CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Qinglong Zeng,Xiao Wang,Xiaofeng Xie,Guanhong Lu,Yan Wang,Shun Cheng Lee,Jing Sun
Differing from the photocatalysis of liquid contaminant, the capture of gaseous molecule is an essential factor on the photocatalytic activity because of the fast and random motion of gaseous molecule. TaS 2 is a two-dimensional material with good conductivity and large specific area, which are beneficial to the adsorption of gaseous pollutant and the separation of photo-induced e − -h + pairs. Here, P25/TaS 2 (P25: commercial TiO 2 ) was synthesized for the first time to explore the effect of the addition of TaS 2 on the photocatalytic degradation of gaseous acetaldehyde. It turned out that the existence of TaS 2 provided two merits: on the one side, the adsorptive capacity of P25/TaS 2 for gaseous acetaldehyde boosted greatly with the highest adsorptive amount of 234.4 mL, which was three times of that of P25 (76.4 mL); on the other side, the separation efficiency of e − -h + pairs of P25/TaS 2 also increased extremely with the highest photo-current response of 15.5 μA/cm 2 , which was almost four times of that of P25 (4.2 μA/cm 2 ). These two merits made P25/TaS 2 have superior photocatalytic activity for the degradation of gaseous acetaldehyde with the highest removal ratio of 98%, which was twice of that of P25 (48%). The cyclic experiments verified that P25/TaS 2 could keep excellent cycling stability after 6 cycles usage. In addition, proved by electron spin resonance (ESR) analyses and radicals quenching tests, superoxide radical was the decisive active species for the degradation of gaseous acetaldehyde compared with hydroxyl radical. Briefly, this work not only created the pioneer of the application of TaS 2 in the photocatalytic field but also verified TaS 2 an efficient co-catalyst in gaseous photocatalysis.
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Journal of Materiomics
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2018
·
IF 0
Qionglian Yang,Mingyu Hu,Jun Guo,Zhenhua Ge,Jing Feng
s Ag/AgCl/TiO 2 nanocomposite was synthesized through the combination of sol-gel process and hydrothermal (HT) method followed by ion exchange method in the paper. Transmission electron microscope, UV–vis absorption property and X-ray diffraction were utilized to characterize the morphology, optical absorption property and phase structure of the as-prepared photocatalysts. The morphological and performance studies of Ag/AgCl/TiO 2 revealed that a well-interconnected mixed phase heterojunction photocatalyst was achieved through as-prepared TiO 2 and the subsequent ion exchange method. By the degradation of Rhodamine B under xenon lamp, Ag/AgCl/TiO 2 exhibited a significant enhancement in photocatalytic activity compared with TiO 2 and Ag/TiO 2 . The band gap of Ag/AgCl/TiO 2 can reach to 2.53eV compared with 3.22eV of the prepared TiO 2 . Furthermore, the synthesis process and photoreaction mechanisms of TiO 2 , Ag/TiO 2 and Ag/AgCl/TiO 2 photocatalysts were proposed. It demonstrated that the enhancement of photocatalytic was mainly due to the reducing of electron-hole recombination in Ag/AgCl/TiO 2 .
