CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Lu Jing,Weili Li,Chang Gao,Menglu Li,Weidong Fei
Polymer-based dielectric capacitors are well recognized for high energy density and efficiency. However, the energy density is restricted by the deterioration of breakdown strength with excessive addition of inorganic fillers. Herein, an innovative design of the lamellar-structured BiFeO 3 @TiO 2 (BFO@TO) fillers is proposed and a small amount of BFO@TO is added into P(VDF-HFP)/PMMA blended polymer to fabricate BFO@TO-P(VDF-HFP)/PMMA composites, which delivers an outstanding energy density of 19.3 J cm −3 at 549.2 kV mm −1 . The filler possesses a BFO/TO/BFO triple-layered structure. Due to the different Fermi level, electrons are injected from TO into BFO to form electron accumulation layer and construct the heterojunction electric fields between TO and BFO layers. Heterojunction electric fields at two interfaces produced by the triple-layered structure are opposite. The opposite double heterojunction can withstand larger external electric field and improve the breakdown strength. Besides, BFO, as a narrow bandgap semiconductor, is easier for electrons and holes to separate, which further widens the width of the built-in electric field and reduces the dielectric breakdown. Electric field distribution simulations intuitively confirm the enhancement of the breakdown strength. The results provide an effective strategy to address the critical issue of improving the breakdown strength for high energy storage capability.
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Analytical Methods
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2022
·Vol. 14
·期 33
·3153-3159
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IF 3.532
Ling Mei,Tiantian Si,Shuai Wang,Jie Zhu,Hao Tang,Xiaojing Liang
The TiO2@MOF-919(Fe–Cu) solid-phase extraction material was prepared by growing MOF-919(Fe–Cu) in situ on three-dimensional radial TiO2 microspheres by a simple solvothermal method. This combination drew on both the resources of good single dispersion and extraction rate, which made it a better extraction material. It was accompanied with high-performance liquid chromatography (SPE–HPLC) for the separation and determination of four benzoylurea pesticides (triflumuron, chlorbenzuron, teflubenzuron and diflubenzuron) in afforestation irrigation water and juice samples (grape, peach and apple juices). Under the optimal conditions, the linearity of the method ranged from 1 to 400 μg L−1 with a correlation coefficient (R2) ≥ 0.9994, while the detection limit was in the range of 0.40–0.56 μg L−1 for the four pesticides. The adopted material showed good reusability and can be used no less than 10 times. The intra-day and inter-day precision were in the range of 1.78–3.24% and 4.06–5.08%, respectively. The proposed method was then successfully applied for the detection of benzoylurea pesticides in the spiked samples with good recoveries (72.3–108.4%) and good precision (5.15%) due to π–π and hydrophobic interactions between the analytes and adsorbent. The results show that the composite had the potential to be used as a SPE adsorbent for the enrichment and extraction of benzene ring structures containing imide groups in actual samples.
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APPLIED SURFACE SCIENCE
·
2022
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IF 7.392
Hui Li,Juan Lai,Min Yao,Yingmeng Leng,Zhengde Wu,Jian Zhang,Hailong Peng,Zumin Qiu
A new method was applied to modify TiO 2 nanoparticles. Epoxy resin (EP) and M-TiO 2 nanoparticles were used to prepare a novel superhydrophobic composite coating (M-TiO 2 @EP) by a one-step spraying method. The M-TiO 2 @EP coating surface has rough surface with hierarchical micro-/nanostructures. The M-TiO 2 @EP coating showed excellent superhydrophobicity capability with a high water contact angle (156°) and low sliding angle (6°). The M-TiO 2 @EP coating exhibited outstanding mechanical durability owing to multilayer structure of M-TiO 2 and the adhesion enhancement of EP, and the coating still retained superhydrophobicity after long-distance (10 m) mechanical wear under the weight of 200 g. Meanwhile, the M-TiO 2 @EP coating can capture stable air film to prevent the permeation of H + , Cl − , and OH − from water and simultaneously absorb more UV irradiation. Additionally, the M-TiO 2 @EP coating superhydrophobicity was also proven for various droplets and excellent self-cleaning performance. Meanwhile, the M-TiO 2 @EP coating also showed outstanding resistance to both extreme temperatures, UV resistance, corrosion resistance, and anti-icing ability. Therefore, the novel M-TiO 2 @EP coating with these excellent properties could yield a prospective candidate for promising outdoor and harsh condition applications.
