APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Fangya Qi,Lianyi Shao,Xiaoyi Lu,Guoping Liu,Xiaoyan Shi,Zhipeng Sun
Establishing heterostructure is an effective strategy to improve the cycling and rate properties of electrode due to high charge transfer kinetics. Nevertheless, it is still a great challenge to prepare a reasonable heterojunction material with appropriate electrochemical property as anode for Na/K ion batteries. In this work, a novel MXene derivative consisted of TiSe 2 /TiO 2 /C heterostructured hexagonal prism has been prepared by a simple solid phase sintering method to converting Ti 3 C 2 T x MXene to TiSe 2 /TiO 2 /C. In this composite, TiSe 2 and TiO 2 with different work functions can induce a built-in electric field in the heterojunction interface, accelerating the electrochemical courses. Serving as an anode material for Na ion batteries , TiSe 2 /TiO 2 /C can keep a discharge capacity of 280 mAh g −1 at 5 A g −1 after 1000 cycles and a superior rate capability with 212 mAh g −1 even at 10 A g −1 . Even using as anode for K ion batteries , TiSe 2 /TiO 2 /C can still retain a capacity of 121 mAh g −1 at 0.1 A g −1 after 800 cycles. This work supplies a simple approach to design metal oxide/selenide heterostructures toward Na/K ion batteries with excellent performance and promotes the application of MXene derivatives in the field of energy storage.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
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IF 3.898
Yaoyao Peng,Lei Song,Siru Lu,Ziyu Su,Kui Ma,Siyang Tang,Shan Zhong,Hairong Yue,Bin Liang
The significant decrease of acid sites caused by alkali metal poisoning is the major factor in the deactivation of commercial V 2 O 5 -WO 3 /TiO 2 NH 3 -SCR catalysts. In this work, the solid superacid SO 4 2− -TiO 2 modified by sulfate radicals, was selected as the catalyst support, which showed superior potassium resistance. The physicochemical properties and K-poisoning resistance of the V 2 O 5 -WO 3 /SO 4 2− -TiO 2 (VWSTi) catalyst were carried out by XRD, BET, H 2 -TPR, NH 3 -TPD, XPS, in situ DRIFTS and TG. The results pointed out that the introduction of SO 4 2− significantly increased the NH 3 -SCR catalytic activity at high temperatures, with an exceptionally high NO x conversion over 90% between 275 °C and 500 °C. When 0.5% (mass) K 2 O was doped on the catalysts, the catalytic performance of the traditional V 2 O 5 -WO 3 /TiO 2 (VWTi) catalyst decreased significantly, while the VWSTi catalyst could still maintain a NO x conversion over 90% in the range of 300–500 °C. The characterizations suggested that the support of SO 4 2− -TiO 2 greatly increased the number of acidic sites, thereby enhancing the adsorption capacity of the reactant NH 3 . The results above demonstrated a potential approach to achieve superior potassium resistance for NH 3 -SCR catalysts using solid superacid.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Fang Yuan,Renfeng Yang,Chunquan Li,Xiangwei Zhang,Zhiming Sun
How to improve the photocatalytic performance of titania-based photocatalyst under visible light in environmental remediation remains a challenge. Herein, three kinds of bismuth semiconductors, including Bi 2 MoO 6 , BiOCl and BiVO 4 , are selected to construct heterojunctions with diatomite supporting titania for improving photocatalytic performance towards formaldehyde (HCHO) under visible light. The morphologies and microstructures as well as the photocatalytic performance of the as-received samples are systematically investigated for comparation. The Bi 2 MoO 6 -TiO 2 /diatomite (MTD-50) composite has the optimal performance, followed by BiOCl-TiO 2 /diatomite (CTD-100) composite and BiVO 4 -TiO 2 /diatomite (VTD-75) composite, whose mineralization rate is up to around 47.58 times, 29.55 times and 21.14 times that of TiO 2 /diatomite (TD) composite, respectively. Moreover, the performance enhancement mechanism could be attributed to their relatively high quantum efficiency that originated from the heterojunctions, resulting in the high generation efficiency of active radicals. This work would like to compare bismuth semiconductor photocatalysts for enhancing visible-light properties through heterojunction and provide comparative references for developing novel visible light driven photocatalysts in the field of indoor HCHO purification.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Yi Yang,Bicheng Zhu,Libo Wang,Bei Cheng,Liuyang Zhang,Jiaguo Yu
Artificial photosynthesis offers a promising strategy for converting solar energy into environmental-friendly H 2 O 2 . Herein, robust photocatalytic H 2 O 2 production through dioxygen reduction is achieved, reaching a high H 2 O 2 yield of 873 μmol L −1 h −1 . The photocatalyst was prepared by in-situ chemical vapor deposition of N, S co-doped graphene on TiO 2 nanofibers. Thanks to the intimate interface with large area and Schottky junction, the H 2 O 2 yield of the composite can be increased by eight times than that of pristine TiO 2 . Experimental results and density functional theory calculations clarify that the strong synergistic effect between the doped N and S atoms provides abundant active sites to facilitate the electron transfer, promote the adsorption of O 2 molecules, and restrain the decomposition of formed H 2 O 2 by suppressing H 2 O 2 adsorption. This work not only provides a novel approach to build close contact between photocatalyst and co-catalyst, but also develops a highly efficient photocatalyst for H 2 O 2 production.
