RSC Advances
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2021
·Vol. 12
·期 1
·602-610
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IF 3.361
Yingxin Liu,Kai Liu,Meihua Zhang,Kaiyue Zhang,Jiao Ma,Shuwen Xiao,Zuojun Wei,Shuguang Deng
Highly active and thermally stable Cu–Re bimetallic catalysts supported on TiO2 with 2.0 wt% loading of Cu were prepared via an incipient wetness impregnation method and were applied for liquid phase selective hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) in H2. The effect of the molar ratios of Cu : Re on the physico-chemical properties and the catalytic performance of the Cu–Re/TiO2 catalysts was investigated. Moreover, the influence of various reaction parameters on the hydrogenation of LA to GVL was studied. The results showed that the Cu–Re/TiO2 catalyst with a 1 : 1 molar ratio of Cu to Re (Cu–Re(1 : 1)/TiO2) exhibited the highest performance for the reaction. Complete conversion of LA with a 100% yield of GVL was achieved in 1,4-dioxane solvent under the reaction conditions of 180 °C, 4.0 MPa H2 for 4 h, and the catalyst could be reused at least 6 times with only a slight loss of activity. Combined with the characterization results, the high performance of the catalyst was mainly attributed to the well-dispersed Cu–Re nanoparticles with a very fine average size (ca. 0.69 nm) and the co-presence of Cu–Re bimetal and ReOx on the catalyst surface.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Xueying Cheng,Renquan Guan,Yunning Chen,Yingnan Sun,Qingkun Shang
A Z-scheme heterojunction photocatalyst (TiO 2 (B)/BiOCl 0.7 I 0.3 -P) was constructed (B: bronze phase; BiOCl 0.7 I 0.3 : a solid solution of BiOCl and BiOI in a molar ratio of 7:3; P: polyvinylpyrrolidone). The open channels parallel to the b-axis between the axial oxygen atoms in the bronze TiO 2 , the unique layered structure of BiOCl and the excellent light absorption characteristics of BiOI create excellent conditions for the absorption and utilization of light, the separation and transmission of photo-generated carriers in the photocatalytic process. TiO 2 (B)/BiOCl 0.7 I 0.3 -P can almost completely degrade and mineralize fomesafen within 20 min, and the environmental toxicity of the degradation products is significantly reduced. Combined with high-resolution mass spectrometry, the degradation pathway of fomesafen was proposed. In addition, TiO 2 (B)/BiOCl 0.7 I 0.3 -P can also quickly and effectively degrade phenol and acetaminophen, indicating that it has good universality. To eliminate the harm caused by various herbicides to the ecological environment, photocatalytic technology will play an increasingly important role.
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MATERIALS RESEARCH BULLETIN
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2021
·
IF 4.641
Bing Bai,Linlin Qiu,Deqiang Mei,Zhengfei Jin,Lixin Song,Pingfan Du
The use of a support may overcome the limitations of nano-photocatalysts (poor recyclability, secondary pollution, and agglomeration that decreases photocatalytic activity); however, supports such as fibers, fabrics, films, and foams, still exhibit many defects (low loadings, non-uniform particle loadings, and insufficient loading firmness). In this study, we fabricated TiO 2 /porous carbon fiber cloth through a microwave hydrothermal method and thermal reduction. The highly porous structure of fiber could provide abundant space to firmly-supported TiO 2 nanoparticles. Therefore, the results showed that large amounts of TiO 2 were uniformly and firmly loaded onto the porous carbon fiber cloth, and the obtained composite exhibited excellent photocatalytic activity. The initial loading rate reached 51 wt.%. Even after 10 photocatalytic cycles, the pollutant degradation rate exceeded 95%, and 55% of TiO 2 was retained, showing its stability. This investigation provides a method to prepare supported photocatalysis, which can greatly promote their practical applications for wastewater treatment.
