MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Ning Zhang,Xiaofeng Ning,Jia Chen,Jianming Xue,Gongxuan Lu,Hongdeng Qiu
The development of TiO 2 -based composites with a broad light response and outstanding photocatalytic performance is very important for the removal of antibiotics. In this work, we prepared a series of new porous graphene (PG)/TiO 2 nanocomposites formed the different highly reactive interface within confined space via a partial combustion strategy using TiCl 4 as the Ti source. The as-prepared PG/TiO 2 exhibited the simultaneous effect of incredible adsorptivity and photodegradation performance toward tetracycline (TC) antibiotic under UV and visible light in contrast to conventional PG/TiO 2 , pure TiO 2 (P25) and PG. Optimization experiments showed that PG/TiO 2 -4% had the optimal removal performance among all the nanocomposites. The removal rate of TC reached up to 95.5%, which was 15% higher than that of I-PG/TiO 2 and 25% higher than that of P25 within 90 min. The results were credited to (1) the high specific surface area and porous structure of PG, (2) the broad light response range and rapid separation of h + and e − of PG/TiO 2 , and (3) the highly reactive interface between PG and TiO 2 nanoparticles . In addition, active radical trapping experiments indicated that ·O 2 − was crucial to the elimination of TC. This work showed the new potential of PG/TiO 2 nanocomposites for the enhanced photocatalytic performance.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
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IF 4.598
Jiawen Wu,Panpan Ou,Yu Lin,Xuecai Tan,Fucun Wei,Yan Mi,Shaogang Liu,Kejing Huang
Due to the environmental pollution and food safety problems that caused by the abuse of chlorpyrifos (CPF), a strategy of which is detected with high efficiency is urgently demanded. Herein, a photoelectrochemical sensor which using TiO 2 nanotube arrays with oxygen vacancies (V o -TNTAs) as electrode was constructed. Oxygen vacancies are introduced into TNTAs in order to generate a new defect level that narrows its band gap. The bismuth sulfide nanoparticles are loaded on V o -TNTAs to accelerate the separation of electron-hole pairs. Thus, the Bi 2 S 3 /V o -TNTAs hetero-structure is designed and constructed. With the existence of CPF, a complex which composed by Bi ions and CPF will be formed in situ to block the electrons transfer from electron donor (ascorbic acid) to Bi 2 S 3 , causing the weakened photocurrent. Consequently, the Bi 2 S 3 /V o -TNTAs electrode possess higher photocurrent response than that of pure V o -TNTAs and TNTAs. The Bi 2 S 3 /V o -TNTAs-based PEC sensor displays a linear range of 0.07–3.0 μmol/L with a detection limit of 6.0 nmol/L (S/N = 3) and can be utilized for CPF detection in lettuce and cucumber samples with recoveries of 95.7 to 110 %.
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Materials Today Sustainability
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2022
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IF 7.244
L. Zou,S. Li,L. Li,W. Ji,Y. Li,X. Cheng
Thermal energy storage (TES) can effectively alleviate human dependence on non-renewable energy. In this work, the phase change microcapsules with hydroxyl-rich TiO 2 as shell were first prepared by sol-gel and emulsion method, and a bendable film was prepared by embedding TiO 2 -shell phase change microcapsules (mPCMs) through hydrogen bond between poly(vinylidene fluoride) (PVDF) molecules and hydroxyl groups of TiO 2 . The results showed that TiO 2 -mPCMs can be uniformly embedded in the PVDF molecules by hydrogen bonding and the film is still bendable. The prepared film had a thermal conductivity of 0.09 W·m − 1 K − 1 and latent heat of 41.18 J/g. Besides, photothermal experiments showed that it can effectively slow down the temperature rise and storage the thermal energy induced by sunlight. This research may expand the utilization of phase change materials (PCM) in the field of heat insulation and preservation.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
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IF 4.326
Xiaoya Liu,Ying Liu,Jingchao Wang,Jinghuan Ma
A safe, efficient, and responsive online hydrogen source is critical for the commercial application of proton exchange membrane fuel cells (PEMFCs). Catalysts play an important role in accelerating the development of hydrous hydrazine as a promising online hydrogen source, and the development of hydrous hydrazine (N2H4·H2O) as a promising online hydrogen source for PEMFCs requires superior catalysts with low cost and high activity. Herein, we report the synthesis of a supported amorphous catalyst NiMo/TiO2 using a combination of impregnation and coreduction methods. The NiMo/TiO2 catalyst can be responsive and completely decompose hydrous hydrazine to produce hydrogen in 1.5 min with a H2 selectivity of 100% and a turnover frequency (TOF) value of 484 h–1 under alkaline conditions at 343 K, outperforming most non-noble metal catalysts. Moreover, H2 selectivity has no decline after 10 cycles. The excellent catalytic properties can be attributed to the strong synergistic interaction between the support TiO2 and NiMo nanoparticles, as well as the amorphous NiMo nanoparticles possessing a high concentration of coordinated unsaturated sites. In addition, the doping of Mo leads to the modification of the electronic and geometric structures of the NiMo/TiO2 surface, which results in an easier cleavage of the N–H bond and desorption of reaction intermediates.