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ELECTROCHIMICA ACTA
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2022
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IF 7.336
Cuilin Meng,Qiongfang Zhuo,Anqi Wang,Jingjing Liu,Zehong Yang,Junfeng Niu
In this study, TiO 2 nanotube arrays (TiO 2 -NTA) were used as an intermediate layer to provide effective electrocatalytic activity and stability for Ti/TiO 2 -NTA/Ti 4 O 7 anode. Compared with Ti/Ti 4 O 7 anode, Ti/TiO 2 -NTA/Ti 4 O 7 anode exhibited higher oxygen evolution potential (2.40 V), larger active specific surface areas (1.81 m 2 g −1 ), stronger radical generation capacity (64.42 μM), longer accelerated service life (56.0 h), and superior favipiravir removal ratio. The flow-through electrochemical reaction system was constructed by using the porous Ti/TiO 2 -NTA/Ti 4 O 7 anode. The removal ratio, TOC removal ratio and mineralization current efficiency of favipiravir in the flow-by electrochemical system were significantly improved and the energy consumption was reduced compared with the conventional flow-by electrochemical system, verifying the superiority of the porous flow-through Ti/TiO 2 -NTA/Ti 4 O 7 anode. The effects of operating parameters on the removal of favipiravir in the flow-through electrochemical reaction system were investigated. The degradation mechanisms of favipiravir are the synergetic effects of the free radical (·OH and SO 4 − ·) and the direct electron transfer. Ti/TiO 2 -NTA/Ti 4 O 7 anode displayed excellent stability in five consecutive cycles, exhibited significant removal ratio (87.7%) of favipiravir from actual wastewater, and remained efficient and versatile for a wide range of typical PPCPs pollutants. Therefore, Ti/TiO 2 -NTA/Ti 4 O 7 is a promising porous anode material in the engineering application.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yuqing Lu,Chunsheng Ding,Jun Guo,Wei Gan,Peng Chen,Miao Zhang,Zhaoqi Sun
There is a high demand for photocatalysts that can efficiently degrade antibiotics; however, there are challenges in technological development related to charge transfer and light capture ability. In this study, ternary Bi 2 MoO 6 /GQDs/TiO 2 (denoted as BGT; GQDs refer to graphene quantum dots) heterojunction photocatalysts with high ciprofloxacin (CIP) photodegradation efficiency were successfully prepared. BGT with a 0.20 mL GQD dispersion solution (BGT-2) exhibited the highest CIP photodegradation efficiency (90.21 %). The rate constant of BGT-2 was 15.49 × 10 −3 min −1 , which was 4.01, 4.16, and 9.22 times higher than those of Bi 2 MoO 6 /TiO 2 (3.86 × 10 −3 min −1 ), Bi 2 MoO 6 (3.72 × 10 −3 min −1 ), and TiO 2 (1.68 × 10 −3 min −1 ), respectively. The degradation efficiencies of amoxicillin and tetracycline hydrochloride were 78.98 % and 92.49 %, respectively. The effects of pH values, water sources, and inorganic anions on CIP degradation were systematically explored. In addition, three environmentally friendly degradation pathways were proposed based on liquid chromatography-mass spectrometry (LC-MS) results and the toxicity evaluation of the various intermediates. Testing the optical and electrochemical properties of the catalysts showed that the synthesized dual Z-scheme heterojunctions can significantly improve the light capture ability and reduce the photogenerated electron-hole recombination rate, effectively addressing the challenges encountered with the use of photocatalysts.
