ACS Applied Energy Materials
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2022
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IF 6.959
Bing Ou,Yang Liu,Hao Sun,Zhenning Xing,Haipeng Di,Yingrong Jin,Yiying Zhao
Modification of the electron transport layers is extremely important for improving the efficiency and stability of perovskite solar cells (PSCs) due to its critical role in the electron extraction and crystallization of perovskite layers. Na2S has been reported as an effective dopant and a surface-modification layer as well for a compact TiO2 layer. This paper further investigated the distribution and the working mechanism of sulfur ions via comparing the properties of Na2S-doped and Na2S-coated TiO2 layers and the corresponding devices. A simple deionized-water rinsing process was introduced for its removal capability of Na and S elements in compacted TiO2 layers. From the characterization results of TiO2 layers after rinsing and corresponding PSCs, we can draw the conclusion that Na+ and S2– are mainly located on the TiO2 surface and grain boundaries in the TiO2 layers, and only a very small amount of S elements participates in the bonding with the TiO2 crystal lattice of the Na2S-doped TiO2 layers. This work provides some insights on the understanding of the mechanism of S2– passivation in PSCs and may stimulate further investigation on defect passivation in the perovskite research community.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2022
·Vol. 98
·期 2
·506-515
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IF 3.709
Cao Shuang,Zhang Haixiang,Wang Xueman,Peng Miquan,Huang Renhua,Hong Wei,Fu Hailu,Chen Xiongbo,Lin Zejian
In SCR denitrification technology, the conventional coprecipitation method has the disadvantages of high temperature and difficulty in controlling the precipitation rate. Various Ce x CuTiO 2 catalysts were synthesized using ice-melting (Ce x CuTi-Ice) and conventional coprecipitation (Ce x CuTi-Con) methods for the selective catalytic reduction (SCR) of NO with NH 3 . Ce 0.4 CuTi-Ice catalyst exhibited excellent catalytic activity among the Ce x CuTiO 2 catalysts, and 80% NO x conversion was achieved within a temperature range of 250–375 °C, exceeding that of Ce 0.4 CuTi-Con catalyst by 20%; in addition, N 2 selectivity was nearly 100%. To elucidate the release characteristics of the precursor solution during ice-melting synthesis, the changes of Cu and Ce concentrations in the solution were investigated by ICP-OES. The precursor solution was released at a slow rate via the ice-melting method, resulting in a large surface area, small crystallite sizes, and effective uniform nanoparticles with abundant active species and increased surface acidity. The promoted mechanism could be attributed to the enhanced oxidation of NO to NO 2 at low temperatures and the rapid reaction between NO species and coordinated NH 3 at high temperatures. © 2022 Society of Chemical Industry (SCI).
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COLLOID AND POLYMER SCIENCE
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2022
·Vol. 301
·期 1
·1-10
·
IF 2.434
Zhao Si,Lv Zaosheng,Lei Yang,Huang Yanfen
Various methods have been exploited to treat oil/water mixtures, but they are not suitable for widespread application due to high cost or low efficiency. Superhydrophobic materials with water-repellent and lipophilic are desirable materials for the separation. Here, composite superhydrophobic coatings, capable of applying to a variety of substrates, were developed using a simple co-blending method of dispersing fumed TiO 2 nanoparticles (NPs) and hydrophobic silica sol into non-fluorinated modified polystyrene resin (MPS). The properties of the coating were investigated by a variety of techniques such as FTIR, FESEM, TG-DSC, and contact angle measurement. The results suggested that the surface had exceptional superhydrophobicity with the WCA as high as 160.8°. The coating remained superhydrophobic after 3 times of sandpaper abrasion. The superhydrophobic surface had excellent self-cleaning properties and could be applied to separate the oil/water mixture. The separation efficiency could be over 96% and remained stable after 5 cycles. It is a great prospect in the treatment of oily wastewater. Furthermore, the reagents and instruments used during the procedure are easily available, so it has the potential for production in large quantities. Graphical abstract The superhydrophobic composite coatings for self-cleaning were fabricated by mixing the non-fluorinated modified polystyrene resin (MPS) and two nanoparticles of TiO2 and SiO2. The superhydrophobic composite coatings could be applied to separate the oil/water mixture. The separation efficiency could be over 96%, and remained stable after 5 cycles.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yu Zhu,Qinyun Xv,Dan Wang,Bingxin Sun,Yujia Wang,Zhiguo Han,Yongbo Gou,Jiayu Liu,Bingdong Li
