APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Yanming Yang,Ming Liu,Shitong Han,Hailing Xi,Chao Xu,Rusheng Yuan,Jinling Long,Zhaohui Li
TiO 2 spherical shells with both inner and outer surface modified by graphene have been successfully constructed through a stepwise loading method. This double-sided modification method greatly increases the contact area of the shell with graphene sheets, which is beneficial for graphene to separate more photoelectrons from both the inner and outer sides of the shell simultaneously. The results of photocatalytic reduction of CO 2 into CO indicate that the modification effects of inner and outer wall of TiO 2 shell by graphene seem to be relatively independent to each other. As a result, compared with the traditional single-sided modified samples, even these optimal ones, the loading of graphene on the other side of TiO 2 shell can still improve the photocatalytic reduction performance. Moreover, the optimal dosage of graphene on one side of shell surface is always maintained, without being affected by the graphene usage on the other side. This work indicates that the unique heterojunction obtained by graphene double-sided modification is advantageous to enhance the photocatalytic CO 2 reduction performance and expected to be extended to the construction of other photocatalysts.
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高影响因子
PROGRESS IN ORGANIC COATINGS
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2020
·
IF 4.469
Zhiping Huang,Wenjie Zhao
Epoxy resin (EP) composite coatings enhanced with hexagonal boron nitride (HBN) nano-sheets, TiO 2 particles and HBN-TiO 2 hybrid material were fabricated successfully on the surface of 304L stainless steel. The structural and morphological features of HBN, TiO 2 and HBN-TiO 2 hybrid obtained from mechanical peeling and sol-gel method were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), Raman spectroscopy, XRD patterns, FT-IR spectra and XPS spectra. Moreover, tribological characteristic of composite coatings was investigated by UMT-3 tribometer. Mechanical behavior, worn surface, steel ball surface and debris size distribution of composite coatings were detected to investigate the tribological mechanism. The results demonstrated that HBN/EP, TiO 2 /EP and HBN-TiO 2 /EP composite coatings showed remarked promotion of mechanical behavior compared with the neat EP, especially for the improvement of hardness. The HBN-TiO 2 /EP composite coating, whose wear rate decreased by 65.8 % in comparison with the neat EP, manifested prominent tribological performance ascribed to the load carrying capacity of TiO 2 and the reduction of self-lubricating effect on the size of debris.
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Applied Nanoscience
·
2020
·Vol. 10
·期 12
·4415-4426
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IF 2.88
Duan Jihai,Pan Peng,Xue Kang,Zhao Hui,Zhang Zisheng,Wang Weiwen
B-C-N-TiO 2 catalysts with intermediate band gap and heterojunction were prepared by sol–gel method. The crystal structure, elemental composition, and absorbance performance were analyzed by XRD, XPS and UV–vis DRS. Due to the formation of the continuous intermediate band gap in the forbidden band, the optical absorption boundary of B-C-N-TiO 2 catalyst extends to 412 nm, which shows different red shift compared with that of TiO 2 (397 nm), N-TiO 2 (400 nm), B-TiO 2 (402 nm) and C-TiO 2 (403 nm).Meanwhile, the B-C-N-TiO 2 catalyst is a uniform spherical solid particle with exposed (101) and (211) planes. The degradation efficiency of B-C-N-TiO 2 catalyst to methylene blue(MB) was up to 97.82% after 3 h under visible light, which shows different degree of improvement compared with that of TiO 2 (34.8%), N-TiO 2 (79.09%), B-TiO 2 (87.82%) and C-TiO 2 (73.19%). B-C-N-TiO 2 has good stability, and there was still more than 95% degradation efficiency after three degradation cycles. It is also revealed that the incorporation of B-C-N element affects the crystal phase of the catalyst and promotes the generation of heterophase surface heterojunction between (101) and (211). It has certain guiding value for co-doping modification of three elements.
