Catalysis Science & Technology
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2021
·Vol. 12
·期 3
·1005-1016
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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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Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 23
·5024-5033
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IF 6.569
Menglong Yao,Hongkang Wang,Ruifeng Qian,Tianhao Yao,Jian-Wen Shi,Yonghong Cheng
We report a facile solvothermal synthesis of hollow TiO2 nanospheres using phenolic resin nanospheres as templates under magnetic stirring conditions, followed by annealing. The as-prepared hollow TiO2 nanospheres show an inner diameter of ∼400 nm, a shell thickness of ∼45 nm, and a high specific surface area of 33.8 m2 g−1. When used as anode materials for lithium-ion batteries and sodium-ion batteries, the hollow TiO2 demonstrates excellent cycling stability and rate capability, delivering high lithium storage capacities of 178/138 mA h g−1 at 0.2/1.0 A g−1 after 200/1000 cycles, and high sodium storage capacities of 213/177/115 mA h g−1 after 200/1000/4000 cycles at 0.2/1.0/5.0 A g−1. The outstanding electrochemical performance is related to the robust structural stability of the hollow nanostructured TiO2, which can be expected as a promising anode material for next generation alkali metal ion batteries.
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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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RSC Advances
·
2021
·Vol. 12
·期 1
·602-610
·
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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PubMed
高影响因子
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
·
2021
·
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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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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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Jin Zhang,Suyan Li,Xiaoyu Hu,Lijun Zhang,Yu Chen,Manman Mu,Yadong Bi
It has been a blind spot to compare the modification effect of ester and acid on inorganic photo catalysts. Traditional method is always laborious to realize organic-inorganic combination by the esterification of carboxylic acids with surficial hydroxyls of nano-TiO 2 . Here, a detailed comparison was conducted using m -dipyridyl benzene skeleton (MPB) molecules containing ester or carboxylic acid groups to modify TiO 2 surface with solvothermal method . The result shows that the modification did not affect the crystal structure of TiO 2 , but formed uniformly distributed organic/inorganic binding sites and non-binding sites on its surface, thus the intrinsic UV response activity of TiO 2 can be retained. Combining with the visible light activity of organic/inorganic binding sites, a perfect photogenerated charge transfer system with matching energy levels is constructed, hence the photocatalytic performance is greatly improved. By contrast, the ester derivative of MPB (shorted as EPB) is easier to form stable organic species on the surface of nanoparticles and shows higher catalytic activity than the carboxylic acid derivative of MPB (shorted as APB), thus the study first demonstrated that the low cost and applicable photocatalyst can be obtained with much low dosage of organic modifiers containing ester groups, hence much significant in the design and optimization of catalyst surface. Compared with other reported methods, this modification has the advantages of simple process, low cost, no consumption of precious metals , ease of obtaining high activive and stable catalysts, so it is more prospective in waste water treatment.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Wanying Xie,Ji Li,Feiyun Sun,Wenyi Dong,Zijun Dong
Aiming at the fouling problem of PVDF membrane, one novel integrated strategy was used for the first time, including hydrophilic membrane modification and low-pressure operation. Permeability and anti-fouling ability of PVDF were simultaneously improved by nano-TiO 2 embedment. From perspective of operating condition optimization, the concepts of critical flux (J C ) and threshold flux (J TH ) were recommended as fouling-control tools. The J C and J TH of PVDF-TiO 2 membrane were tested by two constant pressure-steps methods, i.e. Constant pressure-step method and Alternating constant pressure-step method. Three indicators, consisting of instant FTTT curves, dFlux/dt condition and TMP-Flux ave curve, were employed to evaluate the J C and J TH of PVDF-TiO 2 membrane. In brief, the J C and J TH of PVDF-TiO 2 were 10.62 and 23.91 L/(m 2 ·h), respectively, which were nearly 3 times of PVDF membrane. Fouling resistance results displayed that protein irreversible fouling of two PVDF membranes were effectively reduced by J C mode and J TH mode. Besides, reversible fouling of PVDF-TiO 2 membrane was controlled well by J C mode meanwhile. The pure water filtration line (PWF line) and the normalized resistance were both used to judge the form of J C of two membranes. As compared with PVDF, it was speculated the enhancement of J C and J TH mainly related to the better hydrophilicity and local hydraulic condition of PVDF-TiO 2 modified membrane.