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Catalysis Science & Technology
·
2021
·Vol. 12
·期 3
·1005-1016
·
IF 6.119
Qiang Zhou,Zijiang Zhao,Zihao Yao,Zhongzhe Wei,Songtao Huang,Fangjun Shao,Aiyuan Li,Jianguo Wang
Modulation of the metal–support interaction plays a key role in many important chemical reactions. Here, by adjusting the reduction method of the catalyst and introducing oxygen vacancies in TiO2 to regulate the interaction between Ru and TiO2, four supported Ru nanocatalysts with different encapsulation degrees and electronic structures were obtained. Ru nanoparticles (NPs) partially encapsulated by TiO2 can achieve the selective hydrogenation of 6-chloroquinoline even at room temperature, with a TOF of 12 h−1. Catalytic characterization and DFT calculations indicated that partially encapsulated Ru NPs not only provided active sites for H2 dissociation, but also reduced the probability of Ru NPs being poisoned. Meanwhile, the oxygen vacancies on the surface of TiO2 can adsorb 6-chloroquinoline molecules and provide additional active sites for hydrogenation via hydrogen spillover. Moreover, the enhanced electron transfer from oxygen-deficient TiO2 to Ru made Ru electron-rich, which repelled C–Cl bonds and effectively prevented the production of dechlorination products.
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Journal of Experimental Nanoscience
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2021
·
IF 3.075
Zhiwei Pan,Xinru Zhu,Hong Jiang,Yefei Liu,Rizhi Chen
Flexible and hierarchical nanostructured Pd/SiO2-TiO2 nanofibrous catalytic membranes were fabricated via combining electrospinning technique and a two-step hydrothermal method. The size and distribution of TiO2 nanorods immobilised on SiO2 nanofibrous membranes can be regulated via adjusting the dosage of TiCl3 solution in the first step hydrothermal process. When using an optimal TiCl3 solution dosage of 0.2 mL, a hierarchical structured Pd/SiO2-TiO2-0.2 nanofibrous catalytic membrane with uniformly dense TiO2 nanorods loaded on SiO2 nanofibers is obtained, and still shows good tensile strength and flexibility. The catalytic activity of Pd/SiO2-TiO2-0.2 increases 5 times as compared to Pd/SiO2-TiO2-0 in the reduction of p-nitrophenol (PNP) to p-aminophenol (PAP). The modification with TiO2 nanorods can provide more surface areas for loading the Pd nanoparticles, thereby increased active sites. The three-dimensional open-cell network stacked and assembled by thousands of SiO2 nanofibers and TiO2 nanorods enhances the contact between the reactants and Pd nanoparticles. Both aspects contribute the superior catalytic activity of Pd/SiO2-TiO2-0.2. Furthermore, a continuous and complete conversion of PNP to PAP can be stably operated over 240 min in a gravity-driven catalytic membrane reactor constructed by Pd/SiO2-TiO2-0.2.
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MOLECULAR CRYSTALS AND LIQUID CRYSTALS
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2021
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IF 0.896
Zilong Zhao,Huali Li,Lixiang Huang,Yu Tan,Faqian Liu,Weihua Li
Titanium dioxide (TiO2) is a promising semiconductor for photocathodic protection, but the low efficiency of visible-light absorption and quantum restricts its application. In this study, graphene quantum dots-doped TiO2 (TiO2-GQD) nanocomposites with mesopores were prepared by a sol-gel method under ultrasonic radiation conditions. The prepared TiO2-GQD nanocomposites exhibit excellent performance in the aspects of sunlight absorption, and photocathodic protection. It can protect the active metal and reduce the corrosion rate effectively. It is expected the TiO2-GQD nanocomposites will be used in marine engineering to realize the efficient and sustainable development of marine corrosion protection.