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JOURNAL OF POLYMER RESEARCH
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2020
·Vol. 27
·期 5
·1-12
·
IF 2.426
Dai Zhong,Ren Penggang,Cao Qiping,Gao Xin,He Wenwei,Xiao Yizhou,Jin Yanling,Ren Fang
The hydrophobic TiO 2 /lignin based carbon nanofibers (TiO 2 @CFs) composite with high photocatalytic efficiency and excellent cycle performance is successfully prepared by the method of electrospinning and thermo-treatment. The results of FTIR, SEM and EDS analyses show that the TiO 2 nano-particles are uniformly and firmly coated on the surface of CFs. Due to good hydrophobicity and high electrical conductivity of CFs, such unique properties endow TiO 2 @CFs composites with enhanced light energy utilization efficiency and photocatalytic efficiency because of their floatability on the solution, high adsorptive capacity of MB, and low recombination of photo-generated electrons and holes. Compared with the commercial TiO 2 powder, the degradation rate toward MB of TiO 2 @CFs is improved about 2.62 and 3.02 times at 30 and 15 min, respectively, under static state and xenon lamp irradiation. The degradation rate of TiO 2 @CFs toward MB reaches 62.77% within 15 min under static state, and further increase to 87.28% after 30 min. In addition, the removal rate of MB can be obtained up to 91.5% even after four cycles at a stirring speed of 200 RPM. Therefore, these unique material structures make it become a promising photocatalytic material.
The TiO 2 /lignin lased carbon nanofibers composite with excellent photocatalytic performance, reusability and durability was prepared from a green and low-cost biomass materials of lignin by using the simple method of electrospining.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 14
·11276-11285
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IF 2.22
Deng Yuehong,Zhou Yi,Tang Haiqin,Xu Yifeng,Tan Yawen,Zou Hao,Xiang Ye
In this work, Bi spheres were deposited on bulk WO 3 ·0.33H 2 O and TiO 2 (P25) nanoparticles to form Z-scheme Bi/TiO 2 /WO 3 ·0.33H 2 O heterojunction material for the first time by a simple hydrothermal method. The as-prepared materials were comprehensively characterized by XRD, XPS, SEM, TEM, UV–Vis DRS, BET surface area, EIS, and Mott-Schottky analysis. The ternary Bi/TiO 2 /WO 3 ·0.33H 2 O composites exhibited superior degradation efficiency for RhB than pure WO 3 ·0.33H 2 O, TiO 2 (P25), and their binary composites. The degradation rate reached 99.84% after 30 min under simulated sunlight. The enhancement of photocatalytic activity could be attributed to the Z-scheme heterojunction system with metal Bi as an electronic medium, which greatly enhanced the efficiency of charge separation. This report demonstrated that Z-scheme Bi/TiO 2 /WO 3 ·0.33H 2 O heterojunction photocatalytic material has potential application value in dye wastewater treatment.
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Catalysis Science & Technology
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2020
·Vol. 10
·期 12
·3875-3889
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IF 5.721
Shaohua Pang,Yunfei Lu,Lin Cheng,Juming Liu,Huiyan Ma,Jucai Yang,Qiancheng Zhang
To date, various methods have been adopted to enhance the visible-light photocatalytic activity of nano-TiO2. However, a more facile and moderate method is still highly desirable. In this work, a series of defective nano-TiO2 photocatalysts with surface oxygen vacancy defects (SOVDs) coordinated by surface acetate ligands (SALs) were synthesized via a facile low-temperature sol-hydrothermal method without more complicated modifications. The low synthesis temperature not only results in the preservation of SALs derived from the protective agent acetic acid, but also results in a considerable amount of SOVDs due to low crystallinity and small particle size. The SALs are coordinated to nano-TiO2 in both bidentate chelating and bidentate bridging modes. The electron-withdrawing carboxyl groups can induce the splitting of the impurity states introduced by the SOVDs when the SALs and SOVDs coexist on the surface of TiO2. The split impurity states contribute mainly to the formation of valence band (VB) tail states, which can significantly narrow the bandgap of TiO2. Furthermore, the SOVDs and SALs synergistically result in the positive shift of the main VB edge of TiO2, which can significantly enhance the oxidizing capability of the photogenerated holes. Meanwhile, an appropriate amount of SOVDs can effectively promote the separation of photogenerated charge carriers. The synergistic effect of the above factors significantly enhances the photocatalytic activity of the oxygen-deficient nano-TiO2 for phenol degradation.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Lei Dong,Guang Miao,Xiaoling Ren,Neng Liao,Abdul Waqas Anjum,Zhong Li,Jing Xiao