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ACS Omega
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2022
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IF 4.132
Zhiwei He,Hanqing Wu,Zhen Shi,Zhe Kong,Shiyu Ma,Yuping Sun,Xianguo Liu
Oily wastewater and oil spills pose a threat to the environment and human health, and porous sponge materials are highly desired for oil/water separation. Herein, we design a new superhydrophobic/superoleophilic TiO2-decorated polyvinyl alcohol (PVA) sponge material for efficient oil/water separation. The TiO2–PVA sponge is obtained by firmly anchoring TiO2 nanoparticles onto the skeleton surface of pristine PVA sponge via the cross-linking reactions between TiO2 nanoparticles and H3BO3 and KH550, followed by the chemical modification of 1H,1H,2H,2H-perfluorodecyltrichlorosilane. The as-prepared TiO2–PVA sponge shows a high water contact angle of 157° (a sliding angle of 5.5°) and an oil contact angle of ∼0°, showing excellent superhydrophobicity and superoleophilicity. The TiO2–PVA sponge exhibits excellent chemical stability, thermal stability, and mechanical durability in terms of immersing it in the corrosive solutions and solvents, boiling it in water, and the sandpaper abrasion test. Moreover, the as-prepared TiO2–PVA sponge possesses excellent absorption capacity of oils or organic solvents ranging from 4.3 to 13.6 times its own weight. More importantly, the as-prepared TiO2–PVA sponge can separate carbon tetrachloride from the oil–water mixture with a separation efficiency of 97.8% with the aid of gravity and maintains a separation efficiency of 96.5% even after 15 cyclic oil/water separation processes. Therefore, the rationally designed superhydrophobic/superoleophilic TiO2–PVA sponge shows great potential in practical applications of dealing with oily wastewater and oil spills.
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PubMed
高影响因子
CATALYSIS TODAY
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2022
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IF 6.562
Yunfei Ma,Wenhui Yue,Zehong Xu,Ziwei Ye,Jinlong Zhang
Composite nanoparticles consisting upconversion nanoparticles (β-NaYF 4 :Yb/Er) and nitrogen doped TiO 2 nanoparticles were constructed via a chemical assembly method. Efficient energy transfer was enabled since the upconverted energy matched up with the band gap of N-TiO 2 . This enables the resulting composite nanoparticles to possess excellent Rhodamine B (RhB) degradation activity under near infrared (NIR) light irradiation.
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Catalysis Science & Technology
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2022
·Vol. 12
·期 4
·1245-1256
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IF 6.177
Jie Yang,Shan Ren,Mingming Wang,Zhichao Chen,Lin Chen,Lian Liu
Ce–Ti catalysts were considered as a promising replacement for V–Ti based catalysts for selective catalytic reduction (SCR) of nitrogen oxides (NO and NO2) with NH3. In this work, a CeO2/TiO2 catalyst was prepared by the impregnation method and studied by a series of in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) experiments. The results showed that CeO2 particles grew along TiO2 faces and amorphous cerium in the lattice of TiO2, both of which are present on the CeO2/TiO2 catalyst. NH4+ might adsorb on the Ti–O–Ce structures or TiO2–CeO2 interface as Brønsted acid sites, while two types of NH4+ species were distinguished by the time-resolved spectroscopic method due to the different increasing trends. Based on the temporal evolution transient in situ DRIFTS spectra, L-NH3 had higher activity than coordinated NH3 species, which suggested that gas phase NO reacted preferentially with L-NH3. The NH4NO3 intermediate dominated the SCR reactions over the CeO2/TiO2 catalyst, which followed the Eley–Rideal mechanism.
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CERAMICS INTERNATIONAL
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2023
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IF 5.2
Weichao Wang,Gu Liu,Liuying Wang,Chaoqun Ge,Long Wang,Bin Wang,Jie Huang
The advancement of absorption materials and coating preparation technology is crucial to address the challenges posed by electromagnetic interference and pollution in high-temperature extreme environments. Here, by using a granulation and plasma spraying strategy, we successfully fabricated a series of La 0.8 Sr 0.2 MnO 3 /Al 2 O 3 –13%TiO 2 (LSMO/AT13) high-temperature microwave absorption coatings that have excellent dielectric properties and extremely thermal stability. The results showed that the LSMO/AT13 coatings exhibited remarkable oxidation resistance , withstanding high-temperature aerobic environments of up to 1000 °C. Based on the temperature-dependent permittivity of the coatings, the establishment process of polarization and the transformation of loss mechanism were observed and explained. With the increase of temperature, the main dielectric loss mechanism of the coatings transitions from polarization loss to conductive loss. Thanks to the coordinated effects of impedance and loss, the coatings are capable of effectively absorbing microwave over a wide temperature range. When the LSMO content was 30 wt% and the thickness was 1.9 mm, the effective bandwidth ranged from 1.7 GHz to 2.4 GHz at temperatures below 773 K. This study demonstrates the promising application of LSMO/AT13 microwave absorption coatings for ultra-high temperature environment, and provides a reference for the design and optimization of high-temperature microwave absorption coatings.
