Journal of Cleaner Production
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2020
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IF 7.246
Chun Pei,Ji-Hua Zhu,Feng Xing
Titanium dioxide (TiO 2 ) photocatalyst coatings on cement material surfaces of buildings or structures that require high mechanical integrity, such as tunnel walls and pedestrian roads, can directly utilize solar energy for self-cleaning surfaces and removing air pollutants in the environment. However, TiO 2 can utilize only ultraviolet (UV) light, which accounts for only 5% of sunlight. To improve photocatalytic efficiency, graphene/TiO 2 nanocomposites are prepared by a sol-gel assisted electrospray method and characterized by various instrumental analysis methods. Photocatalytic cement mortars are prepared by incorporating the as-prepared nanocomposites and commercial TiO 2 into cement mortar. The self-cleaning and air purifying properties of the cement mortars are evaluated by the discoloration of rhodamine B (RhB) and the removal of nitric oxide (NO). As desired, cement mortar coated with graphene/TiO 2 nanocomposites expresses high photocatalytic effectiveness on both RhB and NO. In addition, the regeneration of graphene/TiO 2 nanocomposite photocatalysts has also been studied. The results show that the photocatalytic activity can be effectively regenerated by UV irradiation, with good repeatability and stability. Therefore, graphene/TiO 2 -coated cement mortar is a potential candidate for effective building self-cleaning and air purification through the use of solar irradiation .
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PROGRESS IN ORGANIC COATINGS
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2020
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IF 4.469
Zhiping Huang,Wenjie Zhao
Epoxy resin (EP) composite coatings enhanced with hexagonal boron nitride (HBN) nano-sheets, TiO 2 particles and HBN-TiO 2 hybrid material were fabricated successfully on the surface of 304L stainless steel. The structural and morphological features of HBN, TiO 2 and HBN-TiO 2 hybrid obtained from mechanical peeling and sol-gel method were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), Raman spectroscopy, XRD patterns, FT-IR spectra and XPS spectra. Moreover, tribological characteristic of composite coatings was investigated by UMT-3 tribometer. Mechanical behavior, worn surface, steel ball surface and debris size distribution of composite coatings were detected to investigate the tribological mechanism. The results demonstrated that HBN/EP, TiO 2 /EP and HBN-TiO 2 /EP composite coatings showed remarked promotion of mechanical behavior compared with the neat EP, especially for the improvement of hardness. The HBN-TiO 2 /EP composite coating, whose wear rate decreased by 65.8 % in comparison with the neat EP, manifested prominent tribological performance ascribed to the load carrying capacity of TiO 2 and the reduction of self-lubricating effect on the size of debris.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Min Chen,Honghong Wang,Xueyan Chen,Fei Wang,Xiaoxiao Qin,Changbin Zhang,Hong He
Photocatalysis is regarded as a promising method for indoor formaldehyde (HCHO) removal, and there remains a strong demand for the development of highly efficient photocatalysts for HCHO oxidation under visible light. Herein, by grafting nano CuO x clusters onto TiO 2 , the higher performance is achieved over Cu-TiO 2 for the photocatalytic oxidation of HCHO under visible light compared with the typical photocatalysts N-TiO 2 and g-C 3 N 4 . It is found that the presence of water greatly promotes the activity of HCHO oxidation on Cu-TiO 2 . The characterization results indicate that the CuO x clusters on TiO 2 exhibit high redox reversibility between Cu (II) and Cu (I) and greatly facilitate the migration of electrons. The mechanism of photocatalytic oxidation of HCHO was explored by using in situ DRIFTS measurements and DFT calculations. It is shown that HCHO is firstly oxidized to dioxymethylene (DOM), and then DOM is transformed into formate species under visible light irradiation. DFT calculations results indicate that the OH species are responsible for surface formate decomposition, which is the rate-determining step, while O 2 − radical is not active in formate decomposition. Our findings improve the understanding on the photocatalytic oxidation of HCHO, and the Cu-TiO 2 catalyst is a promising candidate for practical application in indoor air purification.
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Journal of Environmental Sciences
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2020
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IF 4.302
Yanke Yu,Jiali Zhang,Changwei Chen,Chi He,Jifa Miao,Huirong Li,Jinsheng Chen
CuSO 4 /TiO 2 catalysts with high catalytic activity and excellent resistant to SO 2 and H 2 O, were thought to be promising catalysts used in Selective catalytic reduction of nitrogen oxides by NH 3 . The performance of catalysts is largely affected by calcination temperature. Here, effects of calcination temperature on physicochemical property and catalytic activity of CuSO 4 /TiO 2 catalysts were investigated in depth. Catalyst samples calcined at different temperatures were prepared first and then physicochemical properties of the catalyst were characterized by N 2 adsorption-desorption, X-ray diffraction, thermogravimetric analysis , Raman spectra , Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, temperature-programmed desorption of NH 3 , temperature-programmed reduction of H 2 and in situ diffuse reflectance infrared Fourier transform spectroscopy . Results revealed that high calcination temperature had three main effects on the catalyst. First, sintering and anatase transform into rutile with increase of calcination temperature, causing a decrement of specific surface area. Second, decomposition of CuSO 4 under higher calcination temperature, resulting in disappears of Brønsted acid sites (S–OH), which had an adverse effect on surface acidity. Third, CuO from the decomposition of CuSO 4 changed surface reducibility of the catalyst and favored the process of NH 3 oxidation to nitrogen oxides (NO x ). Thus, catalytic activity of the catalyst calcined under high temperatures (≥600°C) decreased largely.