Desulfurization kinetics and regeneration of silica gel-supported TiO2 extrudates were explored for the reactive adsorptive desulfurization (RADS) process in this work. RADS using TiO2/SiO2 extrudates with varied particle sizes was evaluated. The textural and chemical properties of molded adsorbents were well maintained after extrusion, with a negligible decrease (<0.97%) in the desulfurization capacity for 50 ppm low-sulfur diesel. The RADS of trilobed TiO2/SiO2 was well described with a first-order adsorption kinetic model of ln(C) = −9.42 × 10–3t + 3.84, and TiO2/SiO2 extrudates with smaller particle size may provide larger external surface area and shorter diffusion path. The impacts of packing density and weight hour space velocity (WHSV) on fixed-bed dynamic RADS were discussed. The desorption of adsorbed diesel can be well presented by a first-order model, where the total diesel yield of the RADS process reached above 99.5% at a nitrogen purging temperature ≥150 °C. The effects of solvent structure, polarity, and alkalinity on adsorbent regeneration were further illustrated. This work provides an insight into the aspects of kinetics and regeneration of molded adsorbents to pave the way for industrial fixed-bed desulfurization processes.
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Journal of Materials Research and Technology-JMR&T
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2020
·
IF 5.289
Jian Sun,Shaofeng Li,Zhilin Ran,Yingxue Xiang
Fe 3 O 4 @TiO 2 magnetic photocatalytic particles were synthesized and characterized. A composite PVDF separation membrane blended with Fe 3 O 4 @TiO 2 particles was prepared by the phase inversion method. The main purpose was to explore the effect of magnetic fields on the performance of membranes during coagulation bath. The structure characterization, permeability, interception ability, and anti-pollution performance of inorganic particle blend membranes were then tested. Results showed that magnetic field coagulation baths have little effect on the pore structure and hydrophilicity of the membrane surface. When the liquid membranes was condensed under a magnetic field, the magnetic photocatalytic particles could migrate at a greater rate to the surface of the membrane. Through performance tests of the PVDF modified membranes, it was found that a magnetic coagulation bath could promote more Fe 3 O 4 @TiO 2 to aggregate on the surface of the membrane, which led to the blend membrane formed under the magnetic coagulation bath had better antifouling performance against humic acid solution under ultraviolet light irradiation. Membranes with 0.5 wt% magnetic photocatalytic particles in a magnetic field coagulation bath performed best. When filtered under the condition of ultraviolet light, its pure water flux was 1752 L/(m 2 h), and the rejection rate of 20 mg/L humic acid solution was 67.17%. The flux attenuation before and after filtration was 38.84%, the flux recovery rate was 91.10%, and the irreversible pollution index was only 8.90%.
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JOURNAL OF THERMAL SPRAY TECHNOLOGY
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2020
·Vol. 29
·期 5
·1172-1182
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IF 2.522
Zhai Mengjiao,Liu Yi,Huang Jing,Hou Wenjia,Wu Songze,Zhang Botao,Li Hua
Abstract A novel TiO 2 -SrCO 3 co-catalyst with a porous structure was fabricated by suspension plasma spraying. SrTiO 3 as revealed by high-resolution TEM was formed by the chemical reaction of TiO 2 with SrCO 3 during the high-temperature plasma spraying. A narrow band gap (2.58 eV) and reduction in the recombination speed of photoinduced carriers of the coatings were detected by UV–visible diffuse reflectance spectrometry and fluorescence spectrometry, respectively. The enhanced visible light-driven photodegradation properties of the coatings resulted in promoted degradation of methylene blue. The composite coatings also demonstrated significantly pronounced bactericidal activities against the Gram-negative bacterium Escherichia coli than the pure TiO 2 coatings, achieving a killing rate of over 99.7%. The results give insights on the potential to fabricate large-scale nano-TiO 2 -based porous photocatalytic coatings by suspension plasma spraying for versatile environmental applications. Graphic Abstract
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 30
·305704
·
IF 3.551
Hong Li,Weizhe Song,Xingqiang Cui,Yanhui Li,Baorong Hou,Xiaoping Zhang,Yuqi Wang,Lianjun Cheng,Pengfei Zhang,Junru Li
AgInS2 nanoparticle and graphene nanosheet co-sensitized anatase TiO2 nanotube array films were fabricated by a combination of hydrothermal reaction and electrochemical anodization on titanium sheets. The results showed that the co-sensitization of AgInS2 nanoparticles and graphene nanosheets extended the photoresponse of TiO2 nanotubes into the visible-light region, and improved the photogenerated charge separation and transfer capability. The photocurrent density of the AgInS2/graphene/TiO2 composites (about 4.0 mA cm−2) was 20 times that of bare TiO2 (only 0.2 mA cm−2) under visible-light illumination. The potential negative shift value of AgInS2/graphene/TiO2 composites was up to 0.68 V versus saturated calomel electrode. The AgInS2/graphene/TiO2 composites can provide Q235 carbon steel with highly efficient photocathodic protection under visible-light illumination.