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Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 2
·339-349
·
IF 5.693
Lin Chunling,Liu Boyang,Pu Liuyue,Sun Yan,Xue Yanli,Chang Mulan,Li Xin,Lu Xingyu,Chen Rong,Zhang Jiaoxia
As a highly active photocatalyst, g-C 3 N 4 /TiO 2 heterojunction nanocomposites were in situ synthesized by hydro-thermal method and calcination using melamine as precursors. The morphology and chemical structure of the prepared photocatalysts were characterized by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), SEM, UV-vis, and photoluminescence analysis (PLA). At last, the photocatalytic activities of g-C 3 N 4 /TiO 2 nanocomposites to remove fluoride under simulated visible light were evaluated. Results showed that the fluoride removal rate of the prepared g-C 3 N 4 /TiO 2 was about three times than pure g-C 3 N 4 due to the rapid charge transfer and the efficient separation of photogenerated electron-hole pairs in heterojunctions between g-C 3 N 4 and TiO 2 . Graphical abstract Heterojunction g-C 3 N 4/ TiO 2 display the excellent fluoride removal rate due to the rapid charge transfer and efficient separation of electron-hole pairs.
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Polymer-Plastics Technology and Materials
·
2021
·
IF 2.371
Yan Zhang,Zaifeng Shi,Tianyi Sun,Dashuai Zhang,Xiaopeng Zhang,Xiaoxue Lin,Chen Li,Lili Wang,Junjun Song,Qiang Lin
A novel photodegradable Methylene Blue (MB)/TiO2/PVC film was prepared. The physical and mechanical properties, hydrophilicity, and the thermal stability of the film before irradiation were characterized. The photodegradability test was performed by using gel permeation chromatography (GPC), infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), and scanning electron microscopy (SEM). Compared with TiO2/PVC, MB/PVC, and PVC, the MB/TiO2/PVC film showed the higher photodegradability. The weight loss rates of TiO2/PVC, MB/PVC, and MB/TiO2/PVC films after irradiation for 30 h were 8.94%, 15.84%, and 27.55%, respectively, while that of PVC was only 2.12%. The decline rates of Mw and Mn of MB/TiO2/PVC (MB 2 wt%, TiO2 1 wt%) were 35.68% and 65.38%, respectively. Due to the excellent degradability and usability of the MB/TiO2/PVC film, the photocatalytic technology is a feasible and effective way to solve “white pollution”.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 8
·10951-10962
·
IF 2.478
Zhang Yakang,Liang Xuan,Jiang Mengting,Liang Qian,Xu Song,Yao Chao,Zhou Man,Li Zhongyu
Based on the three-dimensional ordered macroporous titanium dioxide (3DOM-TiO 2 ), a series of gold-embedded 3DOM-TiO 2 ( n Au@3DOM-TiO 2 ) with controlled Au loading amount ( n = 0.24, 1.2, 2.4, 4.8, 12, and 24 wt%) was successfully fabricated via in-situ pyrolysis for the first time. Compared with the surface-modified Au/3DOM-TiO 2 by traditional impregnation–reduction route, this body-doped Au@3DOM-TiO 2 structure exhibited smaller particle size and better dispersive property which are important for photocatalysis. Therefore, the photocatalytic activities of n Au@3DOM-TiO 2 have been tested and the optimized photocatalyst of 4.8Au@3DOM-TiO 2 was identified. A possible mechanism of Au@3DOM-TiO 2 for the enhanced photoactivity was well discussed. The present work demonstrated a unique “gold-embedded” interface with potential advantages of highly dispersed, anti-aggregation, easy recovery, and enhanced catalytic performance, and that this approach could provide an ideal platform for the further design of noble metal-doped semiconductors.
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