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PLoS One
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2020
·Vol. 15
·期 4
·e0231286
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IF 2.74
Chao Zeng,Mei Deng,Hao Qiao,Boming Tang,Yongjie Ding,Xuejuan Cao
The application of photocatalyst in pavements has received comprehensive attention in recent years due to its ability to decontaminate nitrogen oxides (NOx). However, it’s remarkable that NOx also accumulated extensively in parking lots. The purpose of this study is to develop a movable photocatalytic plate (remarked photocatalytic KT plates) coupled with high activity to purify NOx. Firstly, the type of photocatalytic KT plates was determined according to NO removal experiment in laboratory. Then the plates were employed in the parking lots for removing NOx. One sample T-test, normality test and paired sample T-test methods for NOx concentration variation were conducted to determine the appropriate comparative means of dates under both dark and illuminated conditions. The difference of NO X concentration between dark and illuminated conditions was obtained to evaluate the photocatalytic removal efficiency. The results indicated that NO removal efficiency in laboratory and parking lots were 51.31% and 9.2%, respectively.
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JOURNAL OF THERMAL SPRAY TECHNOLOGY
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2020
·Vol. 29
·期 5
·1172-1182
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IF 2.522
Zhai Mengjiao,Liu Yi,Huang Jing,Hou Wenjia,Wu Songze,Zhang Botao,Li Hua
Abstract A novel TiO 2 -SrCO 3 co-catalyst with a porous structure was fabricated by suspension plasma spraying. SrTiO 3 as revealed by high-resolution TEM was formed by the chemical reaction of TiO 2 with SrCO 3 during the high-temperature plasma spraying. A narrow band gap (2.58 eV) and reduction in the recombination speed of photoinduced carriers of the coatings were detected by UV–visible diffuse reflectance spectrometry and fluorescence spectrometry, respectively. The enhanced visible light-driven photodegradation properties of the coatings resulted in promoted degradation of methylene blue. The composite coatings also demonstrated significantly pronounced bactericidal activities against the Gram-negative bacterium Escherichia coli than the pure TiO 2 coatings, achieving a killing rate of over 99.7%. The results give insights on the potential to fabricate large-scale nano-TiO 2 -based porous photocatalytic coatings by suspension plasma spraying for versatile environmental applications. Graphic Abstract
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MATERIALS CHEMISTRY AND PHYSICS
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2020
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IF 3.408
Ruimin Hu,Tao Fan,Jinlong Yang,Hang Xiao,Yiping Liu,Ming Lu
Recent years have witnessed the explosive progress of functional nano materials in textile field, requires us to re-recognize and understand the potential hazards of nanoparticles . A harmless, cost-effective and facile approach of growing functional particles with special morphology and immobilizing onto cellulose fabric (CF) to prepare functional fabrics is highly desired. Here, commercial TiO 2 nanoparticles (TiO 2 NPs) grow under ultrasound-microwave and form a flake-like structure, which retain excellent photocatalytic degradation ability and prevented the potential harm to human body when nanoparticles fell off. The method was implemented based on 4-methylmorpholine-N-oxide (NMMO) aqueous system which was approved as a favorable solvent for dissolving cellulose, and grew flake-TiO 2 on cotton fibers under the assistance of the ultrasound and microwave. The as-prepared TiO 2 -CF possessed satisfactory photocatalytic activity for Methylene blue (MB) and Rhodamine B (RhB) dyes under ultraviolet light with the low dye residue rate of about 5% and 1%, respectively. After 50 times rigorous washing procedures, the titania loading next to 18% was confirmed by thermogravimetric analysis , which proved that TiO 2 -CF had good wash fastness.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2020
·Vol. 27
·期 15
·17986-17996
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IF 3.056
Wang Yanhua,Du Yingchao,Yan Jingmin,Wang Yongliang,Yu Bo,Zhang Xiaomeng,Ye Shufeng
Compared with As(V), As(III) is a tricky issue worldwide for its higher toxicity and more difficult to remove in aqueous solution. In present study, a novel CeO x /MnO y nanoparticles anchored layered structural TiO 2 pillared montmorillonite (TiO 2 -Mt-Ce-Mn) was fabricated and applied as an efficient absorbent for As(III) removal. Under the condition of the initial As(III) concentration = 20 mg/L and adsorbent dose = 0.4 g/L, TiO 2 -Mt-Ce-Mn with a high specific surface area (148.099 m 2 /g) has an outstanding adsorption capacity (46.58 mg/g) for As(III) at pH 4.2, and the effect of oxy-anions on adsorption efficiency is slight except for H 2 PO 4 − . Interestingly, the layered structure provides sufficient attachment space for CeO x /MnO y nanoparticles, while CeO x /MnO y nanoparticles in turn endows TiO 2 -Mt a high redox potential, which further facilitates the oxidation of As(III), and this significantly reduces the toxicity of wastewater. The adsorption mechanism includes the oxidation of As(III) to As(V) by both CeO x /MnO y nanoparticles and TiO 2 and effective adsorption of the residual As(III) and the formed As(V) subsequently. In addition, the adsorption efficiency of TiO 2 -Mt-Ce-Mn can still maintain 79.6% after five cycles through a facile regeneration method. Thus, the nanocomposite with low-cost synthesis process, high adsorption capacity, and regenerability is a promising candidate for As(III) treatment of wastewater.
