Journal of Water Process Engineering
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2020
·
IF 3.465
Nan Wang,Xing Li,Yanling Yang,Zhiwei Zhou,Yi Shang,Xiaoxuan Zhuang,Tingting Zhang
In a previous study, we used a sol-hydrothermal method with a one-stage calcination in an air atmosphere at 400 °C to prepare composites of Bi 2 O 3 -TiO 2 supported on powdered activated carbon (Bi-Ti/PAC-1). However, the photocatalytic efficiency of those composites was relatively low due to their high band gap and the single crystal phase of their TiO 2 . To improve the photocatalytic efficiency, we developed a two-stage calcination method with a first calcination in air at 300 °C followed by a second calcination in a N 2 atmosphere (at 500, 600, or 700 °C) to form the Bi 2 O 3 -TiO 2 composites (Bi-Ti/PAC-2). Compared with Bi-Ti/PAC-1, the photocatalytic degradation efficiency of sulfamethazine (SMT) by Bi-Ti/PAC-2-700 increased by 32 % under solar light irradiation. Bi-Ti/PAC-2-700 contained two TiO 2 crystal phases, rutile and anatase, and its band gap was 2.58 eV, far less than that of Bi-Ti/PAC-1. Electron paramagnetic resonance measurements and trapping experiments showed that the superoxide radical, hole, and hydroxyl radical each played an important role in the degradation of SMT, among which the superoxide radical predominated. The degradation pathway of SMT included four processes: oxidation of hydroxyl radical, SO 2 extrusion, N C and S N bond cleavage. We also determined that solution pH, humic acid, and inorganic ions had varying effects on the photocatalytic degradation capability of Bi-Ti/PAC-2-700. We measured the efficiency of Bi-Ti/PAC-2-700 for SMT degradation in natural river and lake water and found it to be >85 %, sufficient for practical applications. This study provides a green and efficient photocatalyst that can be applied to water treatment processes.
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高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 4
·631
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IF 4.324
Zhen Li,Libo Yu,Hao Wang,Huiwen Yang,Huan Ma
Light harvesting and electron recombination are essential factors that influence photovoltaic performance of quantum dots sensitized solar cells (QDSSCs). ZnO hollow microspheres (HMS) as architectures in QDSSCs are beneficial in improving light scattering, facilitating the enhancement of light harvesting efficiency. However, this advantage is greatly weakened by defects located at the surface of ZnO HMS. Therefore, we prepared a composite hollow microsphere structure consisting of ZnO HMS coated by TiO2layer that is obtained by immersing ZnO HMS architectures in TiCl4aqueous solution. This TiO2-passivated ZnO HMS architecture is designed to yield good light harvesting, reduced charge recombination, and longer electron lifetime. As a result, the power conversion efficiency (PCE) of QDSSC reaches to 3.16% with an optimal thickness of TiO2passivation layer, which is much higher when compared to 1.54% for QDSSC based on bare ZnO HMS.Keywords:TiO2passivation layer;ZnO hollow microspheres;quantum dots sensitized solar cells
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2020
·
IF 3.871
Xiaohan Ma,Qinghua Chen,Guocheng Liu,Yuanming Zhou,Dong Ma,Shuaishuai Xin,Chengze Yu,Bin Zhang,Yanjun Xin
Netlike 3D Z-scheme graphitic carbon nitride (g-C 3 N 4 ) nanosheets decorated TiO 2 nanobelt-tubes (TNBTs) photoelectrodes (g-C 3 N 4 /TNBTs) were fabricated via anodization and coating technology. The network 3D photoelectrodes were characterized by HR-TEM, XPS and UV–Vis/DRS. The photoelectrochemical properties were examined to reveal the transfer and separation efficiency of photogenerated electrons. The photocatalytic activity was investigated by the photocatalytic decomposition of tetracycline hydrochloride (TC) under light irradiation. Results showed that g-C 3 N 4 with rugged surface were loaded on TNBTs by chemical bond joint to form heterostructure. The g-C 3 N 4 /TNBTs exhibited stronger visible light absorption and reduced recombination of photogenerated electron-hole pairs than TNBTs. The photocurrent response of g-C 3 N 4 /TNBTs was ~1.88-fold that of TNBTs. The photocatalytic rate of g-C 3 N 4 /TNBTs for TC was significantly higher than that of TNBTs (0.017 min −1 vs 0.007 min −1 ). The O 2 − and h + were the dominant oxidation species during the degradation of TC. The possible photocatalytic mechanism of constructing Z-scheme heterojunction was also proposed.
