JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2023
·Vol. 29
·期 5
·864-876
·
IF 2.7
Chen Yu,Degang Li,Wenyuan Han,Yifan Kong,Lijie Zhang,Mingguang Chen,Kunsheng Hu
Titanium dioxide (TiO 2 ) has a strong oxidation effect when absorbing ultraviolet light. Therefore, when TiO 2 is used as a light stabilizer in polyvinyl chloride (PVC), it will cause the photodegradation of PVC. Herein, carbon quantum dots (CQDs) coated TiO 2 composite (TiO 2 @CQDs) was prepared by a one-step hydrothermal method. The prepared TiO 2 @CQDs were characterized by transmission electron microscopy (TEM), UV–Vis spectroscopy, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The photostability of PVC film containing TiO 2 @CQDs was investigated via photodegradation conductivity test, weight loss rate test, and ultraviolet aging test. Due to the down-conversion effect of CQDs under ultraviolet light, its existence can alleviate the photoaging of PVC. In addition, the thermal stability of PVC containing TiO 2 @CQDs was studied by conductivity tests and oven thermal aging tests. The presence of CQDs significantly improved the thermal stability of PVC. Meanwhile, the HCl absorption capacity of CQDs could reach 30.8 mg/g cat . According to the DFT calculations, this high absorption capacity is attributed to the HCl immobilization effect via forming hydrogen bonds between HCl and the keto oxygen, carboxyl keto oxygen in CQDs. The hydroxyl group in CQDs could also combine ZnCl 2 by forming a coordination bond.
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Catalysts
·
2023
·Vol. 13
·期 4
·727
·
IF 3.9
Jie Ren,Pingping Yang,Liuliu Wang,Hongyu Chen,Xingyu Lu,Qing Yang,Li Zou,Cheng Huang,Jiale Xie
Photoelectrochemical (PEC) urea splitting is of great significance for urea wastewater remediation and hydrogen production with low energy consumption simultaneously. Nickel hydroxides as electrocatalysts have been widely investigated for urea electrolysis. However, it is an open question how to synthesize highly catalytic Ni(OH)2for the PEC urea splitting. Herein, we take advantage of the instability of metal–organic frameworks (MOFs) to perform an in situ synthesis of Ni(OH)2catalysts on the surface of TiO2nanorod arrays. This transformed Ni(OH)2(T-Ni(OH)2) possesses a superior PEC catalytic activity for water/urea splitting in comparison to the Ni(OH)2prepared by the impregnation method. The in situ transition of a Ni-MOF is accomplished through an electrochemical treatment under AM1.5G illumination in a KOH-and-urea mixed electrolyte. The specific transition mechanism of Ni-MOFs is the substitution of ligands with OH−in a 1 M KOH electrolyte and the successive phase transition. The T-Ni(OH)2@TiO2photoanode delivers a high photocurrent density of 1.22 mA cm−2at 1.23 VRHE, which is 4.7 times that of Ni(OH)2@TiO2prepared with the impregnation method. The onset potential of T-Ni(OH)2@TiO2is negatively shifted by 118 mV in comparison to TiO2. Moreover, the decline of photocurrent during the continuous test can be recovered after the electrochemical and light treatments.Keywords:photoelectrochemical urea splitting;urea oxidation reaction;titanium dioxide;metal–organic framework;in situ transition
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Materials Today Sustainability
·
2023
·
IF 7.8
Y. Wang,X. Wu,L. Guo,Q. Li,S. Wang
In this study, polylactic acid (PLA) composites with a content of 1 wt% titanium dioxide (TiO 2 ) were prepared by melt extrusion and then annealed in order to further enhance their crystalline properties and barrier properties. It is found that α-crystals with tight packing and a more perfect structure were formed under annealing treatment at a higher temperature. The crystallinity of PLA/1T composites annealed at 115 °C for 60 min reached 34.08%. The mobility of molecular chains in the amorphous region was limited by the increase of the crystalline region and thus reduces the solubility and diffusion coefficient of water. The water vapor barrier properties of the PLA/1T composite annealed at 115°C for 60 min were improved by 22.34% compared with the unannealed one. The structure of the annealed PLA/1T composites is more compact, and the surface roughness decreases, which increases the surface hydrophobicity and water resistance of the composites. The increase in crystallinity leads to an increase in the stiffness of the PLA/1T composite. The tensile properties of the PLA/1T composite were further improved by the annealing treatment. The annealing treatment provides a technical method to balance the water vapor barrier properties and degradation properties of PLA.