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ADVANCED POWDER TECHNOLOGY
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2020
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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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CATALYSIS TODAY
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2020
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IF 5.825
Zhen-Hong He,Chong-Shan Jiang,Kuan Wang,Zhong-Yu Wang,Na Li,Wei-Tao Wang,Zhao-Tie Liu
Catalytic conversion of CO 2 into methanol is of particular interest as it does not only provide valuable methanol, but also utilize the waste CO 2 . In the present work, a CoO/Co/TiO 2 catalyst was developed and utilized in catalyzing CO 2 to methanol under photothermal conditions. From the results of characterization, the supported Co nanoparticles (NPs) were composed of Co 0 in the bulk, CoO film formed from air oxidation on the surface, and Co 0 at Co NPs-TiO 2 interfaces. This structure provided the possibility for a Z scheme photothermal catalytic system, which revealed a high activity for methanol formation in aqueous media under atmosphere pressure. It was proposed that the light excited electrons from the valence band (VB) of TiO 2 , and the excited electrons could enhance the Co 0 catalytic activity under thermal conditions. The present approach will offer a new strategy to design Co based Z scheme catalysts and further improve the conversion efficiency from CO 2 to fuels.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2020
·Vol. 27
·期 24
·30243-30253
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IF 3.056
Xu Wenqing,Gao Lei,Yang Yang,Zhu Tingyu,Qi Guisheng
The deposition of NH 4 HSO 4 on catalysts is one of the key issues for selective catalytic reduction of NO x . In this study, NH 4 HSO 4 was preloaded on catalysts, and the effects of MoO 3 and CeO 2 doping on the decomposition and reactivity of NH 4 HSO 4 on V 2 O 5 /TiO 2 catalysts are studied. The results show that the introduction of MoO 3 and CeO 2 significantly promoted NO x conversion on the V 2 O 5 /TiO 2 catalysts. Doping with MoO 3 could effectively enhance the S and H 2 O resistance of the catalysts. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis indicate that it is the strong chemical interactions between NH 4 HSO 4 and the catalysts that are adverse to the decomposition of NH 4 HSO 4 . However, doping with MoO 3 apparently inhibits these interactions, which significantly decrease the decomposition temperature of NH 4 HSO 4 . In situ FTIR experiments show that the NH 4 + in preloaded NH 4 HSO 4 could react with gaseous NO on catalysts, and doping with MoO 3 could facilitate the reaction rate.
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Nanomaterials
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2020
·Vol. 10
·期 5
·962
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IF 4.324
Xianwei Meng,Kailin Chi,Qian Li,Yu Cao,Gengxin Song,Bao Liu,Haibin Yang,Wuyou Fu
As one of the most frequently-used electron-transporting materials, the mesoporous titanium dioxide (m-TiO2) film used in mesoporous structured perovskite solar cells (PSCs) can be employed for the scaffold of the perovskite film and as a pathway for electron transport, and the contact area between the perovskite and m-TiO2directly determines the comprehensive performance of the PSCs. Because of the substandard interface combining quality between the all-inorganic perovskite CsPbIBr2and m-TiO2, the development of the mesoporous structured CsPbIBr2PSCs synthesized by the one-step method is severely limited. Here, we used a solution containing PbI2, monoethanolamine (EA) and dimethyl sulfoxide (DMSO) (PED) as the interfacial modifier to enhance the contact area and modify the m-TiO2/CsPbIBr2contact characteristics. Comparatively, the performance of the solar device based on the PED-modified m-TiO2layer has improved considerably, and its power conversion efficiency is up to 6.39%.Keywords:all-inorganic perovskite;CsPbIBr2;solar cell;mesoporous structure;interfacial modification
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