INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
·
IF 3.141
Qian Wei,Oluwasola Oribayo,Xianshe Feng,Garry L. Rempel,Qinmin Pan
Sponge-like superhydrophobic and superoleophilic materials are attracting significant attention for effective cleanup and recovery of spilled oils from water. We report on the synthesis of TiO2 nanoparticle/polyurethane (TPU) composite foam substrate and its surface modification with tetradecylamine (TDA)-amidated graphene oxide (GO-TDA), thereby forming superhydrophobic and superoleophilic TPU-GO-TDA sorbent for oil spill clean-ups. Spectroscopic analyses confirmed that TDA was successfully grafted onto GO and the reduced GO by TDA was successfully grafted onto the TPU foam. Sorption experiments with engine oil, crude oil, silicone oil, and chloroform demonstrated that the TPU-GO-TDA foam was an effective sorbent with sorption capacity of 20.2–62.4 times its own weight. The absorbed oils in the sorbent could be recovered simply by squeezing the oil-laden foam. The much higher selectivity to oils and better reusability of the TPU-GO-TDA foam than commercial sorbents make the TPU-GO-TDA foam promising for the separation and recovery of spilled oils and organic solvents from water.
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RESEARCH ON CHEMICAL INTERMEDIATES
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2018
·Vol. 44
·期 10
·6369-6385
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IF 1.674
Chen Zhangxu,Fu Ming-Lai,Huang Xiao-Dan,Yuan Baoling,Yang Jia-Cheng E.
To enhance photocatalytic activity spectra area of the TiO 2 based photocatalyst, and to separate and recycle photocatalyst easily, magnetic photocatalyst was prepared with β-NaYF 4 :Yb 3+ ,Tm 3+ , TiO 2 , Fe 3 O 4 as carriers, and tetraethyl orthosilicate as precursor. The magnetic infrared responsive photocatalysts were thoroughly characterized by field emission scanning electron microscopy, X-ray diffraction, a fluorescence spectrometer and UV–Vis–NIR diffuse reflectance spectroscopy. They showed that the composite of β-NaYF 4 :Yb 3+ ,Tm 3+ /TiO 2 /Fe 3 O 4 @SiO 2 (UCTFS) emits visible luminescence upon 980 nm excitation, and energy transfer from β-NaYF 4 :Yb 3+ ,Tm 3+ to TiO 2 was verified. The photocatalytic activities of the UCTFS were studied by orthogonal experiments for photodegradating methylene blue (MB). The degradation rate of MB can reach 86.69% under the optimal conditions. After the four recycles, the degradation rate remained 52.72%. It also showed that 50.27% of the degradation efficiency of phenol can be obtained under the same experimental parameters. These results suggest that magnetic UCTFS composite is stable and a magnetic NIR-driven photocatalyst for degradation of organic pollutants. Moreover, the NIR driven photocatalytic mechanism of this reported composite was proposed. The strategy suggested here may be indicated for the effective fabrication of magnetic NIR-driven photocatalyst for application in the water purification by full spectra of solar energy.
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RSC Advances
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2018
·Vol. 8
·期 37
·20576-20584
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IF 2.936
Ningxian Hao,Yang Wei,Jialiang Wang,Zhiwei Wang,Zhaohua Zhu,Shulin Zhao,Min Han,Xiao Huang
Electrochemical and photoelectrochemical (PEC) oxygen evolution reactions (OER) are receiving considerable attention owing to their important roles in the overall water splitting reaction. In this contribution, ternary NiFeCo-layered double hydroxide (LDH) nanoplates were in situ hybridized with Ti3C2Tx (the MXene phase) via a simple solvothermal process during which Ti3C2Tx was partially oxidized to form anatase TiO2 nanoparticles. The obtained Ti3C2Tx/TiO2/NiFeCo-LDH composite (denoted as TTL) showed a superb OER performance as compared with pristine NiFeCo-LDH and comercial IrO2 catalyst, achieving a current density of 10 mA cm−2 at a potential of 1.55 V versus a reversible hydrogen electrode (vs. RHE) in 0.1 M KOH. Importantly, the composite was further deposited on a standard BiVO4 film to construct a TTL/BiVO4 photoanode which showed a significantly enhanced photocurrent density of 2.25 mA cm−2 at 1.23 V vs. RHE under 100 mW cm−2 illumination. The excellent PEC-OER performance can be attributed to the presence of TiO2 nanoparticles which broadened the light adsorption to improve the generation of electron/hole pairs, while the ternary LDH nanoplates were efficient hole scavengers and the metallic Ti3C2Tx nanosheets were effective shuttles for transporting electrons/ions. Our in situ synthetic method provides a facile way to prepare multi-component catalysts for effective water oxidation and solar energy conversion.