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MOLECULES
·
2023
·Vol. 28
·期 7
·3262
·
IF 4.6
Shuya Xue,Min Shi,Jinye Wang,Jiapeng Li,Guanwei Peng,Jingkun Xu,Yansha Gao,Xuemin Duan,Limin Lu
In this work, TiO2-MXene/poly (3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) composite was utilized as an electrode material for the sensitive electrochemical detection of baicalein. The in-situ growth of TiO2nanoparticles on the surface of MXene nanosheets can effectively prevent their aggregation, thus presenting a significantly large specific surface area and abundant active sites. However, the partial oxidation of MXene after calcination could reduce its conductivity. To address this issue, herein, PEDOT:PSS films were introduced to disperse the TiO2-MXene materials. The uniform and dense films of PEDOT:PSS not only improved the conductivity and dispersion of TiO2-MXene but also enhanced its stability and electrocatalytic activity. With the advantages of a composite material, TiO2-MXene/PEDOT:PSS as an electrode material demonstrated excellent electrochemical sensing ability for baicalein determination, with a wide linear response ranging from 0.007 to 10.0 μM and a lower limit of detection of 2.33 nM. Furthermore, the prepared sensor displayed good repeatability, reproducibility, stability and selectivity, and presented satisfactory results for the determination of baicalein in human urine sample analysis.Keywords:TiO2-MXene;oxygen vacancy;PEDOT:PSS;baicalein;electrochemical sensor
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Zeying Liu,Zixuan Chen,Huaxia Xie,Yali Cui,Hong-Jian Feng,Kai Hua
The antibacterial effect induced by photocatalysis of UV-irradiated TiO 2 has been widely studied. The present work reveals that Ag + implanted TiO 2 film shows significantly enhanced antibacterial activity without the application of UV light. Density functional calculations show that the existence of the implanted Ag + tends to change the electric field leading to a gradient band alignment of TiO 2 near the interface, favoring the charge transfer from the TiO 2 side to the membrane of the bacteria. Our density functional calculations clearly demonstrate the strong evidence of charge transfer channeling from the conduction band of Ag + implanted TiO 2 to the bacteria membrane which produces large amount of reactive oxygen species (ROS, including O 2 •– , H 2 O 2 and •OH). The ROS lead to bacteria death by inducing physiological changes such as membrane break, leakage of intracellular components, protein denaturation and DNA lesions. This work unravels the antibacterial mechanism of Ag + implanted TiO 2 , and contributes furtherly to the rational design and modification of biomaterials by Ag + implantation.