The overuse of norfloxacin (NOR) has attracted wide attention because of the persistence and bio-accumulate in ecosystems and the negative impacts on human health. To solve the environmental issue, BiOI/TiO 2 p-n heterojunctions have been developed and decorated with a porous ZIF-8 to obtain novel hollow BiOI/TiO 2 /ZIF-8 heterojunctions, which were further characterized by XRD, SEM, HRTEM , XPS , BET, UV–vis DRS, photoluminescence , ESR , photocurrent and EIS analyses. The BiOI/TiO 2 /ZIF-8 heterojunctions exhibited evidently improved photocatalytic performance compared with pristine BiOI , TiO 2 and BiOI/TiO 2 composites under visible light irradiation. ZIF-8 plays a key role in both the enhancement of adsorption and the photocatalytic activity in NOR removal. ·O 2 - and ·OH radicals were the two dominating active species in the photocatalytic process according to the trapping experiments. In 2-BTZ system, large specific surface area, highly effective charge carrier migration with inhibiting recombination, more negative CB and positive VB to generate more active ·O 2 - and ·OH species resulted in superior photocatalytic activity. This work provides a new idea to design a kind of photocatalytic heterostructure with more active species for potential application in the field of environmental treatment.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Shaodi Sun,Xiaomin Wu,Zhiwei Huang,Huazheng Shen,Huawang Zhao,Guohua Jing
The strong metal-support interaction (SMSI) has received wide attention in heterogeneous catalysis for the room-temperature oxidation of formaldehyde. An interaction between Pt nanoclusters and oxygen vacancy defects will lead to SMSI over the Pt-based catalysts. In this study, defective two-dimensional (2D) TiO 2 nanosheets were synthesized and successfully anchored Pt nanoclusters with a size of 1.3 nm (0.1Pt/TiO 2 -NS). The 0.1Pt/TiO 2 -NS catalyst displayed a superior activity of > 95% HCHO conversion at room temperature, which was ∼ 50% higher than that obtained for a counterpart having the commercial TiO 2 (Degussa P25) support. The abundant oxygen vacancies and stable Pt nanoclusters on 0.1Pt/TiO 2 -NS by introducing SMSI boosted the excellent activity and stability of HCHO oxidation. By exploring electron transfer, suppression of small-molecule adsorption and encapsulation, SMSI was well demonstrated. Furthermore, electron transfer from Pt to TiO 2 -NS led to the electron-deficient Pt surface. The electron-deficient Pt caused by SMSI will enhance the adsorptions of HCHO and H 2 O/O 2 , subsequently improving the catalytic performance. SMSI between Pt nanoclusters and oxygen vacancies endowed the 0.1Pt/TiO 2 -NS catalyst excellent activity and stability to HCHO elimination. In addition, the mechanism for the high HCHO oxidation performance were examined through analysis of in situ HCHO-diffuse reflectance infrared Fourier transform spectra (DRIFTS).
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Journal of Materials Chemistry A
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2022
·Vol. 10
·期 10
·5505-5519
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IF 14.511
Xu Tian,Lijia Yao,Xiuxiu Cui,Rongjun Zhao,Ting Chen,Xuechun Xiao,Yude Wang
Two-dimensional nanomaterials have exhibited considerable potential for gas sensing applications in recent years owing to their unique physical and chemical properties such as a large surface-to-volume ratio, abundant edge sites, versatile surface chemistry, etc. Herein, we demonstrate a two-dimensional Ti3C2TX MXene@TiO2/MoS2 nanocomposite gas sensor for ammonia detection at room temperature. MoS2 nanosheets are grown on an etched Ti3C2TX MXene surface by a hydrothermal method, and rectangular TiO2 particles are derived from Ti3C2TX MXene in the hydrothermal process. Meanwhile, nanocomposites with different Ti3C2TX MXene additions are also designed for gas sensing performance comparison. Such a novel hierarchical structure based gas sensor (MTM-0.2 sensor) exhibits fast response/recovery time and excellent long-term stability to ammonia. Meanwhile, outstanding selectivity to ammonia against triethylamine, trimethylamine, n-butanol, acetone, formaldehyde, and nitrogen dioxide at room temperature is also shown. The sensor shows 1.79-fold and 2.75-fold enhancement in the gas sensing response toward 100 ppm ammonia compared with the pristine Ti3C2TX MXene and MoS2 gas sensors, respectively. And its detection limit for ammonia is 500 ppb. The sensing mechanisms of the Ti3C2TX MXene@TiO2/MoS2 nanocomposites toward ammonia are attributed to the layered nanostructure, p–n heterojunction created at the interface of p-type Ti3C2TX MXene and n-type MoS2. Finally, density-functional theory (DFT) is performed to investigate the adsorption behavior and charge transfer of ammonia molecules on the surface of the nanocomposite. The synthesized Ti3C2TX MXene@TiO2/MoS2 nanocomposite can be regarded as a promising candidate for high-performance ammonia detection at room temperature.