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ENVIRONMENTAL RESEARCH
·
2020
·
IF 5.715
Fei Sun,Hai-Tao Ren,Ting-Ting Li,Shih-Yu Huang,Yue Zhang,Ching-Wen Lou,Jia-Horng Lin
Inspired by fish scales, this study prepares a thermo-responsive underwater oleophobic PNIPAM/PAN/TiO 2 nanofibrous membranes by traditional electrospinning technique using poly-N-isopropylacrylamide (PNIPAM) and polyacrylonitrile (PAN). Thermal properties, mechanical properties, surface chemical composition, wettability , photocatalysis , and oil/water separation of PNIPAM/PAN/TiO 2 membrane are explored compared to pure PNIPAM membrane. Result reveals that PAN/TiO 2 compounds make PNIPAM membrane with a smaller fiber diameter of 141 nm and high tensile stress of 7.4 MPa, and also decompose 98% of rhodamine B after UV light radiation . This bioinspired design structure endows the membrane with superhydrophilicity with a low water contact angle, and underwater superoleophobicity with a high oil contact angle of 157° (petroleum ether) and 151° (dichloromethane). This membrane can efficiency separate oil/water mixture with a high separation efficiency. Moreover, the resultant PNIPAM/PAN/TiO 2 membrane has the bionic fish scale structure, and has wettability respond at lower critical solution temperature making the water flux decreased from 10013 ± 367 L m −2 ·h −1 to 7713 ± 324 L m −2 ·h −1 , and thus has a potential to be used in purification of reclaimed water and separation of oil from water.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Ling Wang,Koucheng Chen,Hui Tong,Ke Wang,Lu Tao,Yinxi Zhang,Xingfu Zhou
In this study, a Yb 3+ , Er 3+ co-doped TiO 2 inverted pyramid nanorod (NR) array and a compact TiO 2 film are simultaneously fabricated as the mesoporous support layer and electron-blocking layer, respectively, by a one-pot hydrothermal method . The scanning electron microscopy results show that the incorporation of Er 3+ and Yb 3+ causes changes not only in the growth rate of the NRs, but also in the TiO 2 NR morphology. The Er 3+ , Yb 3+ co-doped TiO 2 NRs exhibit an inverted pyramidal morphology, which is beneficial for perovskite permeation and light utilization. Notably, the Er 3+ , Yb 3+ co-doping causes changes in the band gap of TiO 2 and leads to 25% increase in the current density. The electrochemical impedance spectroscopy results show that the device based on the doped TiO 2 NRs has a higher recombination resistance and a lower transfer resistance than those of the undoped device, and thereby, the doped device exhibits a lower electron recombination rate. In addition, the upconversion Er and Yb co-doped device exhibits 25% higher current density and 17% higher photon-to-electron conversion efficiency, as revealed by the J-V test results. Moreover, the optimized efficiency of the TiO 2 NR array-based perovskite solar cell is determined to be 10.02%. Furthermore, the Er and Yb co-doped device exhibits a near-infrared response, an efficiency of 0.1% is achieved under infrared light (800–1100 nm) irradiation. This upconversion material can widen the photovoltaic responses of solar cells into the near-infrared region and improve the utilization of sunlight.
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Nano Research
·
2020
·Vol. 13
·期 4
·983-988
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IF 8.183
Liu Lifei,Zhang Jianling,Tan Xiuniang,Zhang Bingxing,Shi Jinbiao,Cheng Xiuyan,Tan Dongxing,Han Buxing,Zheng Lirong,Zhang Fanyu
To construct the heterojunctions of TiO 2 with other compounds is of great importance for overcoming its inherent shortages and improving the visible-light photocatalytic performance. Here we propose the construction of TiO 2 /covalent organic framework (COF) heterojunction with tight connection by a supercritical CO 2 (SC CO 2 ) method, which helps bridging the transformation paths for photo-induced charge between TiO 2 and COF. The produced TiO 2 /COF heterojunction performs a H 2 evolution of 3,962 µmol·g −1 ·h −1 under visible-light irradiation, which is ∼ 25 times higher than that of pure TiO 2 and 4.5 folds higher than that of TiO 2 /COF synthesized by the conventional solvothermal method. This study opens up new possibilities for constructing heterojunctions for solar energy utilization.
