ADVANCED POWDER TECHNOLOGY
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2020
·
IF 4.217
Chunquan Li,Ningyuan Zhu,Xiongbo Dong,Xiaoyu Zhang,Ting Chen,Shuilin Zheng,Zhiming Sun
Lamellar kaolinite supported monodispersed TiO 2 was prepared through rational design and 0D/2D structural assembly, which showed significantly improved photocatalytic performance towards ciprofloxacin. After systematic evaluation, the pseudo-first-order kinetic constant rate of TiO 2 /kaolinite composite can reach to 0.04549 min −1 , which was 6.90 and 1.81 times higher than that of pure TiO 2 and P25, respectively. The nano-TiO 2 /kaolinite composite photocatalyst also displayed good reusability performance, only a slight decline occurred after four repeated experiments, which is beneficial for the large-scale application of photocatalysts. Various characterizations indicated that enhanced photocatalytic performance can be ascribed to the synergistic effect between natural kaolinite and the well distributed TiO 2 , which enhanced the light absorption ability, assisted the dispersion of pure TiO 2 , resulted in co-catalysis effect, improved the separation facilitation of photo-induced carriers and promoted the stronger adsorption capacity, etc. These merits effectively regulated the carriers’ lifetime and migration velocity of the photogenerated charge carriers. Considering the excellent properties of natural kaolinite (low cost, abundance, stability, etc.), our study provides a promising candidate for effective degradation of trace amounts of pharmaceutical and personal care product (PPCP) or contaminants with potential high-toxic risk.
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高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2021
·Vol. 27
·期 3
·655-665
·
IF 1.993
Jinyan Hu,Suo Liu,Dingsheng Wu,Dengyu Pan,Quan Feng
As a new advanced oxidation technology, photocatalytic technology has broad application prospects in the field of wastewater treatment. However, in the actual use process, there will be difficulties in catalyst recovery and reuse. This article successfully prepared bacterial cellulose (BC) loaded silver and titanium dioxide nanoparticles (Ag-plated TiO 2 /BC composite pellicle) by in situ embedding method. BC not only works as the carrier to load TiO 2 and Ag NPs but also adsorbs dyes to promote the reaction. As a reusable photocatalytic film, it is convenient to use and recycle in terms of testing and characterization compared with powders. The results show that Ag and TiO 2 nanoparticles were closely embedded in BC. We evaluated the photocatalytic degradation performance of the catalyst on methylene blue (MB), active red X-3B, and Rhodamine B. When the reaction time was 2 h, the dye removal rates were 71%, 68%, and 82.6%. At the same time, through the inhibition zone experiment, it was found that the material has a certain inhibitory effect on both Escherichia coli and Staphylococcus aureus . Therefore, the supported catalyst prepared by this method has the advantages of high catalytic activity, relatively stable property, easy recovery, and tailorability, making it potentially applicable in sewage post-treatment links.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Chengli Yao,Jie Yu,Sijun Yang,Yuhua Shen,Anjian Xie
It is very important to develop efficient noble-metal-free catalysts for oxygen reduction reaction (ORR) to promote the application of commercial fuel cells. Inspired by this idea, ZIF 67 was selected as template to synthesize hierarchical porous TiO 2 /TiN coated Co/N co-doped carbon (Co/NPC) composite after being coated with tetrabutyl titanate (TBOT). The catalytic activity, stability and corrosion resistance of the optimal porous Co/NPC@TiO 2 /TiN composite towards ORR were improved by TiO 2 /TiN shell layer and carbon nanotubes. The results showed that the limit diffusion current (5.32 mA cm −2 , at 0.1 V vs. RHE), onset potential (0.87 V) and half-wave potential (0.754 V) of Co/NPC@TiO 2 /TiN-2 were closed to the corresponding values of 20 wt% Pt/C (5.53 mA cm −2 , 0.93 V and 0.773 V), respectively. The electron transfer number was 3.90–3.95 at a potential of 0.1–1.05 V, indicating a 4e - pathway for ORR and the yield of by-product hydrogen peroxide was below 6%. Additionally, Co/NPC@TiO 2 /TiN-2 also possessed good methanol tolerance and high cycle stability in alkaline media. This work provides a practical method to design ORR catalysts with distinguished performances.
