Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Zhengfeng Gu,Daiwei Liu,Mengnan Yu,Teng Bao,Xiaowei Liu,Ling Zhang,Haitao Ding,Zhimin Yu,Chengxun Deng
The synthesis of supported transition metal oxides with satisfactory low-temperature catalytic performance and application potential is still a challenge for the complete degradation of VOCs. Ni-Cu-loaded TiO 2 catalysts were prepared by an impregnation method. The lattice defect and oxygen vacancy concentrations of the prepared materials could be tuned by controlling the Ni/Cu molar ratio and the mass proportion of the TiO 2 support. 5Ni-Cu/TiO 2 exhibited the best catalytic activity and showed superior catalytic stability during complete toluene oxidation . The obtained catalysts were fully characterized by XRD, FT-IR, TEM, N 2 adsorption analysis, XPS, H 2 -TPR, O 2 -TPD, TPD analysis, and XPS. The 5Ni-Cu/TiO 2 catalyst had improved pore sizes and specific surface area, had more oxygen vacancies on its surface, had increased concentrations of adsorbed and lattice oxygen species, and had good redox properties; these characteristics were favorable for low-temperature catalytic performance and catalytic stability. Cyclic transformations of metal valence states between Cu + and Cu and between Ni and Ni 2+ were observed in the catalytic system. A potential catalytic reaction process based on the M-vK mechanism was proposed. This work serves as a reference for the application of supported transition metal catalysts for the degradation of VOCs.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 37
·56379-56392
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IF 5.19
Hu Ximin,Han Wenyuan,Zhang Manqi,Li Degang,Sun Hongqi
Carbon quantum dots (CQDs) can be used to modify TiO 2 to extend the light absorption threshold and enhance its photocatalytic efficiency. In this study, different amounts of CQDs modified TiO 2 (CQDs-x/TiO 2 ) were synthesized by a facile, mild, and environmental friendly hydrothermal method at a low temperature. The physicochemical properties were investigated by a variety of advanced characterization techniques. It was found that the anchoring of CQDs endowed the CQDs-x/TiO 2 with a large specific surface area, which is beneficial to adsorb more organic pollutants and promote the rate of photocatalytic oxidation. The XRD results also showed that the in situ formation of CQDs on the surface of TiO 2 made the crystallinity of TiO 2 tend to be complete. Among these photocatalysts, CQDs-20/TiO 2 showed the highest pollutant removal efficiency under visible light irradiations. The classical quenching tests revealed that the O 2 •− , • OH, and hole (h + ) were the oxidizing species. Among them, h + was the primary factor contributing to the degradation. The electrochemical tests showed that the anchoring of CQDs on TiO 2 increased the photocurrent by about four times, as compared with the pure TiO 2 . In particular, the cyclic voltammetry results showed that the photo-generated electrons of CQDs were freer to transfer to TiO 2 under visible light irradiations, promoting the separation of photo-generated electrons and holes. This study explains adequately why the CQDs/TiO 2 system has a good photocatalytic degradation of organic compounds.
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ENVIRONMENTAL ENGINEERING SCIENCE
·
2022
·Vol. 39
·期 3
·259-267
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IF 2.172
Yue Sun,Lijiang Tian,Bingkun Liu,Fulong Chen,Sijie Ge
In this article, Mn/I-TiO2 nanocatalyst was prepared by sol-gel method and used as the photocatalyst to discompose the gaseous benzene in the visible light. The crystal phase composition and grain size of the photocatalyst were investigated by X-ray diffraction and Raman, respectively. X-ray photoelectron spectroscopy and ultraviolet-visible diffuse reflectance spectroscope were used to study the surface elements and bandgap width of the photocatalyst. The research findings suggested that the crystal type of all catalysts was anatase. TiO2 nanoparticle doped by Mn/I could reduce its crystallite size and augment lattice distortion because of the formation of oxygen vacancies. The generation rate, migration rate, and disintegration rate of electron-hole pairs were increased by modification of TiO2. Meanwhile, the Mn-TiO2 was recognized with the smallest bandgap among four kinds of catalyst. Mn-TiO2 catalyst exhibited the highest efficiency on gaseous benzene removal (37.86%) among pure-TiO2 (3.33%), I-TiO2 (30.21%), and Mn-I-TiO2 (31.56%) under visible light. Correspondingly, the photocatalytic ability of pure-TiO2, I-TiO2, Mn-I-TiO2, and Mn-TiO2 was 51.25 μg C6H6/(g·h), 424.36 μg C6H6/(g·h), 493.61 μg C6H6/(g·h), and 245.43 μg C6H6/(g·h), respectively.