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Nanomaterials
·
2018
·Vol. 8
·期 6
·415
·
IF 3.504
Wei Li,Hao Ding,Hua Ji,Wenbin Dai,Jianping Guo,Gaoxiang Du
A photocatalytic active CdS-TiO2heterostructure composite was prepared by hydrothermal method and its morphology and properties were characterized. Results indicate that the CdS nanoparticles deposited on the surface of a TiO2nanoparticles, which was in anatase phase. The particle scale of both of the components reached approximately 15 nm. In comparison to pure TiO2(410 nm), the light absorption edge of the heterostructure composite was 550 nm, which could extend the light response from UV to the visible region. Under visible light irradiation, the degradation efficiency of tetracycline hydrochloride by the CdS-TiO2composite achieved 87.06%, significantly enhancing photocatalytic activity than the as-prepared pure TiO2and commercial TiO2(Degussa P25). This character is attributed to the synergetic effect of these two components in the absorption of visible light.Keywords:CdS-TiO2heterostructure composite;photocatalyst;tetracycline hydrochloride
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BIOSENSORS & BIOELECTRONICS
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2018
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IF 8.173
Yunfei Tang,Yun Chai,Xiaoqiang Liu,Lele Li,Liwei Yang,Peipei Liu,Yanmei Zhou,Huangxian Ju,Yunzhi Cheng
In this work, a CuS-TiO 2 heterojunction composite was prepared by dispersedly depositing CuS nanoparticles on TiO 2 nanospheres surface with a hydrothermal method , and was then used to construct a photoelectrochemical (PEC) aptasensor for sensitive detection of microcystin-LR (MC-LR) in aquatic environment. The energy bands of CuS nanoparticles and spherical anatase TiO 2 were well matched, which enhanced the photo-to-current conversion efficiency. The composite exhibited the enhanced visible light absorption , the improved separation of photo-generated charges, and the reduced self-aggregation of CuS nanoparticles, leading to the enhanced photocurrent response. The PEC aptasensor was constructed by immobilizing CuS-TiO 2 composite on ITO electrode with chitosan film that further covalently bound aminated aptamer. After the target, microcystin-LR (MC-LR) as an analyte model, was captured by the aptamer on the aptasensor, it could be oxidized by the photo-generated hole to impede the electron-hole recombination and further amplify the photocurrent. The PEC aptasensor showed superior analytical performance for MC-LR with a linear range of 5.0 × 10 −5 nM to 250 nM and a detection limit of 2.0 × 10 −5 nM. The detection results with the aptasensor for practical water samples indicated its promising application in environmental monitoring.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 6
·e4351
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IF 3.581
Qingqing Lu,Wenhui Peng,Suhang Xun,Minqiang He,Ruliang Ma,Wei Jiang,Wenshuai Zhu,Huaming Li
The aggregation of nanoparticle catalysts is one of the main problems in catalytic reactions. In this study, a series of TiO 2 nanoparticle catalysts with various dispersions were prepared and applied in the catalytic oxidation of dibenzothiophene (DBT) systems. Compositions and structures of the as-prepared samples were analyzed by means of wide-angle X-ray diffraction, Raman and X-ray photoelectron spectroscopies. The dispersions of TiO 2 nanoparticles were controlled by calcining at various temperatures and verified using transmission electron microscopy. It was found that the activities of TiO 2 nanoparticles in the catalytic oxidation of DBT were positively correlated with the dispersions. TiO 2 nanoparticles calcined at 500 °C (500-TiO 2 ) showed the best catalytic activity and the oxidation of DBT reached 99.8% under mild conditions. Based on the results of GC–MS analysis, radical trapping experiments and electron spin resonance spectra, • O 2 − radicals were proved to be the main active species in the oxidation process, and a mechanism is proposed. Meanwhile, the recycling performance of 500-TiO 2 was investigated, and no obvious decrease was observed after six recycles.
