CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Wanli Zhang,Meigui Ou,Chunlin Yang
In this paper, erbium-doped gadolinium oxide rare earth oxide nanoparticles (Gd 2 O 3 :Er 3+ ) with good light absorption capacity from the visible to the infrared region were prepared by polyol method, and then compounded with TiO 2 by hydrothermal method. SEM, TEM, XPS, UV–vis and electrochemical workstation were used to study the morphology, structure, UV–vis light absorption and photoelectrochemical (PEC) properties of Gd 2 O 3 :Er 3+ /TiO 2 . The results showed that the Gd 2 O 3 :Er 3+ spherical nanoparticles with a particle size of about 15 nm were uniformly distributed on the surface of the TiO 2 nanorod array, and the Gd 2 O 3 :Er 3+ /TiO 2 nanocomposites had good light absorption capacity in the infrared region. Furthermore, the photocurrent densities of Gd 2 O 3 /TiO 2 and Gd 2 O 3 :Er 3+ /TiO 2 were 2.08 and 2.75 times higher than those of TiO 2 , respectively, manifesting that the broadening of infrared light absorption can improve the PEC property of TiO 2 . Meanwhile, the DFT calculation results showed that the energy band of Gd 2 O 3 :Er 3+ /TiO 2 was significantly narrower than that of TiO 2 , indicating that Gd 2 O 3 :Er 3+ /TiO 2 had a redshift phenomenon of UV–vis absorption. The calculation results of state density showed that the f orbital of Gd 2 O 3 :Er 3+ intersected with the d orbital of TiO 2 , indicating that there is an electron transfer between Gd 2 O 3 :Er 3+ and TiO 2 .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Penghan Cai,Meng Xu,Ming Wei,Tian Zhang,Fei Yao
The SiO 2 –TiO 2 superhydrophilic coatings with photocatalytic activity via heat curing over a low temperature of 100 ℃ were fabricated without a high-temperature calcination process. The effects of the composite ratio of SiO 2 and TiO 2 on the stability of the sols, different treatment processes on the crystalline morphology of TiO 2 , and different solid contents of the sols on the coating properties were investigated. The surface morphology, optical properties and mechanical properties of the coatings were characterised by a water contact angle (WCA) analyser, UV spectroscopy, scanning electron microscopy (SEM) and multiple functional tests. The experimental results demonstrated that the SiO 2 –TiO 2 coating featuring both the intrinsic hydrophilicity of SiO 2 and photophilicity of TiO 2 had the WCA up to 3.5° and exhibited good photocatalytic, self-cleaning, anti-fogging, and mechanical properties.
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CATALYSIS TODAY
·
2024
·
IF 5.2
Wangjun Shi,Min Liu,Haodong Sun,Jiang Yu
In this study, a microwave discharge electrodeless lamp (MDEL) photo-degradation system coupled with anatase TiO 2 (P25) was constructed to improve the selective degradation of NH 3 to N 2 . The MDEL system can generate abundant reactive oxygen species (ROS) with ultraviolet radiation at 185 nm and 254 nm during gas phase reaction . The species and content of ROS generated in the reaction system were determined by oxidation extraction spectrophotometry , and the effects of residence time, temperature, and relative humidity on the production of reactive oxygen species were investigated. In addition, the removal efficiency under different conditions such as initial ammonia concentration, relative humidity and residence time was explored. It was found that the removal rate could reach 83% when the initial ammonia concentration was 100 ppm, relative humidity was 55% and gas residence time was 5.16 s. The high-energy ultraviolet at 185 nm from MDEL could break NH 3 molecules in advance and produced a large amount of ·NH 2 . Besides, NH 3 was converted to N 2 by generating large amounts of ROS, reducing NO x and nitrate generation. Our work presents a novel approach to construct a photocatalytic system for high efficiency degradation of NH 3 .
