Science of Advanced Materials
·
2022
·Vol. 14
·期 3
·576-580
·
IF 1.067
Tang Si-Lu,Liu Ya-Lin,Li Xu-Ming,Chen Qian-Wen,Chen Heng-Yu,Zhou Ji-Li,Chen Liang,Gu Zi-Yi,Shao Shi-Xing,Qiao Pei-Zhi,Shen Guo-Dong,Yang Bing-Chuan
The core–shell TiO2 nano-layer spheres were synthesized by hydrothermal method without surfactant, using tetraisopropyl titanate, diethylenetriamine and water as the capping agents. The structure of the products was characterized with X-ray diffraction (XRD), transmission
electron microscope (TEM) and scanning electron microscopy (SEM). The possible formation mechanism and electrocatalytic degradation characters of the products were also discussed.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Guoxiang Yang,Haibo Yin,Wenhua Liu,Yuping Yang,Quan Zou,Liulin Luo,Huiping Li,Yuning Huo,Hexing Li
The hybrid Ag/TiO 2 -N photocatalyst was prepared via a supercritical solvothermal process in ethanol fluid. The simultaneous achievement of reduction of Ag + ions and N-doping in silver-ammonia complex solution led to the uniform distribution of Ag nanoparticles stably combined with the surface of TiO 2 -N substrate. As a result, the visible-light photocatalytic inactivation of Acinetobacter baumannii was facilitated via the enhanced visible light harvesting and the high separation efficiency of photo-induced charge carriers. By means of the main active species of O 2 − radical, the synergistic effect of Ag nanoparticles and TiO 2 -N could induce the structure change of bacteria with the leakage of K + ions as well as the mineralization of cell membrane with the elimination of self-repair function, leading to the final cell death. In comparison, the bactericidal activity of Ag nanoparticles and TiO 2 -N under UV light irradiation was due to the intrinsic efficiency and the high light harvesting, respectively. The photothermal effect of Ag nanoparticles in the near-IR light region could be possibly remained by TiO 2 -N substrate to achieve the antibacterial activity. Furthermore, Ag/TiO 2 -N photocatalyst played great bactericidal effect for kinds of bacteria, implying the applicable future to the medical disinfection.
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CHEMOSPHERE
·
2022
·
IF 8.943
Fengjie Chen,Anen He,Yarui Wang,Wanchao Yu,Haoze Chen,Fanglan Geng,Zhunjie Li,Zhen Zhou,Yong Liang,Jianjie Fu,Lixia Zhao,Yawei Wang
Photo-induced holes (h + ) oxidation is an efficient approach for perfluorooctanoic acid (PFOA; C 7 F 15 COOH) removal. To maintain a high amount of h + on the surface of photocatalysts participating in the PFOA photodegradation could be a critical issue. Herein, a highly efficient spherical BiOBr-modified nano-TiO 2 (P25) was synthesised and used for PFOA photodegradation through direct oxidation with h + . A high number of h + could be generated and remain on the surface of P25/BiOBr due to the appropriate position of the conduction band (CB) and valence band (VB) levels between P25 and BiOBr. Meanwhile, PFOA molecules were coordinated to the P25/BiOBr's surface via unidentate binding, being directly activated and oxidised by h + , resulting in a decomposition yield of 99.5% (100 mg/L) under simulated solar light irradiation within 100 min, at the initial pH condition (3.5). A stepwise photodegradation pathway was proposed due to the significant intermediates detected as the short-chain perfluorinated carboxylic acids (C2–C7). Reactive oxygen species (ROS) generation, scavenging and trapping analysis indicated that the direct oxidation on h + followed PFOA degradation. In a real aqueous environment of Tangxun lake (adjusted pH 3.5), stable common anions and natural organic matter (NOM) would restrain the PFOA photodegradation. However, adding 10 mg/L of NO 3 − or HA could reduce the inhibition effect of PFOA photodegradation. These findings gave an alternative strategy to drive an h + directly oxidation to treat PFOA contaminated water bodies.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xueqin Wang,Ying Liu,Helong Xu,Man Dai,Peng Qiao,Wenyi Wang,Yanxiu Liu,Hua Song
Surface-decorated three-dimensional dendritic fibrous nanosilica (DFNS)/TiO 2 are novel materials that may be used in degrading organic pollutants. The DFNS nanosphere substrate was synthesized using a one-pot hydrothermal technique and polyethylene glycol-block-polypropylene glycol-block-polyethylene glycol/TiO 2 (F127/TiO 2 ) thin films were prepared via simple solvent volatilization-induced self-assembly method. The DFNS spheres and F127/TiO 2 thin film were then combined and further annealed to obtain DFNS/TiO 2 nanospheres. The as-synthesized DFNS mesoporous silica spheres exhibited unique fibrous morphologies, high specific surface areas, and uniform distributions. Standard characterization studies of the obtained mesoporous DFNS/TiO 2 catalysts revealed that these catalysts were composed of amorphous SiO 2 and anatase TiO 2 with high specific surface areas of 525.3 m 2 ∙g −1 . The phenol degradation efficiencies of these catalysts were also studied. The amount of tetrabutyl titanate used as the Ti source was adjusted to obtain the optimal material with a first-order degradation rate constant of 0.0229 min −1 . Thus, these surface modification DFNS/TiO 2 materials display excellent catalytic properties, with potential applications in the fields of organic pollutant degradation and energy.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Dingyi Wang,Tingting Zhi,Lihong Liu,Li Yan,Wei Yan,Yinyin Tang,Bin He,Ligang Hu,Chuanyong Jing,Guibin Jiang
