influence of the addition of as-prepared Ti(C, N) on the properties of low-carbon MgO-based refractories was investigated. The reinforced refractories had no cracks after 190 thermal shock cycles, demonstrating the highest hot modulus of rupture (HMOR) with excellent thermal shock resistance (TSR). After 2.5 h of rotary immersion in a steel slag, the corrosion depth of the composites was only 26.3% of that of commercial MgO-CaO refractories. Based on the thermodynamic analysis, the Ti(C, N) reinforcement mechanism for the low-carbon MgO-based refractories was studied. A MA-TiO 2 dense layer formed during the oxidation process of the composites which enhanced the oxidation resistance . The volume expansion caused by the partial oxidation of Ti(C, N) prevents the penetration of the molten slag to refractories and Ti(C, N) powders forming a protective layer to further effectively protect the composites from slag corrosion owing to its high surface area. In addition, 3CaO·2TiO 2 formed by the reaction between the steel slag and Ti(C, N) further increased the slag corrosion resistance (SCR) of the composites. This research offers a new idea for the material selection for secondary refining furnaces to achieve a green and effective steel-making production route and enriches the understanding of the phase behaviour in the Mg-Al-Ti-C-O-N system under high temperatures.
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Nano Research
·
2023
·Vol. 16
·期 8
·11042-11047
·
IF 9.9
Wang Lei,Zhang Yuehan,Sun Xiaoxuan,Li Yunhui,Zhai Junfeng,Dong Shaojun
Eco-friendly chemical oxygen demand (COD) sensors are highly desired with respect to the importance of COD determination in environmental protection. In this work, a new FTO/TiO 2 /PbO 2 (FTO = fluorine-doped tin oxide) electrode was fabricated with a two-step method and used as an eco-friendly electrochemical COD sensor. The interlayer TiO 2 was employed to strengthen the adhesion of PbO 2 on the FTO substrates by providing a large TiO 2 /PbO 2 interface area. The effects of the factors including applied potential, supporting electrolyte concentration and stirring speed on the sensing performance were investigated. Under the optimized conditions, linear responses to the COD of water with different COD sources were achieved, and a linear range from 5 to 120 mg/L was obtained in the case of sucrose as the COD source. The relative standard deviations (RSD) were determined to be less than 9% for the glucose solutions with the COD of 7.5, 12.5 and 17.5 mg/L. For real sample analysis, the obtained results were comparable with those measured with the conventional dichromate method, with a relative error less than 11%.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Fan Yang,Lulu Zhang,Feifei Li,Zhipeng Zhang,Luyao Cui,Rui Li,Caimei Fan,Jianxin Liu
Hydrogen spillover effects will significantly improve the activity of photocatalytic hydrogen evolution reactions (HER), while their introduction and optimization require the construction of an excellent metal/support structure. In this study, we have synthesized Ru/TiO 2-x catalysts with controlled oxygen vacancy (OVs) concentrations using a simple one-pot solvothermal method . The results show that Ru/TiO 2-x3 with the optimal OVs concentration exhibits an unprecedentedly high H 2 evolution rate of 13604 μmol·g −1 ·h −1 , which was 45.7 and 2.2 times higher than that of TiO 2-x (298 μmol·g −1 ·h −1 ) and Ru/TiO 2 (6081 μmol·g −1 ·h −1 ). Controlled experiments, detailed characterizations, and theoretical calculations have revealed that the introduction of OVs on the carrier contributes to the hydrogen spillover effect in the metal/support system photocatalyst and that the process of hydrogen spillover in this system can be optimized by modulating the OVs concentration. This study proposes a strategy to decrease the energy barrier of hydrogen spillover and enhance photocatalytic HER activity. Moreover, it investigates the effect of OVs concentration on the hydrogen spillover effect in the photocatalytic metal/supports system.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiaoya Zhou,Encheng Liu,Jinze Li,FengFeng Chen,Yan Zhang,Kai Chen,Dongming Qi
The application of high internal phase emulsions (HIPEs) in food, medicine, and cosmetics has been greatly limited due to lack of anti-ultraviolet and anti-oxidant structures. Herein, a series of rodlike TiO2/lignin nanoparticles were prepared by using TiO2 as a hardcore and modified lignin as a coating and dispersion stabilizer. SEM images show that samples have well dispersity and present a rodlike morphology. However, the aspect ratio (AR) values of samples have significant differences due to the presence of different contents of carboxyl and hydroxyl groups in lignin derivatives. Subsequently, their emulsification was predicted by the spreading coefficient and adsorption energy. The results show that the higher AR value of samples, the lower dispersion coefficient and the higher adsorption energy, indicating better emulsification activity. The emulsification test