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zanyun Ying,Xinya Wang,Chengzhi Wu,Shihan Zhang
Photocatalytic NO degradation often suffers from sluggish charge carrier separation and low selectivity. Herein, a series of In 2 O 3 /TiO 2 (P25) composites were synthesized to enhance NO abatement. Benefiting from the conspicuous synergistic effect between In 2 O 3 and P25, the In 2 O 3 /P25 catalysts demonstrated more than double the NO elimination performance compared to pure P25 and In 2 O 3 . The In 2 O 3 /P25 sample with 75 wt% In 2 O 3 (In-P25-75) achieved a NO removal efficiency of 51.7 %, higher than reported catalysts (30.0–49.0 %). It was the successful formation of type-II heterostructure that enabled intimate interfacial contact and provided ample electron transfer channels. Moreover, photoluminescence spectra and photoelectrochemical measurement confirmed the improved separation and inhibited recombination of photogenerated charge carriers in In-P25-75, thereby boosting the NO photocatalytic efficiency. ·O 2 − and ·OH radicals generated by photoinduced electron transfer to the conduction band of P25, along with the induced holes confined to the valence band of In 2 O 3 , facilitated the targeted deep oxidation of trace NO into NO 3 − rather than harmful NO 2 . This work discloses a promising strategy for the efficient removal of NO from the atmosphere by reducing the emission of hazardous intermediate NO 2 .
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Molecular Catalysis
·
2025
·
IF 4.9
Bo Jiang,Shu-Lin Liu,Zhe-Yan Jin,Zhao Wang,Bin-Can Cheng,Ze-Long Guan,Ying Hong,Zhao Wei,Zhi Qiao,Jian Tao,Bao-Lian Su
Selective hydrogenation driven by heat is a critical industrial process for purifying alkene feedstocks with serious problems of energy and H 2 consumption. Photochemistry-assisted strategy offers a sustainable alternative owing to its superiority of H 2 -free reaction under ambient temperature, unfortunately, with a challenging demand on efficient catalysts. Herein, a wide-spectrum-responsive Pd/N-TiO 2 photo-thermal catalyst was developed by a solvothermal method for photochemistry-assisted selective hydrogenation of butadiene in propene. It shows an excellent catalytic performance, with 100 % alkenes selectivity and 100 % butadiene conversion under irradiation of full-light (i.e., 320 nm∼780 nm). Notably, over 53 % butadiene conversion with 100 % alkenes selectivity was successfully retained on Pd/N-TiO 2 after shortening the wavelength range to visible light, much superior to that on Pd-TiO 2 (i.e., <1 % butadiene conversion). Further exploration reveals that the nitrogen doping extends the light-responsive wavelength of titanium oxide from ∼380 nm to above 500 nm owing to the formation of Ti 3+ and oxygen vacancies, which later create a defect energy level (i.e., ∼-0.53 to -0.12 eV) between the valence-conduction band of TiO 2 . The wide spectral response of N-TiO 2 enhances the water photolysis to produce intermediate hydrogen ([H]) that acts as the hydrogen source for the tandem butadiene hydrogenation over the Pd surface. The work indicates that developing a dual-functional catalyst with an expanded light-responsive wavelength is an efficient way to enhance the photochemistry-assisted selective hydrogenation.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Yixiong Wu,Yanqi Xu,Cunjun Li,Hai Wang,Xinyu Wang,Aimiao Qin,Haiqing Qin,Linjiang Wang
One-step selectively photocatalytic phenol hydroxylation to produce Dihydroxybenzenes (DHB) is an attractive and challenging strategy. However, the rapid recombination of photogenerated carriers existed in single component photocatalyst seriously hinders the photocatalytic efficiency. The heterojunction strategy can optimize the band structure of the photocatalyst, and effectively improve the carriers' separation and transfer during the photocatalytic process. Herein, we successfully designed and prepared a 3D TiO 2 @Ni 3 Fe 1 -LDH core-shell heterostructure photocatalyst by coupling TiO 2 nanorods with Ni 3 Fe 1 -LDH nanosheets for the photocatalytic phenol hydroxylation to produce DHB. The results showed that the 3D TiO 2 @Ni 3 Fe 1 -LDH core-shell heterostructure had a suitable energy band structure for the photocatalytic phenol hydroxylation and the heterostructure accelerated the carriers’ separation and transfer. Meanwhile, the high porosity and abundant active sites were conducive to the adsorption of H 2 O 2 and the photogenerated carriers transfer efficiency from the photocatalyst to H 2 O 2 . The 3D TiO 2 @Ni 3 Fe 1 -LDH core-shell heterostructure showed excellent photocatalytic performance of phenol hydroxylation, where the phenol conversion was 48.6%, and the selectivity of DHB was 81.1% at 25 °C and 4 h of light illumination. Furthermore, the as-prepared photocatalysts exhibited good stability after four cycles of experiment. This work provided a convenient and efficient method for the green synthesis of DHB.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Xiaoxiao Dong,Chang Lu,Shuaijie Guo,Siqi Zhang,Xuelian Hu,Wenliu Wang,Yiwei Tang,Shuo Wang,Xiuying Liu