Nanomaterials play a crucial role in various areas due to their extraordinary chemical and physical properties. Loading microscopic nanomaterials onto macrostructures is inevitable for their implementation from laboratory experiments to practical applications. Nevertheless, the geometries of conventional supporting structures are usually limited and nanomaterials are easy to be inhomogeneously distributed, aggregated, and lost. Therefore, controllably configuring nanomaterials into sophisticated three-dimensional macroscopic structures without sacrificing their inherent properties remains challenging. Here we utilize the advantages of 3D printing technology to realize this purpose. As a proof-of-concept, the application of 3D stereolithography printed macrostructures containing TiO 2 nano particles (TiO 2 NPs) for direct adsorption removal of As(III) in water was demonstrated. The morphology and distribution of TiO 2 NPs mounted on printed macrostructures were initially characterized. Then batch adsorption experiments were conducted to investigate the effect of the 3D printing process, TiO 2 NPs doped concentration and TiO 2 NP size as well as adsorption kinetics and isotherms. We also demonstrated that 3D printed adsorption structures could be easily reused over 10 times and were effective for raw arsenic-polluted groundwater samples. Our findings show that 3D printing provides a promising route to design and fabricate customized macrostructures endowed with specific properties of nanomaterials.
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Desalination and Water Treatment
·
2016
·
IF 1.272
Song Li,Lei Fang,Miaomiao Ye,Yan Zhang
For norfloxacin removal in aquatic environment, TiO2 particles (P25) were modified via surface molecular imprinting technique to improve the adsorption property and sustainable use by photocatalytic regeneration. Orthogonal experiment was adopted to quantify the significance of preparation factors and determine the optimum preparation conditions. The adsorption of norfloxacin on the molecular imprinted particles (MIPs), the non-imprinted particles (NIPs), and P25 fitted the second-order adsorption model and Langmuir model well. The MIPs showed a higher adsorption capacity toward norfloxacin than the NIPs and P25. The adsorption rate constant, maximum adsorption capacity, and Langmuir constant of the MIPs toward norfloxacin were 0.49 g mg−1 min−1, 2.99 mg g−1, and 2.4 L mg−1, respectively. Removal efficiencies for norfloxacin, ciprofloxacin, carbamazepine, and phenol by the MIPs were 76.99, 78.81, 7.87, and 2.68%, respectively, which indicated that the MIPs had higher affinity toward norfloxacin and fluoroquinolones with similar structures. Moreover, the MIPs exhibited the photocatalytic property and could be regenerated by UV irradiation with stable removal efficiency for norfloxacin in five adsorption–regeneration cycles.
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RSC Advances
·
2016
·Vol. 6
·期 76
·72659-72669
·
IF 3.289
Chao Li,Weiyi Yang,Lingmei Liu,Wuzhu Sun,Qi Li
Plasmonic photocatalysis could provide a promising solution to the two fundamental problems of current TiO2-based visible-light photocatalysis on low photocatalytic efficiency and low usage of solar illumination. But till now, most plasmonic photocatalysts have relied on noble metal nanostructures of Au or Ag due to their easy synthesis and efficient absorption of visible light. In this study, a TiN/TiO2 nanocomposite photocatalyst was synthesized by the in situ growth of TiO2 nanoparticles on TiN nanoparticles with a fluorine-free, vapor-phase hydrothermal process. In this composite photocatalyst system, the desirable visible light absorption could be attributed to the LSPR effect of a nanostructured TiN phase. Thus, a plasmonic photocatalyst without noble-metal components was developed, and its good visible light photocatalytic activity was demonstrated by both the photodegradation of organic pollutants of RhB and 4-NP and the disinfection of microorganisms of E. coli. From the energy alignment analysis, hot electrons were expected to be completely injected from TiN to TiO2 once they were excited above the Fermi energy level of TiN because no barrier existed, resulting in better electron injection efficiency than previous reported noble-metal-based plasmonic photocatalysts.