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ELECTROCHEMISTRY COMMUNICATIONS
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2022
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IF 5.443
Zixue Su,Hui Li
This work reports an electrochemical synthesis of (NH 4 ) 3 TiOF 5 mesocrystals consisting of nanocrystalline building units, via oriented particle attachment driven by an external electric field. The obtained (NH 4 ) 3 TiOF 5 mesocrystals are octahedral in shape and can be converted to porous anatase TiO 2 , retaining their octahedral morphology after thermal annealing treatment. A distinctive evolution process for the (NH 4 ) 3 TiOF 5 mesocrystals with octahedral morphology is revealed, which includes the nucleation and growth of primary small octahedral particles, oriented aggregation of six primary octahedral particles into one large secondary particle, formation of mesocrystalline octahedrons by crystallographic fusion, dissolution of the octahedrons into small nanoparticles, followed by oriented aggregation of the dissolved nanoparticles to form micrometer-sized octahedrons. The alignment and subsequent oriented attachment of nanoparticles driven by an external electric field enable the rapid growth of (NH 4 ) 3 TiOF 5 mesocrystals within 40 s, compared with the tens of hours usually required for the growth of NH 4 TiOF 3 mesocrystals using a hydrothermal method.
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LANGMUIR
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2022
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IF 4.331
Qiangtao Zhu,Dongyu Pan,Yangyi Sun,Dongming Qi
Hollow structures in TiO2 materials can enhance the photocatalytic properties by reducing the diffusion length and improving the accessibility of active sites for the reactants. However, existing approaches for preparing hollow TiO2 materials have two drawbacks that restrict their engineering applicability: first, a heavy reliance on templates to form a hollow structure, which makes the preparation laborious, complicated, and costly; second, difficult-to-achieve high crystallization while maintaining the small grain size in calcinated TiO2, which is crucial for enhancing photocatalytic activity. Herein, a simple, effective method is proposed that not only enables the preparation of hybrid TiO2–SiO2 hollow spheres without the template fabrication and removal process via microemulsion technology but also achieves both high crystallization and a small grain size in calcinated TiO2 at once through the calcination of amorphous TiO2 with organosilane at a high temperature of 850 °C. The prepared TiO2–SiO2 hollow spheres with tunable sizes demonstrate high photocatalytic activity with a maximum k value of 133.74 × 10–3 min–1, which is superior to commercial photocatalyst P25 (k = 114.97 × 10–3 min–1). In addition, Au can be doped in the hybrid TiO2–SiO2 shell to gain Au-doped hollow spheres that show a high k value of up to 694.14 × 10–3 min–1, which is 6 times larger than that of P25 and much better than that reported in the literature. This study not only provides an effective approach to stabilize and tune the grain growth of the TiO2 photocatalyst during calcination but also enables the simple preparation of hollow TiO2-based materials with controllable hollow nanostructures.
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高影响因子
RSC Advances
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2022
·Vol. 12
·期 17
·10258-10266
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IF 4.036
Jing Liu,Jinxiao Zheng,Guichu Yue,Huaike Li,Zhaoyue Liu,Yong Zhao,Nü Wang,Chenghua Sun,Zhimin Cui
TiO2/g-C3N4 composite photocatalysts with various merits, including low-cost, non-toxic, and environment friendliness, have potential application for producing clean energy and removing organic pollutants to deal with the global energy shortage and environmental contamination. Coating a continuous g-C3N4 layer on TiO2 fibers to form a core/shell structure that could improve the separation and transit efficiency of photo-induced carriers in photocatalytic reactions is still a challenge. In this work, porous TiO2 (P-TiO2)@g-C3N4 fibers were prepared by a hard template-assisted electrospinning method together with the g-C3N4 precursor in an immersing and calcination process. The continuous g-C3N4 layer was fully packed around the P-TiO2 fibers tightly to form a TiO2@g-C3N4 core/shell composite with a strong TiO2/g-C3N4 heterojunction, which greatly enhanced the separation efficiency of photo-induced electrons and holes. Moreover, the great length–diameter ratio configuration of the fiber catalyst was favorable for the recycling of the catalyst. The P-TiO2@g-C3N4 core/shell composite exhibited a significantly enhanced photocatalytic performance both in H2 generation and dye degradation reactions under visible light irradiation, owing to the specific P-TiO2@g-C3N4 core/shell structure and the high-quality TiO2/g-C3N4 heterojunction in the photocatalyst. This work offers a promising strategy to produce photocatalysts with high efficiency in visible light through a rational structure design.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2022
