CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Lijia Huang,Yi Yuan,Yuan Wang,Murat Yılmaz,Tian C. Zhang,Shaojun Yuan
Hydrogen sulfide (H 2 S), a highly toxic, malodorous, and corrosive gas, poses a serious threat to the atmospheric environment and human health. It is highly attractive to design high-performance desulfurization photocatalyst in environmental remediation. Herein, a novel and highly efficient photocatalyst boron-doped TiO 2 combined with MgAl-Layered double hydroxides (B-TiO 2 /LDH) was synthesized via an in-situ hydrothermal method. The B-TiO 2 /LDH photocatalyst exhibited outstanding photocatalytic performance with 100% H 2 S removal efficiency within 120 min under visible light irradiation. The B-TiO 2 /LDH photocatalyst also exhibits a good H 2 S removal efficiency in different desulfurization conditions and delivers remarkable stability in a long-term test. The sulfate formed on the surface of B-TiO 2 /LDH has been shown to favor the light-enhanced catalytic oxidation process. This work provides a promising idea for effectively treating malodorous gas and shows potential of using the novel B-TiO 2 /LDH photocatalyst for future environmental remediation.
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ACS Sustainable Chemistry & Engineering
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2022
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IF 9.224
Zhengfeng Wang,Xinyi Dai,Haijun Chen,Fuzhong Wu,Yi Mai,Shuie Li,Yijing Gu,Jingze Li,Aijun Zhou
The surface and interface stability of the electrode is an important factor affecting the electrochemical performance of the battery, and surface modification is an effective means to stabilize the electrode surface interface. In this paper, a TiO2–LiF composite coating layer with very stable chemical properties on the LiCoO2 (LCO) surface is prepared in one step. At the same time, surface doping is realized, which provided a stable surface structure for LCO and stabilized the interface between the electrode and electrolyte. Electrochemical test results show that in the range of 3–4.5 V, the capacity retention rate of the sample with a coating amount of 1% is 97.4% after 110 cycles at 0.2 C and a discharge capacity of 151.5 mAh g–1 at 5 C, while the bare electrode is only 67% (110th cycle) and 50.7 mAh g–1 under the same conditions. Even at 0.5 C within 3–4.6 V, the capacity retention rate of the coated sample is still as high as 88.6% after 100 cycles, showing excellent high-voltage cycle stability. Studies such as cyclic voltammetry and electrochemical impedance spectroscopy show that the improvement in electrochemical performance is due to the coating layer effectively stabilizing the LCO surface composition and structure, alleviating the structural degradation of LCO, and optimizing the lithium-ion transport channel.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Kai Chen,Xiaoya Zhou,Dan Wang,Jiawei Li,Dongming Qi
TiO 2 with biocompatibility and low price was limited application in cosmetics due to its narrow UV protection range, producing free radicals under UV irradiation to accelerated skin aging and whitish. Herein, a series of highly effective broad-spectrum TiO 2 @lignin sunscreen microscopes (TWLx) were prepared by modulating van der Waals forces and hydrogen bonding interactions between TiO 2 and lignin. The results showed that the UV main absorption peak of TWLx increased from UVA to UVA + UVB. TWLx could completely eliminate the hydroxyl radical produced by TiO 2 under UV irradiation owe to introduction of lignin. Meanwhile, the combination of TiO 2 and lignin could neutralize color, which made TWLx color closer to human skin. The UV-protection test showed that the SPF value of sunscreen containing 3 wt% TWLx reached 137.4. The antioxidant experiment showed that TWLx has about 16 times the DPPH radical scavenging ability of TiO 2 . Finally, high internal phase Pickering emulsions were prepared by using TWLx as a stabilizer. It was found that the internal phase volume fraction of the emulsion was up to 86 vol%, which could be recognized as the highest internal phase reported in suntan lotion. This work would provide new ideas for the synthesis of highly effective broad-spectrum sunscreens.
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APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Jianhui Zhu,Linchao Zeng,Xiaoya Li,Ning Zhao,Yanyi Wang,Zhilan Lin,Tingshu He,Libo Deng,Peixin Zhang
The inexpensive room-temperature sodium-sulfur (RT Na-S) battery has attracted extensive attention due to its various potential application but is still suffering from the low utilization of sulfur, the shuttle effect and the sluggish reaction activity of sodium polysulfides (SPSs). In this work, a TiO 2 /sulfur/atomic-iron loaded carbon nanosheet cathode is designed for high performance RT Na-S battery. When the atomic iron exists, a much higher electrochemical activity of sulfur was obtained, indicating the atomic iron can accelerate the conversion of SPSs. Furthermore, the TiO 2 layer can inhibit the shuttle effect of SPSs and the side-reaction between the intermediates and carbonate electrolyte. As a result, the constructed sulfur cathode exhibits a high reversible capacity (569.9 mAh g −1 with an initial coulombic efficiency of 57.57%) at 0.1 A g −1 and outstanding cycling performance (507 mAh g −1 after 50 cycles). This work provides a new strategy for preparing high performance cathode materials for RT Na-S battery.