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RSC Advances
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2019
·Vol. 9
·期 2
·721-729
·
IF 3.049
Yu An,Pengwu Zheng,Xiaofei Ma
A novel floating visible-light photocatalyst (HGMs–TiO2/Ag3PO4) composite was prepared using amino modified low-density hollow glass microspheres (HGMs) as carriers to disperse and support TiO2 and Ag3PO4 photocatalysts. The surface morphology, crystal structure and optical properties of the HGMs–TiO2/Ag3PO4 composites were characterized and the Ag3PO4 content on the surface of the microspheres was determined by atomic absorption spectrometry (AAS). Methylene blue (MB) was chose as the organic pollutant to investigate the visible-light catalytic properties of the HGMs–TiO2/Ag3PO4 composites. For HGM composite photocatalysts, when the theoretical mass ratio of TiO2 to Ag3PO4 on the surface of HGMs is 1 : 1.5, the visible-light catalytic activity of the composite is superior to pure Ag3PO4 and a TiO2/Ag3PO4 photocatalyst with a mass ratio of 1 : 1.5 under the same conditions, due to the increased light-contact area and the photocatalytic active sites, since the TiO2 and Ag3PO4 particles can be well dispersed on the surface of the floating HGMs. Furthermore, the deposits of TiO2 and Ag3PO4 on the HGM surface form a heterostructure, facilitating the separation of electron–hole (e− – h+) in the energy band, and elevating the photocatalytic activity and cycle stability of Ag3PO4. This work indicates that floating HGMs–TiO2/Ag3PO4 composites could become a promising photocatalyst for organic dye removal due to the low cost and high visible-light responsiveness.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Zhao Jiang,Xiang Gong,Bin Wang,Zhiqiang Wu,Tao Fang
Liquid organic hydrogen carrier (LOHC) is considered as a promising candidate for large-scale hydrogen storage. In this work, we found that Pt/TiO 2 catalysts exhibited better catalytic activity and selectivity compared to Pd/TiO 2 and commercial Pd/Al 2 O 3 catalysts in the dehydrogenation of dodecahydro-N-ethylcarbazole (12H-NECZ) at 453 K. The catalytic activity of the noble metal catalysts followed the trend of Pt/TiO 2 > Pd/TiO 2 > Rh/TiO 2 > Au/TiO 2 > Ru/TiO 2 . Compared with the commercial Pd/Al 2 O 3 , Pt/TiO 2 greatly improved the selectivity and conversion rate, the reaction time was also shortened. In addition, kinetics calculation was carried out to obtain fundamental reaction parameters. It was found that the third step of 4H-NECZ dehydrogenation to NECZ was the rate-limiting step of the entire dehydrogenation reaction for all catalysts.
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TALANTA
·
2018
·
IF 4.244
Yayun Hong,Qiliang Zhan,Chenlu Pu,Qianying Sheng,Hongli Zhao,Minbo Lan
In this work, hollow magnetic macro/mesoporous TiO 2 nanoparticles (denoted as Fe 3 O 4 @H- f TiO 2 ) were synthesized by a facile “hydrothermal etching assisted crystallization” route to improve the phosphopeptide enrichment efficiency. The porous nanostructure of TiO 2 shell and large hollow space endowed the Fe 3 O 4 @H- f TiO 2 with a high surface area (144.71 m 2 g −1 ) and a large pore volume (0.52 cm 3 g −1 ), which could provide more affinity sites for phosphopeptide enrichment. Besides, the large pore size of TiO 2 nanosheets and large hollow space could effectively prevent the “shadow effect”, thereby facilitating the diffusion and release of phosphopeptides. Compared with the hollow magnetic mesoporous TiO 2 with small and deep pores (denoted as Fe 3 O 4 @H-mTiO 2 ) and solid magnetic macro/mesoporous TiO 2 , the Fe 3 O 4 @H- f TiO 2 nanoparticles showed a better selectivity (molar ratio of α -casein/BSA up to 1:10000) and a higher sensitivity (0.2 fmol/μL α -casein) for phosphopeptide enrichment. Furthermore, 1485 unique phosphopeptides derived from 660 phosphoproteins were identified from HeLa cell extracts after enrichment with Fe 3 O 4 @H- f TiO 2 nanoparticles, further demonstrating that the Fe 3 O 4 @H- f TiO 2 nanoparticles had a high-efficiency performance for phosphopeptide enrichment. Taken together, the Fe 3 O 4 @H- f TiO 2 nanoparticles will have unique advantages in phosphoproteomics analysis.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Dongxing Tan,Jianling Zhang,Jinbiao Shi,Shaopeng Li,Bingxing Zhang,Xiuniang Tan,Fanyu Zhang,Lifei Liu,Dan Shao,Buxing Han