A magnetic NiFe 2 O 4 @TiO 2 @Au composite was successfully synthesized via layer-by-layer assembly approach and exhibited excellent SERS performance. The composite was functionalized with an aptamer modified with Cy3, serving as the Raman signal reporter, and was hybridized with complementary DNA oligonucleotides (cDNA) to construct the NiFe 2 O 4 @TiO 2 @Au@ssDNA SERS aptasensor. This aptasensor enabled the development of a sensitive, specific, and straightforward SERS assay for acetamiprid detection, exhibiting good accuracy. Under optimized conditions, an inverse correlation was established between the acetamiprid concentration and the Raman intensity at the characteristic peak of 1132 cm −1 , spanning a range of 10 −1 -10 4 nmol/L with a LOD of 8.4 × 10 −1 pmol/L. Standard addition experiments to three types of leafy vegetables samples yielded recoveries ranging from 94.30 % to 111.83 %, with a relative standard deviation of <5.56 %. This method shows potential for detecting other hazardous substances in food and environmental samples by simply changing the corresponding aptamers and cDNA.
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PubMed
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ChemistrySelect
·
2024
·Vol. 9
·期 32
·e202401965
·
IF 1.9
Xiulong Shi,Biyang Tuo,Shengqing Wang,Jianli Wang,Yaxin Deng,Xvjun Zhang
Graphical In this paper, heterojunction photocatalyst TiO 2 @BiOCl-BiOI was successfully synthesized by composite modification method combined with sol-gel method, and it was applied to the degradation of CR. Thanks to the heterostructure structure, TiO 2 @BiOCl-BiOI showed excellent photocatalytic performance for CR under simulated sunlight, with a removal rate of 96.45 %. After 5 times of recycling, the removal rate of CR by TiO 2 @BiOCl-BiOI is still higher than 87 %. Under the action of ⋅O − 2 , h + and ⋅O, CR is oxidized to H 2 O, CO 2 and other harmless substances. TiO 2 @BiOCl-BiOI heterostructure photocatalyst with high photocatalytic activity was prepared by the composite modification and sol-gel procedure. TiO 2 nanoparticles highly dispersed on the surface of TiO 2 @BiOCl-BiOI, which provides sufficient active sites for the photocatalytic degradation process. The photodegradation performance of the photocatalyst was evaluated by the removal rate of Congo Red. The researches showed that the degradation effect of TiO 2 @BiOCl-BiOI for Congo Red is significantly stronger than that of TiO 2 and BiOCl-BiOI, which is mainly due to the type-II heterojunction structure of TiO 2 @BiOCl-BiOI and its enhanced visible-light response. The experiments of free radical capture indicated that ⋅ and are the main active species in the photocatalytic degradation system. This study showed that TiO 2 @BiOCl-BiOI can almost completely degrade Congo Red under simulated sunlight, making it the harmless substances such as H 2 O and CO 2 .
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JOURNAL OF POROUS MATERIALS
·
2025
·
IF 3.2
Han Minhang,Hao Mingyuan,Li Zhuohang,Jian Sihao,Ma Chao,Miao Yang
In recent years, ceramic fiber aerogel have been one of the most attractive insulating materials due to its low thermal conductivity, excellent mechanical properties and heat resistance. However, the high radiation heat transfer limits its practical application at high temperatures. In this study, a novel SiO 2 -ZrO 2 fiber aerogel/TiO 2 composite (SZTFAs) was successfully designed and prepared through an air-assisted electrospinning technique in conjunction with the hydrolysis of TiCl 4 . The SZTFAs exhibits anatase TiO 2 nanocoating on the fiber surface. The SZTFAs have low density (14 mg/cm 3 ), good mechanical properties (up to 80% compressive strain, 105.6 KPa), excellent high temperature stability (1200 °C) and fatigue resistance (after 1000 cycles, the maximum stress and Young’s modulus of the SZTFAs remain above 60%) and low thermal conductivity (0.0292 W/(m·K)). After 10 min of exposure to a butane flame, the backside temperature of the SZTFAs was 165 °C, which was approximately 40 °C lower than that of the samples without added TiO 2 . Due to the porous layered three-dimensional structure of SiO 2 -ZrO 2 fibers aerogel and TiO 2 nanolayer with shielding infrared radiation, the SZTFAs exhibit excellent heat resistance and thermal insulation properties. This study provides a method for developing ceramic fiber aerogels with excellent thermal insulation and mechanical properties at high temperatures.