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Coatings
·
2023
·Vol. 13
·期 2
·317
·
IF 3.4
Yan Zhang,Tianyi Sun,Dashuai Zhang,Chen Li,Jinrui Liu,Bangsen Li,Zaifeng Shi
The fact that the use of a large number of plastic products has brought serious pollution to the environment has always been the focus of global attention. The development of photocatalytic degradable plastics is one of the effective ways to solve the problem of “white pollution”. In this work, La3+modified TiO2nanoparticles were prepared by ball milling and characterized. La3+/TiO2was mixed with Polyvinyl chloride (PVC) plastic to make a photodegradable composite film, and the photodegradation performance and mechanical properties of films were evaluated. The photodegradable films were characterized by infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), and scanning electron microscopy (SEM). After 30 h UV irradiation, the weight loss rate of the PVC was only 2.12%, while that of the TiO2/PVC reached 8.94%. The accelerating of the degradation rate was due to the mixing of TiO2into PVC. As for the La3+/TiO2/PVC composite film, when the mass percentage of La3+/TiO2was 1.5%, the weight loss rate of La3+/TiO2/PVC sample reached a maximum of 17.78%, which was eight times the degradation rate of PVC and two times the degradation rate of TiO2/PVC. The La3+/TiO2/PVC film showed good photodegradability. La is a transition metal element with a special 4f electronic structure. The reaction mechanism of photodegradation of PVC by the interaction of La3+and TiO2were discussed.Keywords:La3+modified TiO2;La3+/TiO2/PVC composite film;ball milling method;photodegradation
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 6
·4676-4681
·
IF 1.556
Sun Na,Zhao Xiang,Xiao Zhenggang
In order to improve the compatibility between nanoparticles and polymer matrix, a feasible processing way for grafting polyimides (PI) on the surface of hollow TiO2 particles was developed. Hollow TiO2 spheres were prepared by using polystyrene-methyl acrylic acid
latex as a template starting from tetrabutyl titanate. Surface graft of azide-decorated hollow TiO2 spheres with welldefined alkyne-terminated PI were achieved by “click” chemistry in three steps: (1) choloromethylation and azidization of hollow TiO2, (2)
preparation of alkyne-terminated PI by polycondensation, (3) click coupling between the azidized hollow TiO2 and the alkyne-terminated PI under the catalysis of CuSO4/sodium ascorbate. Fourier transform infrared (FTIR) and Nuclear Magnetic Resonance (1HNMR) spectra were
used to illustrate quantitative transformation of the PI brushes on hollow TiO2 particles into the desired functional group. The morphology of hollow TiO2-PI composite particles was characterized by transmission electron microscopy (TEM) which showed the irregular hollow
structure. The results indicate that the grafting of polymer chains with thermostability and flame retardance on the surface of hollow TiO2 sphere is successful.
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Chemical Engineering and Processing-Process Intensification
·
2019
·
IF 3.031
Suqi Zhang,Jie Zhang,Jian Sun,Zhiyong Tang
A novel capillary microphotoreactor (MPR) packed with TiO 2 -coated glass beads was developed in this work and its photocatalytic performance was evaluated using degradation of methylene blue (MB) as a model reaction. As compared to conventional wall-coated MPR, the use of glass beads as packing material not only provides a larger surface area for catalyst immobilization and shortens the mass transfer route, but also introduces flow perturbation. An appropriate size of glass beads should be chosen for packing because there is a tradeoff between increased catalysts coating area and decreased light penetration. It was found out that nearly 100 % degradation efficiency could be achieved in 80# glass beads packed MPR within short residence time (20 s), which was more than 2 orders of magnitude larger than value obtained in wall-coated MPR under the same operational conditions. Moreover, the packed MPR showed good durability, which declined by about 17 % after 6 h of operation and then remained stable for next 19.5 h.
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Frontiers in Chemistry
·
2018
·
IF 4.155
Zhu Chonghui,Cheng Xiaoli,Dong Xin,Xu Ying ming
PANI/TiO2 nanocomposites spheres were synthesized using a simple and efficient one-step hydrothermal process. The morphology and structure of PANI/TiO2 nanocomposites spheres were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. The PANI/TiO2 nanocomposite sphere-based sensor exhibits good selectivity, sensitivity (5.4 to 100 ppm), repeatability, long-term stability and low detection limit (0.5 ppm) to ammonia at room temperature (20 ± 5°C). It also shows a good linearity relationship in the range of 0.5–5 and 5–100 ppm. The excellent NH3 sensing performance is mainly due to the formation of the p-n heterostructure in the nanocomposites.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Ding Wang,Jialin Yang,Liping Bao,Yu Cheng,Liang Tian,Qingxiang Ma,Jingcheng Xu,Hui-Jun Li,Xianying Wang
Hydrogen (H 2 ) molecules are easy to leak during production, storage, transportation and usage. Because of their flammability and explosive nature, quick and reliable dectection of H 2 molecule is of great significance. Herein, an excellent H 2 gas sensor has been realized based on Pd nanocrystal sensitized two-dimensional (2D) porous TiO 2 (Pd/TiO 2 ). The formation of 2D porous TiO 2 with the removal of graphene oxide template has been monitored by an in-situ transmission electron microscope. It is found that the size of the GO template can be almost completely replicated by 2D TiO 2 . The Pd/TiO 2 sensor exhibited an instantaneous response and a satisfactory low detection limit for H 2 detection. These excellent gas-sensing performances (good selectivity, unique linearity response and high stability) can be attributed to the unique 2D porous structure and the synergistic effect between oxidized Pd and TiO 2 , including the unique adsorption properties of O 2 or/and H 2 on Pd/TiO 2 , the reaction between PdO and H 2 gas, and the regulated depletion layer arising from p-type PdO to n -type TiO 2 . This work demonstrates a rational design and synthesis of highly efficient H 2 sensitive materials for energy and manufacturing security.
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