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International Journal of Environmental Research and Public Health
·
2023
·Vol. 20
·期 4
·3437
·
IF 4.614
Fan Zhao,Yini Chen,Shiyang Zhang,Meng Li,Xinhua Tang
A three-dimensional (3D) anode is essential for high-performance microbial fuel cells (MFCs). In this study, 3D porous carbon monoliths from a wax gourd (WGCM) were obtained by freeze-drying and carbonization. Nano-TiO2was further coated onto the surface of WGCM to obtain a nano-TiO2/WGCM anode. The WGCM anode enhanced the maximum power density of MFCs by 167.9% compared with the carbon felt anode, while nano-TiO2/WGCM anode additionally increased the value by 45.8% to achieve 1396.2 mW/m2. WGCM enhancement was due to the 3D porous structure, the good conductivity and the surface hydrophilicity, which enhanced electroactive biofilm formation and anodic electron transfer. In addition, nano-TiO2modification enhanced the enrichment ofAcinetobacter, an electricigen, by 31.0% on the anode to further improve the power production. The results demonstrated that the nano-TiO2/WGCM was an effective anode for power enhancement in MFCs.Keywords:microbial fuel cells;anode;carbon monolith;nano-TiO2;Acinetobacter
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Mengdan Guan,Jin Wang,Kaili Wang,Junjie Wang,Rajkumar Devasenathipathy,Shunhao He,Liuyingzi Yu,Linrong Zhang,Haijiao Xie,Zhuoyao Li,Gang Lu
Photocatalytic evolution of hydrogen is becoming a research hotspot because it can help to produce clean energy and reduce environmental pollution. Titanium dioxide (TiO 2 ) and its composites are photocatalysts that are widely used in hydrogen evolution because of their high abundance in nature, low price, and high photo/chemical stability. However, their catalytic performances still need to be further improved, particularly in the visible light spectrum. Herein, visible light-driven photocatalytic evolution of hydrogen on Au/TiO 2 nanocomposite is enhanced ∼ 10 folds by selectively functionalizing the nanocomposite with cysteamine molecules. It is revealed that the amine group (–NH 2 ) in cysteamine favors the transfer and separation of photo-generated hot carriers. The rate of hydrogen produced can be further tuned by varying the ionization of the functionalized molecules at different pH values. This work provides a simple, convenient, and effective method that can be used to improve the photocatalytic evolution of hydrogen. This method can also be used for many other nanocatalysts (e.g., Au-MoS 2 , Au-BiVO 4 ) and catalytic reactions (e.g., carbon dioxide reduction, nitrogen reduction).
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Yaxin Zhang,Zhuang Chen,Yimei Zhang,Wenwen Gu,Wendy Huang,Jiangshan Xi,Ting Cao,Yingjie Yu,Mingwang Yang,Luoyilang Ke
In this system, a highly-exposed TiO 2 photoanode was prepared as an effectively photoelectrocatalyst peroxymonosulfate (PMS) activator. Especially, we realize the highly-exposed TiO 2 grown on negatively charged MXene nanosheet which could provide dual active sites for stimulating PMS. The catalysts were characterized by XRD, XPS, SEM, UV–vis, Raman, TEM, and BET. The specific surface area for highly-exposed TiO 2 (S-400) is 10 times than Bulk catalyst (B-400), which is displayed in the BET result. The experimental results show that high exposure catalyst has excellent photoelectric activation performance. The degradation efficiency of the PEC + PMS system was 2.94 times higher than the EC + PMS and 2.76 times higher than the PC + PMS process. Compare with free PMS (1.36˚A), PMS adsorbed at the photoanode interface has a high bond angle (2.85˚A) easily to decompose into strong oxidizing SO 4 − . The electrochemical characterization results demonstrated that the highly-exposed TiO 2 had a higher separation rate of photogenerated carriers. From quenching experiments, the holes (h + ) contributed 80 % to BPA degradation in PEC + PMS system, the contribution order of other active radicals was O 2 − >SO 4 − > OH. It will help improving the control of the optimal free radical ratio. The probable mechanism and pathway of BPA degradation were suggested e − reacts with PMS and other substances to generate radicals. The research offers a new strategy for the effective activation about PMS to oxidation of the refractory organics. Besides, the results provide useful theoretical guidance for the development of new high-activity materials.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zhengren Yang,Yuhua Zhen,Yao Feng,Xiaolin Jiang,Zheng Qin,Wenjie Yang,Yuanyue Qie
A systematic study was performed on PM2.5 filtration and photodegradation performance of polyacrylonitrile @TiO 2 / zeolitic imidazolate framework-8（PTZ）hybrid membrane. The hybrid membrane was prepared by electrospinning technique and in situ Metal-organic frameworks (MOFs) synthesis. The optimized membrane maintained a good PM2.5 capture efficiency (greater than 99%) and a pressure drop of 34 Pa. The larger specific surface area and higher pore structure enhance the filter interception effect and electrostatic interaction, which can have high applications for the filtering of PM2.5. In addition, zeolitic imidazolate framework-8 (ZIF-8) is uniformly coated on the surface of polyacrylonitrile @ TiO 2 (PT) nanofiber to form N -Ti-O bonds, thus reducing the reorganization of electron-hole pairs and improving the efficiency of photodegradation. Compared with PT, the hybrid structure formed by PTZ has a higher degradation efficiency for PM2.5 (increased from 66% to 85%). The produced PTZ membrane exhibits a promising future in the collection and green degradation of PM2.5.