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高影响因子
CHINESE CHEMICAL LETTERS
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2020
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IF 4.632
Sijia Sun,Hao Ding,Lefu Mei,Ying Chen,Qiang Hao,Wanting Chen,Zhuoqun Xu,Daimei Chen
Using low-cost precipitated silica (SiO 2 ) as the carrier, a ternary SiO 2 -TiO 2 /g-C 3 N 4 composite photocatalyst was prepared via the sol-gel method associated with a wet-grinding process. The as-prepared composite exhibits photocatalytic hydrogen production and pollutant degradation performance under solar-like irradiation. The effect of SiO 2 carrier on the properties of the heterostructure between TiO 2 and g-C 3 N 4 (CN) was systematically studied. It is found that SiO 2 has important effects on promoting the interaction between TiO 2 and CN. The particle size of TiO 2 and CN was obviously reduced during the calcination process due to the effects of SiO 2 . Especially, the TiO 2 particles exhibit monodispersed state with particle size below 10 nm (quantum dots), resulting in the improvement of the contact area and the interaction between TiO 2 and CN, and leading to the formation of efficient TiO 2 /CN Z-scheme heterostructure in SiO 2 -TiO 2 /CN. Besides, the introduction of SiO 2 can increase the specific surface area and light absorption of SiO 2 -TiO 2 /CN, further promoting the photocatalytic reaction. As expected, the optimum SiO 2 -TiO 2 /CN composite exhibits 12.3, 3.1 and 2.9 times higher photocatalytic hydrogen production rate than that of SiO 2 -TiO 2 , CN and TiO 2 /CN under solar-like irradiation, while the photocatalytic active component in SiO 2 -TiO 2 /CN is only about 60 wt%. Moreover, the rhodamine B degradation rate of SiO 2 -TiO 2 /CN is also higher than that of SiO 2 -TiO 2 , CN and TiO 2 /CN.
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Materials Research Express
·
2020
·Vol. 7
·期 2
·025040
·
IF 1.929
Yang Tang,Fang Shen,Hao Huang,Hongyan Shang,Hui Mao,Jun Ma,Yang Liao,Shilin Zhao
Traditional TiO2 photocatalyst has the disadvantages of weak visible-light responsibility, fast combination of photo-generated electron and hole, which significantly degrade its photocatalytic degradation activity. Therefore, fluorine and carbon co-introduced TiO2 was synthesized at a relatively low calcination temperature via a modified sol-gel method, and then be thoroughly characterized to explore the structure-performance relationship. It was found the optimum catalyst FCT-200 prepared at calcination temperature of 200 °C exhibited remarkably enhanced visible-light absorption and restrained photo-generated carrier combination, which should be attributed to the F, C elements co-introduction, lower crystallization degree, and smaller particle size of anatase TiO2. With such advantages, the catalyst therefore demonstrated satisfactory photocatalytic degradation activity for 2,4,6-trichlorophenol (2,4,6-TCP) under visible-light irradiation. The apparent degradation rate reached as high as 0.41971 h−1, almost 42 folds higher than P25. It is anticipated that the fluorine and carbon co-introduced TiO2 photocatalyst presented in this work could provide a new insight into significantly improving the photocatalytic performance of TiO2.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Zhiping Yan,Wenchao Wang,Lili Du,Jixin Zhu,David Lee Phillips,Jingsan Xu
Heterojunctions of CdS quantum dots (QDs)/TiO 2 nanotube arrays (NTAs) were synthesized via a simple vapor transport approach. The 0D/1D QDs/NTAs electrodes exhibited 5-fold improvement efficiency for photocatalytic dye degradation and hydrogen evolution compared to pure TiO 2 NTAs in a photoelectrochemistry cell, which was attributed to the faster transportation and retarded recombination of electron-hole pairs in the 0D/1D heterostructures. Femtosecond transient absorption offers deep insights into the dynamics of the charge carriers, showing that surface-trapped electrons were generated within 1.2 ps. The lifetimes for recombination of electrons at shallow trap sites with holes and deep trapped electrons with holes are prolonged to 73.2 ps and 622.6 ps, respectively. The reduced charge transfer resistance is verified by electrochemical impedance spectroscopy. Mott-Schottky plots indicated downward shifts for both the conduction band and valence band in the heterostructure. Finally, a Z-scheme photoreactive mechanism is proposed to explain the enhanced catalytic activities.