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CHEMOSPHERE
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2022
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IF 8.943
Zengxing Li,Kim Hoong Ng,Shen Xu,Yingzhen Zhang,Yonggang Lei,Jianying Huang,Yuekun Lai
The realization of solar-driven photoelectrochemical (PEC) process lies in the success development of materials with excellent photoelectric properties. Past reports identified TiO 2 , upon modified with both Cd and ZnIn 2 S 4 (ZIS), exhibits promising PEC performance; however, at the cost of tedious preparation. In view of this, our work proposes a facile one-step hydrothermal strategy to deposit both modifiers onto the pre-obtained TiO 2 nanotubes (NTs), realizing rose-like TiO 2 /ZnIn 2 S 4 (TiO 2 /ZIS) or tremella-like TiO 2 /Cd:ZnIn 2 S 4 (TiO 2 /Cd:ZIS) with improved PEC performances. Interestingly, the thickness of ZIS petals, which deposited on top of TiO 2 NTs, is positively-correlated to its Cd-composition, signifying the substitutional doping of Cd into the unit cell of ZIS. This renders robust ionic interactions between the constituents, prompting the enhanced optical properties of TiO 2 in conjecture to its reduced impedance. As a result, the recombination rate of photo-electric-derived carriers was drastically suppressed, with an improved photocurrent density of 606.2 μA cm −2 recorded by TiO 2 /Cd:ZIS photoanode under solar irradiation. Such performance is 80 times and 5.16 times higher than those of bare TiO 2 NTs and TiO 2 /ZIS counterparts. The photoconversion efficiencies in terms of incident photon-to-current conversion efficiency (IPCE) and applied bias photon current efficiency (ABPE) for TiO 2 /Cd:ZIS were significantly improved too, recorded at 1.12% and 0.38%, respectively, under standard evaluation condition. As summary, our work proposes a facile one-step hydrothermal approach that simultaneously-deposit both Cd and ZIS onto TiO 2 photoanode for an enhanced PEC performance. This opens up a wider horizon for PEC technology , further unlocking its potential in both energy and environmental applications.
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Journal of Cleaner Production
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2022
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IF 11.072
Yujie Tan,Luying Sun,Guicheng Wang,Ruina Zhang,Jianyuan Hou,Renxi Zhang,Weixuan Zhao
A novel efficient catalyst called Ag/N-doped TiO 2 /CNTs was fabricated using a two-step method involving treatment with ammonia plasma followed by a process of hydrogen plasma reduction at a low temperature. The photocatalyst , which was composed of silver nanoparticles (AgNPs), titanium dioxide (TiO 2 ) and 5% amount of carbon nanotubes (CNTs), achieved an adequate formaldehyde elimination rate of 95% under visible-light irradiation. A series of analytical methods was employed to investigate the advantages of the novel fabrication method . The results showed that the first step, which is the N doping of TiO 2 could be particularly important for improving the photocatalytic performance because of the reduced band gap and newly formed Ti 3+ . Furthermore, it could assist in the anchor of AgNPs during the second step of fabrication. During the second step of hydrogen reduction process, AgNPs of smaller sizes were more homogeneously anchored on the surface of N-doped TiO 2 /CNTs than that of the catalysts without ammonia plasma treatment . The resulting higher level of AgNPs could aid in efficient electron transfer and significantly improve the response to visible light, considering the surface plasmon resonance effect. CNTs and AgNPs played significant roles as electron acceptors in reducing the recombination rate of photogenerated hole pairs, and moreover, this two-step plasma process could be beneficial for achieving surface and interface properties suitable for formaldehyde photodegradation . This novel approach for fabricating an efficient Ag/N-doped TiO 2 /CNTs has potential for application in environmental purification systems.
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 36
·17505-17516
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IF 3.925
Kuang Wang,Jialong Tian,Wenhui Yu,Ling Lin,Zhenming Qi,Chunxia Wang
A novel and efficient approach is presented herein to develop self-cleaning and ultraviolet resistant cotton fabrics loaded with a self-dispersed and reactive TiO2/BiOBr photocatalyst. TiO2/BiOBr was synthesized by a facile hydrothermal method and characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS) and photocatalytic activity. Amino-functionalized TiO2/BiOBr was prepared through the reaction of 3-aminopropyltriethoxysilane with TiO2/BiOBr and then reacted with sodium 2-(4-(4,6-dichloro-1,3,5-triazine-2-ylamino)phenylsulfonyl)ethyl sulfate (SDTES) to obtain self-dispersed and reactive TiO2/BiOBr. The chemical structure and dispersity of TiO2/BiOBr, amino-functionalized TiO2/BiOBr and self-dispersed and reactive TiO2/BiOBr were revealed utilizing Fourier transform infrared spectroscopy (FTIR) and a zeta potential test. Cotton fabric was loaded with self-dispersed and reactive TiO2/BiOBr by the dip dyeing