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Frontiers in Chemistry
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2018
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IF 4.155
Osin Oluwatomiwa A.,Yu Tianyu,Cai Xiaoming,Jiang Yue,Peng Guotao,Cheng Xiaomei,Li Ruibin,Qin Yao,Lin Sijie
The photocatalytic activity of TiO2 based photocatalysts can be improved by structural modification and elemental doping. In this study, through rational design, one type of carbon and nitrogen co-doped TiO2 (C, N-TiO2) photocatalyst with mesoporous structure was synthesized with improved photocatalytic activity in degrading 4-nitrophenol under simulated sunlight irradiation. The photocatalytic degradation efficiency of the C, N-TiO2 was much higher than the anatase TiO2 (A-TiO2) based on absorbance and HPLC analyses. Moreover, using zebrafish embryos, we showed that the intermediate degradation compounds generated by photocatalytic degradation of 4-nitrophenol had higher toxicity than the parent compound. A repeated degradation process was necessary to render complete degradation and non-toxicity to the zebrafish embryos. Our results demonstrated the importance of evaluating the photocatalytic degradation efficiency in conjunction with the toxicity assessment of the degradation compounds.
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BIOSENSORS & BIOELECTRONICS
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2018
·
IF 8.173
Xiaoqiang Liu,Peipei Liu,Yunfei Tang,Liwei Yang,Lele Li,Zhichong Qi,Deliang Li,Danny K.Y. Wong
In this work, a sensitive photoelectrochemical aptasensor was developed for kanamycin detection using an enhanced photocurrent response strategy, which is based on the surface plasmon resonance effect of gold nanoparticles deposited on a 3D TiO 2 -MoS 2 flower-like heterostructure . A significant aspect of this development lies in the photoelectrochemical and morphological features of the unique ternary composite, which have contributed to the excellent performance of the sensor. To develop an aptasensor, mercapto-group modified aptamers were immobilised on the photoactive composite as a recognition unit for kanamycin. The TiO 2 -MoS 2 -AuNP composite was demonstrated to accelerate the electron transfer , increase the loading of aptamers and improve the visible light excitation of the sensor. Under optimal conditions, the aptasensor exhibited a dynamic range from 0.2 nM to 450 nM of kanamycin with a detection limit of 0.05 nM. Overall, we have successfully synergised both the electrical and the optical merits from individual components to form a ternary composite, which was then demonstrated as an effective scaffold for the development of PEC biosensors.
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CARBOHYDRATE POLYMERS
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2018
·
IF 5.158
Maiping Yang,Weiqu Liu,Chi Jiang,Sha He,Yankun Xie,Zhengfang Wang
The purpose of this paper is to propose a facile, green and low-cost approach of the preparation of superhydrophobic cotton textiles, which can be fabricated with fluorinated TiO 2 sols via a sol-gel method. The coating was prepared with TiO 2 sols catalyzed with acetic acid, then modified by poly(Hexafluorobutyl methacrylate) (PHFBMA) which was synthesized by free radical polymerization. The wettability, surface morphology and chemical composition of pristine and modified cotton fabrics were investigated. The modified fabric presents a high contact angle reached up to 152.5°. The successful incorporation of fluorinated TiO 2 nanoparticles into cotton fabric was verified by the above measurements results. Additionally, the chemical stability of the coated fabric has been tested by immersing in different pH solutions and organic solvents, demonstrating the outstanding water repellency of the fabric. Furthermore, the treated cotton fabric shows excellent self-cleaning properties, which makes it an ideal material for large-scaled industrial applications in various conditions.