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ChemSusChem
·
2022
·Vol. 15
·期 14
·e202200548
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IF 9.14
Min Huang,Shuyi Zhang,Bo Wu,Xing Yu,Yongping Gan,Tiejun Lin,Fei Yu,Yuhan Sun,Liangshu Zhong
Graphical Not too radical : Low-cost and highly effective W-doped TiO 2 photocatalysts are prepared to achieve the photocatalytic oxidation of methane with O 2 under mild conditions. The increased separation of photogenerated carriers promotes the photocatalytic activity. The upshifted band structure prohibits the over-generation of hydroxyl radicals (⋅OH) to decrease the overoxidation of liquid oxygenates. Highly selective conversion of methane to oxygenates with O 2 as a green oxidant remains a great challenge. It is still difficult to suppress the generation of CO x ( x =1, 2) as undesired by-products due to unavoidable overoxidation reaction. Hence, tungsten-doped (W-doped) TiO 2 photocatalysts were designed with a tunable band structure for photocatalytic oxidation of methane to C 1 oxygenates using O 2 at low temperature (30 °C). The W-doping effectively modified the electronic and band structure of pristine TiO 2 to enhance photocatalytic performance. Liquid oxygenates productivity could reach as high as 12.2 mmol g −1 with high selectivity of 99.4 %. Moreover, CO x selectivity was effectively decreased from 21.2 % over TiO 2 to 0.6 % for W-doped catalyst. Detailed characterizations further disclosed that W-doping not only enhanced light absorption, but also promoted the separation of photo-generated carriers to improve methane conversion. This work provides new insights into the design of highly efficient photocatalysts for methane oxidation.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
·
IF 6.76
Junfeng Yang,Yuyang Wu,Yanhui Dong,Hao Cui,Chenyang Shi,Hang Sun,Shengyan Yin
Herein, a ternary Bi@H-TiO 2 /B-C 3 N 4 type II heterostructure is successfully designed and prepared via metal Bi as cocatalyst for photocatalytic H 2 generation. As expected, under λ > 300 nm light, the highest photocatalytic hydrogen production rate (HPR) of Bi@H-TiO 2 /B-C 3 N 4 is up to 223.08 μmol g −1 h −1 . Excitingly, under visible light (λ > 400 nm), the highest HPR of Bi@H-TiO 2 /B-C 3 N 4 is increased to 18.84 μmol g −1 h −1 , which is about 67.3 times, 37.7 times and 6.8 times as high as that of H-TiO 2 , B-C 3 N 4 and H-TiO 2 /B-C 3 N 4 under the same conditions, respectively. Moreover, the electrochemical impedance spectroscopy and transient photocurrent tests manifest that the interface resistance of Bi@H-TiO 2 /B-C 3 N 4 composite decreases and the photocurrent density increases after loading metal Bi. These results indicate that loading metal Bi as cocatalyst (providing more electron trapping sites) is beneficial to improve photocatalytic activity in the type II heterostructure composite. And the electron transfer directions (B-C 3 N 4 → H-TiO 2 → Bi or B-C 3 N 4 → Bi) are proved by ultraviolet photoelectron spectroscopy test. Therefore, the Bi@H-TiO 2 /B-C 3 N 4 photocatalyst with strong visible light absorption is expected to be a promising candidate in photocatalytic fields under visible light.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Fazli Wahid,Xue-Qing Zhao,Ji-Xiao Cui,Yun-Ya Wang,Feng-Ping Wang,Shi-Ru Jia,Cheng Zhong
Superhydrophilic/underwater superoleophobic (SUS) membrane technology has attracted extensive attention for water purification. However, the fabrication of multifunctional membranes to satisfy the complex wastewater treatment is still a big challenge. In this work, bacterial cellulose (BC) based multifunctional SUS membranes were designed for water purification. Membranes were prepared by blending BC nanofibers with TiO 2 nanoparticles (NPs), and further modified by the in situ growth of ZnO-NPs. The composite membranes showed oil/water (o/w) separation under a small driving pressure (0.2–0.3 bar) with a flux rate of 8232.81 ± 212 L m − 2 h −1 and with a high separation efficiency (>99.9%). Membranes could also separate oil-in-water emulsion with a separation flux of 1498 ± 74 L m − 2 h −1 and with high efficiency (99.25%). Moreover, the composite membrane exhibited photocatalytic activity under visible light with a high efficiency (>92%). The composite membranes were also investigated for antibacterial activity against Gram-positive and Gram-negative bacterial strains. This work may inspire the fabrication of next-generation multifunctional membranes for wastewater treatment, particularly oily wastewater, dyes and microbial contaminated water.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
·
IF 4.598
