Journal of Cleaner Production
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2022
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IF 11.072
Xiaojuan Bai,Shengqi Yang,Chaohong Tan,Tianqi Jia,Linlong Guo,Wei Song,MeiPeng Jian,Xiaoran Zhang,Ziyang Zhang,Liyuan Wu,Hua Yang,Haiyan Li,Derek Hao
As the value of TiO 2 in environmental protection continues to be explored, it has broad potential for stone building protection. However, the hydrophilicity of TiO 2 makes it challenging to keep stable on the exterior of buildings and hydroxyl radicals generated under UV irradiation may be harmful to substrates. Herein, TiO 2 was wrapped with the SiO 2 shell by a modified Stöber method and superhydrophobic TiO 2 was obtained by grafting methyl groups on the SiO 2 shell. The TiO 2 @Si–Me core-shell system were dispersed in Paraloid B72 and applied on marble surfaces to investigate the self-cleaning effect of TiO 2 on the substrate. The results showed that the superhydrophobic TiO 2 nanoparticles significantly enhanced the surface roughness , which was beneficial to transform the acrylic resin coating from hydrophilic to hydrophobic and retain the original vapor permeability. The adsorption rate and degradation efficiency of methylene blue of TiO 2 @Si–Me core-shell system were 2.19 and 1.45 times higher than that of pure TiO 2 . Furthermore, the superhydrophobic TiO 2 did not change the color of the stone after UV aging, which contributed to maintaining the appearance of buildings. These findings will help to understand the role of photocatalytic nanomaterials in developing protective layers for stone construction and expand the application in the self-cleaning of the architectural environment.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Xueying Cheng,Renquan Guan,Yunning Chen,Yudan Qian,Qingkun Shang,Yingnan Sun
In this study, the adsorption and photocatalytic degradation of oxytetracycline (OTC) were systematically investigated using different metal-doped anatase-phase mesoporous TiO 2 nanocatalysts (M−TiO 2 , M = Fe, Co, Ni, Cr). The results showed that doping with different metals had a significant effect on the ability of TiO 2 to adsorb and degrade OTC . Comparing the photoelectric properties of four photocatalysts (Fe-TiO 2 , Co-TiO 2 , Ni-TiO 2 and Cr-TiO 2 ), it was observed that the mutual synergy between the separation ability of the photogenerated carriers and the adsorption ability of pollutants was the fundamental reason for the excellent photocatalytic performance of Fe-TiO 2 . The relative intensities of the high-resolution mass spectrometry (HRMS) peaks were used to track and analyse the degradation products of pollutants at different adsorption or light-irradiation times during the photocatalytic process. The ability of the pollutants to undergo dark-state adsorption significantly influenced their degradation paths and products. The possible mechanism of the photocatalytic decomposition of pollutants using Fe-TiO 2 along different paths was proposed according to the Fukui function calculation and MS results. To the best of our knowledge, this is the first time that quantitative HRMS results have been used to assess the degradation pathways of pollutants.
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Molecular Catalysis
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2022
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IF 5.089
Yiqing Zeng,Fengye Lyu,Yanan Wang,Shule Zhang,Qin Zhong,Zhaoxiang Zhong
High N 2 O selectivity of MnO x -TiO 2 catalyst hinders its development in ammonia selective catalytic reduction (NH 3 -SCR) of NO x . Herein, a series of MnO x -TiO 2 catalyst with different Mn/Ti ratio were prepared by wet-impregnation method to study the N 2 O formation during ammonia selective catalytic reduction (NH 3 -SCR) of NO x from the perspective of catalyst. It is found that MnO x and TiO 2 species are the mainly redox and acid sites for the NH 3 -SCR denitration reaction over MnO x -TiO 2 catalyst, respectively. As the Mn/Ti ratio increases, MnO x species layer expanded on TiO 2 support, leading to increase of redox sites but decrease of surface acid sites. These changes contribute to the occurrence of the no-selective oxidation of NH 3 on MnO x species and the over-activation of NH 3 at Mn-Ti interface, resulting in the formation of N 2 O via the route of 2NH 3 + 2O 2 → N 2 O + 3H 2 O and 4NO + 4NH 3 + 3O 2 → 4N 2 O + 6H 2 O, respectively. Through this work, it can be speculated that both improving MnO x dispersion and increasing surface acidity of catalyst are feasible strategy for suppressing the N 2 O formation on MnO x -TiO 2 .