method. XRD and SEM were employed to characterize the crystalline structure and surface morphology of cotton fabrics, respectively. In addition, the anti-ultraviolet, self-cleaning and wash fastness properties of cotton fabrics were studied. The photocatalytic test demonstrated that TiO2/BiOBr has superior photocatalytic activity than TiO2 or BiOBr under simulated sunlight irradiation. In addition, the experimental results showed that self-dispersed and reactive TiO2/BiOBr had commendable dispersity and storage stability. The cotton fabric loaded with self-dispersed and reactive TiO2/BiOBr had exceptional anti-ultraviolet, self-cleaning and washing properties. The photocatalytic mechanism of self-dispersed and reactive TiO2/BiOBr and its binding reactions with cotton fabric were proposed, which may provide a reference for broad application potential in functional textiles.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 23
·18345-18355
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IF 2.779
Gao Liang,Zhang Jiaqi,Song Lingyun,Bai Xilong,Yu Changxing
Polymer film capacitors have a high power density and great application potential in high-power electronic devices; however, high-energy storage density of polymer composites is usually obtained via doping high-content ceramic filler. An efficient approach to solve this issue is to dope polymers with an ultralow-content ceramic filler to improve their energy storage density. In this work, one-dimensional (1D) TiO 2 nanobelts@SiO 2 (TO nb@SO) are prepared via the hydrothermal reaction, muffle calcination, and hydrolysis. Extremely low-content TO nb@SO/poly(vinylidene fluoride) (TO nb@SO/PVDF) composites are prepared. The microstructure, crystalline structure, dielectric properties, electric breakdown strength, and discharge energy density are systematically investigated. The results show that the nanobelts have a width of 250 nm, a length of 1–2 μm, and a uniform shell layer at the edge with a thickness of ∼25 nm. The relative dielectric constant of the composites is significantly enhanced; it reaches 11 for PVDF at 100 Hz, and 12.03 for 0.5 wt% TO nb@SO/PVDF. The theoretical dielectric constant is calculated based on a mathematical model and compared with the measured value. 1D materials with a large aspect ratio are beneficial in the improvement of the dielectric properties. The Weibull breakdown field strength is 381.3 MV/m for 0.5 wt% TO nb@SO/PVDF. A discharge energy density of 8.86 J/cm 3 is obtained at 390 MV/m, while a high charge/discharge efficiency of 66.28% is achieved. To conclude, this work provides a valuable method for increasing the energy storage density and charge/discharge efficiency of dielectric capacitors.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Qiao Li,Yang Huang,Zhong Pan,Jiancong Ni,Weiqiang Yang,Jianhua Chen,Ying Zhang,Jianmin Li
Novel hollow C, N-TiO 2 @C surface molecularly imprinted microspheres (HCNTC-SMIPs) with hydrophilicity, reusability, and selectivity were synthesized. The core–shell hollow structure yields large specific surface areas, high surface-to-volume ratios and effective diffusion rate on both inner and outer exposed surfaces. The C, N-TiO 2 shell possesses high photo-catalytic decomposition capacity toward the specific pollutants. Moreover, TiO 2 acts not only as a photocatalyst but also as a double cross-linker agent of molecularly imprinted to significantly reduce the molar ratio of formaldehyde. The hydrophilic surface imprinted layer provides the recognition sites and specific pore structures. The results showed that HCNTC-SMIPs possessed a high specific surface area of 305.10 m 2 g −1 and a good visible light harvesting property with a bandgap of 1.67 eV. This could efficiently suppress the photoelectron-hole recombination, and thereby heightening the photocatalytic degradation of sulfadiazine (SDZ). The photodegradation efficiency of HCNTC-SMIPs can reach 99.25 % within 140 min and 90.00 % after 6 cycles. The HCNTC-SMIPs had a higher kinetic constant (0.01815 min −1 ) than those of HCNTC (0.00964 min −1 ) and TiO 2 (0.00548 min −1 ). HCNTC-SMIPs can achieve targeted and efficient SDZ removal, as well as in-situ regeneration. The possible degradation pathways of SDZ primarily includes smiles-type rearrangement, SO 2 extrusion, ring hydroxylation, direct oxidation and S N bond cleavage processes based on LC-MS analysis.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Jiayao Yang,Jinfeng Dai,Xiaohuan Liu,Shenyuan Fu,Enmin Zong,Pingan Song