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高影响因子
TEXTILE RESEARCH JOURNAL
·
2021
·
IF 1.82
Wenjun Li,Hui Zhang,Tianyu Chen,Limeng Yang,Cuihong Sheng,Hailiang Wu,Ningtao Mao
The self-cleaning textiles coated with reduced graphene oxide-titanium dioxide (TiO2) nanocomposites have enhanced photocatalytic activities and could have great potential in practical applications. However, it is still problematic regarding how to avoid aggregation of reduced graphene oxide nanosheets in producing reduced graphene oxide-TiO2 nanocomposites. In this research article, we propose a new method to reduce the aggregation of reduced graphene oxide nanosheets in producing cotton fabrics coated with reduced graphene oxide-TiO2 nanocomposites by combining vibration-assisted ball milling and hydrothermal synthesis process. The microstructure and photocatalytic-related properties of the resultant reduced graphene oxide-TiO2 nanocomposites and their coating cotton fabrics were characterized by using a series of techniques including field emission scanning electron microscope (FESEM), atomic force microscope (AFM), X-ray diffraction spectroscopy (XRD), Raman, particle size distribution, Brunauer-Emmett-Teller,(BET), transmission electron microscope (TEM), X-ray photoelectron spectrometer (XPS), diffuse reflectance spectra (DRS), ultraviolet photoelectron spectroscope (UPS), and photoluminescence (PL). It was indicated that the aggregation of reduced graphene oxide nanosheets in reduced graphene oxide-TiO2 nanocomposites was successfully avoided via ball milling in the presence of tetrabutyl titanate. After hydrothermal treatment, the resulting reduced graphene oxide-TiO2 nanocomposites were firmly immobilized on cotton fabric. It was demonstrated in the self-cleaning experiments that the resultant self-cleaning cotton fabrics are hydrophilic and could directly decompose color contaminants such as methylene blue, Congo red, and coffee stains under simulated sunlight irradiation due to the photo-degradation reactions of the reduced graphene oxide-TiO2 nanocomposite coating. The reduced graphene oxide-TiO2 nanocomposite-modified cotton fabric also exhibited excellent performance in both robust abrasion resistance and soap-washing resistance. The fabric photocatalytic self-cleaning capability was not found to decrease significantly after being repeatedly used for five times.
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JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Qi Zhong,Guogui Shi,Qing Sun,Peng Mu,Jian Li
Most super-wetting membrane materials are susceptible to oil pollution after separation process, causing a serious degradation of the separation ability. The rough structure of underwater superoleophobic membrane can effectively improve anti-fouling property, thus achieving stable separation. Herein, a composite polyvinyl alcohol-graphene oxide-titanium dioxide (PVA-GO-TiO 2 , PGT) membrane with rough structure is prepared through a simple hydrothermal and suction-filtration method. The as-prepared PGT membrane displays outstanding underwater superoleophobicity even for high-adhesion crude oil. Moreover, the as-fabricated membrane exhibits efficient oil-in-water emulsions separation performance with separation efficiency of larger than 99.1% and permeation flux of over than 762 L m −2 h −1 even after 10 min. Besides, the PGT membrane could separate various oil-in-water emulsions in corrosive environments with separation efficiency of higher than 99.3% and permeation flux of more than 760 L m −2 h −1 . More importantly, the as-prepared membrane could keep the underwater superoleophobicity after sanding test (200 times) and bending test (500 times). The composite membrane with excellent oil-in-water emulsions separation performance, corrosion resistance and mechanical stability has broad prospects in the field of water purification .