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Frontiers in Chemistry
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2022
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IF 5.545
Lu Xin-Yang,Li Jing,Kong Fen-Ying,Wei Mei-Jie,Zhang Pei,Li Ying,Fang Hai-Lin,Wang Wei
An electrochemical sensor for sensitive sensing of acyclovir (ACV) was designed by using the reduced graphene oxide–TiO2–Au nanocomposite-modified glassy carbon electrode (rGO–TiO2–Au/GCE). Transmission electron microscopy, X-ray diffractometer, and X-ray photoelectron spectroscopy were used to confirm morphology, structure, and composition properties of the rGO–TiO2–Au nanocomposites. Cyclic voltammetry and linear sweep voltammetry were used to demonstrate the analytical performance of the rGO–TiO2–Au/GCE for ACV. As a result, rGO–TiO2–Au/GCE exerted the best response for the oxidation of ACV under the pH of 6.0 PB solution, accumulation time of 80 s at open-circuit, and modifier amount of 7 µl. The oxidation peak currents of ACV increased linearly with its concentration in the range of 1–100 µM, and the detection limit was calculated to be 0.3 µM (S/N = 3). The determination of ACV concentrations in tablet samples also demonstrated satisfactory results.
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CHEMOSPHERE
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2022
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IF 8.943
Danchen Zhao,Liushan Jiang,Ruochen Yang,Yue Zhang,Qingxiang Zhou
Polyaniline (PANI) is a useful conductive polymer material, and has good adsorption property, which makes it a good modification material. In this work, for the sake of highly enhancing the utilization of visible region in sunlight and accelerating photocatalytic degradation of tetrabromobisphenol A (TBBPA), a typical polybrominated flame retardant , titanium dioxide nanotube arrays (TiO 2 NTAs) were modified with PANI by chemical and electrochemical polymerization. The coated amount of PANI was controlled via adjusting the polymerization time and the amount of aniline in the electrochemical method . The results demonstrate that the EC-PANI/TiO 2 NTAs (synthesized electrochemically) exhibit higher catalytic activity than bare TiO 2 NTAs and C-PANI/TiO 2 NTAs (synthesized chemically) in photoelectrocatalytic degradation of TBBPA under visible light, and the degradation efficiency for TBBPA could reach 94.37% within 120 min. The improved performance was contributed to the synergetic effect of PANI modification which integrated the broad absorption of PANI in visible light region and high catalytic property of TiO 2 NTAs. Interestingly, it was also found that the degradation efficiency of TBBPA by EC-PANI/TiO 2 was further enhanced by up to 95.74% when the ethanol was present in the reaction system as the hole scavenger. Furthermore, the EC-PANI/TiO 2 exhibited excellent stability after 10 cycling experiments. All the results indicated that this new modified material presented strong potential as a photoelectrocatalyst and had great practical applications in the future.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 5
·2667-2676
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IF 2.779
Chen Jiajian,Deng Wei,Ren Yuanyuan,Qu Kexin,Li Guoan
Dielectric capacitor has been rapidly developed in recent years, and the ceramics nanofibers/polymer nanocomposites with improved dielectric properties have huge potential in exploitation and application. In this article, the barium titanate (BT) nanofibers were synthesized by electrospinning and encapsulated by titanium dioxide (TiO 2 ) via sol–gel method to prepare the core–shell structured BT@TiO 2 nanofibers and then utilized to prepare poly(vinylidene fluoride) (PVDF)-based nanocomposites. The study we have performed shows that the dielectric constant of BT@TiO 2 /PVDF composites with 4 vol% fillers increase to 24 at 1 kHz, accompanied with the low dielectric loss of 0.019. The breakdown strength of BT@TiO 2 /PVDF composites achieves 128 kV/mm at the content of 2 vol% BT@TiO 2 nanofibers, which is 150% of PVDF and 170% of BT/PVDF composites with the same content of fillers. Meanwhile, the tensile stress of BT@TiO 2 /PVDF composites also reaches the highest value of 44.01 MPa with 2 vol% fillers. In addition, the initial thermal decomposition temperature decreases with the increasing of BT@TiO 2 nanofibers.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2022
·Vol. 414
·期 6
·2065-2078
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IF 4.478
Ou Panpan,Wu Jiawen,Lin Yu,Tan Xuecai,Wu Yeyu,Chen Zhifan,Wei Fucun,Huang Kejing