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CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
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2023
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IF 2.2
Hongye Bai,Lihao Yu,Jinfu Xu,Xuliang Pang,Yajie Bai,Jianguo Cui,Weiqiang Fan
Decoration of metal-organic framework (MOF) has been considered as an effective route to improve the photoelectrochemical (PEC) performance of TiO 2 , but there is still a lack of understanding of the regulatory structure. Herein, Ni-MOF was rationally introduced by in-situ etching method, which helps for artificially regulating the coordination state of Ni sites. The photocurrent density (0.81 mA/cm 2 ) and IPCE value (33.1%) of TiO 2 -MOF-2 are about twice higher than that of pristine TiO 2 due to the rich unsaturated sites of Ni-MOF. Meanwhile, the saturated coordination has caused the decline of PEC performance because of the obvious steric hindrance . Therefore, this work presents an insight for the effect of coordination state on PEC activity especially in MOF system.
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Molecular Catalysis
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2023
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IF 4.6
Xiqiang Tian,Yanping Dong,Muhammad Zahid
Herein, WN-TiO 2 with evenly distributed WN nanoparticles (NPs) were facilely synthesized thru one pot evaporation-induced self-assembly (EISA) and nitridation treatment method, as an active host material for precious Pt NPs. A number of characterization techniques were executed to explore the influence of the synthetic approach upon the surface and catalytic properties of the as-synthesized 2wt%Pt/TiO 2 and 2wt%Pt/WN-TiO 2 catalysts. As compared to 2wt%Pt/TiO 2 , the 2wt%Pt/WN-TiO 2 catalyst exhibited outstanding performance in the selective hydrogenation reaction of Furfural (FAL) to Furfuryl alcohols (FOL) (conversion (97.8%) and selectivity (98.6%)). The 2wt%Pt/WN-TiO 2 catalyst also exhibited an impressive recyclability performance for up to five recycles without significant deactivation in activity and selectivity. The superior catalytic hydrogenation performance can be ascribed to the specific nanostructure characteristics of the catalyst arose from the possible synergistic effect occurred between Pt and WN species of 2wt%Pt/WN-TiO 2 . Besides, the improved homogeneous dispersion of precious Pt NPs causes more exposed active sites of Pt 0 species on the surface of 2wt%Pt/WN-TiO 2 , which is very beneficial for the improved hydrogenation of FAL to FOL.
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ACS Omega
·
2023
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IF 4.1
Miaogen Chen,Wenya Chang,Jing Zhang,Wan Zhao,Zhi Chen
Water pollution caused by antibiotics is a growing problem. Semiconductor photocatalysis is an environmentally friendly technology that can effectively degrade organic pollutants in water. Therefore, the development of efficient photocatalysts is of great significance to solve the environmental pollution problem. In this paper, mixed-phase TiO2 and 1T/2H-MoS2 composite (1T/2H-MoS2/TiO2) were synthesized by the in situ growth method. The prepared compounds were characterized and applied to the visible-light degradation of tetracycline hydrochloride. The photocatalytic effect of 1T/2H-MoS2/TiO2 on tetracycline hydrochloride is significantly enhanced under visible light and has good stability. It has potential applications in the treatment of organic pollutants in water.
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PubMed
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Jin Zhang,Suyan Li,Xiaoyu Hu,Lijun Zhang,Yu Chen,Manman Mu,Yadong Bi
It has been a blind spot to compare the modification effect of ester and acid on inorganic photo catalysts. Traditional method is always laborious to realize organic-inorganic combination by the esterification of carboxylic acids with surficial hydroxyls of nano-TiO 2 . Here, a detailed comparison was conducted using m -dipyridyl benzene skeleton (MPB) molecules containing ester or carboxylic acid groups to modify TiO 2 surface with solvothermal method . The result shows that the modification did not affect the crystal structure of TiO 2 , but formed uniformly distributed organic/inorganic binding sites and non-binding sites on its surface, thus the intrinsic UV response activity of TiO 2 can be retained. Combining with the visible light activity of organic/inorganic binding sites, a perfect photogenerated charge transfer system with matching energy levels is constructed, hence the photocatalytic performance is greatly improved. By contrast, the ester derivative of MPB (shorted as EPB) is easier to form stable organic species on the surface of nanoparticles and shows higher catalytic activity than the carboxylic acid derivative of MPB (shorted as APB), thus the study first demonstrated that the low cost and applicable photocatalyst can be obtained with much low dosage of organic modifiers containing ester groups, hence much significant in the design and optimization of catalyst surface. Compared with other reported methods, this modification has the advantages of simple process, low cost, no consumption of precious metals , ease of obtaining high activive and stable catalysts, so it is more prospective in waste water treatment.
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