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高影响因子
FUEL
·
2022
·
IF 8.035
Xu Li,Long Yan,Ziyue Liu,Yuhe Liao,Longlong Ma
Catalytic hydrodeoxygenation (HDO) of oxygenated compounds is essential for chemical refining, which is always carried out under high temperature, hydrogen pressure or/and strong acids. Herein, we developed a novel Pt/TiO 2 (B) catalyst for the ambient HDO process. With the modified organic functional TiO 2 (B) nanosheets, the catalytic activity of Pt/TiO 2 (B) was significantly improved. Through the synergistic effect of highly dispersed Pt species and TiO 2 (B) supports, phenol was efficiently converted into cyclohexane and concomitant cyclohexanol under 50 °C and atmospheric hydrogen without extra acid. The characterizations of catalysts showed that the introduction of organic functional groups not only led to the formation of highly dispersed Pt species, but was also conducive to the yielding of key HDO intermediates. Due to the low C O bond energy of enol intermediates, the HDO of phenol could be carried out at mild conditions through the implementable C O bond cleavage of enol intermediates. This study provides a new understanding of the green HDO process and a novel approach for HDO catalyst development.
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Coatings
·
2023
·Vol. 13
·期 1
·145
·
IF 3.4
Jin Xiang,Shuchang Wang,Yuanxin Cao,Lining Fang,Wei Ke,Hui Guo,Baoyu Duan,Wenhe Yu,Liang Li,Zilong Zhao
As an environmental semiconductor material, TiO2has important applications in the fields of environmental protection and water treatment. The preparation of P25 particles into nano-functional material films with a high specific surface area has always been a bottleneck limiting its large-scale application. In this paper, a one-step method of preparing TiO2nanocomposites by doping carbon nanotube (CNT) and carbon quantum dots (CQD) with tetrabutyltitanate and P25 TiO2under ultrasonic radiation is proposed to synthesize a novel antifouling material, which both eliminates the bacterium of Escherichia coli and shows good photoelectric properties, indicating a great value for the industrial promotion of TiO2/CNT. This mesoporous composite exhibits a high specific surface area of 78.07 M2/g (BET) and a tested pore width range within 10–120 nm. The surface morphology of this composite is characterized by TEM and the microstructure is characterized through XRD. This preparation method can fabricate P25 particles into a nano-functional material film with a high specific surface area at a very low cost.Keywords:TiO2;carbon quantum dots;one-step synthesis;ultrasonic radiation;carbon nanotube;mesoporous nanocomposites
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Chongyi Wang,Yuxin Liu,Rong Chen,Xun Zhu,Dingding Ye,Yang Yang,Qiang Liao
In this work, a photocatalytic fuel cell (PFC) with a gas diffusion TiO 2 photoanode is proposed to directly convert chemical energy contained in volatile organic compounds into electricity by using solar energy. The gas diffusion TiO 2 photoanode is prepared by coating TiO 2 nanoparticles onto Ti mesh, whose intrinsic porous structure allows for gaseous pollutants to directly transfer inside the photoanode and thereby enhances mass transport. The feasibility of the developed gas diffusion photoanode is demonstrated by degrading toluene as a model gaseous pollutant. It is shown that the newly-developed PFC yields better electricity generation and toluene removal efficiency due to the enhanced mass transport of toluene and the eliminated interference of gas bubbles. The short-circuit current density and maximum power density of the PFC with a gas diffusion TiO 2 photoanode (0.1 mA/cm 2 and 0.02 mW/cm 2 ) are about 3.3 times and 4 times as those of the bubbling PFC (0.03 mA/cm 2 and 0.005 mW/cm 2 ), respectively. Both the discharging performance and toluene removal efficiency increase with increasing the light intensity and electrolyte concentration, while there exists an optimal gas flow rate leading to the best performance. The present work provides an innovative strategy for clean processing of volatile organic compounds while recycling the contained chemical energy.
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