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Surfaces and Interfaces
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2022
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IF 6.137
Iltaf Khan,Aihua Yuan,Aftab Khan,Shoaib Khan,Sohail Khan,Sayyar Ali Shah,Waleed Yaseen,Yanjuan Cui,Xiaoping Shen,Xuyu Wang
In this novel research work, Cr 3+ incorporated and TiO 2 -modified porous SmFeO 3 -based nanocomposites are prepared via utilizing carbon nanosphere (CNS) as a hard template. Our experimental results proved that the introduction of porosity by employing a sequential template approach (STA) has upgraded the performances of SmFeO 3 nanoparticles. Remarkably, the incorporation of Cr 3+ increased the light absorption capability by generating surface states and regulating band gap positions, whereas the fabrication of TiO 2 enlarged surface area and enhanced charge separation by modulating high-level energy electrons (HLEEs). According to our experimental techniques, including TEM, HRTEM, SEM, TGA, BET, PEC, FS, and PL, it is demonstrated that most optimal 6Cr-PSFO and 4TiO 2 /6Cr-PSFO nanocomposites have high porosity, appropriate bandgap positions, large surface area, and show superior visible-light photocatalytic activities compared to pristine SmFeO 3 nanoparticles. Compared to pristine SFO, the activities of most active 4TiO 2 /6Cr-PSFO nanocomposites are improved by 8-fold for CO 2 conversion and 3-times for 4-chlorophenol (4-CP) degradation. The radical trapping experiment confirmed that the · OH i are the most active species and has a vital role in the photocatalytic degradation of 4-CP. Moreover, our experimental results are verified and consistent with theoretical calculations and computational studies. Finally, our research work will open up a new gateway for the designing of novel porous SmFeO 3 -based nanocomposites and their use in CO 2 conversion and pollutant removal.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Haochen Zhang,Zhuoyu Li,Xiaoqun Zhou,Xiaohui Lu,Haiteng Gu,Jun Ma
The UV/chlorine (UC) system is a homogeneous advanced oxidation process with increasing attention in water decontamination . The addition of TiO 2 is a newly found strategy to enhance the generation of hydroxyl radical (HO • ) and chlorine radical (Cl • ) in the UC system. However, the crucial role of chlorine oxide radical (ClO • , generated by the reactions of HO • and Cl • with chlorine) on pollutant degradation , has not been noticed in UV/chlorine/TiO 2 (UCT), the heterogeneous photocatalytic system for chlorine activation. Herein, the role of ClO • in UCT was clarified through quenching experiments combined with model simulations during carbamazepine degradation. Tert -butyl alcohol completely inhibited while bicarbonate only partly suppressed carbamazepine degradation in UCT, indicating the important role of ClO • . The second-order reaction rate constant between ClO • and carbamazepine ( k ClO•,carbamazepine ) was fitted to be (1.21 ± 0.08) × 10 7 M −1 s −1 by the kinetic model, which avoided the influence of carbonate radical (CO 3 •− ), whose contribution couldn't be excluded during k ClO•,carbamazepine determination in commonly used competitive kinetic methods with bicarbonate. With the obtained k ClO•,carbamazepine , model simulation suggested that ClO • contributed about 50 % to carbamazepine degradation in UCT, and its concentration was less affected under varied conditions (solution pH, chlorine, bicarbonate, and chloride concentration) to keep an efficient carbamazepine degradation. On the contrary, pollutant degradation dominated by HO • in UCT was largely inhibited with the increase of pH, chlorine, and bicarbonate concentration. In addition to the promotion of degradation efficiency, less disinfection byproducts and lower energy requirement were found in UCT compared with UC. Furthermore, UCT could maintain satisfactory degradation efficiency and energy saving in ground water and surface water samples. Results of this study unraveled the crucial role of ClO • for pollutant degradation in UCT, and showed bright prospects and great potentials of the system in water treatment .
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PubMed
高影响因子
GREEN CHEMISTRY
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2021
·Vol. 23
·期 24
·10039-10049
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IF 10.182
Yingying Cao,Dandan Chen,Ye Meng,Shunmugavel Saravanamurugan,Hu Li
Chemocatalytic production of lactic acid from biomass feedstock is an alternative route with high potential, but with the prerequisites of long reaction time, high temperature, and/or a tailored catalyst. In this work, an N-TiO2 photothermal catalyst prepared by a simple sol–gel method using urea as a nitrogen and carbon source could catalyse a variety of biomass sugars to quantitatively produce lactic acid (up to 98.9% yield) in water under visible light and at a low temperature of 60 °C in a time as short as 30 min. N-TiO2 provides a suitable valence band position (2.51 eV) for the photo-oxidation reaction, with more active species being formed on the catalyst surface (e.g., h+, e−, ˙OH and ˙O2) and a light-induced heating effect caused by the carbon photothermal layer, which can effectively activate carbohydrates to undergo a cascade reaction process. Theoretical calculations show that the charge of N-TiO2 is highly separated, in which the N element acts as an electron trap and is enriched with plenty of electrons, leading to effective isolation of holes and electrons. In addition, the N-TiO2 catalyst exhibits good reusability and can be recycled with little loss of activity. The developed N and C-enhanced photothermal synergistic protocol opens up an avenue for producing organic acids from renewable biomass resources under mild conditions.