Jia-Yan Pu,Xiu-Tong Wang,Jing-Quan Liu,Mei-Peng Ren,You-Bo Nan,Mao-Sheng Liu,Hui Xu,Li-Hui Yang,Yan-Liang Huang,Bao-Rong Hou
Polydopamine (PDA) coating was prepared on TiO 2 nanotubes array by dip-coating method to improve the photocathodic protection performance of TiO 2 . The morphology, crystal structure, valence state and elemental composition of the PDA@TiO 2 were characterized. The electrochemical tests of open-circuit potential (OCP) and photocurrent density curves were used to characterize their photocathodic protection effects for 304 stainless steels (304SS). The result shows that the TiO 2 combined with PDA can effectively prevent the corrosion of 304SS under visible light irradiation. Moreover, through stability test and immersion test, the sample has good stability and it also has protective effect for 304SS in the dark state.
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Journal of Science-Advanced Materials and Devices
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2022
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IF 7.382
Na Wang,Renrong Zheng,Jiang Chen,Zan Ding,Haisheng San,Shaoda Zhang
Self-driven ultraviolet photodetectors based on wide-bandgap semiconductors have been well investigated but are still being explored for further performance enhancement. Here we report a self-driven electrochemical ultraviolet photodetector (EUVPD) using a three-dimensional nanostructured photoanode based on defect-engineered TiO 2 nanotube arrays (TNAs) modified with single-walled carbon nanotubes (SWCNTs) to enhance photoelectric performance. The EUVPDs based on Ar-annealed TNAs modified with 0.1 mg/mL of SWCNTs were found to have higher responsivity (∼60 mA/W), higher on/off current ratio (∼4.3 × 10 3 ), the faster response time (4 ms of rise-time and 27 ms of decay-time) when compared with unmodified and air-annealed ones. This performance enhancement is attributed to the highly efficient separation and transport of photoexcited carriers through the electrochemical redox reaction in the SWCNTs network anchored on the defect-engineered TNAs/electrolyte heterojunction nanostructure.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Xiaodong Cui,Pengcheng Li,Hua Lei,Chang Tu,Dongliang Wang,Zhu Wang,Wanping Chen
Many piezoelectric nanomaterials have recently been revealed an attractive capability to degrade organic pollutants through utilizing mechanical energy via a tribocatalytic mechanism. Presently we have explored tribocatalytic degradation of organic pollutants for TiO 2 nanoparticles. While degradation of organic dyes was observed for TiO 2 nanoparticles under ordinary magnetic stirring, the degradation was greatly enhanced when the magnetic stirring was modified through using Teflon magnetic rotating disks, which are circular Teflon disks with a cross-shaped groove on one side and magnets mounted on the other side. With TiO 2 nanoparticles under the modified magnetic stirring, as much as 99.7% of 40 mg/L Rhodamine B and 94.7% of 20 mg/L Methyl violet were degraded after 200 min, and 93.1% of 20 mg/L Methylene blue was degraded after 250 min, which are highly outstanding among catalytic dye degradations by metal oxide nanoparticles. Active radicals were detected through fluorescence spectroscopy and electron paramagnetic resonance spectroscopy for TiO 2 nanoparticles under magnetic stirring, which supports a tribocatalytic mechanism for the dye degradations. These results suggest that tribocatalysis can be an appealing technology to utilize mechanical energy for environmental remediation, especially in areas of insufficient solar energy.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhijian Wang,Lanlan Liu,Qifeng Du,RuiTao Tang,Jun Ai,Ying Chen
Ti-related oxide ceramics often exhibit excellent microwave dielectric properties and are widely applied in the microwave communication field. However, their microwave dielectric properties are often influenced by unstable defects, which are caused by the relatively low oxygen partial pressure at high sintering temperatures . In this work, Al 2 O 3 was introduced to improve the defect structures of the 0.85CeO 2 -0.15TiO 2 ceramics. According to the XPS pattern and AC conductivity analysis, Al 2 O 3 doping could stabilize the valence state of Ti but increase the oxygen vacancy concentration. Q × f first increased and then decreased as the Al 2 O 3 content increased. The highest Q × f value of 54361 GHz was obtained for the CTA0.015 sample sintered at 1275 °C, as well as the ε r of 29.41 and τ f of +7.8 ppm/°C. Finally, the CTA0.015 sample was used to prepare a microstrip antenna via the screen-printing process, which exhibited a good temperature-independent resonant frequency and indicated good application prospects.