·Vol. 102
·期 11
·4589-4598
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IF 4.125
Wenshuo Zhang,Xiaojie Liu,Shibo Qiu,Lin Chen,Xinghai Liu
BACKGROUND A shelf-life that is too short is the main problem with strawberries. Nano-TiO 2 can catalyze and oxidize ethylene under ultraviolet (UV) light irradiation to eliminate its ripening effect on fruits and prolong the freshness period. RESULTS In this work, nano-TiO 2 modified by methacryloxy propyl trimethoxyl silane (KH570) was blended with low-density polyethylene (LDPE) to prepare modified atmosphere packaging (MAP), and the influence of TiO 2 content on films was analyzed before and after UV treatment. The results show that the modified nano-TiO 2 (M-TiO 2 ) can be uniformly distributed in LDPE, improving its mechanical strength, hydrophobicity, oxygen barrier and UV shielding properties. A modified atmosphere with low ethylene, low O 2 and high CO 2 can be created to inhibit the ripening and spoilage of strawberries. The weight loss rate of fruit can be effectively reduced. The tendency of fruit firmness decline and nutrient loss can be slowed and stabilized, contributing to controllable shelf-life. Excellent freshness preservation function can be realized without special UV treatment. CONCLUSION Since UV treatment is rare in actual storage and transportation, LDPE/M-TiO 2 composite film has practical value as MAP for strawberry and similar non-climacteric fruits. © 2022 Society of Chemical Industry.
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DIAMOND AND RELATED MATERIALS
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2022
·
IF 3.806
Shen Shen,Kunlin Chen,Hongbo Wang,Jiajia Fu
Element decomposition is a promising modification technique for enhancing the photocatalytic activity of TiO 2 . Firstly, (i) It may accelerate photogenerated electron–hole separation as electron traps , (ii) broaden the sunlight absorption region into the visible range and promote surface electron excitation by plasmon resonances excited under visible light and (iii) modify the surface performance of semiconductors. Herein, we describe the introduction of carbon dots (CDs) as solid-state electron mediator on TiO 2 sheets (TNs) via a highly effective hydrothermal process. The as-prepared CDs/TNs nanocomposites was measured by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy , UV–visible diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy analysis. The results proved that CDs were firmly scattered in the TNs interface. Furthermore, the resultant CDs/TNs nanocomposites exhibited remarkable photocatalytic activity for the degradation of different model pollutants under visible light, which is considerably superior to that of bare TNs. The enhanced photocatalytic activity highlights that CDs can promote the separation and migration efficiency of photoexcited electron–hole pairs. The striking stability of CDs/TNs was investigated by performing five successive cycles of degradation of Congo red. Moreover, the degradation intermediates of three pollutants were monitored by liquid chromatography-tandem mass spectrometry, and potential removal pathways are proposed. We firmly believe that this work may inspire new insights and approaches for the design of highly efficient photocatalysts .
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Nanomaterials
·
2022
·Vol. 12
·期 9
·1474
·
IF 5.719
Zhenzi Li,Decai Yang,Hongqi Chu,Liping Guo,Tao Chen,Yifan Mu,Xiangyi He,Xueyan Zhong,Baoxia Huang,Shiyu Zhang,Yue Gao,Yuxiu Wei,Shijie Wang,Wei Zhou
Interface engineering is usually considered to be an efficient strategy to promote the separation and migration of photoexcited electron-hole pairs and improve photocatalytic performance. Herein, reduced graphene oxide/mesoporous titanium dioxide nanotube heterojunction assemblies (rGO/TiO2) are fabricated via a facile hydrothermal method. The rGO is anchored on the surface of TiO2nanosheet assembled nanotubes in a tightly manner due to the laminated effect, in which the formed heterojunction interface becomes efficient charge transfer channels to boost the photocatalytic performance. The resultant rGO/TiO2heterojunction assemblies extend the photoresponse to the visible light region and exhibit an excellent photocatalytic hydrogen production rate of 932.9 μmol h−1g−1under simulated sunlight (AM 1.5G), which is much higher than that of pristine TiO2nanotubes (768.4 μmol h−1g−1). The enhancement can be ascribed to the formation of a heterojunction assembly, establishing effective charge transfer channels and favoring spatial charge separation, the introduced rGO acting as an electron acceptor and the two-dimensional mesoporous nanosheets structure supplying a large surface area and adequate surface active sites. This heterojunction assembly will have potential applications in energy fields.Keywords:TiO2;photocatalysis;mesoporous structure;assembly;heterojunction
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