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Surfaces and Interfaces
·
2023
·
IF 6.2
Xinsheng Tang,Hujun Zhang,Ruxangul Jamal,Abdukeyum Abdurexit,Nawrzhan Serkjan,Shuyue Xie,Yiming Liu,Tursun Abdiryim
A self-powered ultraviolet photodetector (UV PD) effectively utilizes UV energy and has attracted greatly attention due to its no consuming of any external power. In this work, TiO 2 nanoarrays (NRs) were synthesized by a one-step hydrothermal method, which was combined with P(TTh-co-EDOT) to realize a high-performance p-n heterojunction UV PD, and P(TTh-co-EDOT) was evaluated as the photosensitive layers in UV PDs for the first time. Furthermore, the working mechanism for the self-powered of UV PD was discussed in detail based on the energy band theory. Different electrochemical deposition cycles of TTh-co-EDOT on the surface of TiO 2 NRs were applied to form p-n heterojunction for achieving the optimum photoelectric performance. Among them, it was found that the optimum UV PD based on face-to-face fabrication of TiO 2 NRs and P(TTh-co-EDOT) from 3 deposition cycles exhibits an enhancement of photoelectric performance without applying any external voltage. Benefiting from the enhanced built-in electric field of the TiO 2 NRs/P(TTh-co-EDOT) interface, balancing photogenerated carriers and the charge separation and transport in self-power mode, the responsivity and detectivity of TiO 2 NRs/P(TTh-co-EDOT)-3C are 2.252 mA/W and 3.413 × 10 10 Jones, with the rise and fall times are 0.256/0.427 s, which exhibited excellent photoelectric properties and stability. TiO 2 NRs/P(TTh-co-EDOT)-1C has the lowest responsivity (0.0995 mA/W) and detectivity (6.035 × 10 9 Jones) and TiO 2 NRs/P(TTh-co-EDOT)-4C has the longest rise and fall times (0.460/0.451 s). These results suggest that the great potential of the TiO 2 NRs and P(TTh-co-EDOT) for high-performance UV PDs.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xu Yin,Wei Li,Hongwei Zhu,Jiatian Yu,Kajia Wei,Zhifeng Gao,Yonghao Zhang,Haoming Chen,Liankai Gu,Weiqing Han
With the wide application of reverse osmosis technology in municipal wastewater treatment, the abundance of generated reverse osmosis concentrates (ROC) has become a significant challenge for water ecosystems. In this work, a fabricated TiO 2 -BNTs/SnO 2 -Sb reactive electrochemical membrane (REM) was used to dispose of municipal ROC wastewater. The effects of the TiO 2 nanotube array (TiO 2 -BNTs) interlayer, current density, initial pH and flow rate on the COD removal of ROC were investigated. In addition, the 3D-EEM fluorescence spectra showed that humic acid-like substances and soluble microbial byproduct-like substances could be removed effectively. GC-MS analysis indicated that most organics, including aldehydes, phenols, ethers, nitriles, ketones, silanes and alcohols, were eliminated after treatment. The REM also exhibited prominent membrane anti-fouling performance in high-salinity wastewater. After 20 cycles, the transmembrane pressure (TMP) was only slightly changed (within 3 kPa) compared to that of the first cycle. Two key parameters, i.e., service lifetime and energy consumption, were investigated in ROC treatment. The service lifetime reached 31350 h (3.5 years, 20 mA cm −2 ) in 0.5 M NaCl solution and 40390 h (20 mA cm −2 , 4.6 years) in actual wastewater, which is highly competitive with previously reported electrodes. Energy consumption reached 10.5 kWh·kg COD −1 in actual ROC wastewater, which is more acceptable compared with current reported electrochemical technologies and exhibits great application prospects for TiO 2 -BNTs/SnO 2 -Sb REMs.
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CRYSTENGCOMM
·
2023
·
IF 3.1
Zhen Fang,Zhongmin Tang,Senming Lin,Runhua Li,Xiaomei Cheng,Jiakang Tian,Lijiang Liu,Jiaheng Peng,Shuai Liu,Benwei Fu,Jianbo Wu,Tao Deng
The slow kinetic process of oxygen evolution reaction (OER) and poor electrochemical stability in acidic environments of electrocatalysts seriously restrict the efficiency of hydrogen production from proton exchange membrane water electrolyzers (PEMWE). In recent years, developing corrosion-resistant and redox-active doped TiO2 with heterogeneous atoms has become an effective strategy to address this challenge. However, most of the reported works only explore the single-element doped TiO2-supported catalyst, and there are few reports comparing the doping effects of various elements at the experimental level, which is crucial for screening high-performance OER electrocatalysts. In this work, seven different metal elements M (M=V, Mn, Fe, Ni, Cu, Nb, W) are selected to doping anatase TiO2 with the same molar ratio (M/Ti) and combined with IrO2 nanoparticles to form M-doped TiO2-supported IrO2 (M-TiO2@IrO2) electrocatalysts. Electrochemical OER activity and stability results indicate that W-TiO2@IrO2 exhibits the best performance among all these catalysts in terms of comprehensively regulating the conductivity of TiO2 and the activity and stability of IrOx within the range of experimental design in this work, which possibly origins from the appropriate energy band structure obtained through W doping, optimizing the intrinsic conductivity of support and interfacial electronic structure between metal oxide and support.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jin Wang,Zhongyan Gong,Yulong Zhang,Yaxin Song,Xinya Chen,Zhihao Lu,Lu Jiang,Chengcheng Zhu,Kun Gao,Kaili Wang,Junjie Wang,Liuyingzi Yu,Soukaina Khayour,Haijiao Xie,Zhuoyao Li,Gang Lu