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Surfaces and Interfaces
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2021
·
IF 4.837
Xiaowei Shi,Chao Dai,Xin Wang,Ping Yang,Lingxia Zheng,Zhefei Zhao,Huajun Zheng
Constructing hetero-junction on TiO 2 is an effective way to overcome the fast charge recombination and slow charge transfer kinetics, but how to design the junction is still a significant challenge in photo-electrochemical (PEC) water splitting. In this study, a considerable improvement in PEC performance for TiO 2 nanotubes was achieved following the introduction of a ternary hetero-junction through depositing ZnIn 2 S 4 (ZIS) and Zn 0.6 Ca 0.4 In 2 S 4 (ZCIS) in sequence via a facile hydrothermal method (TiO 2 /ZIS/ZCIS). The optimized photo-anode exhibited a photocurrent density of 1.07 mA cm −2 at 1.23 V vs. reversible hydrogen electrode (RHE), to be 3.96 and 1.25 times enhanced compared to that of TiO 2 and TiO 2 /ZIS, respectively. Meanwhile, the incident photon-to-current conversion efficiency (IPCE) and applied bias photon-to-current efficiency (ABPE) of TiO 2 /ZIS/ZCIS were also increased in contrast with its counterparts. The merits of appropriate band alignment of TiO 2 , ZIS, and ZCIS and fewer interface defects built an internal electric field among the ternary hetero-junction, leading to an enhanced conductivity and efficient interface charge separation. These results were supported by a series of photo-electrochemical measurements. Among others, the shortened average lifetime of photo-generated electron-hole pairs from 1.51 (TiO 2 ) to 1.17 ns (TiO 2 /ZIS/ZCIS) according to time-resolved photoluminescence reveals that the charge carriers generated in TiO 2 would have an additional decay pathway in the hetero-structure, which benefits for the charge separation. Our strategy could be extended to many low-efficiency semiconductors for the design and synthesis of effective photo-anodes in PEC water splitting.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
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IF 4.291
Xing Shang,Qinghua Weng,Fei Wang,Jiaye Wang,Siqi Huang,Shuyu Chen,Zhizhong Han,Jinghua Chen
TiO 2 nanosheets (TiO 2 NSs) with a high percentage of {0 0 1} facets show high photoelectrochemical activity, but they only can utilize ultraviolet light due to the wide band gap. Thus, a new Schiff base monocrystal were synthesized and used to sensitize TiO 2 NSs. And then we constructed photoelectrochemical (PEC) sensors based on Schiff base sensitized TiO 2 NSs for dopamine (DA) detection. The sensitized TiO 2 NSs can extend the absorption spectrum range to the visible light region, and the photocurrent of the PEC sensors was increased by one order of magnitude. Chitosan further decorated the sensors to enhance the selectivity. DA was oxidized by hole and covalently linked with chitosan. Subsequently, the DA oxide acted as electron acceptor to cause photocurrent quenching, enabling quantitative and selective detection of DA. The PEC sensors have wide detection range from 0.0005 to 5.0 mM with the detection limit (LOD) of 0.206 μM (S/N = 3). The non-enzymatic PEC sensors have a good selectivity which can distinguish DA from ascorbic acid (AA) and uric acid (UA), and also have reliable stability and recovery, thus, it has a good application prospect in biomedicine.
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高影响因子
IONICS
·
2021
·Vol. 28
·期 1
·85-97
·
IF 2.817
Wang Xin,Hua Haiming,Li Jiyang,Shen Xiu,Xie Xiaohua,Zhang Peng,Zhao Jinbao
Polyethylene oxide (PEO) was one of the most classic and widely used solid polymer electrolyte matrixes. In this work, we added the previously synthesized titanium dioxide (B-P25) fillers with oxygen vacancies to the PEO-LiClO 4 solid electrolyte system. It is found that compared with the pristine P25 fillers, the oxygen vacancies lead to the decrease of ionic conductivity and the Li + transference number. Infrared and Raman spectroscopy shows that the introduction of oxygen vacancies lead to the formation of Li + -ClO 4 − ion pairs and the decrease of carrier concentration resulted in the decrease of Li + conductivity. Further theoretical calculations verified that this is due to the preferential combination of oxygen vacancies and ether oxygen atoms of PEO. This finding effectively supplements the effect of oxide oxygen vacancies on the conduction of Li + in the PEO matrix, and not all oxygen vacancies are beneficial to the conduction of Li + ions in the PEO matrix.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Xiuting Li,Hongmei Liu,Chenjie Gu,Jinjie Zhang,Tao Jiang
The acquisition of a robust plasmonic substrate with both appreciable molecule anchoring and quantitative detection features is a prerequisite for the reliable adhibition of surface-enhanced Raman scattering (SERS) technology. Herein, an innovative sophisticated SERS substrate was proposed by spin-coating titanium dioxide (TiO 2 ) onto a flexible polydimethylsiloxane (PDMS) film followed by the modification of triangular silver (Ag) nanoplates through in-situ reduction. The absence of organic surfactants during this process rendered the substrate great opportunity in effectively enriching molecules and the assembly of TiO 2 and Ag made it a reusable and sensitive SERS platform. After a recyclable monitoring of 4-aminothiophenol (4-ATP) with different concentrations was carried out by reusing the hybrid substrate for 8 cycles, a limit of detection as low as 1.58 × 10 −9 M was achieved. The distinctive intrinsic Raman signal from PDMS matrix was further verified to successfully correct the poor detection linearity by serving as internal standard and the coefficient of linear correlation (R 2 ) was improved from 0.967 to 0.997. In this regard, the as-prepared multifunctional PDMS/TiO 2 /Ag hybrid substrate with simulation-estimated electromagnetic “hot spots” exhibited remarkable quantitative recyclable detection performance.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Thabang Mokoba,Junfeng Lu,Tian C. Zhang,Like Ouyang,Shaojun Yuan