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Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 22
·3800-3810
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IF 4.776
Madiha Saeed,M. Zubair Iqbal,Wenzhi Ren,Yuanzhi Xia,Chuang Liu,Waheed S. Khan,Aiguo Wu
Photothermal therapy (PTT) has emerged as one of the promising cancer therapy approaches. However, nanoparticles (NPs) which are used for PTT might be biopersistent and potentially toxic. The current research explores the promising use of Fe3O4 nanoflowers as nontoxic, efficient photothermal, and strong T2 type magnetic resonance imaging (MRI) contrast agents for imaging-guided photothermal cancer therapy. In this study, a facile solvothermal method is used to fabricate PEG-coated Fe3O4 nanoflowers with controllable dimensions. Their successful fabrication, the effect of the reaction parameters, and their magnetic properties are investigated in depth. The therapeutic performance of the Fe3O4 nanoflowers (Fe-NFs) is evaluated and compared with commercially available black TiO2 nanoparticles (b-TiO2) under an 808 nm laser. The photothermal therapy efficiency of the Fe-NFs is observed to be better than that of the reported Fe3O4 nanoparticles. In vitro and in vivo investigation demonstrates that the therapeutic performance of the Fe-NFs is comparable to that of b-TiO2. Moreover, the Fe-NFs show excellent magnetic properties and magnetic resonance imaging capability to monitor therapeutic performance.
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IONICS
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2018
·Vol. 24
·期 12
·3975-3982
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IF 2.347
Wang Lu,Luo Hang,Zhou Xuefan,Wei Anqi,Zhou Kechao,Chen Zhuo,Zhang Dou
As the electronic industry developed rapidly, greater demands are required on the performance of dielectric composites, such as high permittivity, low dielectric loss, and high-energy density. Improving the compatibility of fillers in polymer matrix and uniform distribution of the electric field could increase the permittivity of such composites. Therefore, BaTiO 3 nanoparticles were coated by TiO 2 sol to fabricate BaTiO 3 @TiO 2 core-shell structured fillers in this paper. BaTiO 3 @TiO 2 fillers with gradient permittivity were firstly modified by dopamine in order to disperse in the composites homogeneously and adhere to poly(vinylidene fluoride- co -hexafluoropropylene) (P(VDF-HFP)) matrix tightly. At 1 kHz, the permittivity of the composite with 20 vol% BaTiO 3 @TiO 2 was 32.15, obviously larger than that of pure P(VDF-HFP) (6.92), and the dielectric loss was just 0.052. Consequently, the discharged energy density of the composite was enhanced to 0.23 J/cm 3 at 40 kV/mm, which was two times higher than that of pure P(VDF-HFP). This work provides a feasible approach to prepare high-performance dielectric composites.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 12
·8269-8275
·
IF 1.354
Wang Manchao,Peng Lin,Wang Jiahui,Li Changqing,Guan Lihao,Lin Yuqing
In this study, hierarchical ternary nanocomposites, i.e., Cu–TiO2-mesoporous silica microspheres (Cu–TiO2-MSM), were synthesized as ternary photocatalyst system to improve the visible light photocatalytic degradation of the environmental pollutant model
dye methylene blue (MB). The innovation of this method is in situ depositing TiO2 and Cu2O nanoparticles sequentially onto the surface of mesoporous silica microspheres to form highly active heterostructure. The improved activity for the degradation of MB is attributed
to: (1) the high adsorption capacity of the porous and interconnected-channel-structure MSM to MB; (2) the valence band electrons of TiO2 released from the conduction band generating abundant highly active free radicals, which directly reacted with adsorbed MB. The photocatalytic
degradation efficiency to MB was found to be 98% in 5 min, and almost 100% in 20 min. This study paves a way for the development of a ternary-doped catalyst for visible light photocatalytic degradation and may exhibit widely application in industry.