Electrocatalytic hydrogen evolution reaction (HER) is receiving increasing attention as an effective process to produce clean energy. The commonly used precious metal catalysts can be hybridized with semiconductors to form heterostructures for the improvement of catalytic efficiency and reduction of cost. It will be promising to further improve the efficiency of heterostructure-based nanocatalysts in electrocatalytic and photocatalytic HER using a simple and effective method. Herein, we improve the efficiency of Au/TiO2 in electrocatalytic and photo-electrocatalytic HER by selectively adsorbing p-aminothiophenol (PATP) molecules. The PATP molecules are adsorbed on the gold surface by using a simple solution-based method and favor the charge separation at the Au–TiO2 interface. We also compare the PATP molecules with other thiophenol molecules in the enhancement of electrocatalytic HER. The PATP-induced enhancement in electrocatalysis is then further investigated by density functional theory (DFT) calculations, and this enhancement is attributed to a reduction in Gibbs energy of adsorbed hydrogen after surface adsorption of PATP molecules. This work provides a simple, cost-effective, and highly efficient approach to improve the electrocatalytic and photo-electrocatalytic efficiency of Au/TiO2, and this approach could be easily extended to other heterostructure-based nanocatalysts for performance enhancement and may be used in many other catalytic reactions.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Yuhao Luo,Zhengdong Zhang,Shanhua Chen,Ao Jiang,Xingyu Chen,Xiaodong Zhu,Yuli Di
In this study, to enhance the peroxymonosulfate (PMS)-assisted photocatalytic degradation of Rhodamine B (RhB) under visible light over TiO 2 , a novel halloysite nanotube (HNTs) supported TiO 2 composite photocatalyst was prepared by the sol-gel method. The crystal structure and bonding information of samples were investigated by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy. X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–visible diffuse reflection spectroscopy (DRS), photoluminescence (PL) and electrochemical impedance spectroscopy (EIS) were used to characterize the morphology, optical properties and energy band structure of the samples. The composite with weight ratio of 1:5 (HNTs/TiO 2 ) (named HT-20) exhibited apparently enhanced PMS-assisted photocatalytic RhB degradation efficiency and can degrade approximately 95.31 % of RhB in 30 min, and the first-order rate constants (k) of HT-20-PMS system is about 54.5 times higher than that of B–TiO 2 . In addition, the possible mechanism of enhanced PMS-assisted photocatalytic activity of HT-20 was proposed. The improvement of photocatalytic activity in the composite photocatalyst can be ascribed to the large surface area and strong adsorption capacity of HNTs.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Bayrammyrat Ovezmyradov,Guijun Yang,Yuanyuan Wang,Hui Nan,Caihong Xue,Huiyuan Chen
In order to solve the pollution problem of organic pollutants in water, this study proposed a photocatalyst that efficiently utilizes sunlight, and TiO 2 /HTiOF 3 photocatalytic materials were successfully prepared by a hydrothermal method and used for the degradation of rhodamine B (RhB) solution under simulated sunlight. The effect of time and urea addition on the performance of the material was investigated, and the results showed that the sample with a reaction time of 12 h and a urea addition of 0.05 g exhibited 97 % degradation efficiency and the best photocatalytic degradation activity for RhB solution, which was attributed to the construction of a traditional type II heterojunction of the TiO 2 /HTiOF 3 nanocomposite, which improved the carrier separation rate and maintained a strong redox capacity. This work contributes to the construction of efficient semiconductor photocatalytic nano-heterostructures. The preparation of TiO 2 /HTiOF 3 composites by one-step hydrothermal method provides a new idea for the development of catalysts.
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