Frequent occurrences of accidental oil spills, chemical leakages and oily water discharge make the development of effective and efficient methods for spilled oil and organic pollutants clean-ups extremely critical and urgent. Here, a novel superhydrophobic octadecanethiol-TiO 2 nanowires-polydopamine nanocomposites-modified polyurethane sponge was fabricated by a facile and cost-effective synthesis process, wherein, self-polymerization of dopamine was coated on the polyurethane skeleton structure, followed by direct incorporation of TiO 2 nanowires to enhance surface roughness and lastly, surface coating with the low surface energy octadecanethiol molecules. The resultant PU-PDA-TiO 2 -ODT sponge showed superhydrophobic and superoleophilic with the water contact angle (WCA) of 154.0 ± 2° and the oil contact angle of 0°, as well as self-cleaning and anti-fouling capabilities. The as-fabricated sponge demonstrated high oil adsorption capacity for a broad variety of oils and organic solvents , also exhibiting good reusability of more than 30 cycles without diminishing adsorption performance. The potential for practical applications was demonstrated through gravity-driven and vacuum assisted continuous separations, yielding more than 99.9% oil purity. Moreover, the as-prepared sponge exhibited superior mechanical strength through exceptional performance in compression, ultrasonication and frictions tests, and consistent superhydrophobicity in harsh environments including exposure to pH, temperature and NaCl concentration variations. Thus, the novel superhydrophobic and superoleophilic sponge has great potential for practical application in oil-water separations.
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ENERGY & FUELS
·
2021
·
IF 3.605
Yunfei Yan,Chenghua Zhang,Tao Jia,Haojie Li,Kaiming Shen
Aimed at achieving high efficiency of photocatalytic hydrogen production from ammonia borane (NH3BH3, AB), a reduced graphene oxide (rGO)-modified TiO2 photocatalyst was proposed for hydrogen production. In this study, rGO/TiO2 photocatalysts with different rGO contents were prepared and characterized by XRD, UV–vis DRS, FTIR, Raman, and SEM. The experimental results showed that addition of rGO can reduce the band gap energy of TiO2, and the band gap energy of rGO/TiO2 varies with the content of rGO, and 1% rGO/TiO2 has the lowest band gap energy of 2.96 eV. This indicates that the modification of TiO2 by rGO not only increases the probability of electron transition but also promotes the separation of photoelectron and hole pairs due to the good conductivity of rGO so as to improve the quantum efficiency of photocatalysis. In addition, compared with pure TiO2, rGO/TiO2 shows a certain photocatalytic activity under the condition of light irradiation. Among the rGO/TiO2 photocatalysts with different contents of rGO, 1% rGO/TiO2 shows the best photocatalytic performance of ammonia borane hydrolysis, and the value of turnover frequency is 1088.93 μmol·min–1·g–1. Furthermore, the catalyst 1% rGO/TiO2 shows perfect reusability, and its catalytic activity did not decrease significantly even after five reaction cycles.
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ChemSusChem
·
2019
·Vol. 12
·期 21
·4824-4831
·
IF 7.804
Qixin Zhuang,Guofeng You,Lijun Wang,Xinyu Lin,Ding Zou,Hongyu Zhen,Qidan Ling
Graphical Cheap plastic in solar cells ! TiO 2 nanoparticles-based perovskite solar cells (PVSCs) with a polystyrene (PS) interface modification layer and a poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) hole-transporting layer exhibit encouraging photovoltaic performances and stabilities. The use of a cheap plastic material in PVSCs would allow the fabrication of low-cost PVSCs for commercial use Interface engineering of TiO 2 nanoparticles (NPs)-based perovskite solar cells (PVSCs) is often necessary to facilitate the extraction and transport of charge carriers. In this work, poly[{9,9-bis[3′-( N , N -dimethyl)propyl]-2,7-fluorene}- alt -2,7-(9,9-dioctylfluorene)] (PFN) and polystyrene (PS) are demonstrated to be effective surface modifiers of the TiO 2 NPs electron-transporting layer in n-i-p PVSCs. The low-cost insulating polymer PS performs better than the PFN conjugated polymer owing to its high film quality, low surface energy and insulating characteristics. A peak power conversion efficiency (PCE) of 15.09 % with an open-circuit voltage ( V OC ) of 1.05 V and a PCE of 17.13 % with an ultrahigh V OC of 1.18 V is achieved with TiO 2 NPs/PS-based PVSCs using poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and spiro-OMeTAD, respectively, as the hole-transporting material.
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高影响因子
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