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PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Ruimin Hu,Tao Fan,Jinlong Yang,Hang Xiao,Yiping Liu,Ming Lu
Recent years have witnessed the explosive progress of functional nano materials in textile field, requires us to re-recognize and understand the potential hazards of nanoparticles . A harmless, cost-effective and facile approach of growing functional particles with special morphology and immobilizing onto cellulose fabric (CF) to prepare functional fabrics is highly desired. Here, commercial TiO 2 nanoparticles (TiO 2 NPs) grow under ultrasound-microwave and form a flake-like structure, which retain excellent photocatalytic degradation ability and prevented the potential harm to human body when nanoparticles fell off. The method was implemented based on 4-methylmorpholine-N-oxide (NMMO) aqueous system which was approved as a favorable solvent for dissolving cellulose, and grew flake-TiO 2 on cotton fibers under the assistance of the ultrasound and microwave. The as-prepared TiO 2 -CF possessed satisfactory photocatalytic activity for Methylene blue (MB) and Rhodamine B (RhB) dyes under ultraviolet light with the low dye residue rate of about 5% and 1%, respectively. After 50 times rigorous washing procedures, the titania loading next to 18% was confirmed by thermogravimetric analysis , which proved that TiO 2 -CF had good wash fastness.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 3
·1-8
·
IF 6.232
Chen Yan,Yin Huanshun,Sui Chengji,Fu Weizhang,Yang Yue,Ai Shiyun
A photoelectrochemical method was proposed for DNA hydroxymethylation determination using black TiO 2 (B-TiO 2 ) nanosphere as photoactive material and ZnO as photoactivity inhibitor. After hydroxymethylated DNA (5hmC-DNA) was captured on the probe modified B-TiO 2 /ITO electrode surface through hybridization, a glycosyl can be then transferred from uridine diphosphoglucose to 5hmC-DNA and formed a covalent structure with –CH 2 OH in the presence of T4 β-glucosyltransferase (β-GT). Afterwards, based on a series of covalent reaction, amino functionalized ZnO nanoparticles are further immobilized to the surface of the electrode. Due to the capacity to expend the irradiation light and the photogenerated electron of electron donor, the modified ZnO nanoparticles can result in a decreased photocurrent. The developed method shows wide linear ranges from 0.05-200 nM for hydroxymethylated DNA and 1-220 unit·mL −1 for T4-β-glucosyltransferase. The corresponding determination limits were 0.013 nM and 0.24 unit·mL −1 , respectively. The enzyme activity inhibited by 4-phenylimidazole was evaluated. This photoelectrochemical method shows high specificity for 5hmC-DNA (compared to 5fC, 5mC, m6A, control) and β-GT (compared to β-AGT, UGT2B7), and shows excellent stability for testing 5hmC (RSD = 2.75%).
Schematic representation of photoelectrochemical method for DNA hydroxymethylation and β-glucosyltransferase detection based on the glycosylation reaction of –CH 2 OH in 5-hydroxymethylcytosine and the inhibition activity of ZnO to the photoactivity of black TiO 2 nanospheres.
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