Chloramphenicol (CAP) is widely used in the food industry and animal husbandry due to its effective antibiotic effect active against gram-positive and gram-negative microorganisms. However, research shows that it can cause serious adverse reactions and side effects in the human body. In order to effectively monitor the residues of CAP, a novel and simple photoelectrochemical (PEC) sensor for sensitive detection of CAP is fabricated based on M-TiO 2 -CdTe QDs/CdS QDs composite. The results show that the prepared M-TiO 2 not only retains the original morphology and structure of MIL-125(Ti), but also exhibits more abundant pore structure and good photoelectrochemical properties. Compared with M-TiO 2 , the as-prepared M-TiO 2 -CdTe QDs/CdS QDs composite exhibits excellent PEC performances including about ninefold enhancement of photocurrent intensity, which is ascribed to the large surface of M-TiO 2 and the introduction of CdTe QDs and CdS QDs. Based on the selective inhibitory effect of CAP in the photocurrent intensity of the M-TiO 2 -CdTe QDs/CdS QDs PEC system, a novel PEC sensor for CAP concentration determination is constructed. The designed PEC sensor demonstrates a linear range from 1 to 140 nmol L −1 with a detection limit of 0.14 nmol L −1 (S/N = 3). Moreover, the method is applied to real milk samples to quantify the CAP residues with spiked recoveries in the range of 96.3–106%, and the possible detection mechanism of the M-TiO 2 -CdTe QDs/CdS QDs PEC system is also discussed. Graphical abstract
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CERAMICS INTERNATIONAL
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2022
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IF 5.532
Yuan Liu,Weiwei Liu,Yang Zhou,Jingbo Chen,Zhiguo Wang,Wen Du,Jianhui Wen,Jun Cao,Dou Zhang
To investigate the influence of modification of ceramic fillers on the dielectric properties of polymer-based composites, TiO 2 and core-shell structured TiO 2 @HfO 2 nanowires were synthesized, and investigated in this study. TiO 2 nanowires/polyvinylidene fluoride (PVDF) and TiO 2 @HfO 2 nanowires/PVDF nanocomposites were prepared using the solution casting method. The experimental results showed that the TiO 2 @HfO 2 nanowires/PVDF composites had improved dielectric properties compared with that of the TiO 2 nanowires/PVDF composites. Owing to the enhanced interfacial polarisation by the multilevel interface, the composites with 10 wt % TiO 2 @HfO 2 nanowires achieved the highest permittivity of 12.56 at 1 kHz, which was enhanced by ∼72% compared to the PVDF matrix. The electric field was evenly distributed by building the fillers with a gradient dielectric constant. The characteristic breakdown strength of the composite with 5 wt % TiO 2 @HfO 2 reached 377.76 kV/mm, compared with that of 334.37 kV/mm for the composite with 5 wt % TiO 2 nanowires. This study initiated a novel strategy for preparing dielectrics with high dielectric constant and improved breakdown strength.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 8
·5886-5898
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IF 2.779
Tong Xingyu,Li Wei,Li Jiaying,Lu Shaowei,Wang Baichen,Ma Keming,Yang Chun,Li Qiuwen
Multi-component composite can effectively improve the electromagnetic interference shielding effectiveness (EMI SE) due to the synergistic effects. Herein, graphene aerogel (GA) provides a three-dimensional network framework and in situ generation of titanium dioxide (TiO 2 ) on its network layer by the sol–gel method. After microwave irradiation reduction, the titanium dioxide/microwave-reduced GA (TiO 2 /MRGA) was immersed in epoxy resin solution and cured to obtain its composite. The existence of the Ti–O–C bond proves the favorable combination of TiO 2 and MRGA. Under electromagnetic radiation, MRGA and TiO 2 generate a synergistic effect to improve the EMI SE of the composite. When the mass ratio of TiO 2 to MRGA is 1.5:1 (2.1 wt%+1.4 wt%), the composite exhibits a maximum EMI SE of 32.5 dB in the X band. Moreover, when the mass ratio of TiO 2 to MRGA is in the range of 1 to 1.8, the average EMI SE of the composites increases by 37% compared with that of the MRGA/Epoxy composite. The research indicates that this kind of EMI shielding composite has enormous application potential.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Ming-Yu Qi,Qiong Lin,Zi-Rong Tang,Yi-Jun Xu
Coupling CO 2 photoreduction with selective organic synthesis offers a promising modus operandi to enable simultaneous utilization of photogenerated electrons and holes to realize solar fuels production and chemicals synthesis. Herein, we report a bifunctional zero-dimensional cadmium sulfide quantum dots-two-dimensional titanium dioxide nanosheets (CdS/TNS) heterostructure for photoredox-catalyzed coupling of C–C bond synthesis via selective oxidation of benzyl alcohol with CO 2 photoreduction to CO under visible light. The compositing heterointerface is beneficial for the adsorption and activation of CO 2 , thereby promoting the photoreduction of CO 2 . Remarkably, the synergistic interaction between CdS and TNS tunes the selectivity of benzyl alcohol oxidation from carbonyl compound to the C–C coupled products. Mechanistic studies unveil that the generation of C–C coupled products processes via key radical •CH(OH)Ph intermediates. Theoretical simulations reveal that the weaker adsorption of •CH(OH)Ph radical over CdS/TNS than bare CdS contributes to the formation of highly selective C–C coupled products. The findings are expected to offer instructive guidance on rationally designing the dual-functional catalysts with efficient photoredox-catalyzed coupling reaction systems for integrating CO 2 reduction with selective organic transformations.