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MOLECULES
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2022
·Vol. 27
·期 15
·4673
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IF 4.927
Yanru Liu,Jingyun Mao,Yiwei Huang,Qingrong Qian,Yongjin Luo,Hun Xue,Songwei Yang
The Pt-chitosan-TiO2charge transfer (CT) complex was synthesized via the sol-gel and impregnation method. The synthesized photocatalysts were thoroughly characterized, and their photocatalytic activity were evaluated toward H2production through water reduction under visible-light irradiation. The effect of the preparation conditions of the photocatalysts (the degree of deacetylation of chitosan, addition amount of chitosan, and calcination temperature) on the photocatalytic activity was discussed. The optimal Pt-10%DD75-T200 showed a H2generation rate of 280.4 μmol within 3 h. The remarkable visible-light photocatalytic activity of Pt-chitosan-TiO2was due to the CT complex formation between chitosan and TiO2, which extended the visible-light absorption and induced the ligand-to-metal charge transfer (LMCT). The photocatalytic mechanism of Pt-chitosan-TiO2was also investigated. This paper outlines a new and facile pathway for designing novel visible-light-driven photocatalysts that are based on TiO2modified by polysaccharide biomass wastes that are widely found in nature.Keywords:photocatalyst;TiO2;chitosan;H2evolution;LMCT;visible light
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Molecular Catalysis
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2022
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IF 5.089
Xiaoda Niu,Shuang Liu,Yong Men,Lin Li,Liangmin Xiong,Kailiang Guo,Junzhe Xu,Kunfeng Zhao,Ya Li,Wei An,Jinguo Wang
Hydrogenation of quinones is an efficient way to produce hydroquinone compounds. Typically, 2,3,5-trimethylhydroquinone (TMHQ), the key intermediate of vitamin E, can be produced via hydrogenation of 2,3,5-trimethylbenzoquinone (TMBQ). In order to effectively obtain the target products, the exploration of efficient heterogeneous catalysts is highly desired. In this study, supported Pd nanocluster catalysts (PdN/TiVo) were designed through a deposition-precipitation method over TiO 2 support with surface defects (TiVo) to achieve high atomic utilization efficiency of the noble metal Pd under mild reaction conditions. The characterization showed that oxygen vacancies generated by H 2 reduction on the support TiO 2 acted as specific sites to promote the formation of the coupled eutectic growth structure composed of the active metal Pd and TiVo. The active metal Pd which not only exhibited high dispersion but also formed electron-rich active sites can activate H 2 while the Ti 3+ atoms at oxygen vacancy sites can adsorb the oxygen species from TMBQ, thereby a synergistic catalytic effect can be shown to enhance the adsorption and hydrogenation of C=O bonds. Thus PdN/TiVo revealed a high yield of TMHQ of 96% and TOF of 276 min −1 under a considerably wild condition (45°C, 0.2 MPa, 60 min). By comparison, state-of-the-art carbon based Pd catalysts (PdN/C) acquired only 29% yield and 41 min −1 TOF in the same way. The simultaneous engineering of Pd catalyst and oxygen vacancies on TiO 2 offers a new strategy to develop efficient heterogeneous catalysts for hydrogenation of quinones.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Dan Zhao,Xianfa Zhang,Wenjing Wang,Lili Sui,Chuanyu Guo,Yingming Xu,Xin Zhou,Xiaoli Cheng,Shan Gao,Lihua Huo
Real-time detection of herbicides has been a challenge for the application of metal oxide gas sensors. In this paper, we report the application of TiO 2 sensors with oxygen vacancies for the detection of isopropylamine . Spherical structure with oxygen vacancies was successfully prepared by a simple one-step hydrothermal method combined with ionic liquid as morphology regulator. The morphology and structure of the materials were analyzed using XRD, SEM and TEM. Further studies reveal that the oxygen vacancies in this material play an important role in the detection of isopropylamine. The sensor exhibits excellent selectivity, moisture resistance and long-term stability. The response is 61.7–100 ppm isopropylamine, along with fast response time of 22 s. It is noteworthy that the lower limit of detection for isopropylamine can reach 0.2 ppm, which is very meaningful to practical application of detecting gas residues. The excellent performance can primarily be attributed to the formation of abundant oxygen vacancies into the material, which increases the adsorption capacity of gas molecules. This new sensing design strategy offers a vital reference to extend the application of non-metallic elements doped metal oxide semiconductors .