suggests that 0.16 wt % TiO2/arginine-modified lignin with highest AR value could stabilize HIPEs with 90 vol % oil phase volume due to a strong bridging effect. Existing literature shows that the dosage of nanoparticles in HIPEs is the lowest value of other biomass emulsifiers, which shows good biocompatibility. Meanwhile, the oil phase volume of HIPEs in this work is the highest value of other HIPEs prepared with biomass-based particles, which means that these HIPEs would have a higher load capacity for active substances and longer shelf life due to the low water content. The antioxidant experiment shows that TAML could completely clear the •OH, and the scavenging efficiency is 17 times that of pure TiO2. The UV-protection test indicates that the sun protection factor value of TAML reached 149.5, which is the highest value of other lignin-based sunscreen particles. This work provides a method for the preparation of high-performance and multifunctional emulsifiers, which expands the application of lignin and enhances the application potential of HIPEs in medicine, food, cosmetics, and other fields.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yuzhe Liu,Chunlian Quan
This research paper introduces a highly sensitive electrochemical sensor designed for the detection of the sports stimulant methyltestosterone, utilizing a unique ZnO/TiO 2 nanocomposite. Methyltestosterone, an extensively abused anabolic steroid in sports, calls for an efficient detection technique to maintain sporting integrity. The sensor was designed and synthesized with enhanced properties leveraging the specific characteristics of the ZnO/TiO 2 nanocomposite. The sensor demonstrated high sensitivity and selectivity towards methyltestosterone, outstripping traditional detection techniques. When subjected to real-world scenarios, including testing in synthetic urine samples, the sensor showcased outstanding precision and consistency, making it a robust tool for anti-doping control.
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Materials Today Communications
·
2023
·
IF 3.8
Yuan Li,Huigui Zhang,Wenyao Qian,Yong Xia,Dongmei Li,Zhiqiang Guo
In recent years, the emerging S-scheme heterojunction photocatalyst has embodied great potential in promoting the research and application of photocatalytic technology. Herein, a new TiO 2 /g-C 3 N 4 S-scheme heterojunction photocatalyst (TCN-20) was constructed by decorating graphite-like carbon nitride on sea urchin-like TiO 2 microspheres with a large specific surface area and a mesoporous structure. TCN-20 has excellent optical absorption ability, effective photogenerated electron-hole pair separation and very high photocatalytic degradation activity in the simulated sunlight. The degradation rate of TCN-20 for Rhodamine B reaches 96.5 %, and the reaction rate constant is 4.98 and 4.52 times higher than that of pure TiO 2 and g-C 3 N 4 , respectively. Moreover, X-ray photoelectron spectra, Fermi level and band structure analyses as well as radical quenching experiments authenticate the S-scheme charge transfer mechanism of TCN-20. TCN-20 is an easy-to-prepare, non-toxic, inexpensive and promising S-scheme heterojunction photocatalyst with strong redox ability.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Jiahao Wu,Jeilei Tu,Kai Hu,Xiangjiang Xiao,Lei Li,Shouzhe Yu,Yucen Xie,Hao Wu,Yanyun Yang
Multifunctional coatings with broadband antireflective, durable, photocatalytic , and self-cleaning properties can enhance photovoltaic (PV) power generation by reducing the cleaning frequency and surface light reflection of PV modules . However, such coatings must be cost-effective and maintain their functional integrity under harsh outdoor environmental conditions. In this study, bayberry-like SiO 2 @TiO 2 nanoparticles were prepared by a sol–gel method, and their synthesis procedure and SiO 2 /TiO 2 sol volume ratio were optimized based on the refractive index , transmittance distribution, and methylene blue degradation rate . Afterwards, three-layer gradient refractive index broadband antireflective coatings (TGBA) of the optimized SiO 2 @TiO 2 nanoparticles were simulated theoretically and systematically characterized by various experimental techniques. The average transmittance of TGBA-coated glass was 8.93% (380–1800 nm) higher than that of undipped glass, and the photocatalytic performance of TGBA was verified by studying methylene blue photodegradation . The self-cleaning performance of TGBA was assessed by outdoor exposure, multi-cycle ultraviolet (UV) irradiation, and dark storage. The durability of TGBA was evaluated by conducting hardness measurements , abrasion testing, thermal cycling, and damp heat tests . The external quantum efficiency and J–V curves of TGBA-coated PV mini-modules revealed that their short-circuit current densities and power conversion efficiencies were substantially higher than those of undipped modules. The proposed multifunctional coatings can enhance PV power generation in harsh environments.
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