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Small
·
2024
·
IF 13
Weixuan Wang,Zhiyuan Bai,Baojun Wang,Xiaorui Yang,Juan Liu,Hao Li,Yaogang Li,Qinghong Zhang,Chengyi Hou,Kerui Li,Hongzhi Wang
Electrochromic (EC) battery technology shows great potential in future “zero-energy building” by controlling outdoor solar transmission to tune heat gain as well as storing the consumed energy to reuse across other building systems. However, challenges still exist in exploring an electrochemical system to satisfy requirements on both ultra-long optical memory (also called bistability) without continuous power supply and high energy density. Herein, an EC battery is proposed to demonstrate ultra-long bistability (>760 h) based on the reversible deposition and dissolution of manganese oxide (MnO 2 ) without the addition of any mediators. A porous low-barrier hydroxylated titanium dioxide (TiO 2 ) interface is incorporated to synergistically enrich Mn 2+ -affinity active sites for deposition and effectively reduce the electron transport barrier of MnO 2 for dissolution, thereby significantly improving the reversibility, high optical modulation (60.2% at 400 nm), and energy density (352 mAh m −2 ). The modification strategy is also verified on the cathode-less button cells with a much higher average coulombic efficiency (99.9%) compared to the batteries without the porous hydroxylated TiO 2 interface (74.6%). These achievements lay a foundation for advancements in both electrochromism and Zn-Mn aqueous batteries.
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SURFACE AND INTERFACE ANALYSIS
·
2025
·
IF 1.8
Li Jian,Lu Mingxu
Functionalized TiO 2 was prepared by a simple impregnation method, and a layer of functionalized modified TiO 2 coating was introduced on the surface of carbon fiber to improve the wettability and activity of the surface of carbon fiber. FTIR and XPS show that polyethylenepolyamine (PEPA) was grafted to the surface of nano TiO 2 successfully. PEPA-TiO 2 grafting can improve the wettability between carbon fiber and polyamide 6 (PA6), and the contact angle of PEPA-TiO 2 grafting carbon fiber is smaller than that of untreated carbon fiber, but the contact angle gradually increases with the increase of PEPA-TiO 2 grafting concentration.
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npj Clean Water
·
2025
·Vol. 8
·期 1
·1-9
·
IF 11.4
Sun Yu-Ze,Liu Jin-Hua,Li Zhi,Qiu Li-Peng,Song Jia-Bin,Wang Shuai-Jie,Zhang Zhen,Li Ru,Zhang Hong-Di,Han Wen-Peng,Zhang Jun,Long Yun-Ze
In this study, graphene quantum dots/titanium dioxide (GQDs/TiO 2 ) fiber membranes with engineered oxygen vacancies were fabricated using a combination of electrospinning and solvothermal techniques. Oxygen vacancies, as key active sites, enabled spin polarization during the photocatalytic reaction, and the material’s spin polarization was verified by X-ray Absorption Spectroscopy (XAS) and Density Functional Theory (DFT). For the first time, the effects of high magnetic fields (1000–5000 mT) on photocatalytic performance were systematically explored. The findings reveal that the magnetic field markedly enhances spin polarization, facilitating synergistic interactions between oxygen vacancies and photogenerated electrons while significantly suppressing carrier recombination. Under these conditions, the GQDs/TiO 2 fiber membranes achieved a remarkable 52.44% increase in the degradation rate of methylene blue compared to zero-field conditions. Additionally, the study introduces the concept of magnetic field-induced progressive energy level modulation, wherein defect state energy levels undergo gradual adjustment before stabilization under magnetic influence. This work provides critical insights into radical generation mechanisms driven by the interplay between magnetic fields and oxygen vacancies, offering a novel pathway for designing advanced photocatalysts with broad applications in water pollution treatment and sustainable energy solutions.
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