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Dongwei Feng,Peng Huang,Yunfei Miao,Axin Liang,Xuan Wang,Bo Tang,Huipeng Hou,Mingxing Ren,Shimeng Gao,Lina Geng,Aiqin Luo
Developing cost-effective, ease-to-use and sensitive cholesterol sensors is of great importance. Photoelectrochemical (PEC) sensor has exhibited their potential with low cost, simple instrumentation, easy miniaturization, and high sensitivity. Organometal lead halide perovskites (MAPbX 3 ) with exceptional opto-electronic properties have been appealing materials for optoelectronic devices. Whereas the extreme sensitivity of MAPbX 3 towards even moisture has always restricted their application in biological use. Here we report a novel MAPbX 3 photoelectrochemical cholesterol sensor with water stability. The titanium dioxide inverse opal (TiO 2 IOPCs) and CH 3 NH 3 PbBr 3 quantum dot heterojunction on ITO glass exhibited a remarkably increased photoelectric current density of approximately 40 μA/cm 2 . The further encapsulation within the imprinted polymer presented high selectivity towards cholesterol and significantly improved the stability of perovskites as well. Linear detection of cholesterol in buffer was achieved with the detection limit of 2.51 × 10 - 10 mol/L, lower than that of the reported cholesterol PEC sensor in aqueous buffer. Recovery rates in serum were also obtained with the cholesterol concentration lower than the reported imprinted polymer based (photo)electrochemical sensor. Additionally, the photocurrent intensity under continuous emission was maintained at 80% after immersing this sensor in an aqueous solution for 500 s. The storage stability was more than 20 days. Here we present the first MAPbX3 perovskite-based sensor applicable in aqueous samples with super sensitivity and selectivity, which promote the perovskite nanomaterial-mediated sensing of biologically important species.
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FUEL
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2022
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IF 8.035
Yiqing Zeng,Weilong Rong,Shule Zhang,Yanan Wang,Qin Zhong
Ammonia selective catalytic reduction (NH 3 -SCR) technique for nitrogen oxide (NO x ) elimination of low temperature flue gas (<200 °C) requires huge energy consumption and operation costs. In this work, a CuO modified V 2 O 5 -WO 3 /TiO 2 (Cu/VWTi) catalyst are constructed to achieve the aim of enhancing the temperature of flue gas via using the heat released by CO oxidation, thereby promoting the NH 3 -SCR of NO x reaction. Benefiting from the synergistic effect between CuO and VWTi in the adsorption and activation of reactants, Cu/VWTi catalyst shows high NO x (>90%) and CO (>90%) removal efficiency at the temperature range of 225–270 °C and a GHSV of 40,000 h −1 . Moreover, it is found that the completely oxidation of 2000 ppm CO can increase the flue gas temperature by about 20 °C. Therefore, developing catalyst that can achieve simultaneously NH 3 -SCR of NO x and CO oxidation is a feasible method to deduce the energy consumption and operation costs of NH 3 -SCR of NO x system in low temperature flue gas. Finally, the reaction process and SO 2 deactivation effect over Cu/VWTi catalyst was studied via in-situ DRIFT. This work might provide some guidance for the design of catalysts to eliminate multiple pollutants.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
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IF 6.76
Hongyu Zhang,Ling Chen,Baogang Xu,Ping Yang
The strong band-to-band visible light absorption obtained by changing the bandgap of photocatalysts is desirable but challenging for TiO 2 . In this paper, a mechanochemical pre-reaction and subsequent heat-treatment process were used to create TiO 2 /g-C 3 N 4 heterojunctions. Acid-treated H 2 Ti 3 O 7 nanobelts and superior thin g-C 3 N 4 nanosheets (CN) were ground evenly and further heat-treated to grow rhombic TiO 2 in situ on the nanosheets. The heterojunctions exhibited a band gap with the absorption in visible light region. Heterojunction formation effective tunes the surface and electronic structures of the composite, resulting in significant decrease of bandgap. g-C 3 N 4 -based heterojunctions (5TCN) exhibited excellent H 2 generation (4991 μmol/g/h) and NO removal. In contrast, a TiO 2 -based composite (95TCN) revealed efficient photo reduction of Cr(Ⅵ) which was 2 times of that of TiO 2 sample and 22 times of that of CN. The photochemical reaction mechanism of TiO 2 and g-C 3 N 4 -based composites was discussed with the ratio of TiO 2 and g-C 3 N 4 . The excellent performance is ascribed to single crystal rhombic TiO 2 nanoparticles grown in situ on g-C 3 N 4 to form well-developed heterojunctions which accelerate the carrier transfer. These results inspire the electronic structure engineering of photocatalysts to improve visible light absorption and provide a magic strategy for excellent photochemical activities.
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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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RSC Advances
·
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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