To develop photocatalysts with desirable compositions and structures for improving the efficiency and selectivity of CO2 conversion to CH4 under mild conditions is of great importance. Here, we design an effective photocatalyst of bimetal (Ag/Pd) nanoalloys supported on nitrogen-doped TiO2 nanosheet for CO2 conversion. Such a novel photocatalyst combines multiple advantages of abundant Ti3+ ions, oxygen vacancies, and substitutional nitrogen that are favorable for catalyzing CO2 reduction. It was found that CO2 could be efficiently transformed to CH4 under mild conditions, i.e., in aqueous solution and at atmospheric pressure and room temperature. The maximum production rate of CH4 can reach 79.0 μmol g–1 h–1. Moreover, the Ag/Pd bimetals supported on N-doped TiO2 nanosheet exhibit high selectivity to CH4. The as-synthesized photocatalyst can be well recycled for CO2 reduction.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 26
·26259-26266
·
IF 2.8
Lei Jinfeng,Deng Lei,Li Xinying,Xu Yongbin,Li Defu,Mu Changdao
TiO 2 shows great potential as ideal and powerful photocatalyst to degrade and eliminate harmful organic pollutants from waste water. It is desirable to prepare anatase TiO 2 with good aqueous solubility and photocatalytic activity for water decontamination. In this paper, water-soluble TiO 2 nanoparticles were successfully prepared using polytetramethylene ether glycol (PTMG), poly(ethylene glycol) (PEG), and poly(propylene glycol) (PPG) as stabilizers. The anatase phase of TiO 2 was well controlled by introduction of HCl in the reaction system. The results showed that all the polymer-capped TiO 2 were well dissolved in water and their aqueous solutions could maintain stable for more than 2 months. The photocatalytic activities of polymer-capped TiO 2 were evaluated by monitoring the degradation of Rhodamine B (RhB) with Degussa P25 as a control. The results showed that all the polymer-capped TiO 2 presented better photocatalytic activity than that of Degussa P25. PTMG capped TiO 2 exhibited the longest average lifetime of charge carriers, indicating the lowest charge recombination rate. Thus, PTMG capped TiO 2 presented the best photocatalytic activity. In summary, PTMG, PEG, and PPG can be used as stabilizers to prepare water-soluble TiO 2 . PTMG is an ideal stabilizer for the synthesis of water-soluble TiO 2 with good photocatalytic activity.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 16
·14161-14169
·
IF 2.324
Xiong Xiaoying,Zhou Zhou,Zhang Zhao,Yang Hui,Zhang Qilong
In this study, rod-like TiO 2 filler was synthesized one-step hydrothermal method and was incorporated into P(VDF-TrFE-CFE) polymer matrix to obtain composites with high dielectric constant. It is found that the morphology and content of TiO 2 fillers play a vital role in tailoring the performance of the as-fabricated composites. The rod-like TiO 2 assembled by numerous nanoparticles maintained its primary shape and homogenously distributed in the matrix, thus achieved sophisticated interface and strong interfacial adhesion with P(VDF-TrFE-CFE) polymer, which together contributed to a dramatic improvement in permittivity of composites. Typically, the dielectric constant of composite with 10 vol% rod-like TiO 2 reaches 160 at 100 Hz, in contrast to 102.5 for the composite with 10 vol% commercial TiO 2 and 47 for pristine P(VDF-TrFE-CFE). This study provides a solution for obtaining high-k dielectric composites with low dielectric loss, which is highly desired for advanced electronic devices.
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JOURNAL OF SOLID STATE CHEMISTRY
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2018
·
IF 2.179
Xiaodan Li,Wendi Zhang,Bo Chen,Gaoxiang Wu,Jiaxiang Cai,Huiqing Wu,Chunhai Jiang
Lithium‐sulfur batteries have stimulated great attention as an advanced power system for scale storage requirements due to the overwhelming energy density . However, the capacity degradation caused by polysulfide shuttle and volume expansion still impedes the practical application. Herein, we designed and fabricated a facile TiO 2 embedded sulfur bulks@MnO 2 nanosheets composite as scalable cathode for long-cyclic lithium-sulfur batteries. The TiO 2 nanoparticles were embedded in sulfur bulks, which played important roles in the coverage of the uniform MnO 2 nanosheets. The embedded TiO 2 sites and external MnO 2 nanosheets brought out the physic trapping and chemical synergistic encapsulation of polysulfides. Such a composite cathode exhibited high reversible capacity of 1289 mAh g −1 at 0.1 C and long-term cycling stability at high rate condition (430 mAh g ‐1 after 500 cycles at 2 C). This work thus sheds new light on a scalable way to improve the electrochemical performance of sulfur cathode.
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