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高影响因子
TALANTA
·
2020
·
IF 5.339
Aiying Liu,Hua Zhang,Jianhua Ding,Wei Kou,Fei Yan,Keke Huang,Huanwen Chen
Quantitative detection of phospholipids at the single cell level remains in challenge. Herein, the TiO 2 -coated Fe 3 O 4 nanoparticles were synthesized to selectively enrich trace phospholipids from single cell, which were then eluted using 1.5% ammonia/methanol (w/w) for sensitive detection by electrospray ionization mass spectrometry . Under the optimal experimental conditions, eighteen phospholipids in single cell samples were detected and identified by MS/MS experiments. The limit-of-detections (LODs) were 0.012 μ g/L for phosphatidylcholine (PC, 34:1) and 0.014 μ g/L for phosphatidylcholine (PC, 36:2) in PBS matrix, with the linear range of 0.05–50 μ g/L ( R 2 ≥ 0.999). The recovery rates of 94.90–104.00% were obtained, with the relative standard deviations (RSDs ≤ 6.90%). Quantitative determination of PC in real unicellular samples was also achieved, with the concentration of 1.82–2.11 μ g/L for PC(34:1) and 1.25–1.65 μ g/L for PC(36:2) in six types of single cell, opening up possibilities for quantitative analysis of trace compounds in complex bio-samples. A set of 6 types of tumor cells were analyzed and further differentiated by the partial least squares-discriminant analysis (PLS-DA). Conclusively, a facile method for the direct quantification of phospholipids in single cell samples has been developed, showing potential applications for advanced investigation of phosphorylated substance at the single cell level.
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高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2021
·Vol. 36
·期 14
·2961-2972
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IF 3.089
Zhu Lijun,Zhu Xinxin,Zhang Chao,Huo Tian,Hou Xinlan,Guo Dandan,Zhang Huiming,Xia Daohong
The zirconium-based porphyrin MOFs sensitized TiO 2 (PCN224–TiO 2 ) was synthesized in situ by self-assembly of porphyrin, ZrCl 4 with nano TiO 2 . The composite catalyst was determined by detailed structural and photoelectrochemical characterization. The UV–Vis absorption and fluorescence spectrum confirm that PCN224 and TiO 2 are coupled. The PCN224–TiO 2 had significant absorption of visible light and the PCN224–TiO 2 had the largest photo-generated current, which proved the porphyrin MOFs material has good internal conductivity and has a close combination with TiO 2 . Compared with carboxyphenyl porphyrin sensitized TiO 2 (HTCPP–TiO 2 ), mixture of TCPP and TiO 2 (TCPP/TiO 2 ) and PCN224, the PCN224–TiO 2 showed better removal performance of methylene blue under visible light. Under low-power xenon lamp irradiation, the removal rate of PCN224–TiO 2 (1:3) on methylene blue reached 93.2% in 4 h. And PCN224–TiO 2 had stable cycling catalytic performance. The PCN224–TiO 2 promoted the degradation process by strengthening the adsorption of organic pollutants, thus improving the removal performance. Graphic abstract
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高影响因子
Energy Technology
·
2021
·Vol. 10
·期 1
·2100259
·
IF 3.631
Ka Yang,Gang Cheng,Rong Chen,Kai Zhao,Ying Liang,Weijie Li,Chao Han
Developing an efficient photocatalyst for solar-to-hydrogen production is regarded as a promising approach to tackle the energy and environmental challenges that we are currently facing. Herein, the TiO 2 –Cu 2 O nanocomposite is synthesized via a chemical reduction approach at ambient temperature and used as a photocatalyst. The composition and structure characterizations indicate that Cu 2 O particles are loaded on the surface of TiO 2 nanospheres. The photocatalytic performance of the as-obtained materials is evaluated by a solar-to-hydrogen production test. It is found that the optimized TiO 2 –Cu 2 O nanocomposite (TC-20) exhibits a hydrogen evolution rate of 7139.02 μmol g −1 h −1 , which is nearly 7 times that of pristine TiO 2 . Based on the photoluminescence spectra and photo/electrochemical measurements, the boosted photocatalytic H 2 evolution performance comes from the promoted separation efficiency of photoinduced electron–hole pairs, which originates from the formed p–n heterojunction of the TiO 2 –Cu 2 O nanocomposite.
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