Lignin, as a natural polymer material, has the advantages of green safety, renewable, and pollution-free. It has a wide application prospect in the field of thermosetting. However, it has been attractive but a huge challenge to design high performance and high added-value lignin-based epoxy resin. Herein, lignin-based epoxy (LEP) was synthesized from moso bamboo-derived lignin, and then lignin-based epoxy/titanium dioxide (LEP/TiO 2 ) hybrid nanoparticle was synthesized via liquid deposition method for modifying lignin-based epoxy resin to prepare multifunctional bio-based epoxy. The results show that the LEP/TiO 2 hybrid nanoparticle exhibits a stable topological surface shape and good dispersion and uniformity. By adding 10 wt% LEP/TiO 2 hybrid nanoparticles, the multifunctional bio-based epoxy exhibits good mechanical strength and toughness, and the tensile strength and fracture toughness reach 36 MPa and 1.26 MPa·m 1/2 , respectively. In addition, the thermal stability , UV absorption and antibacterial properties of the multifunctional bio-based epoxy are further improved. This study provides a facile and efficient method for the preparation of high-performance multifunctional bio-based epoxy composite and a novel solution for the utilization of lignin.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Zihan Tian,Shixiao Wang,Yilin Wu,Feng Yan,Shuhao Qin,Jingkui Yang,Jianxin Li,Zhenyu Cui
PVDF@TiO 2 NPs hybrid membranes with different hybrid modes were fabricated. The chemical structure , surface characteristic features and optical properties of the hybrid membranes were characterised. The effects of different hybrid modes on photocatalytic performance are discussed for the first time. The results indicated that the membrane with both chemical bonding and coordination between TiO 2 NPs and polymer matrix showed the best photocatalytic performance. Furthermore, the aggregation tendency of TiO 2 NPs on the hybrid membrane surface was effectively suppressed and the band gap of TiO 2 NPs was significantly reduced. The photogenerated electron-hole recombination rate was significantly decreased by the strongly electronegative fluorine (F), carboxyl and ester groups. Additionally, the negatively charged carboxyl groups on the surface of hybrid membrane facilitated the adsorption of methylene blue (MB) dye and promoted the adsorption-photocatalytic degradation of the MB. The photocatalytic degradation efficiency ( η ) of MB was higher than 95.4% and the η remained greater than 90% after 5 recycling cycles. Compared with membranes prepared by dip coating or blending, the grafted membrane exhibited higher degradation efficiency and improved recyclability. Therefore, this membrane provided a simple method for preparing stable hybrid membranes with better photocatalytic performance.
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ACS Omega
·
2022
·
IF 4.132
Ji Shi,Wenyu Huang,Hongxiang Zhu,Jianhua Xiong,Huiting Bei,Shuangfei Wang
Widespread application of TiO2 for degradation of antibiotics is restricted by mainly the low photodegradation efficiency under solar irradiation. To expand the application of TiO2, the key factors that should be improved are visible-light response, yield of electrons and holes, and durability. Herein, we report a visible-light responsive and durable sugarcane-bagasse-derived biochar supported hydrogenated TiO2 (HSCB/H2-TiO2) photocatalyst with higher electron production fabricated by a facile one-pot hydrogenation. Mild hydrogenation temperature preserved the lotus-stem-like structure of sugarcane bagasse and gave the photocatalyst great separability. The superior durability of HSCB/H2-TiO2 was demonstrated by 12 rounds of repeated degradation of methylene blue (MB). In addition, the electron paramagnetic resonance (EPR) results demonstrated that the biochar skeleton contains abundant persistent free radicals (PFRs), which can provide excess electrons to form more •O2–. Meanwhile, radical quenching experiment and EPR radical trapping results also revealed that •O2– was the most dominant species for enrofloxacin (ENR) degradation. Thus, the as-fabricated photocatalyst shows excellent solar-driven degradation of ENR, and 95.6% of ENR was degraded in 180 min under simulated solar irradiation. Possible ENR degradation pathways and mechanism are also proposed based on the identified intermediates.
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FUEL PROCESSING TECHNOLOGY
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2022
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IF 8.129
Dewang Zeng,Chen Wang,Tong Liu,Wentao Ou,Rui Xiao
Chemical looping methane oxidative coupling is a promising method to directly convert methane to C 2 products but is limited by the trade-off between CH 4 conversion and C 2 selectivity. Here, we develop a series of TiO 2 doped Na 2 WO 4 /Mn 2 O 3 /SiO 2 for chemical looping methane oxidative coupling and investigate the underline mechanism for the enhanced performance. The results show that 5 wt% TiO 2 doped Na 2 WO 4 /Mn 2 O 3 /SiO 2 exhibited 31.2% CH 4 conversion, which is 1.68 times as large as that of Na 2 WO 4 /Mn 2 O 3 /SiO 2 , without significantly decreasing C 2 selectivity (~70.3%). Pulse experiments show that TiO 2 improves the bulk oxygen diffusion, providing more surface oxygen to convert methane, thus leading to enhanced CH 4 conversion. O 1 s spectra manifests that the active oxygen content on the surface was not significantly increased by TiO 2 dopant , thus TiO 2 dopant has little effect on C 2 selectivity. Therefore, 5 wt% TiO 2 doped Na 2 WO 4 /Mn 2 O 3 /SiO 2 shows high chemical looping methane oxidative coupling performance. The explored mechanism in this work can be extended to design more oxygen carriers to enhance the chemical looping reactions.
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