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Journal of Nanostructure in Chemistry
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2021
·Vol. 12
·期 6
·1075-1087
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IF 6.391
Wang Junlei,Wang Kuan,He Zhen-Hong,Li Song-Song,Zhang Rong-Rong,Guo Pengfei,Wang Weitao,Yang Yang,Liu Zhao-Tie
A solvothermal route was developed to synthesize hierarchical TiO 2 nanoflowers with tunable morphology, macroporous and mesoporous structure, and larger surface areas by varying the ratio of N , N -dimethylformamide to isopropyl alcohol without using surfactant and template. Morphology and microstructure, textural, crystalline, optical and photoelectric properties were characterized to investigate thoroughly the correlation of features and photoactivity of catalysts. The photoactivity was evaluated for the degradation of phenol through analyzing the phenolic compounds. The catalysts exhibited significantly high photocatalytic activity with the degradation rate of phenol of 95%, and the decrease of total organic carbon (TOC) was 82 ± 3% under ultraviolet radiation (UV) for 180 min at room temperature. Meanwhile, the excellent cyclic stability and regenerability were obtained during five cycles and continued illumination. The enhanced photocatalytic activity probably was attributed to larger surface areas, hierarchical porous structure, effective generation and separation of the charge carriers, and outstanding light-harvesting ability.
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APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Chuanxin Yu,Mingxia Li,Decai Yang,Kai Pan,Fan Yang,Yachao Xu,Lang Yuan,Yang Qu,Wei Zhou
The low charge separation efficiency of semiconductor photocatalyst is still a stumbling block to improve photocatalytic performance. The p-n heterojunction with built-in electric field usually favors the spatial charge separation. Herein, NiO nanoparticles dotted TiO 2 nanotubes p-n heterojunction photocatalysts (NiO/TNs) are fabricated through hydrothermal and wet-impregnation strategies. The resultant NiO/TNs with relatively large surface area of 102.8 m 2 g −1 shows excellent photocatalytic H 2 production rate of 228 μmol h −1 g −1 , which are four times higher than that of TNs (50 μmol h −1 g −1 ) under AM 1.5G irradiation without any cocatalyst. The high photocatalytic activity can be ascribed to the uniform growth NiO nanoparticles on surface of TNs enhancing the photoresponse to visible light region, and the formation of p-n heterojunctions induced built-in electric field promoting photogenerated electrons transmission from NiO to TNs through the heterogeneous interface, thus enhanced the charge carriers migration and separation efficiently.
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Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Yanhua Cui,Jian Zheng,Zengkai Wang,Binrong Li,Yongsheng Yan,Minjia Meng
How to endow the photocatalytic membrane with excellent efficiency and high permeability has always troubled scientific researchers. Herein, this work proposed an alternative strategy to controllably induce magnetic core-shell structured Fe 3 O 4 @TiO 2 nanoparticles to move towards the membrane surface under magnetic field, significantly maintaining a high-water flow rate and enhancing the photocatalytic degradation efficiency. The presence of Fe 3 O 4 in Fe 3 O 4 @TiO 2 facilitates the electron-hole separation efficiency and maintains the high redox ability of photogenerated electrons in TiO 2 . The characterization results indicated the Fe 3 O 4 @TiO 2 nanoparticles were successfully migrated to the membrane surface. As expected, the FTM(Y) had higher porosity (85.56%), higher pure water flux (1536.47 L m −2 h −1 bar −1 ) and better antifouling performance (5.24% of BSA static adsorption) than that of FTM(N) (1054.26 L m −2 h −1 bar −1 , 6.62%). Meanwhile, the FTM(Y) exhibited excellent photocatalytic and self-cleaning activity, the FTM(Y) showed 1.3 times enhancement in visible light (λ > 420 nm) driven photocatalytic degradation efficiency of tetracycline compared to that of the FTM(N) without magnetically induced. The ·O 2 - and·OH radicals and photogenerated h + played the primary role in photocatalytic degradation process. This work provides new insight into the design of highly efficient photocatalytic membrane to treat wastewater and enhance water purification .
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