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NANO
·
2022
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IF 1.438
Mengfan Wang,Wenbo Miao,Hongliang Xu,Chaoning Huang,Mingliang Li,Gang Shao,Hailong Wang,Hongxia Lu,Rui Zhang
g–C 3 N 4 nanosheets were first synthesized by calcining the mixture of hydrochloric acid-pretreated melamine and ammonium chloride. Then, by the aiding of solvothermal method and hydrofluoric acid as morphology modifier, 001-TiO 2 /g–C 3 N 4 (TCN-X, X = 5 , 3, 2, 1) nanocomposites were synthesized using g–C 3 N 4 nanosheets and tetrabutyl titanate, with the mass ratio of g–C 3 N 4 to TiO 2 was 5:1, 3:1, 2:1 and 1:1, respectively. The as-synthesized samples were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy, Fourier transform infrared spectroscopy, nitrogen adsorption–desorption method, ultraviolet–visible diffuse reflectance spectrum, photoluminescence spectrum, etc. Their photocatalytic properties were evaluated under visible light irradiation with rhodamine B (RhB) as the target pollutant. The results reveal that the TCN-3 composites had a large specific surface area of 67.38 m 2 /g and consisted of g–C 3 N 4 nanosheets and anatase TiO 2 crystals about 10–20 nm in size. The (001) crystal planes of TiO 2 can be easily observed in TCN-X composites. All TiO 2 /g–C 3 N 4 composites exhibited excellent photocatalytic activity compared with the pure g–C 3 N 4 did. The photocatalytic property of TCN-X samples varied with the mass ratio of g–C 3 N 4 to TiO 2 , and TCN-3 presented the optimum photocatalytic performance. In total, 50 mg of TCN-3 completely degraded 50 mL and 100 mL of RhB solution (10 mg/L) in 15 min and 40 min, respectively. The reaction rate constant of TCN-3 was 6.7 times as large as that of pure g–C 3 N 4 . TCN-3 also presented outstanding activity for the photocatalytic degradation of the colorless tetracycline solution. The significant improvement in photocatalytic activity of TCN-3 was attributed to the evenly distribution of TiO 2 on g–C 3 N 4 , the enhanced specific surface area and the construction of 001-TiO 2 /g–C 3 N 4 heterojunction between the g–C 3 N 4 nanosheets and the (001) crystal planes of anatase TiO 2 , which greatly reduced the recombination rate of the photo-generated electron and hole.
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CHEMOSPHERE
·
2022
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IF 8.943
Chen Li,Guoqing Feng,Menghan Sun,Zonglin Pan,Xiaoqing Yan,Xinfei Fan,Chengwen Song,Tonghua Wang
Acidic organic wastewater with toxic and carcinogenic properties has long been a tough problem for industrial treatment. To break down the barrier of poor acidic stability as well as the high cost of materials and reactors, a novel strategy of utilizing a high-performance and acid-tolerant TiO 2 /carbon electrocatalytic membrane (TiO 2 /CEM) for acidic organic wastewater treatment was proposed. Study results showed that high concentrations of organic pollutants were separated and degraded by the synergistic effects of membrane separation and electrocatalytic oxidation simultaneously on the TiO 2 /CEM. The great treatment performance with membrane removal efficiency of >97.4% was obtained by treating acidic rhodamine B (RhB) dye wastewater under optimized applied voltage. Treatment experiments under various pH and electrochemical tests demonstrated the outstanding acid-tolerant property and long service life of TiO 2 /CEM. Furthermore, the feasibility of TiO 2 /CEM for industrial application and various acidic organic wastewater treatment was proved by treating typical organic pollutants (phenol, tetracycline and oil) under high acidic circumstances.
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