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Coatings
·
2022
·Vol. 12
·期 1
·64
·
IF 3.236
Yuanzhi Min,Gao Song,Ling Zhou,Xinyue Wang,Pingying Liu,Jumei Li
Nanostructured noble metal-semiconductor materials have been attracting increasing attention because of their broad application in the field of environmental remediation, sensing and photocatalysis. In this study, a facile approach for fabricating silver@mesoporousanataseTiO2(Ag@mTiO2) core-shell nanoparticles employing sol-gel and hydrothermal reaction is demonstrated. The Ag@mTiO2nanoparticles display excellent surface-enhanced Raman scattering (SERS) sensitivity and they can detect the methylene blue (MB) molecules with the concentration of as low as 10−8M. They also exhibit outstanding photocatalytic activity compared with mTiO2, due to the efficient separation and recombination restrain of electron–hole pairs under ultraviolet light. The Ag@mTiO2nanoparticles also present good stability and they can achieve recyclable photocatalytic degradation experiments for five times without loss of activity. Subsequently, the nanoparticles with dual functions were successfully used to in situ monitor the photodegradation process of MB aqueous solution. These results, demonstrating the multifunctional Ag@mTiO2nanoparticles, hold promising applications for simultaneous SERS analysis and the removal of dye pollutants in environmental field.Keywords:photocatalytic degradation;surface-enhanced Raman scattering;TiO2;Ag nanoparticle;core-shell
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ACS Nano
·
2022
·
IF 18.027
Ting Wang,Liang Chen,Cong Chen,Mengtian Huang,Youju Huang,Shoujie Liu,Benxia Li
Photocatalytic CO2 conversion into a high-value-added C2 product is a highly challenging task because of insufficient electron deliverability and sluggish C–C coupling kinetics. Engineering catalytic interfaces in photocatalysts provides a promising approach to manipulate photoinduced charge carriers and create multiple catalytic sites for boosting the generation of C2 product from CO2 reduction. Herein, a Cuδ+/CeO2-TiO2 photocatalyst that contains atomically dispersed Cuδ+ sites anchored on the CeO2-TiO2 heterostructures consisting of highly dispersed CeO2 nanoparticles on porous TiO2 is designedly constructed by the pyrolytic transformation of a Cu2+-Ce3+/MIL-125-NH2 precursor. In the designed photocatalyst, TiO2 acts as a light-harvesting material for generating electron–hole pairs that are efficiently separated by CeO2-TiO2 interfaces, and the Cu–Ce dual active sites synergistically facilitate the generation and dimerization of *CO intermediates, thus lowering the energy barrier of C–C coupling. As a consequence, the Cuδ+/CeO2-TiO2 photocatalyst exhibits a production rate of 4.51 μmol–1·gcat–1·h–1 and 73.9% selectivity in terms of electron utilization for CO2 to C2H4 conversion under simulated sunlight, with H2O as hydrogen source and hole scavenger. The photocatalytic mechanism is revealed by operando spectroscopic methods as well as theoretical calculations. This study displays the rational construction of heterogeneous photocatalysts for boosting CO2 conversion and emphasizes the synergistic effect of multiple active sites in enhancing the selectivity of C2 product.
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