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Arabian Journal of Chemistry
·
2018
·
IF 2.969
Junyan Kuang,Zipeng Xing,Junwei Yin,Zhenzi Li,Siyu Tan,Meng Li,Jiaojiao Jiang,Qi Zhu,Wei Zhou
Ti 3+ self-doped rutile/anatase/TiO 2 (B) mixed-crystal tri-phase heterojunctions photocatalysts are fabricated via hydrothermal approach and mechanochemical process, followed by in-situ solid-state chemical reduction approach. The as-prepared samples are characterized by X-ray diffraction, Raman, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectroscopy. The photocatalysts are consisted by anatase/rutile TiO 2 nanoparticles and 1D TiO 2 (B) single-crystalline nanorods, which form rutile/anatase/TiO 2 (B) tri-phase heterojunctions. The visible-light-driven photocatalytic degradation rates of methyl orange and phenol are up to ∼98 and 97%, which are 2.2 and 1.8 times higher than that of commercial Degussa P25, 2.3 and 2.2 times higher than that of pure TiO 2 (B) as well. The enhancement can be attributed to the synergistic effect of special nanostructure, tri-phase heterojunctions, oxygen vacancy and Ti 3+ self-doping, which facilitates the absorption of visible light and the spatial separation of photo-generated charge carriers. This work provides a new perspective for designing high-active visible-light-driven photocatalyst in future.
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CATALYSIS TODAY
·
2018
·
IF 4.667
Ganeshraja Ayyakannu Sundaram,Suresh Maniarsu,Reddy P. Vijendar,Ganapathy Veerappan,Vaithinathan Karthikeyan,Kiyoshi Nomura,Junhu Wang
Controlled silver chloride (0.01–0.50 mol%) and tin co-doped micro-spherical titania (AgCl@Sn-TiO 2 ) with enhanced visible range absorption is prepared through hydrothermal synthesis. Multi-element doped rutile TiO 2 nanocrystalline electron transporting layer (ETL) in perovskite solar cell (PSC) is reported for the first time, which uplifts the photovoltaic performance comparing with undoped TiO 2 electrodes. Theoretical DFT studies, investigating the change in electronic density of states with respect to the doping are performed. An optimum efficiency of 10.4% was achieved for 0.01% doped AgCl@Sn-TiO 2 , which provided highest efficiency with higher stability over 650 h comparing to undoped TiO 2 (10.0%) ETL based PSC prepared under the same ambient conditions. This report proves that, the AgCl@Sn-TiO 2 is one of the efficient materials having good potential for application in photoenergy conversion devices and may provide new insight into the design of advanced perovskite solar cells with titania based electron transport materials.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2018
·
IF 4.61
Lingling Zhang,Zhaoxi Zhang,Xi He,Lei Zheng,Shikun Cheng,Zifu Li
Engineered nanoparticle materials (ENMs) are widely and increasingly produced and employed in many sectors. The use of diverse ENMs potentially leads to the release of multiple ENMs into the environment. These ENMs after discharge will be end in wastewater treatment plant and present in sludge. This work investigated the effect of multi-ENMs systems of ZnO and TiO 2 on sludge anaerobic fermentation and the related toxicity mechanism. Results revealed that the toxicity of ZnO ENMs on anaerobic fermentation was reduced in the presence of TiO 2 ENMs. Investigation on the change of free Zn 2+ and reactive oxygen species ( OH and H 2 O 2 ) suggested that both of free Zn 2+ and ROS contributed to the toxicity mechanism. Zn 2+ decrease was the main reason for the reduced toxicity in multi-ENMs systems. ROS mainly led to the reduction of cell viability in anaerobic fermentation systems. The presence of TiO 2 in the multi-ENMs systems promoted the recovery of enzyme activity, cell viability and bacteria abundance.
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